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Viewing file:     Isogon.js (717 B)      -rw-r--r--

var Path = require("../Path");

/**
 * 正多边形
 * @module zrender/shape/Isogon
 */
var PI = Math.PI;
var sin = Math.sin;
var cos = Math.cos;

var _default = Path.extend({
  type: 'isogon',
  shape: {
    x: 0,
    y: 0,
    r: 0,
    n: 0
  },
  buildPath: function (ctx, shape) {
    var n = shape.n;

    if (!n || n < 2) {
      return;
    }

    var x = shape.x;
    var y = shape.y;
    var r = shape.r;
    var dStep = 2 * PI / n;
    var deg = -PI / 2;
    ctx.moveTo(x + r * cos(deg), y + r * sin(deg));

    for (var i = 0, end = n - 1; i < end; i++) {
      deg += dStep;
      ctx.lineTo(x + r * cos(deg), y + r * sin(deg));
    }

    ctx.closePath();
    return;
  }
});

module.exports = _default;