fonteditor-core/lib/graphics/pathRotate.js

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

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = pathRotate;
/**
 * @file 路径旋转
 * @author mengke01(kekee000@gmail.com)
 */

/**
 * 对path坐标进行调整
 *
 * @param {Object} contour 坐标点
 * @param {number} angle 角度
 * @param {number} centerX x偏移
 * @param {number} centerY y偏移
 *
 * @return {Object} contour 坐标点
 */
function pathRotate(contour, angle, centerX, centerY) {
  angle = angle === undefined ? 0 : angle;
  var x = centerX || 0;
  var y = centerY || 0;
  var cos = Math.cos(angle);
  var sin = Math.sin(angle);
  var px;
  var py;
  var p;

  // x1=cos(angle)*x-sin(angle)*y;
  // y1=cos(angle)*y+sin(angle)*x;
  for (var i = 0, l = contour.length; i < l; i++) {
    p = contour[i];
    px = cos * (p.x - x) - sin * (p.y - y);
    py = cos * (p.y - y) + sin * (p.x - x);
    p.x = px + x;
    p.y = py + y;
  }
  return contour;
}