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37 lines
1011 B
Plaintext
37 lines
1011 B
Plaintext
/**
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* @file 椭圆转换成轮廓
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* @author mengke01(kekee000@gmail.com)
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*/
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import {computePath} from '../../graphics/computeBoundingBox';
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import pathAdjust from '../../graphics/pathAdjust';
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import circlePath from '../../graphics/path/circle';
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import {clone} from '../../common/lang';
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/**
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* 椭圆转换成轮廓
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*
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* @param {number} cx 椭圆中心点x
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* @param {number} cy 椭圆中心点y
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* @param {number} rx 椭圆x轴半径
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* @param {number} ry 椭圆y周半径
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* @return {Array} 轮廓数组
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*/
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export default function oval2contour(cx, cy, rx, ry) {
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if (undefined === ry) {
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ry = rx;
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}
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const bound = computePath(circlePath);
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const scaleX = (+rx) * 2 / bound.width;
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const scaleY = (+ry) * 2 / bound.height;
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const centerX = bound.width * scaleX / 2;
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const centerY = bound.height * scaleY / 2;
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const contour = clone(circlePath);
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pathAdjust(contour, scaleX, scaleY);
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pathAdjust(contour, 1, 1, +cx - centerX, +cy - centerY);
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return contour;
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}
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