46 lines
979 B
Plaintext
46 lines
979 B
Plaintext
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = transform;
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/**
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* @file 对轮廓进行transform变换
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* @author mengke01(kekee000@gmail.com)
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*
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* 参考资料：
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* http://blog.csdn.net/henren555/article/details/9699449
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*
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* |X| |a c e| |x|
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* |Y| = |b d f| * |y|
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* |1| |0 0 1| |1|
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*
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* X = x * a + y * c + e
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* Y = x * b + y * d + f
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*/
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/**
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* 图形仿射矩阵变换
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*
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* @param {Array.<Object>} contour 轮廓点
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* @param {number} a m11
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* @param {number} b m12
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* @param {number} c m21
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* @param {number} d m22
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* @param {number} e dx
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* @param {number} f dy
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* @return {Array.<Object>} contour 轮廓点
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*/
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function transform(contour, a, b, c, d, e, f) {
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var x;
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var y;
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var p;
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for (var i = 0, l = contour.length; i < l; i++) {
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p = contour[i];
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x = p.x;
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y = p.y;
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p.x = x * a + y * c + e;
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p.y = x * b + y * d + f;
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}
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return contour;
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} |