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38 lines
886 B
Plaintext
38 lines
886 B
Plaintext
/**
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* @file 路径旋转
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* @author mengke01(kekee000@gmail.com)
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*/
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/**
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* 对path坐标进行调整
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*
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* @param {Object} contour 坐标点
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* @param {number} angle 角度
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* @param {number} centerX x偏移
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* @param {number} centerY y偏移
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*
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* @return {Object} contour 坐标点
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*/
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export default function pathRotate(contour, angle, centerX, centerY) {
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angle = angle === undefined ? 0 : angle;
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const x = centerX || 0;
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const y = centerY || 0;
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const cos = Math.cos(angle);
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const sin = Math.sin(angle);
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let px;
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let py;
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let p;
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// x1=cos(angle)*x-sin(angle)*y;
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// y1=cos(angle)*y+sin(angle)*x;
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for (let i = 0, l = contour.length; i < l; i++) {
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p = contour[i];
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px = cos * (p.x - x) - sin * (p.y - y);
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py = cos * (p.y - y) + sin * (p.x - x);
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p.x = px + x;
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p.y = py + y;
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}
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return contour;
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}
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