fonteditor-core/lib/graphics/pathSkew.js

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

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = pathSkew;
/**
 * @file path倾斜变换
 * @author mengke01(kekee000@gmail.com)
 */

/**
 * path倾斜变换
 *
 * @param {Object} contour 坐标点
 * @param {number} angle 角度
 * @param {number} offsetX x偏移
 * @param {number} offsetY y偏移
 *
 * @return {Object} contour 坐标点
 */
function pathSkew(contour, angle, offsetX, offsetY) {
  angle = angle === undefined ? 0 : angle;
  var x = offsetX || 0;
  var tan = Math.tan(angle);
  var p;
  var i;
  var l;

  // x 平移
  if (x === 0) {
    for (i = 0, l = contour.length; i < l; i++) {
      p = contour[i];
      p.x += tan * (p.y - offsetY);
    }
  }
  // y平移
  else {
    for (i = 0, l = contour.length; i < l; i++) {
      p = contour[i];
      p.y += tan * (p.x - offsetX);
    }
  }
  return contour;
}