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92bd6665b1
This draws a unchanging part of the gradient on to another canvas. --HG-- extra : rebase_source : 57de827713cac43cf117da1d4dc95a29d0007987
37 lines
1.2 KiB
HTML
37 lines
1.2 KiB
HTML
<body bgcolor="orange">
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<canvas width="300" height="300" id="testcase-canvas" style="display:none"></canvas>
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<canvas width="300" height="300" id="testcase-canvas-dest"></canvas>
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<script>
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const kShadow = "rgba(00%, 0%, 0%, 1)";
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const kTransparent = "rgba(0%, 100%, 100%, 0.5)";
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var cx, g;
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cx = document.getElementById('testcase-canvas').getContext('2d');
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cx.fillStyle = kShadow;
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cx.fillRect(100, 50, 150, 50);
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g = cx.createLinearGradient(0, 50, 0, 0);
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g.addColorStop(0, kShadow);
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g.addColorStop(0.2, kTransparent);
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g.addColorStop(1, kTransparent);
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cx.fillStyle = g;
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cx.fillRect(100, 0, 150, 50);
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g = cx.createRadialGradient(100, 100, 50, 100, 100, 100);
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g.addColorStop(0, kShadow);
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g.addColorStop(0.2, kTransparent);
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g.addColorStop(1, kTransparent);
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cx.fillStyle = g;
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cx.beginPath();
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cx.arc(100, 100, 100, Math.PI * 0.5, Math.PI * 1.5);
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cx.fill();
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cx2 = document.getElementById('testcase-canvas-dest').getContext('2d');
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// draw a chunk of the gradients from above onto testcase-canvas-dest
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cx2.drawImage(document.getElementById('testcase-canvas'),45,20, 100,20 ,0,0, 100,20);
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</script>
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</window>
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