53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
/* eslint-disable no-magic-numbers */
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import { num_to_hex } from '@scode/encoding-helper';
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export class Color {
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public static readonly black = new Color (0, 0, 0);
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public static readonly red = new Color (255, 0, 0);
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public static readonly green = new Color (0, 255, 0);
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public static readonly yellow = new Color (255, 255, 0);
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public static readonly blue = new Color (0, 0, 255);
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public static readonly magenta = new Color (255, 0, 255);
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public static readonly cyan = new Color (0, 255, 255);
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public static readonly white = new Color (255, 255, 255);
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public static readonly transparent = new Color (0, 0, 0, 0);
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public static readonly gray = new Color (128, 128, 128);
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private red: number;
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private green: number;
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private blue: number;
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private alpha: number;
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private check_range (n: number): void {
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if (n < 0 || n > 255)
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throw new Error ('number out of range');
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}
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public constructor (red: number, green: number, blue: number, alpha = 255) {
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this.check_range (red);
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this.check_range (green);
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this.check_range (blue);
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this.check_range (alpha);
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this.red = red;
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this.green = green;
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this.blue = blue;
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this.alpha = alpha;
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}
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// eslint-disable-next-line @typescript-eslint/naming-convention
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public toString (): string {
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return `#${num_to_hex (
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this.red,
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2
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)}${num_to_hex (
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this.green,
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2
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)}${num_to_hex (
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this.blue,
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2
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)}${this.alpha === 255
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? ''
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: num_to_hex (this.alpha, 2)}`;
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}
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}
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