TanTan
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27 lines
634 B
Plaintext
27 lines
634 B
Plaintext
/**
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* @file 按Y轴平移变换, 变换中心为图像中心点
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* @author mengke01(kekee000@gmail.com)
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*/
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import {computePath} from './computeBoundingBox';
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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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*
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* @return {Object} contour 坐标点
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*/
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export default function pathSkewY(contour, angle) {
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angle = angle === undefined ? 0 : angle;
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const x = computePath(contour).x;
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const tan = Math.tan(angle);
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let p;
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// y 平移
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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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p.y += tan * (p.x - x);
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}
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return contour;
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}
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