public static Vector2 Multiply(ref Matrix3x2 m, Vector2 v)
{
return new Vector2(
m.M00 * v.X + m.M10 * v.Y + m.M20,
m.M01 * v.X + m.M11 * v.Y + m.M21
);
}
public static void Multiply(ref Matrix3x2 left, ref Matrix3x2 right, out Matrix3x2 result)
{
result = new Matrix3x2(
left.M00 * right.M00 + left.M10 * right.M01,
left.M01 * right.M00 + left.M11 * right.M01,
left.M00 * right.M10 + left.M10 * right.M11,
left.M01 * right.M10 + left.M11 * right.M11,
left.M00 * right.M20 + left.M10 * right.M21 + left.M20,
left.M01 * right.M20 + left.M11 * right.M21 + left.M21
);
}
public void Clear()
{
m_queueSize = 0;
m_transformStack.Clear();
m_transform = Matrix3x2.Identity;
}
public void Translate(Vector2 v)
{
// M00 M10 M20
// M01 M11 M21
// 1 0 v.X
// 0 1 v.Y
m_transform = new Matrix3x2(
m_transform.M00,
m_transform.M01,
m_transform.M10,
m_transform.M11,
m_transform.M00 * v.X + m_transform.M10 * v.Y + m_transform.M20,
m_transform.M01 * v.X + m_transform.M11 * v.Y + m_transform.M21
);
}
public void Scale(Vector2 v)
{
// M00 M10 M20
// M01 M11 M21
// v.X 0 0
// 0 v.Y 0
m_transform = new Matrix3x2(
m_transform.M00 * v.X,
m_transform.M01 * v.X,
m_transform.M10 * v.Y,
m_transform.M11 * v.Y,
m_transform.M20,
m_transform.M21
);
}
public void Rotate(float angle)
{
// M00 M10 M20
// M01 M11 M21
// c s 0
// -s c 0
var c = (float)Math.Cos(angle);
var s = (float)Math.Sin(angle);
m_transform = new Matrix3x2(
m_transform.M00 * c - m_transform.M10 * s,
m_transform.M01 * c - m_transform.M11 * s,
m_transform.M00 * s + m_transform.M10 * c,
m_transform.M01 * s + m_transform.M11 * c,
m_transform.M20,
m_transform.M21
);
}
public void PopTransform()
{
m_transform = m_transformStack.Pop();
}
public void Ortho(float left, float right, float bottom, float top)
{
var right_minus_left = right - left;
var top_minus_bottom = top - bottom;
m_transform = new Matrix3x2(
2 / right_minus_left, 0,
0, 2 / top_minus_bottom,
-(right + left) / right_minus_left,
-(top + bottom) / top_minus_bottom
);
}
