static Matrix2x3()
{
Matrix2x3 m = default(Matrix2x3);
m.values[0] = 1.0f;
m.values[4] = 1.0f;
Identity = m;
}
static Matrix2x3()
{
Matrix2x3 m = default(Matrix2x3);
m.values[0] = 1.0f;
m.values[4] = 1.0f;
Identity = m;
}
protected override Vector2 GetTexturePosition(Vector2 vertex, Matrix2x3 inverseTransform)
{
if (texture == null) return Vector2.Zero;
Vector2 textPos = inverseTransform.ApplyTo(vertex);
textPos.X /= texture.Width;
textPos.Y /= texture.Height;
return textPos;
}
/// <summary>
/// Returns the inverse matrix of this matrix.
/// </summary>
/// <exception cref="InvalidOperationException">Is thrown when the matrix is singular an therefore not invertible.</exception>
public Matrix2x3 Invert()
{
Matrix2x3 m1 = this;
Matrix2x3 m2 = Matrix2x3.Identity;
if (m1.values[0] == 0 || m1.values[4] == 0)
{
if (m1.values[1] == 0 || m1.values[3] == 0)
throw new InvalidOperationException("This matrix is singular."); }
m1.SwapRows();
m2.SwapRows();
}
/// <summary>
/// Multiplies zwo matrices.
/// </summary>
public static Matrix2x3 Multiply(Matrix2x3 left, Matrix2x3 right)
{
Matrix2x3 m = default(Matrix2x3);
for (int x = 0; x < 2; x++)
{
for (int y = 0; y < 3; y++)
{
m[x, y] = left[x, 0] * right[0, y] + left[x, 1] * right[1, y] + (y == 2 ? left[x, 2] : 0);
}
}
return m;
}
/// <summary>
/// Resets the world transformation matrix to the identity matrix.
/// </summary>
public void ResetTransform()
{
Transform = Matrix2x3.Identity;
}
protected virtual Math.Vector2 GetTexturePosition(Math.Vector2 vertex, Matrix2x3 inverseTransform)
{
return Math.Vector2.Zero;
}