/// <summary>
/// Sets a 2d vector.
/// </summary>
/// <param name="vec">Vector to set.</param>
public void Set(Purple.Math.Vector2 vec)
{
lastUpdate++;
Resize(4, ShaderConstantType.Float);
values.SetValue(vec.X, 0);
values.SetValue(vec.Y, 1);
values.SetValue(0.0f, 2);
values.SetValue(1.0f, 3);
}
/// <summary>
/// rotates a unit vector
/// </summary>
/// <param name="vec">vector to rotate</param>
/// <param name="alpha">angle to use for rotation</param>
/// <returns>rotates a certain unit vector</returns>
public Purple.Math.Vector2 RotateUnit(Purple.Math.Vector2 vec, float alpha)
{
return(PixelToUnit(Purple.Math.Vector2.Rotate(UnitToPixel(vec), alpha)));
}
/// <summary>
/// converts pixel coordinates to unit coordinates
/// </summary>
/// <param name="pixel">pixel position</param>
/// <returns>unit position</returns>
public Purple.Math.Vector2 PixelToUnit(Purple.Math.Vector2 pixel)
{
return(new Purple.Math.Vector2((pixel.X - 0.5f) / targetSize.X, (pixel.Y - 0.5f) / targetSize.Y));
}
/// <summary>
/// converts unit coordinates to pixel coordinates
/// </summary>
/// <param name="unit">unit position</param>
/// <returns>pixel position</returns>
public Purple.Math.Vector2 UnitToPixel(Purple.Math.Vector2 unit)
{
return(new Purple.Math.Vector2(unit.X * targetSize.X + 0.5f, unit.Y * targetSize.Y + 0.5f));
}
/// <summary>
/// Sets a 2d vector.
/// </summary>
/// <param name="vec">Vector to set.</param>
public void Set(Purple.Math.Vector2 vec)
{
internalConstant.Set(vec);
}
