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gridpluginlayer.py
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"""
/***************************************************************************
GridPluginLayer - manages and draws an overlay grid.
A QGIS plugin
Overlays a user-definable grid on the map.
-------------------
begin : 2012-05-11
copyright : (C) 2012 by John Donovan
email : [email protected]
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import math
import pdb
from PyQt4 import QtCore, QtGui, QtXml
from qgis import core, gui
from qgis.core import QGis
from util import *
from gridpropertiesdialog import GridPropertiesDialog
class GridPluginLayer(core.QgsPluginLayer):
LAYER_TYPE = 'grid'
_featuremap = {
0: core.QgsField('cell_num', QtCore.QVariant.Int, 'integer', 8),
1: core.QgsField('angle', QtCore.QVariant.Double, 'double', 8, 4),
2: core.QgsField('ordinate', QtCore.QVariant.String, 'string', 32),
3: core.QgsField('alignment', QtCore.QVariant.String, 'string', 8),
4: core.QgsField('offset_x', QtCore.QVariant.Double, 'double', 8, 4),
5: core.QgsField('offset_y', QtCore.QVariant.Double, 'double', 8, 4)
}
def __init__(self, iface):
core.QgsPluginLayer.__init__(self, GridPluginLayer.LAYER_TYPE,
'Grid overlay')
self.setValid(True)
props = {'width':'0', 'color':'0,255,0'}
self.symbol = core.QgsLineSymbolV2.createSimple(props)
self.origin = core.QgsPoint(0.0, 0.0)
self.numCellsX = 1
self.numCellsY = 1
self.gridOffsetX = 0
self.gridOffsetY = 0
self.cellSizeX = 10.0
self.cellSizeY = 10.0
self.baselineAngle = 0.0
self.grid = []
self.label = core.QgsLabel(GridPluginLayer._featuremap)
self.label_features = []
self.draw_labels = False
self.label_type = 0
self.label_precision = 0
self.label_orientation = 0
self.label_format = 0
self.label_hemisphere = True
self.label_leading_zeros = True
self.label_degrees_diff = False
self.label_xoff_horizontal = 0.0
self.label_xoff_vertical = 0.0
self.label_yoff_horizontal = 0.0
self.label_yoff_vertical = 0.0
proj = core.QgsProject.instance()
# Default CRS: 3452 == EPSG:4326
srid = proj.readNumEntry('SpatialRefSys', '/ProjectCRSID', 3452)[0]
# It's OK to use the internal ID because it's a one-time
# initialisation straight from the current project.
crs = core.QgsCoordinateReferenceSystem(srid, core.QgsCoordinateReferenceSystem.InternalCrsId)
self.setCrs(crs)
self.clickTool = gui.QgsMapToolEmitPoint(iface.mapCanvas())
self.clickTool.canvasClicked.connect(self.canvasClicked)
iface.mapCanvas().setMapTool(self.clickTool)
def draw(self, renderContext):
mapToPixel = renderContext.mapToPixel()
proj = core.QgsProject.instance()
# Default CRS: 3452 == EPSG:4326
srid = proj.readNumEntry('SpatialRefSys', '/ProjectCRSID', 3452)[0]
crs = core.QgsCoordinateReferenceSystem(srid, core.QgsCoordinateReferenceSystem.InternalCrsId)
xform = core.QgsCoordinateTransform(self.crs(), crs)
self.symbol.startRender(renderContext)
for line in self.grid:
polyline = QtGui.QPolygonF()
for vertex in line:
end = mapToPixel.transform(xform.transform(vertex))
polyline.append(QtCore.QPointF(end.x(), end.y()))
if QGis.QGIS_VERSION_INT < 10800:
self.symbol.renderPolyline(polyline, renderContext)
else:
self.symbol.renderPolyline(polyline, None, renderContext)
self.symbol.stopRender(renderContext)
return True
def drawLabels(self, renderContext):
if self.draw_labels:
for feat in self.label_features:
self.label.renderLabel(renderContext, feat, False)
def generateGrid(self):
self.grid = []
baseVec = QgsVector(1.0, 0.0).rotateBy(math.radians(360.0 - self.baselineAngle)) * self.cellSizeX
perpVec = baseVec.perpVector().normal() * self.cellSizeY
# Generate horizontal lines as a piecewise curve.
for h in xrange(self.gridOffsetY, self.numCellsY + self.gridOffsetY + 1):
line = []
for l in xrange(self.gridOffsetX, self.numCellsX + self.gridOffsetX + 1):
bar = (perpVec * h) + (baseVec * l)
line.append(core.QgsPoint(self.origin.x() + bar.x, self.origin.y() + bar.y))
self.grid.append(line)
# Generate vertical lines as a piecewise curve.
for v in xrange(self.gridOffsetX, self.numCellsX + self.gridOffsetX + 1):
line = []
for l in xrange(self.gridOffsetY, self.numCellsY + self.gridOffsetY + 1):
bar = (baseVec * v) + (perpVec * l)
line.append(core.QgsPoint(self.origin.x() + bar.x, self.origin.y() + bar.y))
self.grid.append(line)
self.generateLabels()
lower_left = (baseVec * self.gridOffsetX) + (perpVec * self.gridOffsetY)
lower_right = lower_left + (baseVec * self.numCellsX)
upper_left = lower_left + (perpVec * self.numCellsY)
upper_right = lower_right + (perpVec * self.numCellsY)
minx = min(lower_left.x, min(lower_right.x, min(upper_left.x, upper_right.x)))
miny = min(lower_left.y, min(lower_right.y, min(upper_left.y, upper_right.y)))
maxx = max(lower_left.x, max(lower_right.x, max(upper_left.x, upper_right.x)))
maxy = max(lower_left.y, max(lower_right.y, max(upper_left.y, upper_right.y)))
self.setExtent(core.QgsRectangle(minx + self.origin.x(), miny + self.origin.y(), maxx + self.origin.x(), maxy + self.origin.y()))
def generateLabels(self):
self.label_features = []
baseVec = QgsVector(1.0, 0.0).rotateBy(math.radians(360.0 - self.baselineAngle)) * self.cellSizeX
halfBaseVec = baseVec / 2.0
perpVec = baseVec.perpVector().normal() * self.cellSizeY
halfPerpVec = perpVec / 2.0
# CRS coordinates.
if self.label_type == 0:
for cell in xrange(0, len(self.grid[0])):
feat = core.QgsFeature()
feat.addAttribute(0, cell)
self._setHorizontalLabelAttributes(feat, math.degrees(baseVec.angle()))
labelvalue = self.grid[0][cell].x()
if self.crs().geographicFlag():
showDegrees = True
if self.label_degrees_diff and cell > 0 and cell < len(self.grid[0]) - 1:
if labelvalue < 0.0:
lastLabelValue = self.grid[0][cell + 1].x()
else:
lastLabelValue = self.grid[0][cell - 1].x()
if (abs(lastLabelValue) // 1 == abs(labelvalue) // 1) and ((lastLabelValue < 0.0) == (labelvalue < 0.0)):
showDegrees = False
labeltext = self.formatLabel(labelvalue, '%e', showDegrees)
else:
labeltext = '{0:0.{precision}f}'.format(labelvalue, precision=self.label_precision)
feat.addAttribute(2, labeltext)
feat.setGeometry(core.QgsGeometry().fromPoint(self.grid[0][cell]))
self.label_features.append(feat)
for cell in xrange(0, len(self.grid[self.numCellsY + 1])):
feat = core.QgsFeature()
feat.addAttribute(0, cell)
self._setVerticalLabelAttributes(feat, math.degrees(baseVec.angle()))
labelvalue = self.grid[self.numCellsY + 1][cell].y()
if self.crs().geographicFlag():
showDegrees = True
if self.label_degrees_diff and cell > 0 and cell < len(self.grid[self.numCellsY + 1]) - 1:
if labelvalue < 0.0:
lastLabelValue = self.grid[self.numCellsY + 1][cell + 1].y()
else:
lastLabelValue = self.grid[self.numCellsY + 1][cell - 1].y()
if (abs(lastLabelValue) // 1 == abs(labelvalue) // 1) and ((lastLabelValue < 0.0) == (labelvalue < 0.0)):
showDegrees = False
labeltext = self.formatLabel(labelvalue, '%n', showDegrees)
else:
labeltext = '{0:0.{precision}f}'.format(labelvalue, precision=self.label_precision)
feat.addAttribute(2, labeltext)
feat.setGeometry(core.QgsGeometry().fromPoint(self.grid[self.numCellsY + 1][cell]))
self.label_features.append(feat)
elif self.label_type == 1:
# Cell coordinates.
for cell in xrange(0, len(self.grid[0]) - 1):
feat = core.QgsFeature()
feat.addAttribute(0, cell)
self._setHorizontalLabelAttributes(feat, math.degrees(baseVec.angle()))
# Labels representing CRS coordinates are placed in the centre of the cell.
p = core.QgsPoint(self.grid[0][cell].x() + halfBaseVec.x, self.grid[0][cell].y() + halfBaseVec.y)
feat.setGeometry(core.QgsGeometry().fromPoint(p))
self.label_features.append(feat)
for cell in xrange(0, len(self.grid[self.numCellsY + 1]) - 1):
feat = core.QgsFeature()
feat.addAttribute(0, cell)
self._setVerticalLabelAttributes(feat, math.degrees(baseVec.angle()))
p = core.QgsPoint(self.grid[self.numCellsY + 1][cell].x() + halfPerpVec.x, self.grid[self.numCellsY + 1][cell].y() + halfPerpVec.y)
feat.setGeometry(core.QgsGeometry().fromPoint(p))
self.label_features.append(feat)
elif self.label_type == 2:
# Grid reference - cell.
for celly in xrange(0, len(self.grid[self.numCellsY + 1]) - 1):
for cellx in xrange(0, len(self.grid[0]) - 1):
feat = core.QgsFeature()
feat.addAttribute(0, (celly * len(self.grid[0])) + cellx)
self._setHorizontalLabelAttributes(feat, math.degrees(baseVec.angle()))
labeltext = u'{0} {1}'.format(cellx, celly)
feat.addAttribute(2, labeltext)
# Labels representing CRS coordinates are placed in the centre of the cell.
px = core.QgsPoint(self.grid[0][cellx].x() + halfBaseVec.x, self.grid[0][cellx].y() + halfBaseVec.y)
py = core.QgsPoint(self.grid[self.numCellsY + 1][celly].x() + halfPerpVec.x, self.grid[self.numCellsY + 1][celly].y() + halfPerpVec.y)
pp = core.QgsPoint(px.x() + py.x(), px.y() + py.y())
feat.setGeometry(core.QgsGeometry().fromPoint(pp))
self.label_features.append(feat)
def _setHorizontalLabelAttributes(self, feature, angle):
if self.label_orientation == 0 or self.label_orientation == 3:
feature.addAttribute(1, angle)
feature.addAttribute(3, 'top')
feature.addAttribute(4, self.label_xoff_horizontal)
feature.addAttribute(5, self.label_xoff_vertical)
else:
feature.addAttribute(1, angle + 90.0)
feature.addAttribute(3, 'right')
feature.addAttribute(4, self.label_xoff_vertical)
feature.addAttribute(5, self.label_xoff_horizontal)
def _setVerticalLabelAttributes(self, feature, angle):
if self.label_orientation == 0 or self.label_orientation == 2:
feature.addAttribute(1, angle)
feature.addAttribute(3, 'right')
feature.addAttribute(4, self.label_yoff_horizontal)
feature.addAttribute(5, self.label_yoff_vertical)
else:
feature.addAttribute(1, angle + 90.0)
feature.addAttribute(3, 'bottom')
feature.addAttribute(4, self.label_yoff_vertical)
feature.addAttribute(5, self.label_yoff_horizontal)
def formatLabel(self, angleValue, hemisphere, showDegrees):
angle = Angle(angleValue)
labeltext = ''
if showDegrees:
sign, hemisphere = ('', hemisphere) if self.label_hemisphere else ('%g', '')
else:
sign = ''
hemisphere = ''
pad = '0' if self.label_leading_zeros else ''
if self.label_format == 0:
# Decimal degrees.
decimal = '.%{0}d'.format(self.label_precision) if self.label_precision > 0 else ''
if showDegrees:
labeltext = u'{0:{sign}%{pad}D\u00b0{decimal} {hemisphere}}'.format(angle, decimal=decimal, sign=sign, hemisphere=hemisphere, pad=pad)
else:
labeltext = u'{0:{sign}{decimal} {hemisphere}}'.format(angle, decimal=decimal, sign=sign, hemisphere=hemisphere)
elif self.label_format == 1:
# Degrees, decimal minutes.
decimal = '.%{0}m'.format(self.label_precision) if self.label_precision > 0 else ''
if showDegrees:
labeltext = u'{0:{sign}%{pad}D\u00b0 %{pad}M\'{decimal} {hemisphere}}'.format(angle, decimal=decimal, sign=sign, hemisphere=hemisphere, pad=pad)
else:
labeltext = u'{0:{sign}%{pad}M\'{decimal} {hemisphere}}'.format(angle, decimal=decimal, sign=sign, hemisphere=hemisphere, pad=pad)
elif self.label_format == 2:
# Degrees, minutes, decimal seconds.
decimal = '.%{0}s'.format(self.label_precision) if self.label_precision > 0 else ''
if showDegrees:
labeltext = u'{0:{sign}%{pad}D\u00b0 %{pad}M\' %{pad}S"{decimal} {hemisphere}}'.format(angle, decimal=decimal, sign=sign, hemisphere=hemisphere, pad=pad)
else:
labeltext = u'{0:{sign}%{pad}M\' %{pad}S"{decimal} {hemisphere}}'.format(angle, decimal=decimal, sign=sign, hemisphere=hemisphere, pad=pad)
return labeltext
def setCrs(self, crs):
core.QgsPluginLayer.setCrs(self, crs)
self.generateGrid()
self.setCacheImage(None)
self.emit(QtCore.SIGNAL('repaintRequested()'))
def readXml(self, node):
element = node.toElement()
org_x = float(element.attribute('origin_x', '0.0'))
org_y = float(element.attribute('origin_y', '0.0'))
self.origin = core.QgsPoint(org_x, org_y)
self.numCellsX = int(element.attribute('num_cells_x', '1'))
self.numCellsY = int(element.attribute('num_cells_y', '1'))
self.gridOffsetX = int(element.attribute('grid_offset_x', '0'))
self.gridOffsetY = int(element.attribute('grid_offset_y', '0'))
self.cellSizeX = float(element.attribute('cell_size_x', '10.0'))
self.cellSizeY = float(element.attribute('cell_size_y', '10.0'))
self.baselineAngle = float(element.attribute('baseline_angle', '0.0'))
labelElement = node.firstChildElement('label')
if labelElement is not None:
self.draw_labels = bool(labelElement.attribute('draw_labels', '0'))
self.label_type = int(labelElement.attribute('type', '0'))
self.label_precision = int(labelElement.attribute('precision', '0'))
self.label_orientation = int(labelElement.attribute('orientation', '0'))
self.label_format = int(labelElement.attribute('format', '0'))
self.label_hemisphere = bool(labelElement.attribute('hemisphere', 'true'))
self.label_xoff_horizontal = float(labelElement.attribute('xoff_horizontal', '0.0'))
self.label_xoff_vertical = float(labelElement.attribute('xoff_vertical', '0.0'))
self.label_yoff_horizontal = float(labelElement.attribute('yoff_horizontal', '0.0'))
self.label_yoff_vertical = float(labelElement.attribute('yoff_vertical', '0.0'))
self.label_leading_zeros = bool(labelElement.attribute('leading_zeros', 'true'))
self.label_degrees_diff = bool(labelElement.attribute('degrees_diff', 'false'))
attributesElement = labelElement.firstChildElement('labelattributes')
if attributesElement is not None:
self.label.readXML(attributesElement)
self.generateGrid()
self.readSymbology(node, None)
return True
def writeXml(self, node, doc):
element = node.toElement()
element.setAttribute('type', 'plugin')
element.setAttribute('name', GridPluginLayer.LAYER_TYPE);
# Custom properties.
element.setAttribute('origin_x', str(self.origin.x()))
element.setAttribute('origin_y', str(self.origin.y()))
element.setAttribute('num_cells_x', str(self.numCellsX))
element.setAttribute('num_cells_y', str(self.numCellsY))
element.setAttribute('grid_offset_x', str(self.gridOffsetX))
element.setAttribute('grid_offset_y', str(self.gridOffsetY))
element.setAttribute('cell_size_x', str(self.cellSizeX))
element.setAttribute('cell_size_y', str(self.cellSizeY))
element.setAttribute('baseline_angle', str(self.baselineAngle))
labelElement = doc.createElement('label')
labelElement.setAttribute('draw_labels', str(self.draw_labels))
labelElement.setAttribute('type', str(self.label_type))
labelElement.setAttribute('precision', str(self.label_precision))
labelElement.setAttribute('orientation', str(self.label_orientation))
labelElement.setAttribute('format', str(self.label_format))
labelElement.setAttribute('hemisphere', str(self.label_hemisphere))
labelElement.setAttribute('xoff_horizontal', str(self.label_xoff_horizontal))
labelElement.setAttribute('xoff_vertical', str(self.label_xoff_vertical))
labelElement.setAttribute('yoff_horizontal', str(self.label_yoff_horizontal))
labelElement.setAttribute('yoff_vertical', str(self.label_yoff_vertical))
labelElement.setAttribute('leading_zeros', str(self.label_leading_zeros))
labelElement.setAttribute('degrees_diff', str(self.label_degrees_diff))
self.label.writeXML(labelElement, doc)
node.appendChild(labelElement)
self.writeSymbology(node, doc, None)
return True
def readSymbology(self, node, errorMessage):
symbolElement = node.firstChildElement('symbol')
if symbolElement is not None and symbolElement.attribute('name') == 'grid_lines':
self.symbol = core.QgsSymbolLayerV2Utils.loadSymbol(symbolElement)
self.setCacheImage(None)
self.emit(QtCore.SIGNAL('repaintRequested()'))
return True
else:
return False
def writeSymbology(self, node, doc, errorMessage):
symbolElement = core.QgsSymbolLayerV2Utils.saveSymbol('grid_lines', self.symbol, doc, None)
node.appendChild(symbolElement)
return True
def showDialog(self):
dlg = GridPropertiesDialog(self)
dlg.show()
result = dlg.exec_()
if result == 1:
self.generateGrid()
self.setValid(True)
self.setCacheImage(None)
self.emit(QtCore.SIGNAL('repaintRequested()'))
else:
self.setValid(False)
def canvasClicked(self, point, button):
valid, xc, yc = self.pointToCell(point)
if valid:
QtGui.QMessageBox.warning(None, 'Foo', 'x: {0} y: {1}'.format(xc, yc))
def pointToCell(self, point):
s = math.sin(math.radians(self.baselineAngle))
c = math.cos(math.radians(self.baselineAngle))
proj = core.QgsProject.instance()
srid = proj.readNumEntry('SpatialRefSys', '/ProjectCRSID', 3452)[0]
crs = core.QgsCoordinateReferenceSystem(srid, core.QgsCoordinateReferenceSystem.InternalCrsId)
xform = core.QgsCoordinateTransform(crs, self.crs())
xpoint = xform.transform(point)
x = xpoint.x() - self.origin.x()
y = xpoint.y() - self.origin.y()
xc = int(math.floor((x * c / self.cellSizeX) - (y * s / self.cellSizeY)) - self.gridOffsetX)
yc = int(math.floor((x * s / self.cellSizeX) + (y * c / self.cellSizeY)) - self.gridOffsetY)
valid = xc >= 0 and yc >= 0 and xc < (self.numCellsX - self.gridOffsetX) and yc < (self.numCellsY - self.gridOffsetY)
return (valid, xc, yc)