| <html> |
| <head> |
| <title>A canvas globalCompositeOperation example</title> |
| <meta name="DC.creator" content="Kamiel Martinet, http://www.martinet.nl/"> |
| <meta name="DC.publisher" content="Mozilla Developer Center, http://developer.mozilla.org"> |
| <script type="application/x-javascript"> |
| if (window.testRunner) |
| testRunner.dumpAsText(true); |
| |
| var compositeTypes = [ |
| 'source-over','source-in','source-out','source-atop', |
| 'destination-over','destination-in','destination-out','destination-atop', |
| 'lighter','darker','copy','xor' |
| ]; |
| function draw(){ |
| for (i=0;i<compositeTypes.length;i++){ |
| var label = document.createTextNode(compositeTypes[i]); |
| document.getElementById('lab'+i).appendChild(label); |
| var ctx = document.getElementById('tut'+i).getContext('2d'); |
| |
| // draw rectangle |
| ctx.fillStyle = "#09f"; |
| ctx.fillRect(15,15,70,70); |
| |
| // set composite property |
| ctx.globalCompositeOperation = compositeTypes[i]; |
| |
| // draw circle |
| ctx.fillStyle = "#f30"; |
| ctx.beginPath(); |
| ctx.arc(75,75,35,0,Math.PI*2,true); |
| ctx.fill(); |
| } |
| } |
| </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: 7px; } |
| 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" width="125" height="125"></canvas><br/><label id="lab0"></label></td> |
| <td><canvas id="tut1" width="125" height="125"></canvas><br/><label id="lab1"></label></td> |
| <td><canvas id="tut2" width="125" height="125"></canvas><br/><label id="lab2"></label></td> |
| <td><canvas id="tut3" width="125" height="125"></canvas><br/><label id="lab3"></label></td> |
| </tr> |
| <tr> |
| <td><canvas id="tut4" width="125" height="125"></canvas><br/><label id="lab4"></label></td> |
| <td><canvas id="tut5" width="125" height="125"></canvas><br/><label id="lab5"></label></td> |
| <td><canvas id="tut6" width="125" height="125"></canvas><br/><label id="lab6"></label></td> |
| <td><canvas id="tut7" width="125" height="125"></canvas><br/><label id="lab7"></label></td> |
| </tr> |
| <tr> |
| <td><canvas id="tut8" width="125" height="125"></canvas><br/><label id="lab8"></label></td> |
| <td><canvas id="tut9" width="125" height="125"></canvas><br/><label id="lab9"></label></td> |
| <td><canvas id="tut10" width="125" height="125"></canvas><br/><label id="lab10"></label></td> |
| <td><canvas id="tut11" width="125" height="125"></canvas><br/><label id="lab11"></label></td> |
| </tr> |
| </table> |
| </div> |
| </body> |
| </html> |
