/// <summary>
/// Constructor with 3 points. Throw exception if the given points cannot form a rectangle.
/// </summary>
/// <param name="point1">First point</param>
/// <param name="point2">Second point</param>
/// <param name="point3">Third point</param>
public Rectangle(Point3D point1, Point3D point2, Point3D point3)
{
Point3D point4 = point1 + (point2 - point1) + (point3 - point1);
if (Rectangle.Exists(point3, point1, point2, point4))
{
Point1 = point3;
Point2 = point1;
Point3 = point2;
Point4 = point4;
}
else
{
point4 = point2 + (point1 - point2) + (point3 - point2);
if (Rectangle.Exists(point1, point2, point3, point4))
{
Point1 = point1;
Point2 = point2;
Point3 = point3;
Point4 = point4;
}
else
{
point4 = point3 + (point1 - point3) + (point2 - point3);
if (Rectangle.Exists(point1, point3, point2, point4))
{
Point1 = point1;
Point2 = point3;
Point3 = point2;
Point4 = point4;
}
else
{
throw new Exception();
}
}
}
normal = Vector3D.CrossProduct(Point2 - Point1, Point3 - Point2);
normal.Normalize();
}
/// <summary>
/// Setup the camera before using it
/// </summary>
public void Setup()
{
viewDirection = LookAt - Location;
viewDirection.Normalize();
U = Vector3D.CrossProduct(viewDirection, new Vector3D(0, 1, 0));
V = Vector3D.CrossProduct(U, viewDirection);
U.Normalize();
V.Normalize();
double viewPlaneWidth = Width / FocalLength;
double viewPlaneHeight = Height / FocalLength;
viewPlaneTopLeftPoint = LookAt - V * (viewPlaneHeight / 2) - U * (viewPlaneWidth / 2);
xIncVector = (U * viewPlaneWidth) / Width;
yIncVector = (V * viewPlaneHeight) / Height;
//Console.WriteLine("xIncVec : " + xIncVector.ToString());
//Console.WriteLine("yIncVec : " + yIncVector.ToString());
//Console.WriteLine("Width : " + Width.ToString());
//Console.WriteLine("Height : " + Height.ToString());
}