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| 1 <!DOCTYPE html> |
| 2 <html> |
| 3 <body> |
| 4 <canvas id ='output' width='500' height='500'></canvas> |
| 5 <script> |
| 6 var aCanvas = document.getElementById('output'); |
| 7 var ctx = aCanvas.getContext('2d'); |
| 8 |
| 9 var fillShape = function(x, y) { |
| 10 ctx.beginPath(); |
| 11 ctx.arc(x, y, 100, 0, Math.PI*2, true); |
| 12 ctx.arc(x, y, 50, 0, Math.PI*2, false); |
| 13 ctx.fill(); |
| 14 }; |
| 15 |
| 16 var gradient = ctx.createLinearGradient(0, 0, 300, 0); |
| 17 gradient.addColorStop(0, 'rgba(0, 0, 255, 0.5)'); |
| 18 gradient.addColorStop(1, 'rgba(0, 0, 255, 0.5)'); |
| 19 |
| 20 ctx.save(); |
| 21 ctx.fillStyle = gradient; |
| 22 ctx.shadowColor = 'rgba(255, 0, 0, 0.5)'; |
| 23 ctx.shadowOffsetX = 250; |
| 24 |
| 25 // Alpha shadow. |
| 26 ctx.shadowBlur = 0; |
| 27 fillShape(150, 150); |
| 28 |
| 29 // Blurry shadow. |
| 30 ctx.shadowBlur = 10; |
| 31 fillShape(150, 400); |
| 32 |
| 33 ctx.restore(); |
| 34 </script> |
| 35 </body> |
| 36 </html> |
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