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1 <!DOCTYPE html> | |
2 <html> | |
3 <head> | |
4 <style> | |
5 canvas { display: inline-block; } | |
6 </style> | |
7 </head> | |
8 <body> | |
9 <canvas id="source-over" width="80" height="80"></canvas> | |
10 <canvas id="source-in" width="80" height="80"></canvas> | |
11 <canvas id="source-out" width="80" height="80"></canvas> | |
12 <canvas id="source-atop" width="80" height="80"></canvas> | |
13 <br> | |
14 <canvas id="destination-over" width="80" height="80"></canvas> | |
15 <canvas id="destination-in" width="80" height="80"></canvas> | |
16 <canvas id="destination-out" width="80" height="80"></canvas> | |
17 <canvas id="destination-atop" width="80" height="80"></canvas> | |
18 <br> | |
19 <canvas id="lighter" width="80" height="80"></canvas> | |
20 <canvas id="xor" width="80" height="80"></canvas> | |
21 <script> | |
22 var compositeOps = [ | |
23 'source-over', | |
24 'source-in', | |
25 'source-out', | |
26 'source-atop', | |
27 'destination-over', | |
28 'destination-in', | |
29 'destination-out', | |
30 'destination-atop', | |
31 'lighter', | |
32 'xor' | |
33 ]; | |
34 | |
35 for (var i = 0; i < compositeOps.length; i++) { | |
36 var op = compositeOps[i]; | |
37 var ctx = document.getElementById(op).getContext('2d'); | |
38 ctx.fillStyle = 'red'; | |
39 ctx.fillRect(5, 5, 40, 40); | |
40 | |
41 ctx.globalCompositeOperation = op; | |
42 | |
43 ctx.fillStyle = 'deepskyblue'; | |
44 ctx.beginPath(); | |
45 ctx.arc(45,45,20,0,Math.PI*2,true); | |
46 ctx.fill(); | |
47 } | |
48 </script> | |
49 </body> | |
50 </html> | |
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