Matrix3x3f Matrix3x3f::RotateMatrix(float angle)
{
float cosOfAngle = cosf(angle);
float sinOfAngle = sinf(angle);
Matrix3x3f rotationMatrix;
rotationMatrix.SetIdentity();
rotationMatrix.Set(0, 0, cosOfAngle);
rotationMatrix.Set(1, 0, sinOfAngle);
rotationMatrix.Set(0, 1, -sinOfAngle);
rotationMatrix.Set(1, 1, cosOfAngle);
return rotationMatrix;
}
Matrix3x3f Matrix3x3f::Transpose() const
{
Matrix3x3f transpose;
for(int i = 0; i < 3; i++)
for(int j = 0; j < 3; j++)
transpose.Set(j, i, Get(i, j));
return transpose;
}
Matrix3x3f Matrix3x3f::TranslateMatrix(const Vec2f translation)
{
Matrix3x3f translateMatrix;
translateMatrix.SetIdentity();
translateMatrix.Set(2, 0, translation.x);
translateMatrix.Set(2, 1, translation.y);
return translateMatrix;
}
Matrix3x3f Matrix3x3f::ScaleMatrix(const Vec2f &scale)
{
Matrix3x3f scaleMatrix;
scaleMatrix.SetIdentity();
scaleMatrix.Set(0, 0, scale.x);
scaleMatrix.Set(1, 1, scale.y);
return scaleMatrix;
}
Matrix3x3f Matrix3x3f::operator*(const Matrix3x3f &other) const
{
Matrix3x3f product;
for(int i = 0; i < 3; i++)
for(int j = 0; j < 3; j++)
{
float sum = 0.0f;
// jth row of this by ith column of other
for(int d = 0; d < 3; d++)
sum += Get(d, j) * other.Get(i, d);
product.Set(i, j, sum);
}
return product;
}