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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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