fonteditor-core/lib/graphics/matrix.js

fonts (ttf, woff, woff2, eot, svg, otf) parse, write, transform, glyph adjust.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.mul = mul;
exports.multiply = multiply;
/**
 * @file matrix变换操作
 * @author mengke01(kekee000@gmail.com)
 */

/**
 * 仿射矩阵相乘
 *
 * @param  {Array=} matrix1 矩阵1
 * @param  {Array=} matrix2 矩阵2
 * @return {Array}         新矩阵
 */
function mul() {
  var matrix1 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [1, 0, 0, 1];
  var matrix2 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [1, 0, 0, 1];
  // 旋转变换 4 个参数
  if (matrix1.length === 4) {
    return [matrix1[0] * matrix2[0] + matrix1[2] * matrix2[1], matrix1[1] * matrix2[0] + matrix1[3] * matrix2[1], matrix1[0] * matrix2[2] + matrix1[2] * matrix2[3], matrix1[1] * matrix2[2] + matrix1[3] * matrix2[3]];
  }
  // 旋转位移变换, 6 个参数

  return [matrix1[0] * matrix2[0] + matrix1[2] * matrix2[1], matrix1[1] * matrix2[0] + matrix1[3] * matrix2[1], matrix1[0] * matrix2[2] + matrix1[2] * matrix2[3], matrix1[1] * matrix2[2] + matrix1[3] * matrix2[3], matrix1[0] * matrix2[4] + matrix1[2] * matrix2[5] + matrix1[4], matrix1[1] * matrix2[4] + matrix1[3] * matrix2[5] + matrix1[5]];
}

/**
 * 多个仿射矩阵相乘
 *
 * @param {...Array} matrixs matrix array
 * @return {Array}         新矩阵
 */
function multiply() {
  var result = arguments.length <= 0 ? undefined : arguments[0];
  for (var i = 1, matrix; matrix = i < 0 || arguments.length <= i ? undefined : arguments[i]; i++) {
    result = mul(result, matrix);
  }
  return result;
}