1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
<html>
<head>
<title>A canvas globalCompositeOperation with shadow</title>
<script>
if (window.testRunner)
testRunner.dumpAsTextWithPixelResults();
var compositeTypes = [
'source-over', 'source-in', 'source-out', 'source-atop',
'destination-over', 'destination-in', 'destination-out', 'destination-atop',
'lighter', 'copy', 'xor', 'multiply', 'screen', 'overlay', 'darken',
'lighten', 'color-dodge', 'color-burn', 'hard-light', 'soft-light',
'difference', 'exclusion', 'hue', 'saturation', 'color', 'luminosity'
];
function draw(){
for (i=0;i<compositeTypes.length;i++){
var label = document.createTextNode(compositeTypes[i]);
document.getElementById('lab'+i).appendChild(label);
var canvas = document.getElementById('tut'+i);
canvas.width = 80;
canvas.height = 80;
var ctx = canvas.getContext('2d');
// draw rectangle
ctx.fillStyle = "#09f";
ctx.fillRect(5,5,45,45);
// set composite property
ctx.globalCompositeOperation = compositeTypes[i];
// draw rectangle with shadow
ctx.fillStyle = "#f30";
ctx.shadowColor = 'blue';
ctx.shadowBlur = 10;
ctx.shadowOffsetX = 10;
ctx.shadowOffsetY = -10;
ctx.fillRect(20,25,45,45);
}
}
</script>
<style type="text/css">
body { margin: 20px; font-family: arial,verdana,helvetica; background: #fff;}
h1 { font-size: 140%; font-weight:normal; color: #036; border-bottom: 1px solid #ccc; }
canvas { border: 2px solid #000; margin-bottom: 5px; }
td { padding: 4px; }
pre { float:left; display:block; background: rgb(238,238,238); border: 1px dashed #666; padding: 15px 20px; margin: 0 0 10px 0; }
</style>
</head>
<body onload="draw();">
<div>
<table>
<tr>
<td><canvas id="tut0"></canvas><br/><label id="lab0"></label></td>
<td><canvas id="tut1"></canvas><br/><label id="lab1"></label></td>
<td><canvas id="tut2"></canvas><br/><label id="lab2"></label></td>
<td><canvas id="tut3"></canvas><br/><label id="lab3"></label></td>
<td><canvas id="tut4"></canvas><br/><label id="lab4"></label></td>
<td><canvas id="tut5"></canvas><br/><label id="lab5"></label></td>
<td><canvas id="tut6"></canvas><br/><label id="lab6"></label></td>
</tr>
<tr>
<td><canvas id="tut7"></canvas><br/><label id="lab7"></label></td>
<td><canvas id="tut8"></canvas><br/><label id="lab8"></label></td>
<td><canvas id="tut9"></canvas><br/><label id="lab9"></label></td>
<td><canvas id="tut10"></canvas><br/><label id="lab10"></label></td>
<td><canvas id="tut11"></canvas><br/><label id="lab11"></label></td>
<td><canvas id="tut12"></canvas><br/><label id="lab12"></label></td>
<td><canvas id="tut13"></canvas><br/><label id="lab13"></label></td>
</tr>
<tr>
<td><canvas id="tut14"></canvas><br/><label id="lab14"></label></td>
<td><canvas id="tut15"></canvas><br/><label id="lab15"></label></td>
<td><canvas id="tut16"></canvas><br/><label id="lab16"></label></td>
<td><canvas id="tut17"></canvas><br/><label id="lab17"></label></td>
<td><canvas id="tut18"></canvas><br/><label id="lab18"></label></td>
<td><canvas id="tut19"></canvas><br/><label id="lab19"></label></td>
<td><canvas id="tut20"></canvas><br/><label id="lab20"></label></td>
</tr>
<tr>
<td><canvas id="tut21"></canvas><br/><label id="lab21"></label></td>
<td><canvas id="tut22"></canvas><br/><label id="lab22"></label></td>
<td><canvas id="tut23"></canvas><br/><label id="lab23"></label></td>
<td><canvas id="tut24"></canvas><br/><label id="lab24"></label></td>
<td><canvas id="tut25"></canvas><br/><label id="lab25"></label></td>
</tr>
</table>
</div>
</body>
</html>
|
