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56 lines
2.3 KiB
HTML
56 lines
2.3 KiB
HTML
<h1>Canvas Patterns</h1>
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<em>Canvas pattern: Repeat (heart)</em><br><code>ctx.createPattern(img, "repeat")</code><br>
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<canvas id="canvas-0" width="230" height="210"></canvas><br><br>
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<em>Canvas pattern: Repeat</em><br><code>ctx.createPattern(img, "repeat")</code><br>
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<canvas id="canvas-1" width="400" height="300"></canvas><br><br>
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<em>Canvas pattern: Repeat</em><br><code>ctx.createPattern(img, "repeat-x")</code><br>
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<canvas id="canvas-2" width="400" height="300"></canvas><br><br>
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<em>Canvas pattern: Repeat</em><br><code>ctx.createPattern(img, "repeat-y")</code><br>
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<canvas id="canvas-3" width="400" height="300"></canvas><br><br>
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<em>Canvas pattern: Repeat</em><br><code>ctx.createPattern(img, "no-repeat")</code><br>
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<canvas id="canvas-4" width="400" height="300"></canvas>
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<style>
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canvas {
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border: 1px solid black;
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}
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</style>
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<script>
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const img = new Image();
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img.src = "car.png";
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img.onload = () => {
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const heartDemo = (canvasId) => {
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const canvas = document.getElementById(canvasId);
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const ctx = canvas.getContext("2d");
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const pattern = ctx.createPattern(img, "repeat");
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const scale = 1.5
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const scaleValues = l =>l.map(value => value * scale);
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ctx.fillStyle = pattern;
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// Heart path taken from: https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Drawing_shapes
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ctx.beginPath();
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ctx.moveTo(...scaleValues([75, 40]));
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ctx.bezierCurveTo(...scaleValues([75, 37, 70, 25, 50, 25]));
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ctx.bezierCurveTo(...scaleValues([20, 25, 20, 62.5, 20, 62.5]));
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ctx.bezierCurveTo(...scaleValues([20, 80, 40, 102, 75, 120]));
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ctx.bezierCurveTo(...scaleValues([110, 102, 130, 80, 130, 62.5]));
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ctx.bezierCurveTo(...scaleValues([130, 62.5, 130, 25, 100, 25]));
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ctx.bezierCurveTo(...scaleValues([85, 25, 75, 37, 75, 40]));
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ctx.fill();
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}
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const makePatternDemo = (canvasId, repeat) => {
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const canvas = document.getElementById(canvasId);
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const ctx = canvas.getContext("2d");
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const pattern = ctx.createPattern(img, repeat);
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ctx.fillStyle = pattern;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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}
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heartDemo("canvas-0")
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makePatternDemo("canvas-1", "repeat");
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makePatternDemo("canvas-2", "repeat-x");
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makePatternDemo("canvas-3", "repeat-y");
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makePatternDemo("canvas-4", "no-repeat");
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};
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</script>
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