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| /**
| * 内外旋轮曲线
| * @module zrender/graphic/shape/Trochold
| */
|
| import Path from '../Path';
|
| var cos = Math.cos;
| var sin = Math.sin;
|
| export default Path.extend({
|
| type: 'trochoid',
|
| shape: {
| cx: 0,
| cy: 0,
| r: 0,
| r0: 0,
| d: 0,
| location: 'out'
| },
|
| style: {
| stroke: '#000',
|
| fill: null
| },
|
| buildPath: function (ctx, shape) {
| var x1;
| var y1;
| var x2;
| var y2;
| var R = shape.r;
| var r = shape.r0;
| var d = shape.d;
| var offsetX = shape.cx;
| var offsetY = shape.cy;
| var delta = shape.location === 'out' ? 1 : -1;
|
| if (shape.location && R <= r) {
| return;
| }
|
| var num = 0;
| var i = 1;
| var theta;
|
| x1 = (R + delta * r) * cos(0)
| - delta * d * cos(0) + offsetX;
| y1 = (R + delta * r) * sin(0)
| - d * sin(0) + offsetY;
|
| ctx.moveTo(x1, y1);
|
| // 计算结束时的i
| do {
| num++;
| }
| while ((r * num) % (R + delta * r) !== 0);
|
| do {
| theta = Math.PI / 180 * i;
| x2 = (R + delta * r) * cos(theta)
| - delta * d * cos((R / r + delta) * theta)
| + offsetX;
| y2 = (R + delta * r) * sin(theta)
| - d * sin((R / r + delta) * theta)
| + offsetY;
| ctx.lineTo(x2, y2);
| i++;
| }
| while (i <= (r * num) / (R + delta * r) * 360);
|
| }
| });
|
|
