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Viewing file:     Star.js (1.17 KB)      -rw-r--r--

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

/**
 * n角星（n>3）
 * @module zrender/graphic/shape/Star
 */
var PI = Math.PI;
var cos = Math.cos;
var sin = Math.sin;

var _default = Path.extend({
  type: 'star',
  shape: {
    cx: 0,
    cy: 0,
    n: 3,
    r0: null,
    r: 0
  },
  buildPath: function (ctx, shape) {
    var n = shape.n;

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

    var x = shape.cx;
    var y = shape.cy;
    var r = shape.r;
    var r0 = shape.r0; // 如果未指定内部顶点外接圆半径，则自动计算

    if (r0 == null) {
      r0 = n > 4 // 相隔的外部顶点的连线的交点，
      // 被取为内部交点，以此计算r0
      ? r * cos(2 * PI / n) / cos(PI / n) // 二三四角星的特殊处理
      : r / 3;
    }

    var dStep = PI / n;
    var deg = -PI / 2;
    var xStart = x + r * cos(deg);
    var yStart = y + r * sin(deg);
    deg += dStep; // 记录边界点，用于判断inside

    ctx.moveTo(xStart, yStart);

    for (var i = 0, end = n * 2 - 1, ri; i < end; i++) {
      ri = i % 2 === 0 ? r0 : r;
      ctx.lineTo(x + ri * cos(deg), y + ri * sin(deg));
      deg += dStep;
    }

    ctx.closePath();
  }
});

module.exports = _default;