sprotty/src/utils/color.ts

A next-gen framework for graphical views

/********************************************************************************
 * Copyright (c) 2017-2018 TypeFox and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/

export interface RGBColor {
    red: number
    green: number
    blue: number
}

export function rgb(red: number, green: number, blue: number): RGBColor {
    return {
        red: red,
        green: green,
        blue: blue
    };
}

export function toSVG(c: RGBColor): string {
    return 'rgb(' + c.red + ',' + c.green + ',' + c.blue + ')';
}

export class ColorMap {

    constructor(protected stops: RGBColor[]) {
    }

    getColor(t: number): RGBColor {
        t = Math.max(0, Math.min(0.99999999, t));
        const i = Math.floor(t * this.stops.length);
        return this.stops[i];
    }
}