mirror of
https://gitlab.com/harald.mueller/aktuelle.kurse.git
synced 2024-11-28 12:41:57 +01:00
54 lines
1.1 KiB
HTML
54 lines
1.1 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>Canvas</title>
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</head>
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<body>
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<h1>HTML5 Canvas</h1>
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<canvas id="myCanvas" width="300" height="500"/>
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<script>
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const rectSize = 200;
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const callIntervalMs = 10;
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let x = 0;
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let change = 1;
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let ctx;
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let strokeStyle = "black";
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function zeichneLinie()
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{
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ctx.beginPath();
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ctx.moveTo(x, 0);
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ctx.lineTo(rectSize-x, rectSize);
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ctx.stroke();
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}
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function zeichne()
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{
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ctx = document.getElementById("myCanvas").getContext("2d");
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ctx.clearRect(0, 0, rectSize, rectSize);
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ctx.fillStyle = "green";
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ctx.strokeStyle = "blue";
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ctx.lineWidth = 5;
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ctx.save();
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ctx.fillRect(0, 0, rectSize, rectSize);
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x += change;
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if (x > rectSize || x < 0){
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change = -change;
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if (strokeStyle == "black") { strokeStyle = "yellow"; } else { strokeStyle = "black"; }
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ctx.strokeStyle = strokeStyle;
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}
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zeichneLinie();
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window.requestAnimationFrame(zeichne);
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}
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zeichne();
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</script>
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</body>
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</html>
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