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 liuqimichale
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/**
* 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;
}
});
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