/*
* Calculates the pespective screensize
*/
public float GetScreenSize()
{
var tan = GonioFactory.GetTrigonometricByDegrees(_fieldOfView / 2, Trigonometric.Tangent);
var halfSize = tan * _far;
return(halfSize * 2);
}
/*
* Returns a 2D rotation matrix.
*/
public static Matrix Rotate2D(float alpha)
{
Matrix rotationMatrix = new Matrix(2, 2);
float cos = GonioFactory.GetTrigonometricByDegrees(alpha, Trigonometric.Cosine);
float sin = GonioFactory.GetTrigonometricByDegrees(alpha, Trigonometric.Sine);
float[,] data =
{
{ cos, -sin },
{ sin, cos }
};
rotationMatrix.SetData(data);
return(rotationMatrix);
}