73 lines
1.8 KiB
TypeScript
73 lines
1.8 KiB
TypeScript
export function getRandomColor(): string {
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const { r, g, b } = getColorRgbFromHue(Math.random());
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return toHexa(r, g, b);
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}
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function toHexa(r: number, g: number, b: number): string {
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return "#" + Math.floor(r * 256).toString(16) + Math.floor(g * 256).toString(16) + Math.floor(b * 256).toString(16);
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}
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export function getColorRgbFromHue(hue: number): { r: number; g: number; b: number } {
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const golden_ratio_conjugate = 0.618033988749895;
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hue += golden_ratio_conjugate;
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hue %= 1;
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return hsv_to_rgb(hue, 0.5, 0.95);
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}
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function stringToDouble(string: string): number {
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let num = 1;
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for (const char of string.split("")) {
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num *= char.charCodeAt(0);
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}
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return (num % 255) / 255;
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}
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//todo: test this.
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function hsv_to_rgb(hue: number, saturation: number, brightness: number): { r: number; g: number; b: number } {
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const h_i = Math.floor(hue * 6);
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const f = hue * 6 - h_i;
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const p = brightness * (1 - saturation);
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const q = brightness * (1 - f * saturation);
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const t = brightness * (1 - (1 - f) * saturation);
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let r: number, g: number, b: number;
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switch (h_i) {
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case 0:
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r = brightness;
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g = t;
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b = p;
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break;
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case 1:
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r = q;
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g = brightness;
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b = p;
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break;
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case 2:
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r = p;
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g = brightness;
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b = t;
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break;
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case 3:
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r = p;
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g = q;
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b = brightness;
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break;
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case 4:
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r = t;
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g = p;
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b = brightness;
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break;
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case 5:
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r = brightness;
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g = p;
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b = q;
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break;
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default:
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throw "h_i cannot be " + h_i;
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}
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return {
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r,
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g,
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b,
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};
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}
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