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| 1 <html> |
| 2 <body> |
| 3 <canvas id="c1" width="250" height="250"></canvas> |
| 4 <canvas id="c2" width="250" height="250"></canvas> |
| 5 <br> |
| 6 <canvas id="c3" width="250" height="250"></canvas> |
| 7 <canvas id="c4" width="250" height="250"></canvas> |
| 8 <script type="text/javascript"> |
| 9 var canvas1 = document.getElementById('c1'); |
| 10 var canvas2 = document.getElementById('c2'); |
| 11 var canvas3 = document.getElementById('c3'); |
| 12 var canvas4 = document.getElementById('c4'); |
| 13 var bgcanvas = document.createElement('canvas'); |
| 14 bgcanvas.width = 100; |
| 15 bgcanvas.height = 100; |
| 16 var bgctx = bgcanvas.getContext('2d'); |
| 17 bgctx.fillStyle = 'green'; |
| 18 bgctx.fillRect(0, 0, bgcanvas.width, bgcanvas.height); |
| 19 |
| 20 var bgcanvasLowerRight = document.createElement('canvas'); |
| 21 bgcanvasLowerRight.width = 100; |
| 22 bgcanvasLowerRight.height = 100; |
| 23 var bgctxLowerRight = bgcanvasLowerRight.getContext('2d'); |
| 24 bgctxLowerRight.fillStyle = 'green'; |
| 25 bgctxLowerRight.fillRect(bgcanvasLowerRight.width/2, bgcanvasLowerRight.height/2
, bgcanvasLowerRight.width/2, bgcanvasLowerRight.height/2); |
| 26 |
| 27 var bgcanvasUpperLeft = document.createElement('canvas'); |
| 28 bgcanvasUpperLeft.width = 100; |
| 29 bgcanvasUpperLeft.height = 100; |
| 30 var bgctxUpperLeft = bgcanvasUpperLeft.getContext('2d'); |
| 31 bgctxUpperLeft.fillStyle = 'green'; |
| 32 bgctxUpperLeft.fillRect(0, 0, bgcanvasUpperLeft.width/2, bgcanvasUpperLeft.heigh
t/2); |
| 33 |
| 34 var bgcanvasCenter = document.createElement('canvas'); |
| 35 bgcanvasCenter.width = 300; |
| 36 bgcanvasCenter.height = 300; |
| 37 var bgctxCenter = bgcanvasCenter.getContext('2d'); |
| 38 bgctxCenter.fillStyle = 'green'; |
| 39 bgctxCenter.fillRect(100, 100, 100, 100); |
| 40 |
| 41 var ctx1 = canvas1.getContext('2d'); |
| 42 var ctx2 = canvas2.getContext('2d'); |
| 43 var ctx3 = canvas3.getContext('2d'); |
| 44 var ctx4 = canvas4.getContext('2d'); |
| 45 |
| 46 var srcCanvases = [bgcanvas, bgcanvasLowerRight, bgcanvasUpperLeft, bgcanvasCent
er]; |
| 47 var dstCtxs = [ctx1, ctx2, ctx3, ctx4]; |
| 48 |
| 49 for (var i = 0; i < dstCtxs.length; ++i) { |
| 50 var srcCanvas = srcCanvases[i]; |
| 51 var ctx = dstCtxs[i]; |
| 52 ctx.drawImage(srcCanvas, -100, -100, 300, 300, -25, -25, 300, 300); |
| 53 ctx.drawImage(srcCanvas, -100, -100, 200, 200, -25, -25, 100, 100); |
| 54 ctx.drawImage(srcCanvas, 0, -100, 100, 200, 75, -25, 100, 100); |
| 55 ctx.drawImage(srcCanvas, 0, -100, 200, 200, 175, -25, 100, 100); |
| 56 ctx.drawImage(srcCanvas, -100, 0, 200, 100, -25, 75, 100, 100); |
| 57 ctx.drawImage(srcCanvas, 0, 0, 200, 100, 175, 75, 100, 100); |
| 58 ctx.drawImage(srcCanvas, -100, 0, 200, 200, -25, 175, 100, 100); |
| 59 ctx.drawImage(srcCanvas, 0, 0, 100, 200, 75, 175, 100, 100); |
| 60 ctx.drawImage(srcCanvas, 0, 0, 200, 200, 175, 175, 100, 100); |
| 61 } |
| 62 |
| 63 </script> |
| 64 </body></html> |
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