42 lines
1.3 KiB
JavaScript
42 lines
1.3 KiB
JavaScript
"use strict"
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const Vec2 = {
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add({x:x1, y:y1}, {x:x2, y:y2}) {
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return Object.freeze({x:x1+x2, y:y1+y2})
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},
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avg({x:x1, y:y1}, {x:x2, y:y2}) {
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return Object.freeze({x:(x1+x2)/2, y:(y1+y2)/2})
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},
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fromPolar({x,y}, radius, angle) {
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return Object.freeze({x: x + radius * Math.cos(angle),
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y: y + radius * Math.sin(angle)})
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},
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sub({x:x1, y:y1}, {x:x2, y:y2}) {
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return Object.freeze({x:x1-x2, y: y1-y2})
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},
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distLess(a, b, radius) {
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const {x, y} = Vec2.sub(a, b)
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return ((x*x) + (y*y)) < (radius * radius)
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},
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zero: Object.freeze({x:0, y:0})
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};
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function drawVertices(context, vertices, draw=true, close=true) {
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if (draw) context.beginPath();
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context.moveTo(vertices[0].x, vertices[0].y);
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vertices.slice(1).forEach(({x, y}) =>
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context.lineTo(x, y))
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if (close) context.lineTo(vertices[0].x, vertices[0].y);
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if (draw) context.stroke();
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}
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function convrgb(values) {
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return 'rgb(' + values.map(x=>x|0).join(', ') + ')';
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};
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// apply mild noise on the sensor reading, and clamp between valid values
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function gaussNoise(sigma=1) {
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const x0 = 1.0 - Math.random();
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const x1 = 1.0 - Math.random();
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return sigma * Math.sqrt(-2 * Math.log(x0)) * Math.cos(2 * Math.PI * x1);
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};
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