41 lines
859 B
Plaintext
41 lines
859 B
Plaintext
/**
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* @file path倾斜变换
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* @author mengke01(kekee000@gmail.com)
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*/
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/**
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* path倾斜变换
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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} offsetX x偏移
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* @param {number} offsetY 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 pathSkew(contour, angle, offsetX, offsetY) {
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angle = angle === undefined ? 0 : angle;
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const x = offsetX || 0;
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const tan = Math.tan(angle);
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let p;
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let i;
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let l;
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// x 平移
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if (x === 0) {
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for (i = 0, l = contour.length; i < l; i++) {
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p = contour[i];
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p.x += tan * (p.y - offsetY);
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}
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}
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// y平移
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else {
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for (i = 0, l = contour.length; i < l; i++) {
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p = contour[i];
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p.y += tan * (p.x - offsetX);
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}
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}
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return contour;
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}
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