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