// 获取代数余子式
public float _GetRemianValue(int trimRow, int trimCol)
{
int remainNumber = mNumber - 1;
// 余子式
Matrix22 remain = new Matrix22();
int index = 0;
for (int row = 0; row < mNumber; row++)
{
for (int col = 0; col < mNumber; col++)
{
if (row != trimRow && col != trimCol)
{
int rowIndex = index / remainNumber;
int colIndex = index % remainNumber;
++index;
remain[rowIndex, colIndex] = this[row, col];
}
}
}
// 代数余子式
float remainValue = remain.Determinant() * (float)Math.Pow(-1, trimRow + trimCol);
return(remainValue);
}
// 使用物体->惯性旋转矩阵构建OBB
public OBB2D(Vector2 center, Vector2 size, Matrix22 object2Intertial)
{
m_Center = center;
m_Extent = size * 0.5f;
m_right = new Vector2(object2Intertial[0, 0], object2Intertial[0, 1]);
m_forward = new Vector2(object2Intertial[1, 0], object2Intertial[1, 1]);
}
