sigma/utils/matrices.js

A JavaScript library dedicated to graph drawing.

"use strict";
/**
 * Sigma.js WebGL Matrices Helpers
 * ================================
 *
 * Matrices-related helper functions used by sigma's WebGL renderer.
 * @module
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.multiply = exports.translate = exports.rotate = exports.scale = exports.identity = void 0;
function identity() {
    return Float32Array.of(1, 0, 0, 0, 1, 0, 0, 0, 1);
}
exports.identity = identity;
// TODO: optimize
function scale(m, x, y) {
    m[0] = x;
    m[4] = typeof y === "number" ? y : x;
    return m;
}
exports.scale = scale;
function rotate(m, r) {
    var s = Math.sin(r), c = Math.cos(r);
    m[0] = c;
    m[1] = s;
    m[3] = -s;
    m[4] = c;
    return m;
}
exports.rotate = rotate;
function translate(m, x, y) {
    m[6] = x;
    m[7] = y;
    return m;
}
exports.translate = translate;
function multiply(a, b) {
    var a00 = a[0], a01 = a[1], a02 = a[2];
    var a10 = a[3], a11 = a[4], a12 = a[5];
    var a20 = a[6], a21 = a[7], a22 = a[8];
    var b00 = b[0], b01 = b[1], b02 = b[2];
    var b10 = b[3], b11 = b[4], b12 = b[5];
    var b20 = b[6], b21 = b[7], b22 = b[8];
    a[0] = b00 * a00 + b01 * a10 + b02 * a20;
    a[1] = b00 * a01 + b01 * a11 + b02 * a21;
    a[2] = b00 * a02 + b01 * a12 + b02 * a22;
    a[3] = b10 * a00 + b11 * a10 + b12 * a20;
    a[4] = b10 * a01 + b11 * a11 + b12 * a21;
    a[5] = b10 * a02 + b11 * a12 + b12 * a22;
    a[6] = b20 * a00 + b21 * a10 + b22 * a20;
    a[7] = b20 * a01 + b21 * a11 + b22 * a21;
    a[8] = b20 * a02 + b21 * a12 + b22 * a22;
    return a;
}
exports.multiply = multiply;