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Corrected Matrix2x3 multiply operator, which had inverted order of operations

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Kearwood Kip Gilbert
2018-04-19 17:23:41 -07:00
parent 89a6662b6c
commit a31d510360
1 changed files with 9 additions and 1 deletions
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8
src/matrix2x3.cpp
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@@ -81,12 +81,20 @@ bool Matrix2x3::operator==(const Matrix2x3 &m) const {
// Overload compound multiply operator
Matrix2x3& Matrix2x3::operator*=(const Matrix2x3 &m) {
float temp[6];
/*
temp[0] = c[0] * m[0] + c[2] * m[1];
temp[1] = c[1] * m[0] + c[3] * m[1];
temp[2] = c[0] * m[2] + c[2] * m[3];
temp[3] = c[1] * m[2] + c[3] * m[3];
temp[4] = c[0] * m[4] + c[2] * m[5] + c[4];
temp[5] = c[1] * m[4] + c[3] * m[5] + c[5];
*/
temp[0] = m[0] * c[0] + m[2] * c[1];
temp[1] = m[1] * c[0] + m[3] * c[1];
temp[2] = m[0] * c[2] + m[2] * c[3];
temp[3] = m[1] * c[2] + m[3] * c[3];
temp[4] = m[0] * c[4] + m[2] * c[5] + m[4];
temp[5] = m[1] * c[4] + m[3] * c[5] + m[5];
memcpy(c, temp, sizeof(float) * 6);
return *this;