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35 lines
1.0 KiB
TypeScript
35 lines
1.0 KiB
TypeScript
// hidden-start
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import {VictoryChart} from "victory";
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import {camera, histIndex} from "../src/camera";
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// hidden-end
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export class PlotHistogram {
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public readonly pixels: Uint32Array;
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public constructor(private readonly width: number, height: number) {
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this.pixels = new Uint32Array(width * height);
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}
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public plot(x: number, y: number) {
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const [pixelX, pixelY] = camera(x, y, this.width);
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const pixelIndex = histIndex(pixelX, pixelY, this.width, 1);
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this.pixels[pixelIndex] += 1;
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}
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public getHistogram() {
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const data = new Map<number, number>();
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this.pixels.forEach(value => {
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const bucket = 32 - Math.clz32(value);
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if (bucket in data) {
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data[bucket] += 1;
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} else {
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data[bucket] = 1;
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}
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})
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const output: {x: number, y: number}[] = [];
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data.forEach((bucket, value) =>
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output.push({x: Math.pow(bucket, 2), y: value}));
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return output;
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}
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} |