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50 lines
1.4 KiB
Plaintext
50 lines
1.4 KiB
Plaintext
/**
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* @file matrix变换操作
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* @author mengke01(kekee000@gmail.com)
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*/
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/**
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* 仿射矩阵相乘
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*
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* @param {Array=} matrix1 矩阵1
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* @param {Array=} matrix2 矩阵2
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* @return {Array} 新矩阵
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*/
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export function mul(matrix1 = [1, 0, 0, 1], matrix2 = [1, 0, 0, 1]) {
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// 旋转变换 4 个参数
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if (matrix1.length === 4) {
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return [
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matrix1[0] * matrix2[0] + matrix1[2] * matrix2[1],
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matrix1[1] * matrix2[0] + matrix1[3] * matrix2[1],
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matrix1[0] * matrix2[2] + matrix1[2] * matrix2[3],
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matrix1[1] * matrix2[2] + matrix1[3] * matrix2[3]
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];
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}
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// 旋转位移变换, 6 个参数
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return [
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matrix1[0] * matrix2[0] + matrix1[2] * matrix2[1],
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matrix1[1] * matrix2[0] + matrix1[3] * matrix2[1],
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matrix1[0] * matrix2[2] + matrix1[2] * matrix2[3],
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matrix1[1] * matrix2[2] + matrix1[3] * matrix2[3],
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matrix1[0] * matrix2[4] + matrix1[2] * matrix2[5] + matrix1[4],
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matrix1[1] * matrix2[4] + matrix1[3] * matrix2[5] + matrix1[5]
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];
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}
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/**
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* 多个仿射矩阵相乘
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*
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* @param {...Array} matrixs matrix array
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* @return {Array} 新矩阵
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*/
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export function multiply(...matrixs) {
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let result = matrixs[0];
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for (let i = 1, matrix; (matrix = matrixs[i]); i++) {
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result = mul(result, matrix);
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}
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return result;
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}
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