Kirubel-Kibru-Yaltopia
d261148b35
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39 lines
1.0 KiB
TypeScript
39 lines
1.0 KiB
TypeScript
import { createRng } from "@/lib/voronoi-mesh";
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/** Organic contour paths for light backgrounds (topographic wave lines). */
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export function buildWavyContourPaths(
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lineCount: number,
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width: number,
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height: number,
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seed: number
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): string[] {
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const rng = createRng(seed);
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const paths: string[] = [];
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for (let i = 0; i < lineCount; i++) {
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const yBase = ((i + 0.5) / lineCount) * height;
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const amp = 2 + rng() * 4.5;
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const freq1 = 0.035 + rng() * 0.038;
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const freq2 = 0.008 + rng() * 0.014;
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const phase1 = rng() * Math.PI * 2;
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const phase2 = rng() * Math.PI * 2;
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const drift = (rng() - 0.5) * 3;
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const steps = 80;
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let d = "";
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for (let s = 0; s <= steps; s++) {
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const x = (s / steps) * width;
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const y =
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yBase +
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drift * (x / width - 0.5) +
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amp * Math.sin(x * freq1 + phase1) +
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amp * 0.42 * Math.sin(x * freq2 + phase2);
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d += s === 0 ? `M ${x.toFixed(2)} ${y.toFixed(2)}` : ` L ${x.toFixed(2)} ${y.toFixed(2)}`;
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}
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paths.push(d);
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}
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return paths;
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}
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