@antv/x6/lib/registry/filter/gray-scale.js

JavaScript diagramming library that uses SVG and HTML for rendering

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.grayScale = void 0;
const util_1 = require("./util");
function grayScale(args = {}) {
    const amount = (0, util_1.getNumber)(args.amount, 1);
    const a = 0.2126 + 0.7874 * (1 - amount);
    const b = 0.7152 - 0.7152 * (1 - amount);
    const c = 0.0722 - 0.0722 * (1 - amount);
    const d = 0.2126 - 0.2126 * (1 - amount);
    const e = 0.7152 + 0.2848 * (1 - amount);
    const f = 0.0722 - 0.0722 * (1 - amount);
    const g = 0.2126 - 0.2126 * (1 - amount);
    const h = 0.0722 + 0.9278 * (1 - amount);
    return `
    <filter>
      <feColorMatrix type="matrix" values="${a} ${b} ${c} 0 0 ${d} ${e} ${f} 0 0 ${g} ${b} ${h} 0 0 0 0 0 1 0"/>
    </filter>
  `.trim();
}
exports.grayScale = grayScale;
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