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https://gitlab.com/harald.mueller/aktuelle.kurse.git
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52 lines
1.0 KiB
HTML
52 lines
1.0 KiB
HTML
<!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;
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let ctx;
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let strokeColor = "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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x++;
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if (x > rectSize){
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x = 0;
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if (strokeColor == "black") { strokeColor = "yellow"; } else { strokeColor = "black"; }
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ctx.strokeStyle = strokeColor;
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}
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}
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function zeichne()
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{
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ctx.fillStyle = "red";
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ctx.fillRect(0, 0, rectSize, rectSize);
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x = 0;
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strokeColor = "black";
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window.setInterval(zeichneLinie, callIntervalMs);
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}
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let cv = document.getElementById("myCanvas");
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if (cv.getContext){
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ctx = cv.getContext("2d");
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zeichne();
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} else {
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alert("Der Browser unterstützt das <canvas>-Element nicht :-(");
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}
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</script>
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</body>
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</html>
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