Treant.js

/*
 * Treant-js
 *
 * (c) 2013 Fran Peručić
 * Treant-js may be freely distributed under the MIT license.
 * For all details and documentation:
 * http://fperucic.github.io/treant-js
 *
 * Treant is an open-source JavaScipt library for visualization of tree diagrams.
 * It implements the node positioning algorithm of John Q. Walker II "Positioning nodes for General Trees".
 *
 * References:
 * Emilio Cortegoso Lobato: ECOTree.js v1.0 (October 26th, 2006)
 *
 * Contributors:
 * Fran Peručić, https://github.com/fperucic
 * Dave Goodchild, https://github.com/dlgoodchild
 */

;( function( exports ) {
    // Polyfill for IE to use startsWith
    if (!String.prototype.startsWith) {
        String.prototype.startsWith = function(searchString, position){
            return this.substr(position || 0, searchString.length) === searchString;
        };
    }

    var $ = null;

    var UTIL = {

        /**
         * Directly updates, recursively/deeply, the first object with all properties in the second object
         * @param {object} applyTo
         * @param {object} applyFrom
         * @return {object}
         */
        inheritAttrs: function( applyTo, applyFrom ) {
            for ( var attr in applyFrom ) {
                if ( applyFrom.hasOwnProperty( attr ) ) {
                    if ( ( applyTo[attr] instanceof Object && applyFrom[attr] instanceof Object ) && ( typeof applyFrom[attr] !== 'function' ) ) {
                        this.inheritAttrs( applyTo[attr], applyFrom[attr] );
                    }
                    else {
                        applyTo[attr] = applyFrom[attr];
                    }
                }
            }
            return applyTo;
        },

        /**
         * Returns a new object by merging the two supplied objects
         * @param {object} obj1
         * @param {object} obj2
         * @returns {object}
         */
        createMerge: function( obj1, obj2 ) {
            var newObj = {};
            if ( obj1 ) {
                this.inheritAttrs( newObj, this.cloneObj( obj1 ) );
            }
            if ( obj2 ) {
                this.inheritAttrs( newObj, obj2 );
            }
            return newObj;
        },

        /**
         * Takes any number of arguments
         * @returns {*}
         */
        extend: function() {
            if ( $ ) {
                Array.prototype.unshift.apply( arguments, [true, {}] );
                return $.extend.apply( $, arguments );
            }
            else {
                return UTIL.createMerge.apply( this, arguments );
            }
        },

        /**
         * @param {object} obj
         * @returns {*}
         */
        cloneObj: function ( obj ) {
            if ( Object( obj ) !== obj ) {
                return obj;
            }
            var res = new obj.constructor();
            for ( var key in obj ) {
                if ( obj.hasOwnProperty(key) ) {
                    res[key] = this.cloneObj(obj[key]);
                }
            }
            return res;
        },

        /**
         * @param {Element} el
         * @param {string} eventType
         * @param {function} handler
         */
        addEvent: function( el, eventType, handler ) {
            if ( $ ) {
                $( el ).on( eventType+'.treant', handler );
            }
            else if ( el.addEventListener ) { // DOM Level 2 browsers
                el.addEventListener( eventType, handler, false );
            }
            else if ( el.attachEvent ) { // IE <= 8
                el.attachEvent( 'on' + eventType, handler );
            }
            else { // ancient browsers
                el['on' + eventType] = handler;
            }
        },

        /**
         * @param {string} selector
         * @param {boolean} raw
         * @param {Element} parentEl
         * @returns {Element|jQuery}
         */
        findEl: function( selector, raw, parentEl ) {
            parentEl = parentEl || document;

            if ( $ ) {
                var $element = $( selector, parentEl );
                return ( raw? $element.get( 0 ): $element );
            }
            else {
                // todo: getElementsByName()
                // todo: getElementsByTagName()
                // todo: getElementsByTagNameNS()
                if ( selector.charAt( 0 ) === '#' ) {
                    return parentEl.getElementById( selector.substring( 1 ) );
                }
                else if ( selector.charAt( 0 ) === '.' ) {
                    var oElements = parentEl.getElementsByClassName( selector.substring( 1 ) );
                    return ( oElements.length? oElements[0]: null );
                }

                throw new Error( 'Unknown container element' );
            }
        },

        getOuterHeight: function( element ) {
            var nRoundingCompensation = 1;
            if ( typeof element.getBoundingClientRect === 'function' ) {
                return element.getBoundingClientRect().height;
            }
            else if ( $ ) {
                return Math.ceil( $( element ).outerHeight() ) + nRoundingCompensation;
            }
            else {
                return Math.ceil(
                    element.clientHeight
                    + UTIL.getStyle( element, 'border-top-width', true )
                    + UTIL.getStyle( element, 'border-bottom-width', true )
                    + UTIL.getStyle( element, 'padding-top', true )
                    + UTIL.getStyle( element, 'padding-bottom', true )
                    + nRoundingCompensation
                );
            }
        },

        getOuterWidth: function( element ) {
            var nRoundingCompensation = 1;
            if ( typeof element.getBoundingClientRect === 'function' ) {
                return element.getBoundingClientRect().width;
            }
            else if ( $ ) {
                return Math.ceil( $( element ).outerWidth() ) + nRoundingCompensation;
            }
            else {
                return Math.ceil(
                    element.clientWidth
                    + UTIL.getStyle( element, 'border-left-width', true )
                    + UTIL.getStyle( element, 'border-right-width', true )
                    + UTIL.getStyle( element, 'padding-left', true )
                    + UTIL.getStyle( element, 'padding-right', true )
                    + nRoundingCompensation
                );
            }
        },

        getStyle: function( element, strCssRule, asInt ) {
            var strValue = "";
            if ( document.defaultView && document.defaultView.getComputedStyle ) {
                strValue = document.defaultView.getComputedStyle( element, '' ).getPropertyValue( strCssRule );
            }
            else if( element.currentStyle ) {
                strCssRule = strCssRule.replace(/\-(\w)/g,
                    function (strMatch, p1){
                        return p1.toUpperCase();
                    }
                );
                strValue = element.currentStyle[strCssRule];
            }
            //Number(elem.style.width.replace(/[^\d\.\-]/g, ''));
            return ( asInt? parseFloat( strValue ): strValue );
        },

        addClass: function( element, cssClass ) {
            if ( $ ) {
                $( element ).addClass( cssClass );
            }
            else {
                if ( !UTIL.hasClass( element, cssClass ) ) {
                    if ( element.classList ) {
                        element.classList.add( cssClass );
                    }
                    else {
                        element.className += " "+cssClass;
                    }
                }
            }
        },

        hasClass: function(element, my_class) {
            return (" " + element.className + " ").replace(/[\n\t]/g, " ").indexOf(" "+my_class+" ") > -1;
        },

        toggleClass: function ( element, cls, apply ) {
            if ( $ ) {
                $( element ).toggleClass( cls, apply );
            }
            else {
                if ( apply ) {
                    //element.className += " "+cls;
                    element.classList.add( cls );
                }
                else {
                    element.classList.remove( cls );
                }
            }
        },

        setDimensions: function( element, width, height ) {
            if ( $ ) {
                $( element ).width( width ).height( height );
            }
            else {
                element.style.width = width+'px';
                element.style.height = height+'px';
            }
        },
        isjQueryAvailable: function() {return(typeof ($) !== 'undefined' && $);},
    };

    /**
     * ImageLoader is used for determining if all the images from the Tree are loaded.
     * Node size (width, height) can be correctly determined only when all inner images are loaded
     */
    var ImageLoader = function() {
        this.reset();
    };

    ImageLoader.prototype = {

        /**
         * @returns {ImageLoader}
         */
        reset: function() {
            this.loading = [];
            return this;
        },

        /**
         * @param {TreeNode} node
         * @returns {ImageLoader}
         */
        processNode: function( node ) {
            var aImages = node.nodeDOM.getElementsByTagName( 'img' );

            var i = aImages.length;
            while ( i-- ) {
                this.create( node, aImages[i] );
            }
            return this;
        },

        /**
         * @returns {ImageLoader}
         */
        removeAll: function( img_src ) {
            var i = this.loading.length;
            while ( i-- ) {
                if ( this.loading[i] === img_src ) {
                    this.loading.splice( i, 1 );
                }
            }
            return this;
        },

        /**
         * @param {TreeNode} node
         * @param {Element} image
         * @returns {*}
         */
        create: function ( node, image ) {
            var self = this, source = image.src;

            function imgTrigger() {
                self.removeAll( source );
                node.width = node.nodeDOM.offsetWidth;
                node.height = node.nodeDOM.offsetHeight;
            }

            if ( image.src.indexOf( 'data:' ) !== 0 ) {
                this.loading.push( source );

                if ( image.complete ) {
                    return imgTrigger();
                }

                UTIL.addEvent( image, 'load', imgTrigger );
                UTIL.addEvent( image, 'error', imgTrigger ); // handle broken url-s

                // load event is not fired for cached images, force the load event
                image.src += ( ( image.src.indexOf( '?' ) > 0)? '&': '?' ) + new Date().getTime();
            }
            else {
                imgTrigger();
            }
        },

        /**
         * @returns {boolean}
         */
        isNotLoading: function() {
            return ( this.loading.length === 0 );
        }
    };

    /**
     * Class: TreeStore
     * TreeStore is used for holding initialized Tree objects
     *  Its purpose is to avoid global variables and enable multiple Trees on the page.
     */
    var TreeStore = {

        store: [],

        /**
         * @param {object} jsonConfig
         * @returns {Tree}
         */
        createTree: function( jsonConfig ) {
            var nNewTreeId = this.store.length;
            this.store.push( new Tree( jsonConfig, nNewTreeId ) );
            return this.get( nNewTreeId );
        },

        /**
         * @param {number} treeId
         * @returns {Tree}
         */
        get: function ( treeId ) {
            return this.store[treeId];
        },

        /**
         * @param {number} treeId
         * @returns {TreeStore}
         */
        destroy: function( treeId ) {
            var tree = this.get( treeId );
            if ( tree ) {
                tree._R.remove();
                var draw_area = tree.drawArea;

                while ( draw_area.firstChild ) {
                    draw_area.removeChild( draw_area.firstChild );
                }

                var classes = draw_area.className.split(' '),
                    classes_to_stay = [];

                for ( var i = 0; i < classes.length; i++ ) {
                    var cls = classes[i];
                    if ( cls !== 'Treant' && cls !== 'Treant-loaded' ) {
                        classes_to_stay.push(cls);
                    }
                }
                draw_area.style.overflowY = '';
                draw_area.style.overflowX = '';
                draw_area.className = classes_to_stay.join(' ');

                this.store[treeId] = null;
            }
            return this;
        }
    };

    /**
     * Tree constructor.
     * @param {object} jsonConfig
     * @param {number} treeId
     * @constructor
     */
    var Tree = function (jsonConfig, treeId ) {

        /**
         * @param {object} jsonConfig
         * @param {number} treeId
         * @returns {Tree}
         */
        this.reset = function( jsonConfig, treeId ) {
            this.initJsonConfig = jsonConfig;
            this.initTreeId = treeId;

            this.id = treeId;

            this.CONFIG = UTIL.extend( Tree.CONFIG, jsonConfig.chart );
            this.drawArea = UTIL.findEl( this.CONFIG.container, true );
            if ( !this.drawArea ) {
                throw new Error( 'Failed to find element by selector "'+this.CONFIG.container+'"' );
            }

            UTIL.addClass( this.drawArea, 'Treant' );

            // kill of any child elements that may be there
            this.drawArea.innerHTML = '';

            this.imageLoader = new ImageLoader();

            this.nodeDB = new NodeDB( jsonConfig.nodeStructure, this );

            // key store for storing reference to node connectors,
            // key = nodeId where the connector ends
            this.connectionStore = {};

            this.loaded = false;

            this._R = new Raphael( this.drawArea, 100, 100 );

            return this;
        };

        /**
         * @returns {Tree}
         */
        this.reload = function() {
            this.reset( this.initJsonConfig, this.initTreeId ).redraw();
            return this;
        };

        this.reset( jsonConfig, treeId );
    };

    Tree.prototype = {

        /**
         * @returns {NodeDB}
         */
        getNodeDb: function() {
            return this.nodeDB;
        },

        /**
         * @param {TreeNode} parentTreeNode
         * @param {object} nodeDefinition
         * @returns {TreeNode}
         */
        addNode: function( parentTreeNode, nodeDefinition ) {
            var dbEntry = this.nodeDB.get( parentTreeNode.id );

            this.CONFIG.callback.onBeforeAddNode.apply( this, [parentTreeNode, nodeDefinition] );

            var oNewNode = this.nodeDB.createNode( nodeDefinition, parentTreeNode.id, this );
            oNewNode.createGeometry( this );

            oNewNode.parent().createSwitchGeometry( this );

            this.positionTree();

            this.CONFIG.callback.onAfterAddNode.apply( this, [oNewNode, parentTreeNode, nodeDefinition] );

            return oNewNode;
        },

        /**
         * @returns {Tree}
         */
        redraw: function() {
            this.positionTree();
            return this;
        },

        /**
         * @param {function} callback
         * @returns {Tree}
         */
        positionTree: function( callback ) {
            var self = this;

            if ( this.imageLoader.isNotLoading() ) {
                var root = this.root(),
                    orient = this.CONFIG.rootOrientation;

                this.resetLevelData();

                this.firstWalk( root, 0 );
                this.secondWalk( root, 0, 0, 0 );

                this.positionNodes();

                if ( this.CONFIG.animateOnInit ) {
                    setTimeout(
                        function() {
                            root.toggleCollapse();
                        },
                        this.CONFIG.animateOnInitDelay
                    );
                }

                if ( !this.loaded ) {
                    UTIL.addClass( this.drawArea, 'Treant-loaded' ); // nodes are hidden until .loaded class is added
                    if ( Object.prototype.toString.call( callback ) === "[object Function]" ) {
                        callback( self );
                    }
                    self.CONFIG.callback.onTreeLoaded.apply( self, [root] );
                    this.loaded = true;
                }

            }
            else {
                setTimeout(
                    function() {
                        self.positionTree( callback );
                    }, 10
                );
            }
            return this;
        },

        /**
         * In a first post-order walk, every node of the tree is assigned a preliminary
         * x-coordinate (held in field node->prelim).
         * In addition, internal nodes are given modifiers, which will be used to move their
         * children to the right (held in field node->modifier).
         * @param {TreeNode} node
         * @param {number} level
         * @returns {Tree}
         */
        firstWalk: function( node, level ) {
            node.prelim = null;
            node.modifier = null;

            this.setNeighbors( node, level );
            this.calcLevelDim( node, level );

            var leftSibling = node.leftSibling();

            if ( node.childrenCount() === 0 || level == this.CONFIG.maxDepth ) {
                // set preliminary x-coordinate
                if ( leftSibling ) {
                    node.prelim = leftSibling.prelim + leftSibling.size() + this.CONFIG.siblingSeparation;
                }
                else {
                    node.prelim = 0;
                }
            }
            else {
                //node is not a leaf,  firstWalk for each child
                for ( var i = 0, n = node.childrenCount(); i < n; i++ ) {
                    this.firstWalk(node.childAt(i), level + 1);
                }

                var midPoint = node.childrenCenter() - node.size() / 2;

                if ( leftSibling ) {
                    node.prelim = leftSibling.prelim + leftSibling.size() + this.CONFIG.siblingSeparation;
                    node.modifier = node.prelim - midPoint;
                    this.apportion( node, level );
                }
                else {
                    node.prelim = midPoint;
                }

                // handle stacked children positioning
                if ( node.stackParent ) { // handle the parent of stacked children
                    node.modifier += this.nodeDB.get( node.stackChildren[0] ).size()/2 + node.connStyle.stackIndent;
                }
                else if ( node.stackParentId ) { // handle stacked children
                    node.prelim = 0;
                }
            }
            return this;
        },

        /*
         * Clean up the positioning of small sibling subtrees.
         * Subtrees of a node are formed independently and
         * placed as close together as possible. By requiring
         * that the subtrees be rigid at the time they are put
         * together, we avoid the undesirable effects that can
         * accrue from positioning nodes rather than subtrees.
         */
        apportion: function (node, level) {
            var firstChild              = node.firstChild(),
                firstChildLeftNeighbor  = firstChild.leftNeighbor(),
                compareDepth            = 1,
                depthToStop             = this.CONFIG.maxDepth - level;

            while( firstChild && firstChildLeftNeighbor && compareDepth <= depthToStop ) {
                // calculate the position of the firstChild, according to the position of firstChildLeftNeighbor

                var modifierSumRight    = 0,
                    modifierSumLeft     = 0,
                    leftAncestor        = firstChildLeftNeighbor,
                    rightAncestor       = firstChild;

                for ( var i = 0; i < compareDepth; i++ ) {
                    leftAncestor = leftAncestor.parent();
                    rightAncestor = rightAncestor.parent();
                    modifierSumLeft += leftAncestor.modifier;
                    modifierSumRight += rightAncestor.modifier;

                    // all the stacked children are oriented towards right so use right variables
                    if ( rightAncestor.stackParent !== undefined ) {
                        modifierSumRight += rightAncestor.size() / 2;
                    }
                }

                // find the gap between two trees and apply it to subTrees
                // and mathing smaller gaps to smaller subtrees

                var totalGap = (firstChildLeftNeighbor.prelim + modifierSumLeft + firstChildLeftNeighbor.size() + this.CONFIG.subTeeSeparation) - (firstChild.prelim + modifierSumRight );

                if ( totalGap > 0 ) {
                    var subtreeAux = node,
                        numSubtrees = 0;

                    // count all the subtrees in the LeftSibling
                    while ( subtreeAux && subtreeAux.id !== leftAncestor.id ) {
                        subtreeAux = subtreeAux.leftSibling();
                        numSubtrees++;
                    }

                    if ( subtreeAux ) {
                        var subtreeMoveAux = node,
                            singleGap = totalGap / numSubtrees;

                        while ( subtreeMoveAux.id !== leftAncestor.id ) {
                            subtreeMoveAux.prelim += totalGap;
                            subtreeMoveAux.modifier += totalGap;

                            totalGap -= singleGap;
                            subtreeMoveAux = subtreeMoveAux.leftSibling();
                        }
                    }
                }

                compareDepth++;

                firstChild = ( firstChild.childrenCount() === 0 )?
                    node.leftMost(0, compareDepth):
                    firstChild = firstChild.firstChild();

                if ( firstChild ) {
                    firstChildLeftNeighbor = firstChild.leftNeighbor();
                }
            }
        },

        /*
         * During a second pre-order walk, each node is given a
         * final x-coordinate by summing its preliminary
         * x-coordinate and the modifiers of all the node's
         * ancestors.  The y-coordinate depends on the height of
         * the tree.  (The roles of x and y are reversed for
         * RootOrientations of EAST or WEST.)
         */
        secondWalk: function( node, level, X, Y ) {
            if ( level <= this.CONFIG.maxDepth ) {
                var xTmp = node.prelim + X,
                    yTmp = Y, align = this.CONFIG.nodeAlign,
                    orient = this.CONFIG.rootOrientation,
                    levelHeight, nodesizeTmp;

                if (orient === 'NORTH' || orient === 'SOUTH') {
                    levelHeight = this.levelMaxDim[level].height;
                    nodesizeTmp = node.height;
                    if (node.pseudo) {
                        node.height = levelHeight;
                    } // assign a new size to pseudo nodes
                }
                else if (orient === 'WEST' || orient === 'EAST') {
                    levelHeight = this.levelMaxDim[level].width;
                    nodesizeTmp = node.width;
                    if (node.pseudo) {
                        node.width = levelHeight;
                    } // assign a new size to pseudo nodes
                }

                node.X = xTmp;

                if (node.pseudo) { // pseudo nodes need to be properly aligned, otherwise position is not correct in some examples
                    if (orient === 'NORTH' || orient === 'WEST') {
                        node.Y = yTmp; // align "BOTTOM"
                    }
                    else if (orient === 'SOUTH' || orient === 'EAST') {
                        node.Y = (yTmp + (levelHeight - nodesizeTmp)); // align "TOP"
                    }

                } else {
                    node.Y = ( align === 'CENTER' ) ? (yTmp + (levelHeight - nodesizeTmp) / 2) :
                        ( align === 'TOP' )  ? (yTmp + (levelHeight - nodesizeTmp)) :
                            yTmp;
                }

                if ( orient === 'WEST' || orient === 'EAST' ) {
                    var swapTmp = node.X;
                    node.X = node.Y;
                    node.Y = swapTmp;
                }

                if (orient === 'SOUTH' ) {
                    node.Y = -node.Y - nodesizeTmp;
                }
                else if ( orient === 'EAST' ) {
                    node.X = -node.X - nodesizeTmp;
                }

                if ( node.childrenCount() !== 0 ) {
                    if ( node.id === 0 && this.CONFIG.hideRootNode ) {
                        // ako je root node Hiden onda nemoj njegovu dijecu pomaknut po Y osi za Level separation, neka ona budu na vrhu
                        this.secondWalk(node.firstChild(), level + 1, X + node.modifier, Y);
                    }
                    else {
                        this.secondWalk(node.firstChild(), level + 1, X + node.modifier, Y + levelHeight + this.CONFIG.levelSeparation);
                    }
                }

                if ( node.rightSibling() ) {
                    this.secondWalk( node.rightSibling(), level, X, Y );
                }
            }
        },

        /**
         * position all the nodes, center the tree in center of its container
         * 0,0 coordinate is in the upper left corner
         * @returns {Tree}
         */
        positionNodes: function() {
            var self = this,
                treeSize = {
                    x: self.nodeDB.getMinMaxCoord('X', null, null),
                    y: self.nodeDB.getMinMaxCoord('Y', null, null)
                },

                treeWidth = treeSize.x.max - treeSize.x.min,
                treeHeight = treeSize.y.max - treeSize.y.min,

                treeCenter = {
                    x: treeSize.x.max - treeWidth/2,
                    y: treeSize.y.max - treeHeight/2
                };

            this.handleOverflow(treeWidth, treeHeight);

            var
                containerCenter = {
                    x: self.drawArea.clientWidth/2,
                    y: self.drawArea.clientHeight/2
                },

                deltaX = containerCenter.x - treeCenter.x,
                deltaY = containerCenter.y - treeCenter.y,

                // all nodes must have positive X or Y coordinates, handle this with offsets
                negOffsetX = ((treeSize.x.min + deltaX) <= 0) ? Math.abs(treeSize.x.min) : 0,
                negOffsetY = ((treeSize.y.min + deltaY) <= 0) ? Math.abs(treeSize.y.min) : 0,
                i, len, node;

            // position all the nodes
            for ( i = 0, len = this.nodeDB.db.length; i < len; i++ ) {

                node = this.nodeDB.get(i);

                self.CONFIG.callback.onBeforePositionNode.apply( self, [node, i, containerCenter, treeCenter] );

                if ( node.id === 0 && this.CONFIG.hideRootNode ) {
                    self.CONFIG.callback.onAfterPositionNode.apply( self, [node, i, containerCenter, treeCenter] );
                    continue;
                }

                // if the tree is smaller than the draw area, then center the tree within drawing area
                node.X += negOffsetX + ((treeWidth < this.drawArea.clientWidth) ? deltaX : this.CONFIG.padding);
                node.Y += negOffsetY + ((treeHeight < this.drawArea.clientHeight) ? deltaY : this.CONFIG.padding);

                var collapsedParent = node.collapsedParent(),
                    hidePoint = null;

                if (collapsedParent) {
                    // position the node behind the connector point of the parent, so future animations can be visible
                    hidePoint = collapsedParent.connectorPoint( true );
                    node.hide(hidePoint);

                }
                else if (node.positioned) {
                    // node is already positioned,
                    node.show();
                }
                else { // inicijalno stvaranje nodeova, postavi lokaciju
                    node.nodeDOM.style.left = node.X + 'px';
                    node.nodeDOM.style.top = node.Y + 'px';
                    node.positioned = true;
                }

                if (node.id !== 0 && !(node.parent().id === 0 && this.CONFIG.hideRootNode)) {
                    this.setConnectionToParent(node, hidePoint); // skip the root node
                }
                else if (!this.CONFIG.hideRootNode && node.drawLineThrough) {
                    // drawlinethrough is performed for for the root node also
                    node.drawLineThroughMe();
                }

                self.CONFIG.callback.onAfterPositionNode.apply( self, [node, i, containerCenter, treeCenter] );
            }
            return this;
        },

        /**
         * Create Raphael instance, (optionally set scroll bars if necessary)
         * @param {number} treeWidth
         * @param {number} treeHeight
         * @returns {Tree}
         */
        handleOverflow: function( treeWidth, treeHeight ) {
            var viewWidth = (treeWidth < this.drawArea.clientWidth) ? this.drawArea.clientWidth : treeWidth + this.CONFIG.padding*2,
                viewHeight = (treeHeight < this.drawArea.clientHeight) ? this.drawArea.clientHeight : treeHeight + this.CONFIG.padding*2;

            this._R.setSize( viewWidth, viewHeight );

            if ( this.CONFIG.scrollbar === 'resize') {
                UTIL.setDimensions( this.drawArea, viewWidth, viewHeight );
            }
            else if ( !UTIL.isjQueryAvailable() || this.CONFIG.scrollbar === 'native' ) {

                if ( this.drawArea.clientWidth < treeWidth ) { // is overflow-x necessary
                    this.drawArea.style.overflowX = "auto";
                }

                if ( this.drawArea.clientHeight < treeHeight ) { // is overflow-y necessary
                    this.drawArea.style.overflowY = "auto";
                }
            }
            // Fancy scrollbar relies heavily on jQuery, so guarding with if ( $ )
            else if ( this.CONFIG.scrollbar === 'fancy') {
                var jq_drawArea = $( this.drawArea );
                if (jq_drawArea.hasClass('ps-container')) { // znaci da je 'fancy' vec inicijaliziran, treba updateat
                    jq_drawArea.find('.Treant').css({
                        width: viewWidth,
                        height: viewHeight
                    });

                    jq_drawArea.perfectScrollbar('update');
                }
                else {
                    var mainContainer = jq_drawArea.wrapInner('<div class="Treant"/>'),
                        child = mainContainer.find('.Treant');

                    child.css({
                        width: viewWidth,
                        height: viewHeight
                    });

                    mainContainer.perfectScrollbar();
                }
            } // else this.CONFIG.scrollbar == 'None'

            return this;
        },        
        /**
         * @param {TreeNode} treeNode
         * @param {boolean} hidePoint
         * @returns {Tree}
         */
        setConnectionToParent: function( treeNode, hidePoint ) {
            var stacked = treeNode.stackParentId,
                connLine,
                parent = ( stacked? this.nodeDB.get( stacked ): treeNode.parent() ),

                pathString = hidePoint?
                    this.getPointPathString(hidePoint):
                    this.getPathString(parent, treeNode, stacked);

            if ( this.connectionStore[treeNode.id] ) {
                // connector already exists, update the connector geometry
                connLine = this.connectionStore[treeNode.id];
                this.animatePath( connLine, pathString );
            }
            else {
                connLine = this._R.path( pathString );
                this.connectionStore[treeNode.id] = connLine;

                // don't show connector arrows por pseudo nodes
                if ( treeNode.pseudo ) {
                    delete parent.connStyle.style['arrow-end'];
                }
                if ( parent.pseudo ) {
                    delete parent.connStyle.style['arrow-start'];
                }

                connLine.attr( parent.connStyle.style );

                if ( treeNode.drawLineThrough || treeNode.pseudo ) {
                    treeNode.drawLineThroughMe( hidePoint );
                }
            }
            treeNode.connector = connLine;
            return this;
        },

        /**
         * Create the path which is represented as a point, used for hiding the connection
         * A path with a leading "_" indicates the path will be hidden
         * See: http://dmitrybaranovskiy.github.io/raphael/reference.html#Paper.path
         * @param {object} hidePoint
         * @returns {string}
         */
        getPointPathString: function( hidePoint ) {
            return ["_M", hidePoint.x, ",", hidePoint.y, 'L', hidePoint.x, ",", hidePoint.y, hidePoint.x, ",", hidePoint.y].join(' ');
        },

        /**
         * This method relied on receiving a valid Raphael Paper.path.
         * See: http://dmitrybaranovskiy.github.io/raphael/reference.html#Paper.path
         * A pathString is typically in the format of "M10,20L30,40"
         * @param path
         * @param {string} pathString
         * @returns {Tree}
         */
        animatePath: function( path, pathString ) {
            if (path.hidden && pathString.charAt(0) !== "_") { // path will be shown, so show it
                path.show();
                path.hidden = false;
            }

            // See: http://dmitrybaranovskiy.github.io/raphael/reference.html#Element.animate
            path.animate(
                {
                    path: pathString.charAt(0) === "_"?
                        pathString.substring(1):
                        pathString // remove the "_" prefix if it exists
                },
                this.CONFIG.animation.connectorsSpeed,
                this.CONFIG.animation.connectorsAnimation,
                function() {
                    if ( pathString.charAt(0) === "_" ) { // animation is hiding the path, hide it at the and of animation
                        path.hide();
                        path.hidden = true;
                    }
                }
            );
            return this;
        },

        /**
         *
         * @param {TreeNode} from_node
         * @param {TreeNode} to_node
         * @param {boolean} stacked
         * @returns {string}
         */
        getPathString: function( from_node, to_node, stacked ) {
            var startPoint = from_node.connectorPoint( true ),
                endPoint = to_node.connectorPoint( false ),
                orientation = this.CONFIG.rootOrientation,
                connType = from_node.connStyle.type,
                P1 = {}, P2 = {};

            if ( orientation === 'NORTH' || orientation === 'SOUTH' ) {
                P1.y = P2.y = (startPoint.y + endPoint.y) / 2;

                P1.x = startPoint.x;
                P2.x = endPoint.x;
            }
            else if ( orientation === 'EAST' || orientation === 'WEST' ) {
                P1.x = P2.x = (startPoint.x + endPoint.x) / 2;

                P1.y = startPoint.y;
                P2.y = endPoint.y;
            }

            // sp, p1, pm, p2, ep == "x,y"
            var sp = startPoint.x+','+startPoint.y, p1 = P1.x+','+P1.y, p2 = P2.x+','+P2.y, ep = endPoint.x+','+endPoint.y,
                pm = (P1.x + P2.x)/2 +','+ (P1.y + P2.y)/2, pathString, stackPoint;

            if ( stacked ) { // STACKED CHILDREN

                stackPoint = (orientation === 'EAST' || orientation === 'WEST')?
                endPoint.x+','+startPoint.y:
                startPoint.x+','+endPoint.y;

                if ( connType === "step" || connType === "straight" ) {
                    pathString = ["M", sp, 'L', stackPoint, 'L', ep];
                }
                else if ( connType === "curve" || connType === "bCurve" ) {
                    var helpPoint, // used for nicer curve lines
                        indent = from_node.connStyle.stackIndent;

                    if ( orientation === 'NORTH' ) {
                        helpPoint = (endPoint.x - indent)+','+(endPoint.y - indent);
                    }
                    else if ( orientation === 'SOUTH' ) {
                        helpPoint = (endPoint.x - indent)+','+(endPoint.y + indent);
                    }
                    else if ( orientation === 'EAST' ) {
                        helpPoint = (endPoint.x + indent) +','+startPoint.y;
                    }
                    else if ( orientation === 'WEST' ) {
                        helpPoint = (endPoint.x - indent) +','+startPoint.y;
                    }
                    pathString = ["M", sp, 'L', helpPoint, 'S', stackPoint, ep];
                }

            }
            else {  // NORMAL CHILDREN
                if ( connType === "step" ) {
                    pathString = ["M", sp, 'L', p1, 'L', p2, 'L', ep];
                }
                else if ( connType === "curve" ) {
                    pathString = ["M", sp, 'C', p1, p2, ep ];
                }
                else if ( connType === "bCurve" ) {
                    pathString = ["M", sp, 'Q', p1, pm, 'T', ep];
                }
                else if (connType === "straight" ) {
                    pathString = ["M", sp, 'L', sp, ep];
                }
            }

            return pathString.join(" ");
        },

        /**
         * Algorithm works from left to right, so previous processed node will be left neighbour of the next node
         * @param {TreeNode} node
         * @param {number} level
         * @returns {Tree}
         */
        setNeighbors: function( node, level ) {
            node.leftNeighborId = this.lastNodeOnLevel[level];
            if ( node.leftNeighborId ) {
                node.leftNeighbor().rightNeighborId = node.id;
            }
            this.lastNodeOnLevel[level] = node.id;
            return this;
        },

        /**
         * Used for calculation of height and width of a level (level dimensions)
         * @param {TreeNode} node
         * @param {number} level
         * @returns {Tree}
         */
        calcLevelDim: function( node, level ) { // root node is on level 0
            this.levelMaxDim[level] = {
                width: Math.max( this.levelMaxDim[level]? this.levelMaxDim[level].width: 0, node.width ),
                height: Math.max( this.levelMaxDim[level]? this.levelMaxDim[level].height: 0, node.height )
            };
            return this;
        },

        /**
         * @returns {Tree}
         */
        resetLevelData: function() {
            this.lastNodeOnLevel = [];
            this.levelMaxDim = [];
            return this;
        },

        /**
         * @returns {TreeNode}
         */
        root: function() {
            return this.nodeDB.get( 0 );
        }
    };

    /**
     * NodeDB is used for storing the nodes. Each tree has its own NodeDB.
     * @param {object} nodeStructure
     * @param {Tree} tree
     * @constructor
     */
    var NodeDB = function ( nodeStructure, tree ) {
        this.reset( nodeStructure, tree );
    };

    NodeDB.prototype = {

        /**
         * @param {object} nodeStructure
         * @param {Tree} tree
         * @returns {NodeDB}
         */
        reset: function( nodeStructure, tree ) {

            this.db = [];

            var self = this;

            /**
             * @param {object} node
             * @param {number} parentId
             */
            function iterateChildren( node, parentId ) {
                var newNode = self.createNode( node, parentId, tree, null );

                if ( node.children ) {
                    // pseudo node is used for descending children to the next level
                    if ( node.childrenDropLevel && node.childrenDropLevel > 0 ) {
                        while ( node.childrenDropLevel-- ) {
                            // pseudo node needs to inherit the connection style from its parent for continuous connectors
                            var connStyle = UTIL.cloneObj( newNode.connStyle );
                            newNode = self.createNode( 'pseudo', newNode.id, tree, null );
                            newNode.connStyle = connStyle;
                            newNode.children = [];
                        }
                    }

                    var stack = ( node.stackChildren && !self.hasGrandChildren( node ) )? newNode.id: null;

                    // children are positioned on separate levels, one beneath the other
                    if ( stack !== null ) {
                        newNode.stackChildren = [];
                    }

                    for ( var i = 0, len = node.children.length; i < len ; i++ ) {
                        if ( stack !== null ) {
                            newNode =  self.createNode( node.children[i], newNode.id, tree, stack );
                            if ( ( i + 1 ) < len ) {
                                // last node cant have children
                                newNode.children = [];
                            }
                        }
                        else {
                            iterateChildren( node.children[i], newNode.id );
                        }
                    }
                }
            }

            if ( tree.CONFIG.animateOnInit ) {
                nodeStructure.collapsed = true;
            }

            iterateChildren( nodeStructure, -1 ); // root node

            this.createGeometries( tree );

            return this;
        },

        /**
         * @param {Tree} tree
         * @returns {NodeDB}
         */
        createGeometries: function( tree ) {
            var i = this.db.length;

            while ( i-- ) {
                this.get( i ).createGeometry( tree );
            }
            return this;
        },

        /**
         * @param {number} nodeId
         * @returns {TreeNode}
         */
        get: function ( nodeId ) {
            return this.db[nodeId]; // get TreeNode by ID
        },

        /**
         * @param {function} callback
         * @returns {NodeDB}
         */
        walk: function( callback ) {
            var i = this.db.length;

            while ( i-- ) {
                callback.apply( this, [ this.get( i ) ] );
            }
            return this;
        },

        /**
         *
         * @param {object} nodeStructure
         * @param {number} parentId
         * @param {Tree} tree
         * @param {number} stackParentId
         * @returns {TreeNode}
         */
        createNode: function( nodeStructure, parentId, tree, stackParentId ) {
            var node = new TreeNode( nodeStructure, this.db.length, parentId, tree, stackParentId );

            this.db.push( node );

            // skip root node (0)
            if ( parentId >= 0 ) {
                var parent = this.get( parentId );

                // todo: refactor into separate private method
                if ( nodeStructure.position ) {
                    if ( nodeStructure.position === 'left' ) {
                        parent.children.push( node.id );
                    }
                    else if ( nodeStructure.position === 'right' ) {
                        parent.children.splice( 0, 0, node.id );
                    }
                    else if ( nodeStructure.position === 'center' ) {
                        parent.children.splice( Math.floor( parent.children.length / 2 ), 0, node.id );
                    }
                    else {
                        // edge case when there's only 1 child
                        var position = parseInt( nodeStructure.position );
                        if ( parent.children.length === 1 && position > 0 ) {
                            parent.children.splice( 0, 0, node.id );
                        }
                        else {
                            parent.children.splice(
                                Math.max( position, parent.children.length - 1 ),
                                0, node.id
                            );
                        }
                    }
                }
                else {
                    parent.children.push( node.id );
                }
            }

            if ( stackParentId ) {
                this.get( stackParentId ).stackParent = true;
                this.get( stackParentId ).stackChildren.push( node.id );
            }

            return node;
        },

        getMinMaxCoord: function( dim, parent, MinMax ) { // used for getting the dimensions of the tree, dim = 'X' || 'Y'
            // looks for min and max (X and Y) within the set of nodes
            parent = parent || this.get(0);

            MinMax = MinMax || { // start with root node dimensions
                    min: parent[dim],
                    max: parent[dim] + ( ( dim === 'X' )? parent.width: parent.height )
                };

            var i = parent.childrenCount();

            while ( i-- ) {
                var node = parent.childAt( i ),
                    maxTest = node[dim] + ( ( dim === 'X' )? node.width: node.height ),
                    minTest = node[dim];

                if ( maxTest > MinMax.max ) {
                    MinMax.max = maxTest;
                }
                if ( minTest < MinMax.min ) {
                    MinMax.min = minTest;
                }

                this.getMinMaxCoord( dim, node, MinMax );
            }
            return MinMax;
        },

        /**
         * @param {object} nodeStructure
         * @returns {boolean}
         */
        hasGrandChildren: function( nodeStructure ) {
            var i = nodeStructure.children.length;
            while ( i-- ) {
                if ( nodeStructure.children[i].children ) {
                    return true;
                }
            }
            return false;
        }
    };

    /**
     * TreeNode constructor.
     * @param {object} nodeStructure
     * @param {number} id
     * @param {number} parentId
     * @param {Tree} tree
     * @param {number} stackParentId
     * @constructor
     */
    var TreeNode = function( nodeStructure, id, parentId, tree, stackParentId ) {
        this.reset( nodeStructure, id, parentId, tree, stackParentId );
    };

    TreeNode.prototype = {

        /**
         * @param {object} nodeStructure
         * @param {number} id
         * @param {number} parentId
         * @param {Tree} tree
         * @param {number} stackParentId
         * @returns {TreeNode}
         */
        reset: function( nodeStructure, id, parentId, tree, stackParentId ) {
            this.id = id;
            this.parentId = parentId;
            this.treeId = tree.id;

            this.prelim = 0;
            this.modifier = 0;
            this.leftNeighborId = null;

            this.stackParentId = stackParentId;

            // pseudo node is a node with width=height=0, it is invisible, but necessary for the correct positioning of the tree
            this.pseudo = nodeStructure === 'pseudo' || nodeStructure['pseudo']; // todo: surely if nodeStructure is a scalar then the rest will error:

            this.meta = nodeStructure.meta || {};
            this.image = nodeStructure.image || null;

            this.link = UTIL.createMerge( tree.CONFIG.node.link,  nodeStructure.link );

            this.connStyle = UTIL.createMerge( tree.CONFIG.connectors, nodeStructure.connectors );
            this.connector = null;

            this.drawLineThrough = nodeStructure.drawLineThrough === false ? false : ( nodeStructure.drawLineThrough || tree.CONFIG.node.drawLineThrough );

            this.collapsable = nodeStructure.collapsable === false ? false : ( nodeStructure.collapsable || tree.CONFIG.node.collapsable );
            this.collapsed = nodeStructure.collapsed;

            this.text = nodeStructure.text;

            // '.node' DIV
            this.nodeInnerHTML = nodeStructure.innerHTML;
            this.nodeHTMLclass = (tree.CONFIG.node.HTMLclass ? tree.CONFIG.node.HTMLclass : '') + // globally defined class for the nodex
                (nodeStructure.HTMLclass ? (' ' + nodeStructure.HTMLclass) : '');       // + specific node class

            this.nodeHTMLid = nodeStructure.HTMLid;

            this.children = [];

            this.X = 0;
            this.Y = 0;

            return this;
        },

        /**
         * @returns {Tree}
         */
        getTree: function() {
            return TreeStore.get( this.treeId );
        },

        /**
         * @returns {object}
         */
        getTreeConfig: function() {
            return this.getTree().CONFIG;
        },

        /**
         * @returns {NodeDB}
         */
        getTreeNodeDb: function() {
            return this.getTree().getNodeDb();
        },

        /**
         * @param {number} nodeId
         * @returns {TreeNode}
         */
        lookupNode: function( nodeId ) {
            return this.getTreeNodeDb().get( nodeId );
        },

        /**
         * @returns {Tree}
         */
        Tree: function() {
            return TreeStore.get( this.treeId );
        },

        /**
         * @param {number} nodeId
         * @returns {TreeNode}
         */
        dbGet: function( nodeId ) {
            return this.getTreeNodeDb().get( nodeId );
        },

        /**
         * Returns the width of the node
         * @returns {float}
         */
        size: function() {
            var orientation = this.getTreeConfig().rootOrientation;

            if ( this.pseudo ) {
                // prevents separating the subtrees
                return ( -this.getTreeConfig().subTeeSeparation );
            }

            if ( orientation === 'NORTH' || orientation === 'SOUTH' ) {
                return this.width;
            }
            else if ( orientation === 'WEST' || orientation === 'EAST' ) {
                return this.height;
            }
        },

        /**
         * @returns {number}
         */
        childrenCount: function () {
            return ( ( this.collapsed || !this.children)? 0: this.children.length );
        },

        /**
         * @param {number} index
         * @returns {TreeNode}
         */
        childAt: function( index ) {
            return this.dbGet( this.children[index] );
        },

        /**
         * @returns {TreeNode}
         */
        firstChild: function() {
            return this.childAt( 0 );
        },

        /**
         * @returns {TreeNode}
         */
        lastChild: function() {
            return this.childAt( this.children.length - 1 );
        },

        /**
         * @returns {TreeNode}
         */
        parent: function() {
            return this.lookupNode( this.parentId );
        },

        /**
         * @returns {TreeNode}
         */
        leftNeighbor: function() {
            if ( this.leftNeighborId ) {
                return this.lookupNode( this.leftNeighborId );
            }
        },

        /**
         * @returns {TreeNode}
         */
        rightNeighbor: function() {
            if ( this.rightNeighborId ) {
                return this.lookupNode( this.rightNeighborId );
            }
        },

        /**
         * @returns {TreeNode}
         */
        leftSibling: function () {
            var leftNeighbor = this.leftNeighbor();

            if ( leftNeighbor && leftNeighbor.parentId === this.parentId ){
                return leftNeighbor;
            }
        },

        /**
         * @returns {TreeNode}
         */
        rightSibling: function () {
            var rightNeighbor = this.rightNeighbor();

            if ( rightNeighbor && rightNeighbor.parentId === this.parentId ) {
                return rightNeighbor;
            }
        },

        /**
         * @returns {number}
         */
        childrenCenter: function () {
            var first = this.firstChild(),
                last = this.lastChild();

            return ( first.prelim + ((last.prelim - first.prelim) + last.size()) / 2 );
        },

        /**
         * Find out if one of the node ancestors is collapsed
         * @returns {*}
         */
        collapsedParent: function() {
            var parent = this.parent();
            if ( !parent ) {
                return false;
            }
            if ( parent.collapsed ) {
                return parent;
            }
            return parent.collapsedParent();
        },

        /**
         * Returns the leftmost child at specific level, (initial level = 0)
         * @param level
         * @param depth
         * @returns {*}
         */
        leftMost: function ( level, depth ) {
            if ( level >= depth ) {
                return this;
            }
            if ( this.childrenCount() === 0 ) {
                return;
            }

            for ( var i = 0, n = this.childrenCount(); i < n; i++ ) {
                var leftmostDescendant = this.childAt( i ).leftMost( level + 1, depth );
                if ( leftmostDescendant ) {
                    return leftmostDescendant;
                }
            }
        },

        // returns start or the end point of the connector line, origin is upper-left
        connectorPoint: function(startPoint) {
            var orient = this.Tree().CONFIG.rootOrientation, point = {};

            if ( this.stackParentId ) { // return different end point if node is a stacked child
                if ( orient === 'NORTH' || orient === 'SOUTH' ) {
                    orient = 'WEST';
                }
                else if ( orient === 'EAST' || orient === 'WEST' ) {
                    orient = 'NORTH';
                }
            }

            // if pseudo, a virtual center is used
            if ( orient === 'NORTH' ) {
                point.x = (this.pseudo) ? this.X - this.Tree().CONFIG.subTeeSeparation/2 : this.X + this.width/2;
                point.y = (startPoint) ? this.Y + this.height : this.Y;
            }
            else if (orient === 'SOUTH') {
                point.x = (this.pseudo) ? this.X - this.Tree().CONFIG.subTeeSeparation/2 : this.X + this.width/2;
                point.y = (startPoint) ? this.Y : this.Y + this.height;
            }
            else if (orient === 'EAST') {
                point.x = (startPoint) ? this.X : this.X + this.width;
                point.y = (this.pseudo) ? this.Y - this.Tree().CONFIG.subTeeSeparation/2 : this.Y + this.height/2;
            }
            else if (orient === 'WEST') {
                point.x = (startPoint) ? this.X + this.width : this.X;
                point.y =  (this.pseudo) ? this.Y - this.Tree().CONFIG.subTeeSeparation/2 : this.Y + this.height/2;
            }
            return point;
        },

        /**
         * @returns {string}
         */
        pathStringThrough: function() { // get the geometry of a path going through the node
            var startPoint = this.connectorPoint( true ),
                endPoint = this.connectorPoint( false );

            return ["M", startPoint.x+","+startPoint.y, 'L', endPoint.x+","+endPoint.y].join(" ");
        },

        /**
         * @param {object} hidePoint
         */
        drawLineThroughMe: function( hidePoint ) { // hidepoint se proslijedjuje ako je node sakriven zbog collapsed
            var pathString = hidePoint?
                this.Tree().getPointPathString( hidePoint ):
                this.pathStringThrough();

            this.lineThroughMe = this.lineThroughMe || this.Tree()._R.path(pathString);

            var line_style = UTIL.cloneObj( this.connStyle.style );

            delete line_style['arrow-start'];
            delete line_style['arrow-end'];

            this.lineThroughMe.attr( line_style );

            if ( hidePoint ) {
                this.lineThroughMe.hide();
                this.lineThroughMe.hidden = true;
            }
        },

        addSwitchEvent: function( nodeSwitch ) {
            var self = this;
            UTIL.addEvent( nodeSwitch, 'click',
                function( e ) {
                    e.preventDefault();
                    if ( self.getTreeConfig().callback.onBeforeClickCollapseSwitch.apply( self, [ nodeSwitch, e ] ) === false ) {
                        return false;
                    }

                    self.toggleCollapse();

                    self.getTreeConfig().callback.onAfterClickCollapseSwitch.apply( self, [ nodeSwitch, e ] );
                }
            );
        },

        /**
         * @returns {TreeNode}
         */
        collapse: function() {
            if ( !this.collapsed ) {
                this.toggleCollapse();
            }
            return this;
        },

        /**
         * @returns {TreeNode}
         */
        expand: function() {
            if ( this.collapsed ) {
                this.toggleCollapse();
            }
            return this;
        },

        /**
         * @returns {TreeNode}
         */
        toggleCollapse: function() {
            var oTree = this.getTree();

            if ( !oTree.inAnimation ) {
                oTree.inAnimation = true;

                this.collapsed = !this.collapsed; // toggle the collapse at each click
                UTIL.toggleClass( this.nodeDOM, 'collapsed', this.collapsed );

                oTree.positionTree();

                var self = this;

                setTimeout(
                    function() { // set the flag after the animation
                        oTree.inAnimation = false;
                        oTree.CONFIG.callback.onToggleCollapseFinished.apply( oTree, [ self, self.collapsed ] );
                    },
                    ( oTree.CONFIG.animation.nodeSpeed > oTree.CONFIG.animation.connectorsSpeed )?
                        oTree.CONFIG.animation.nodeSpeed:
                        oTree.CONFIG.animation.connectorsSpeed
                );
            }
            return this;
        },

        hide: function( collapse_to_point ) {
            collapse_to_point = collapse_to_point || false;

            var bCurrentState = this.hidden;
            this.hidden = true;

            this.nodeDOM.style.overflow = 'hidden';

            var tree = this.getTree(),
                config = this.getTreeConfig(),
                oNewState = {
                    opacity: 0
                };

            if ( collapse_to_point ) {
                oNewState.left = collapse_to_point.x;
                oNewState.top = collapse_to_point.y;
            }

            // if parent was hidden in initial configuration, position the node behind the parent without animations
            if ( !this.positioned || bCurrentState ) {
                this.nodeDOM.style.visibility = 'hidden';
                if ( $ ) {
                    $( this.nodeDOM ).css( oNewState );
                }
                else {
                    this.nodeDOM.style.left = oNewState.left + 'px';
                    this.nodeDOM.style.top = oNewState.top + 'px';
                }
                this.positioned = true;
            }
            else {
                // todo: fix flashy bug when a node is manually hidden and tree.redraw is called.
                if ( $ ) {
                    $( this.nodeDOM ).animate(
                        oNewState, config.animation.nodeSpeed, config.animation.nodeAnimation,
                        function () {
                            this.style.visibility = 'hidden';
                        }
                    );
                }
                else {
                    this.nodeDOM.style.transition = 'all '+config.animation.nodeSpeed+'ms ease';
                    this.nodeDOM.style.transitionProperty = 'opacity, left, top';
                    this.nodeDOM.style.opacity = oNewState.opacity;
                    this.nodeDOM.style.left = oNewState.left + 'px';
                    this.nodeDOM.style.top = oNewState.top + 'px';
                    this.nodeDOM.style.visibility = 'hidden';
                }
            }

            // animate the line through node if the line exists
            if ( this.lineThroughMe ) {
                var new_path = tree.getPointPathString( collapse_to_point );
                if ( bCurrentState ) {
                    // update without animations
                    this.lineThroughMe.attr( { path: new_path } );
                }
                else {
                    // update with animations
                    tree.animatePath( this.lineThroughMe, tree.getPointPathString( collapse_to_point ) );
                }
            }

            return this;
        },

        /**
         * @returns {TreeNode}
         */
        hideConnector: function() {
            var oTree = this.Tree();
            var oPath = oTree.connectionStore[this.id];
            if ( oPath ) {
                oPath.animate(
                    { 'opacity': 0 },
                    oTree.CONFIG.animation.connectorsSpeed,
                    oTree.CONFIG.animation.connectorsAnimation
                );
            }
            return this;
        },

        show: function() {
            var bCurrentState = this.hidden;
            this.hidden = false;

            this.nodeDOM.style.visibility = 'visible';

            var oTree = this.Tree();

            var oNewState = {
                    left: this.X,
                    top: this.Y,
                    opacity: 1
                },
                config = this.getTreeConfig();

            // if the node was hidden, update opacity and position
            if ( $ ) {
                $( this.nodeDOM ).animate(
                    oNewState,
                    config.animation.nodeSpeed, config.animation.nodeAnimation,
                    function () {
                        // $.animate applies "overflow:hidden" to the node, remove it to avoid visual problems
                        this.style.overflow = "";
                    }
                );
            }
            else {
                this.nodeDOM.style.transition = 'all '+config.animation.nodeSpeed+'ms ease';
                this.nodeDOM.style.transitionProperty = 'opacity, left, top';
                this.nodeDOM.style.left = oNewState.left + 'px';
                this.nodeDOM.style.top = oNewState.top + 'px';
                this.nodeDOM.style.opacity = oNewState.opacity;
                this.nodeDOM.style.overflow = '';
            }

            if ( this.lineThroughMe ) {
                this.getTree().animatePath( this.lineThroughMe, this.pathStringThrough() );
            }

            return this;
        },

        /**
         * @returns {TreeNode}
         */
        showConnector: function() {
            var oTree = this.Tree();
            var oPath = oTree.connectionStore[this.id];
            if ( oPath ) {
                oPath.animate(
                    { 'opacity': 1 },
                    oTree.CONFIG.animation.connectorsSpeed,
                    oTree.CONFIG.animation.connectorsAnimation
                );
            }
            return this;
        }
    };


    /**
     * Build a node from the 'text' and 'img' property and return with it.
     *
     * The node will contain all the fields that present under the 'text' property
     * Each field will refer to a css class with name defined as node-{$property_name}
     *
     * Example:
     * The definition:
     *
     *   text: {
     *     desc: "some description",
     *     paragraph: "some text"
     *   }
     *
     * will generate the following elements:
     *
     *   <p class="node-desc">some description</p>
     *   <p class="node-paragraph">some text</p>
     *
     * @Returns the configured node
     */
    TreeNode.prototype.buildNodeFromText = function (node) {
        // IMAGE
        if (this.image) {
            image = document.createElement('img');
            image.src = this.image;
            node.appendChild(image);
        }

        // TEXT
        if (this.text) {
            for (var key in this.text) {
                // adding DATA Attributes to the node
                if (key.startsWith("data-")) {
                    node.setAttribute(key, this.text[key]);
                } else {
                    
                    var textElement = document.createElement(this.text[key].href ? 'a' : 'p');
                    
                    // make an <a> element if required
                    if (this.text[key].href) {
                        textElement.href = this.text[key].href;
                        if (this.text[key].target) {
                            textElement.target = this.text[key].target;
                        }
                    }
                    
                    textElement.className =  "node-"+key;
                    textElement.appendChild(document.createTextNode(
                        this.text[key].val ? this.text[key].val :
                        this.text[key] instanceof Object ? "'val' param missing!" : this.text[key]
                    )
                    );
                    
                    node.appendChild(textElement);
                }
            }
        }
        return node;
    };

    /**
     * Build a node from  'nodeInnerHTML' property that defines an existing HTML element, referenced by it's id, e.g: #someElement
     * Change the text in the passed node to 'Wrong ID selector' if the referenced element does ot exist,
     * return with a cloned and configured node otherwise
     *
     * @Returns node the configured node
     */
    TreeNode.prototype.buildNodeFromHtml = function(node) {
        // get some element by ID and clone its structure into a node
        if (this.nodeInnerHTML.charAt(0) === "#") {
            var elem = document.getElementById(this.nodeInnerHTML.substring(1));
            if (elem) {
                node = elem.cloneNode(true);
                node.id += "-clone";
                node.className += " node";
            }
            else {
                node.innerHTML = "<b> Wrong ID selector </b>";
            }
        }
        else {
            // insert your custom HTML into a node
            node.innerHTML = this.nodeInnerHTML;
        }
        return node;
    };

    /**
     * @param {Tree} tree
     */
    TreeNode.prototype.createGeometry = function( tree ) {
        if ( this.id === 0 && tree.CONFIG.hideRootNode ) {
            this.width = 0;
            this.height = 0;
            return;
        }

        var drawArea = tree.drawArea,
            image,

            /////////// CREATE NODE //////////////
            node = document.createElement( this.link.href? 'a': 'div' );

        node.className = ( !this.pseudo )? TreeNode.CONFIG.nodeHTMLclass: 'pseudo';
        if ( this.nodeHTMLclass && !this.pseudo ) {
            node.className += ' ' + this.nodeHTMLclass;
        }

        if ( this.nodeHTMLid ) {
            node.id = this.nodeHTMLid;
        }

        if ( this.link.href ) {
            node.href = this.link.href;
            node.target = this.link.target;
        }

        if ( $ ) {
            $( node ).data( 'treenode', this );
        }
        else {
            node.data = {
                'treenode': this
            };
        }

        /////////// BUILD NODE CONTENT //////////////
        if ( !this.pseudo ) {
            node = this.nodeInnerHTML? this.buildNodeFromHtml(node) : this.buildNodeFromText(node)

            // handle collapse switch
            if ( this.collapsed || (this.collapsable && this.childrenCount() && !this.stackParentId) ) {
                this.createSwitchGeometry( tree, node );
            }
        }

        tree.CONFIG.callback.onCreateNode.apply( tree, [this, node] );

        /////////// APPEND all //////////////
        drawArea.appendChild(node);

        this.width = node.offsetWidth;
        this.height = node.offsetHeight;

        this.nodeDOM = node;

        tree.imageLoader.processNode(this);
    };

    /**
     * @param {Tree} tree
     * @param {Element} nodeEl
     */
    TreeNode.prototype.createSwitchGeometry = function( tree, nodeEl ) {
        nodeEl = nodeEl || this.nodeDOM;

        // safe guard and check to see if it has a collapse switch
        var nodeSwitchEl = UTIL.findEl( '.collapse-switch', true, nodeEl );
        if ( !nodeSwitchEl ) {
            nodeSwitchEl = document.createElement( 'a' );
            nodeSwitchEl.className = "collapse-switch";

            nodeEl.appendChild( nodeSwitchEl );
            this.addSwitchEvent( nodeSwitchEl );
            if ( this.collapsed ) {
                nodeEl.className += " collapsed";
            }

            tree.CONFIG.callback.onCreateNodeCollapseSwitch.apply( tree, [this, nodeEl, nodeSwitchEl] );
        }
        return nodeSwitchEl;
    };


    // ###########################################
    //      Expose global + default CONFIG params
    // ###########################################


    Tree.CONFIG = {
        maxDepth: 100,
        rootOrientation: 'NORTH', // NORTH || EAST || WEST || SOUTH
        nodeAlign: 'CENTER', // CENTER || TOP || BOTTOM
        levelSeparation: 30,
        siblingSeparation: 30,
        subTeeSeparation: 30,

        hideRootNode: false,

        animateOnInit: false,
        animateOnInitDelay: 500,

        padding: 15, // the difference is seen only when the scrollbar is shown
        scrollbar: 'native', // "native" || "fancy" || "None" (PS: "fancy" requires jquery and perfect-scrollbar)

        connectors: {
            type: 'curve', // 'curve' || 'step' || 'straight' || 'bCurve'
            style: {
                stroke: 'black'
            },
            stackIndent: 15
        },

        node: { // each node inherits this, it can all be overridden in node config

            // HTMLclass: 'node',
            // drawLineThrough: false,
            // collapsable: false,
            link: {
                target: '_self'
            }
        },

        animation: { // each node inherits this, it can all be overridden in node config
            nodeSpeed: 450,
            nodeAnimation: 'linear',
            connectorsSpeed: 450,
            connectorsAnimation: 'linear'
        },

        callback: {
            onCreateNode: function( treeNode, treeNodeDom ) {}, // this = Tree
            onCreateNodeCollapseSwitch: function( treeNode, treeNodeDom, switchDom ) {}, // this = Tree
            onAfterAddNode: function( newTreeNode, parentTreeNode, nodeStructure ) {}, // this = Tree
            onBeforeAddNode: function( parentTreeNode, nodeStructure ) {}, // this = Tree
            onAfterPositionNode: function( treeNode, nodeDbIndex, containerCenter, treeCenter) {}, // this = Tree
            onBeforePositionNode: function( treeNode, nodeDbIndex, containerCenter, treeCenter) {}, // this = Tree
            onToggleCollapseFinished: function ( treeNode, bIsCollapsed ) {}, // this = Tree
            onAfterClickCollapseSwitch: function( nodeSwitch, event ) {}, // this = TreeNode
            onBeforeClickCollapseSwitch: function( nodeSwitch, event ) {}, // this = TreeNode
            onTreeLoaded: function( rootTreeNode ) {} // this = Tree
        }
    };

    TreeNode.CONFIG = {
        nodeHTMLclass: 'node'
    };

    // #############################################
    // Makes a JSON chart config out of Array config
    // #############################################

    var JSONconfig = {
        make: function( configArray ) {

            var i = configArray.length, node;

            this.jsonStructure = {
                chart: null,
                nodeStructure: null
            };
            //fist loop: find config, find root;
            while(i--) {
                node = configArray[i];
                if (node.hasOwnProperty('container')) {
                    this.jsonStructure.chart = node;
                    continue;
                }

                if (!node.hasOwnProperty('parent') && ! node.hasOwnProperty('container')) {
                    this.jsonStructure.nodeStructure = node;
                    node._json_id = 0;
                }
            }

            this.findChildren(configArray);

            return this.jsonStructure;
        },

        findChildren: function(nodes) {
            var parents = [0]; // start with a a root node

            while(parents.length) {
                var parentId = parents.pop(),
                    parent = this.findNode(this.jsonStructure.nodeStructure, parentId),
                    i = 0, len = nodes.length,
                    children = [];

                for(;i<len;i++) {
                    var node = nodes[i];
                    if(node.parent && (node.parent._json_id === parentId)) { // skip config and root nodes

                        node._json_id = this.getID();

                        delete node.parent;

                        children.push(node);
                        parents.push(node._json_id);
                    }
                }

                if (children.length) {
                    parent.children = children;
                }
            }
        },

        findNode: function( node, nodeId ) {
            var childrenLen, found;

            if (node._json_id === nodeId) {
                return node;
            }
            else if ( node.children ) {
                childrenLen = node.children.length;
                while ( childrenLen-- ) {
                    found = this.findNode(node.children[childrenLen], nodeId);
                    if ( found ) {
                        return found;
                    }
                }
            }
        },

        getID: (
            function() {
                var i = 1;
                return function() {
                    return i++;
                };
            }
        )()
    };

    /**
     * Chart constructor.
     */
    var Treant = function( jsonConfig, callback, jQuery ) {
        if ( jsonConfig instanceof Array ) {
            jsonConfig = JSONconfig.make( jsonConfig );
        }

        // optional
        if ( jQuery ) {
            $ = jQuery;
        }

        this.tree = TreeStore.createTree( jsonConfig );
        this.tree.positionTree( callback );
    };

    Treant.prototype.destroy = function() {
        TreeStore.destroy( this.tree.id );
    };

    /* expose constructor globally */
    exports.Treant = Treant;

})( this.hasOwnProperty('window') ? window: module.exports );