mirror of
https://github.com/RGBCube/serenity
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38 lines
1.3 KiB
HTML
38 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>Trigonometry</title>
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<style type="text/css">
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canvas {
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border-width: 1px;
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border-style: solid;
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border-color: #000;
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}
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</style>
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<script>
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document.addEventListener("DOMContentLoaded", function () {
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var functions = ["sin", "cos", "tan"];
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for (var i = 0; i < functions.length; ++i) {
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var func = functions[i];
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var canvas = document.getElementById(func);
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var ctx = canvas.getContext("2d");
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for (var x = 0; x < canvas.width; ++x) {
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var y = -Math[func](x / 20) * canvas.height / 4 + canvas.height / 2;
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ctx.fillStyle = "red";
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ctx.fillRect(x-1, y-1, 2, 2);
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ctx.fillStyle = "black";
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ctx.fillRect(x, canvas.height / 2, 1, 1);
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}
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}
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});
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</script>
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</head>
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<body>
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<h1>Sine</h1>
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<canvas id="sin" width="300" height="100"></canvas>
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<h1>Cosine</h1>
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<canvas id="cos" width="300" height="100"></canvas>
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<h1>Tangent</h1>
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<canvas id="tan" width="300" height="100"></canvas>
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</body>
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</html>
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