55 lines
1.4 KiB
JavaScript
55 lines
1.4 KiB
JavaScript
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import { __extends } from "tslib";
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import Path from '../Path.js';
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var PI = Math.PI;
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var cos = Math.cos;
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var sin = Math.sin;
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var StarShape = (function () {
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function StarShape() {
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this.cx = 0;
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this.cy = 0;
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this.n = 3;
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this.r = 0;
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}
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return StarShape;
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}());
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export { StarShape };
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var Star = (function (_super) {
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__extends(Star, _super);
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function Star(opts) {
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return _super.call(this, opts) || this;
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}
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Star.prototype.getDefaultShape = function () {
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return new StarShape();
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};
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Star.prototype.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.cx;
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var y = shape.cy;
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var r = shape.r;
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var r0 = shape.r0;
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if (r0 == null) {
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r0 = n > 4
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? r * cos(2 * PI / n) / cos(PI / n)
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: r / 3;
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}
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var dStep = PI / n;
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var deg = -PI / 2;
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var xStart = x + r * cos(deg);
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var yStart = y + r * sin(deg);
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deg += dStep;
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ctx.moveTo(xStart, yStart);
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for (var i = 0, end = n * 2 - 1, ri = void 0; i < end; i++) {
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ri = i % 2 === 0 ? r0 : r;
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ctx.lineTo(x + ri * cos(deg), y + ri * sin(deg));
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deg += dStep;
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}
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ctx.closePath();
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};
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return Star;
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}(Path));
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Star.prototype.type = 'star';
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export default Star;
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