forked from zhurui/management
44 lines
771 B
JavaScript
44 lines
771 B
JavaScript
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/**
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* 正多边形
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* @module zrender/shape/Isogon
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*/
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import Path from '../Path';
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var PI = Math.PI;
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var sin = Math.sin;
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var cos = Math.cos;
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export default Path.extend({
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type: 'isogon',
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shape: {
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x: 0, y: 0,
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r: 0, n: 0
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},
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buildPath: function (ctx, shape) {
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var n = shape.n;
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if (!n || n < 2) {
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return;
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}
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var x = shape.x;
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var y = shape.y;
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var r = shape.r;
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var dStep = 2 * PI / n;
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var deg = -PI / 2;
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ctx.moveTo(x + r * cos(deg), y + r * sin(deg));
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for (var i = 0, end = n - 1; i < end; i++) {
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deg += dStep;
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ctx.lineTo(x + r * cos(deg), y + r * sin(deg));
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}
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ctx.closePath();
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return;
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}
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});
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