77 lines
1.9 KiB
TypeScript
77 lines
1.9 KiB
TypeScript
class Colour {
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public static readonly INHERIT: number = 0x40000000;
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public static readonly READABILITY_THRESHOLD: number = 186;
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public static readonly LUMINANCE_WEIGHT_RED: number = 0.299;
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public static readonly LUMINANCE_WEIGHT_GREEN: number = 0.587;
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public static readonly LUMINANCE_WEIGHT_BLUE: number = 0.114;
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public raw: number;
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public constructor(rawColour: number = 0)
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{
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this.raw = rawColour === null ? Colour.INHERIT : rawColour;
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}
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public static none(): Colour {
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return new Colour(Colour.INHERIT);
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}
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public get inherit(): boolean {
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return (this.raw & Colour.INHERIT) > 0;
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}
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public set inherit(inherit: boolean) {
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if (inherit) {
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this.raw |= Colour.INHERIT;
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} else {
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this.raw &= ~Colour.INHERIT;
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}
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}
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public get red(): number {
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return (this.raw >> 16) & 0xFF;
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}
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public set red(red: number) {
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red = red & 0xFF;
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this.raw &= ~0xFF0000;
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this.raw |= red << 16;
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}
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public get green(): number {
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return (this.raw >> 8) & 0xFF;
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}
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public set green(green: number) {
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green = green & 0xFF;
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this.raw &= ~0xFF00;
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this.raw |= green << 8;
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}
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public get blue(): number {
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return this.raw & 0xFF;
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}
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public set blue(blue: number) {
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blue = blue & 0xFF;
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this.raw &= ~0xFF;
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this.raw |= blue;
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}
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public get luminance(): number {
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return Colour.LUMINANCE_WEIGHT_RED * this.red
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+ Colour.LUMINANCE_WEIGHT_GREEN * this.green
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+ Colour.LUMINANCE_WEIGHT_BLUE * this.blue;
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}
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public get hex(): string
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{
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let hex: string = (this.raw & 0xFFFFFF).toString(16);
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if (hex.length < 6)
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for (let i = 0; i < 6 - hex.length; i++)
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hex = '0' + hex;
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return '#' + hex;
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}
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}
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