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anim.js split as a separated lib #16

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174d386
anim.js split as a separated lib
Kronuz Apr 21, 2015
f6539b6
Javascript animation library tweaks and cleanups
Kronuz Apr 23, 2015
6ce035d
HTML simplified
Kronuz Apr 23, 2015
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153 changes: 153 additions & 0 deletions anim.js
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Original file line number Diff line number Diff line change
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(function(exports) {
"use strict";

var delay_scale = 0.7;
var timer = null;

var animate = function(img, timeline, element, ratio) {
var run_time = 0,
i = 0,
j;

for (j = 0; j < timeline.length - 1; ++j) {
run_time += timeline[j].delay;
}

var f = function() {
var frame = i++ % timeline.length,
delay = timeline[frame].delay * delay_scale,
blits = timeline[frame].blit,
ctx = element.getContext('2d');

for (j = 0; j < blits.length; ++j) {
var blit = blits[j],
sx = blit[0] * ratio,
sy = blit[1] * ratio,
w = blit[2] * ratio,
h = blit[3] * ratio,
dx = blit[4] * ratio,
dy = blit[5] * ratio;

ctx.drawImage(img, sx, sy, w, h, dx, dy, w, h);
}

timer = window.setTimeout(f, delay);
};

if (timer) window.clearTimeout(timer);
f();
};

var animate_fallback = function(img, timeline, element, ratio) {
var run_time = 0,
i = 0,
j;

for (j = 0; j < timeline.length - 1; ++j) {
run_time += timeline[j].delay;
}

var f = function() {
if (i % timeline.length === 0) {
while (element.hasChildNodes()) {
element.removeChild(element.lastChild);
}
}

var frame = i++ % timeline.length,
delay = timeline[frame].delay * delay_scale,
blits = timeline[frame].blit;

for (j = 0; j < blits.length; ++j) {
var blit = blits[j],
sx = blit[0],
sy = blit[1],
w = blit[2],
h = blit[3],
dx = blit[4],
dy = blit[5];

var d = document.createElement('div');
d.style.position = 'absolute';
d.style.left = dx + "px";
d.style.top = dy + "px";
d.style.width = w + "px";
d.style.height = h + "px";
d.style.backgroundImage = "url('" + img.src + "')";
d.style.backgroundSize = (img.width / ratio) + "px " + (img.height / ratio) + "px";
d.style.backgroundPosition = "-" + sx + "px -" + sy + "px";

element.appendChild(d);
}

timer = window.setTimeout(f, delay);
};

if (timer) window.clearTimeout(timer);
f();
};

exports.set_animation = function(img_url, timeline, canvas_id, fallback_id) {
var i, j,
auto = 1,
devicePixelRatio = !auto || window.devicePixelRatio || 1,
width = 0,
height = 0,
img = new Image(),
final_img_url;
// Find out what is the biggest blit:
for (i = 0; i< timeline.length; i++) {
for (j = 0; j < timeline[i].blit.length; j++) {
var blit = timeline[i].blit[j],
_width = blit[2] + blit[4],
_height = blit[3] + blit[5];
if (width < _width) width = _width;
if (height < _height) height = _height;
}
}
img.onload = function() {
var canvas = document.getElementById(canvas_id);
if (canvas && canvas.getContext) {
var ctx = canvas.getContext('2d'),
backingStoreRatio = !auto ||
ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1,
ratio = devicePixelRatio / backingStoreRatio;
canvas.width = width * ratio;
canvas.height = height * ratio;
canvas.style.width = width + 'px';
canvas.style.height = height + 'px';
// ctx.scale(ratio, ratio);
animate(img, timeline, canvas, ratio);
} else {
var element = document.getElementById(fallback_id);
element.style.width = width + 'px';
element.style.height = height + 'px';
element.style.position = 'relative';
animate_fallback(img, timeline, element, devicePixelRatio);
}
};

img.onerror = function() {
if (devicePixelRatio != 1) {
devicePixelRatio = 1;
final_img_url = img_url;
auto = 0;
img.src = final_img_url;
}
};

if (devicePixelRatio != 1) {
var retinaImageSuffix = '@' + devicePixelRatio + 'x',
regexMatch = /\.\w+$/;
final_img_url = img_url.replace(regexMatch, function(match) { return retinaImageSuffix + match; });
} else {
final_img_url = img_url;
}
img.src = final_img_url;
};

})(window);
109 changes: 3 additions & 106 deletions example.html
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Original file line number Diff line number Diff line change
Expand Up @@ -2,121 +2,18 @@
<html>

<head>
<script type="text/javascript" src="anim.js"></script>
<script type="text/javascript" src="example_anim.js"></script>
<script type="text/javascript">
var delay_scale = 0.7
var timer = null

var animate = function(img, timeline, element)
{
var i = 0

var run_time = 0
for (var j = 0; j < timeline.length - 1; ++j)
run_time += timeline[j].delay

var f = function()
{
var frame = i++ % timeline.length
var delay = timeline[frame].delay * delay_scale
var blits = timeline[frame].blit

var ctx = element.getContext('2d')

for (j = 0; j < blits.length; ++j)
{
var blit = blits[j]
var sx = blit[0]
var sy = blit[1]
var w = blit[2]
var h = blit[3]
var dx = blit[4]
var dy = blit[5]
ctx.drawImage(img, sx, sy, w, h, dx, dy, w, h)
}

timer = window.setTimeout(f, delay)
}

if (timer) window.clearTimeout(timer)
f()
}

var animate_fallback = function(img, timeline, element)
{
var i = 0

var run_time = 0
for (var j = 0; j < timeline.length - 1; ++j)
run_time += timeline[j].delay

var f = function()
{
if (i % timeline.length == 0)
{
while (element.hasChildNodes())
element.removeChild(element.lastChild)
}

var frame = i++ % timeline.length
var delay = timeline[frame].delay * delay_scale
var blits = timeline[frame].blit

for (j = 0; j < blits.length; ++j)
{
var blit = blits[j]
var sx = blit[0]
var sy = blit[1]
var w = blit[2]
var h = blit[3]
var dx = blit[4]
var dy = blit[5]

var d = document.createElement('div')
d.style.position = 'absolute'
d.style.left = dx + "px"
d.style.top = dy + "px"
d.style.width = w + "px"
d.style.height = h + "px"
d.style.backgroundImage = "url('" + img.src + "')"
d.style.backgroundPosition = "-" + sx + "px -" + sy + "px"

element.appendChild(d)
}

timer = window.setTimeout(f, delay)
}

if (timer) window.clearTimeout(timer)
f()
}

function set_animation(img_url, timeline, canvas_id, fallback_id)
{
var img = new Image()
img.onload = function()
{
var canvas = document.getElementById(canvas_id)
if (canvas && canvas.getContext)
animate(img, timeline, canvas)
else
animate_fallback(img, timeline, document.getElementById(fallback_id))
}
img.src = img_url
}
</script>
</head>

<body>

<p>Example Animation. Please ensure you've run anim_encoder.py to generate the required data.

<div><canvas id="anim_target" class="anim_target" width="800" height="450">
<div id="anim_fallback" class="anim_target" style="width: 800px; height: 450px; position: relative;"></div>
<p></canvas></div>
<div id="anim_fallback" class="anim_target"><canvas id="anim_target" class="anim_target"></canvas></div>

<script>
set_animation("example_packed.png", example_timeline, 'anim_target', 'anim_fallback');
set_animation("example_packed.png", example_timeline, 'anim_target', 'anim_fallback');
</script>

</body>