/// <summary>
/// Proyectar punto 3D a 2D
/// </summary>
/// <param name="box3d">Punto 3D</param>
/// <param name="box2D">Rectangulo 2D proyectado</param>
/// <returns>False si es un caso degenerado de proyeccion y no debe considerarse</returns>
public static bool projectPoint(Vector3 p, out Rectangle box2D)
{
//Datos de viewport
Device d3dDevice = GuiController.Instance.D3dDevice;
Viewport viewport = d3dDevice.Viewport;
Matrix view = d3dDevice.Transform.View;
Matrix proj = d3dDevice.Transform.Projection;
int width = viewport.Width;
int height = viewport.Height;
Matrix m = view * proj;
//Proyectar
box2D = new Rectangle();
Vector4 pOut = Vector3.Transform(p, m);
if (pOut.W < 0)
{
return(false);
}
Vector3 projVertex = MeshCreatorUtils.toScreenSpace(pOut, width, height);
Vector2 min = new Vector2(projVertex.X, projVertex.Y);
Vector2 max = min + new Vector2(1, 1);
//Clamp
if (min.X < 0f)
{
min.X = 0f;
}
if (min.Y < 0f)
{
min.Y = 0f;
}
if (max.X >= width)
{
max.X = width - 1;
}
if (max.Y >= height)
{
max.Y = height - 1;
}
//Control de tamaño minimo
if (max.X - min.X < 1f)
{
return(false);
}
if (max.Y - min.Y < 1f)
{
return(false);
}
//Cargar valores de box2D
box2D.Location = new Point((int)min.X, (int)min.Y);
box2D.Size = new Size((int)(max.X - min.X), (int)(max.Y - min.Y));
return(true);
}
/// <summary>
/// Proyectar un poligono 3D a 2D en la pantalla
/// </summary>
/// <param name="vertices">Vertices del poligono</param>
/// <param name="box2D">Rectangulo 2D proyectado</param>
/// <returns>False si es un caso degenerado de proyeccion y no debe considerarse</returns>
public static bool projectPolygon(Vector3[] vertices, out Rectangle box2D)
{
//Datos de viewport
Device d3dDevice = GuiController.Instance.D3dDevice;
Viewport viewport = d3dDevice.Viewport;
Matrix view = d3dDevice.Transform.View;
Matrix proj = d3dDevice.Transform.Projection;
int width = viewport.Width;
int height = viewport.Height;
box2D = new Rectangle();
//Proyectar todos los puntos, sin dividir aun por W
Matrix m = view * proj;
Vector3[] projVertices = new Vector3[vertices.Length];
for (int i = 0; i < vertices.Length; i++)
{
Vector4 pOut = Vector3.Transform(vertices[i], m);
if (pOut.W < 0)
{
return(false);
}
projVertices[i] = MeshCreatorUtils.toScreenSpace(pOut, width, height);
}
//Buscar los puntos extremos
Vector2 min = new Vector2(float.MaxValue, float.MaxValue);
Vector2 max = new Vector2(float.MinValue, float.MinValue);
float minDepth = float.MaxValue;
foreach (Vector3 v in projVertices)
{
if (v.X < min.X)
{
min.X = v.X;
}
if (v.Y < min.Y)
{
min.Y = v.Y;
}
if (v.X > max.X)
{
max.X = v.X;
}
if (v.Y > max.Y)
{
max.Y = v.Y;
}
if (v.Z < minDepth)
{
minDepth = v.Z;
}
}
//Clamp
if (min.X < 0f)
{
min.X = 0f;
}
if (min.Y < 0f)
{
min.Y = 0f;
}
if (max.X >= width)
{
max.X = width - 1;
}
if (max.Y >= height)
{
max.Y = height - 1;
}
//Control de tamaño minimo
if (max.X - min.X < 1f)
{
return(false);
}
if (max.Y - min.Y < 1f)
{
return(false);
}
//Cargar valores de box2D
box2D.Location = new Point((int)min.X, (int)min.Y);
box2D.Size = new Size((int)(max.X - min.X), (int)(max.Y - min.Y));
return(true);
}
