| /** |
| * 正多边形 |
| * @module zrender/shape/Isogon |
| */ |
| import Path from '../Path'; |
| var PI = Math.PI; |
| var sin = Math.sin; |
| var cos = Math.cos; |
| export 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; |
| } |
| }); |