webglimpse/esm2020/webglimpse/color.mjs

Webglimpse is a data visualization library for the web.

/*
 * Copyright (c) 2014, Metron, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
import { hasval } from './util/util';
export class Color {
    constructor(r, g, b, a = 1) {
        this._r = r;
        this._g = g;
        this._b = b;
        this._a = a;
    }
    get r() { return this._r; }
    get g() { return this._g; }
    get b() { return this._b; }
    get a() { return this._a; }
    get cssString() {
        return 'rgba(' + Math.round(255 * this._r) + ',' + Math.round(255 * this._g) + ',' + Math.round(255 * this._b) + ',' + this._a + ')';
    }
    get rgbaString() {
        return '' + Math.round(255 * this._r) + ',' + Math.round(255 * this._g) + ',' + Math.round(255 * this._b) + ',' + Math.round(255 * this._a);
    }
    withAlphaTimes(aFactor) {
        return new Color(this._r, this._g, this._b, aFactor * this._a);
    }
}
export function darker(color, factor) {
    return new Color(color.r * factor, color.g * factor, color.b * factor, color.a);
}
export function rgba(r, g, b, a) {
    return new Color(r, g, b, a);
}
export function rgb(r, g, b) {
    return new Color(r, g, b, 1);
}
export function sameColor(c1, c2) {
    if (c1 === c2) {
        return true;
    }
    if (!hasval(c1) || !hasval(c2)) {
        return false;
    }
    return (c1.r === c2.r && c1.g === c2.g && c1.b === c2.b && c1.a === c2.a);
}
export function parseRgba(rgbaString) {
    const tokens = rgbaString.split(',', 4);
    return new Color(parseInt(tokens[0], 10) / 255, parseInt(tokens[1], 10) / 255, parseInt(tokens[2], 10) / 255, parseInt(tokens[3], 10) / 255);
}
/**
 * Creates a Color object based on a CSS color string. Supports the following notations:
 *  - hex
 *  - rgb/rgba
 *  - hsl/hsla
 *  - named colors
 * Behavior is undefined for strings that are not in one of the listed notations.
 *
 * Optional alphaOverride provided for forcing value of rbga alpha.
 *
 * Note that different browsers may use different color values for the named colors.
 *
 */
export let parseCssColor = (function () {
    const canvas = document.createElement('canvas');
    canvas.width = 1;
    canvas.height = 1;
    const g = canvas.getContext('2d', { willReadFrequently: true });
    return function (cssColorString, alphaOverride) {
        g.clearRect(0, 0, 1, 1);
        g.fillStyle = cssColorString;
        g.fillRect(0, 0, 1, 1);
        const rgbaData = g.getImageData(0, 0, 1, 1).data;
        const R = rgbaData[0] / 255;
        const G = rgbaData[1] / 255;
        const B = rgbaData[2] / 255;
        const A = hasval(alphaOverride) ? alphaOverride : rgbaData[3] / 255;
        return rgba(R, G, B, A);
    };
})();
export function gray(brightness) {
    return new Color(brightness, brightness, brightness, 1);
}
// XXX: Make final
export let black = rgb(0, 0, 0);
export let white = rgb(1, 1, 1);
export let red = rgb(1, 0, 0);
export let green = rgb(0, 1, 0);
export let blue = rgb(0, 0, 1);
export let cyan = rgb(0, 1, 1);
export let magenta = rgb(1, 0, 1);
export let yellow = rgb(1, 1, 0);
export let periwinkle = rgb(0.561, 0.561, 0.961);
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Redistributions of source code must retain the above copyright notice, this\r\n *    list of conditions and the following disclaimer.\r\n *\r\n * 2. Redistributions in binary form must reproduce the above copyright notice,\r\n *    this list of conditions and the following disclaimer in the documentation\r\n *    and/or other materials provided with the distribution.\r\n *\r\n * 3. Neither the name of the copyright holder nor the names of its contributors\r\n *    may be used to endorse or promote products derived from this software without\r\n *    specific prior written permission.\r\n *\r\n * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND\r\n * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\r\n * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\r\n * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR\r\n * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\r\n * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\r\n * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON\r\n * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\r\n * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r\n */\r\nimport { hasval } from './util/util';\r\n\r\nexport class Color {\r\n    private _r: number;\r\n    private _g: number;\r\n    private _b: number;\r\n    private _a: number;\r\n\r\n    get r(): number { return this._r; }\r\n    get g(): number { return this._g; }\r\n    get b(): number { return this._b; }\r\n    get a(): number { return this._a; }\r\n\r\n    get cssString(): string {\r\n        return 'rgba(' + Math.round(255 * this._r) + ',' + Math.round(255 * this._g) + ',' + Math.round(255 * this._b) + ',' + this._a + ')';\r\n    }\r\n\r\n    get rgbaString(): string {\r\n        return '' + Math.round(255 * this._r) + ',' + Math.round(255 * this._g) + ',' + Math.round(255 * this._b) + ',' + Math.round(255 * this._a);\r\n    }\r\n\r\n    constructor(r: number, g: number, b: number, a: number = 1) {\r\n        this._r = r;\r\n        this._g = g;\r\n        this._b = b;\r\n        this._a = a;\r\n    }\r\n\r\n    withAlphaTimes(aFactor: number): Color {\r\n        return new Color(this._r, this._g, this._b, aFactor * this._a);\r\n    }\r\n}\r\n\r\n\r\nexport function darker(color: Color, factor: number): Color {\r\n    return new Color(color.r * factor, color.g * factor, color.b * factor, color.a);\r\n}\r\n\r\n\r\nexport function rgba(r: number, g: number, b: number, a: number): Color {\r\n    return new Color(r, g, b, a);\r\n}\r\n\r\n\r\nexport function rgb(r: number, g: number, b: number): Color {\r\n    return new Color(r, g, b, 1);\r\n}\r\n\r\n\r\nexport function sameColor(c1: Color, c2: Color): boolean {\r\n    if (c1 === c2) {\r\n        return true;\r\n    }\r\n    if (!hasval(c1) || !hasval(c2)) {\r\n        return false;\r\n    }\r\n    return (c1.r === c2.r && c1.g === c2.g && c1.b === c2.b && c1.a === c2.a);\r\n}\r\n\r\n\r\nexport function parseRgba(rgbaString: string): Color {\r\n    const tokens = rgbaString.split(',', 4);\r\n    return new Color(parseInt(tokens[0], 10) / 255, parseInt(tokens[1], 10) / 255, parseInt(tokens[2], 10) / 255, parseInt(tokens[3], 10) / 255);\r\n}\r\n\r\n\r\n/**\r\n * Creates a Color object based on a CSS color string. Supports the following notations:\r\n *  - hex\r\n *  - rgb/rgba\r\n *  - hsl/hsla\r\n *  - named colors\r\n * Behavior is undefined for strings that are not in one of the listed notations.\r\n *\r\n * Optional alphaOverride provided for forcing value of rbga alpha.\r\n *\r\n * Note that different browsers may use different color values for the named colors.\r\n *\r\n */\r\nexport let parseCssColor = (function () {\r\n    const canvas = document.createElement('canvas');\r\n    canvas.width = 1;\r\n    canvas.height = 1;\r\n    const g = canvas.getContext('2d', { willReadFrequently: true});\r\n    return function (cssColorString: string, alphaOverride?: number): Color {\r\n        g.clearRect(0, 0, 1, 1);\r\n        g.fillStyle = cssColorString;\r\n        g.fillRect(0, 0, 1, 1);\r\n\r\n        const rgbaData = g.getImageData(0, 0, 1, 1).data;\r\n        const R = rgbaData[0] / 255;\r\n        const G = rgbaData[1] / 255;\r\n        const B = rgbaData[2] / 255;\r\n        const A = hasval(alphaOverride) ? alphaOverride : rgbaData[3] / 255;\r\n        return rgba(R, G, B, A);\r\n    };\r\n})();\r\n\r\n\r\nexport function gray(brightness: number): Color {\r\n    return new Color(brightness, brightness, brightness, 1);\r\n}\r\n\r\n\r\n// XXX: Make final\r\n\r\nexport let black = rgb(0, 0, 0);\r\nexport let white = rgb(1, 1, 1);\r\n\r\nexport let red = rgb(1, 0, 0);\r\nexport let green = rgb(0, 1, 0);\r\nexport let blue = rgb(0, 0, 1);\r\n\r\nexport let cyan = rgb(0, 1, 1);\r\nexport let magenta = rgb(1, 0, 1);\r\nexport let yellow = rgb(1, 1, 0);\r\n\r\nexport let periwinkle = rgb(0.561, 0.561, 0.961);\r\n\r\n\r\n"]}