public Polygon GetOcclusionPoly()
{
Polygon p = new Polygon();
PointCollection polygonPoints = new PointCollection();
Face checkFace = this;
polygonPoints.Add(new Point(x, y)); //Add start point
int i = 0;
//Loop through faces starting at the start line until end line is found.
while (checkFace.endLine == null && i < 20)
{
if (checkFace.GetAdjacentFace(false) == null) // There's no adjacent face, so we'll curve around the corner to find the endline
{
checkFace = checkFace.next;
polygonPoints.Add(new Point(checkFace.next.next.x, checkFace.next.next.y)); // add the opposite face so that we can show the wall but not what's behind it.
}
else if (checkFace.GetAdjacentFace(false) != null && checkFace.GetAdjacentFace(false).over != null) // If we're in a concave corner, curve around that
{
//Add a fuckton of points to include the wall we're occluding from
polygonPoints.Add(new Point(checkFace.next.next.next.x, checkFace.next.next.next.y));
polygonPoints.Add(new Point(checkFace.GetAdjacentFace(false).next.next.next.x, checkFace.GetAdjacentFace(false).next.next.next.y));
polygonPoints.Add(new Point(checkFace.GetAdjacentFace(false).next.next.x, checkFace.GetAdjacentFace(false).next.next.y));
polygonPoints.Add(new Point(checkFace.GetAdjacentFace(false).next.x, checkFace.GetAdjacentFace(false).next.y));
checkFace = checkFace.GetAdjacentFace(false).over.next;
///polygonPoints.Add(new Point(checkFace.x, checkFace.y));
}
else
{
polygonPoints.Add(new Point(checkFace.next.next.next.x, checkFace.next.next.next.y));
polygonPoints.Add(new Point(checkFace.next.next.x, checkFace.next.next.y));
checkFace = checkFace.GetAdjacentFace(false);
polygonPoints.Add(new Point(checkFace.next.next.x, checkFace.next.next.y));
}
i++;
}
if (i == 0 && checkFace.endLine != null) // If the endline is on the same face as the start line add the backfaces to the occlusion poly
{
polygonPoints.Add(new Point(checkFace.next.next.next.x, checkFace.next.next.next.y));
polygonPoints.Add(new Point(checkFace.next.next.x, checkFace.next.next.y));
}
if (checkFace.endLine != null)
{
polygonPoints.Add(new Point(checkFace.endLine.X1, checkFace.endLine.Y1));
polygonPoints.Add(new Point(checkFace.endLine.X2, checkFace.endLine.Y2));
}
else
{
return(null);
}
//ARTIFACT CORRECTION
//Do we need a corner point?
if (startLine.X2 == mainWindow.WindowTopLeft.X && checkFace.endLine.Y2 == mainWindow.WindowTopLeft.Y)
{
polygonPoints.Add(mainWindow.WindowTopLeft);
}
else if (checkFace.endLine.X2 == mainWindow.WindowBottomRight.X && startLine.Y2 == mainWindow.WindowTopLeft.Y)
{
polygonPoints.Add(new Point(mainWindow.WindowBottomRight.X, mainWindow.WindowTopLeft.Y));
}
else if (startLine.X2 == mainWindow.WindowBottomRight.X && checkFace.endLine.Y2 == mainWindow.WindowBottomRight.Y)
{
polygonPoints.Add(mainWindow.WindowBottomRight);
}
else if (checkFace.endLine.X2 == mainWindow.WindowTopLeft.X && startLine.Y2 == mainWindow.WindowBottomRight.Y)
{
polygonPoints.Add(new Point(mainWindow.WindowTopLeft.X, mainWindow.WindowBottomRight.Y));
}
//Do we need 2 corner points?
if (checkFace.endLine.X2 == mainWindow.WindowTopLeft.X && startLine.X2 == mainWindow.WindowBottomRight.X)
{
polygonPoints.Add(new Point(mainWindow.WindowTopLeft.X, mainWindow.WindowBottomRight.Y));
polygonPoints.Add(mainWindow.WindowBottomRight);
}
if (startLine.X2 == mainWindow.WindowTopLeft.X && checkFace.endLine.X2 == mainWindow.WindowBottomRight.X)
{
polygonPoints.Add(new Point(mainWindow.WindowBottomRight.X, mainWindow.WindowTopLeft.Y));
polygonPoints.Add(mainWindow.WindowTopLeft);
}
if (startLine.Y2 == mainWindow.WindowTopLeft.Y && checkFace.endLine.Y2 == mainWindow.WindowBottomRight.Y)
{
polygonPoints.Add(mainWindow.WindowBottomRight);
polygonPoints.Add(new Point(mainWindow.WindowBottomRight.X, mainWindow.WindowTopLeft.Y));
}
if (checkFace.endLine.Y2 == mainWindow.WindowTopLeft.Y && startLine.Y2 == mainWindow.WindowBottomRight.Y)
{
polygonPoints.Add(mainWindow.WindowTopLeft);
polygonPoints.Add(new Point(mainWindow.WindowTopLeft.X, mainWindow.WindowBottomRight.Y));
}
//And the last point to bring 'er home.
polygonPoints.Add(new Point(startLine.X2, startLine.Y2));
p.Points = polygonPoints;
p.Stroke = Brushes.Black;
p.Fill = Brushes.Black;
p.Opacity = 0.4;
return(p);
}
public void GenerateFaces()
{
//Faces are defined as the start point and the next adjoining face. We're only dealing with squares so no need to do lots of general poly s***e.
//The point defined per face is the right vertex of the face as if you were inside the square.
faceW = new Face(mainWindow);
faceW.x = x * tileSize;
faceW.y = y * tileSize;
faceS = new Face(mainWindow);
faceS.x = x * tileSize;
faceS.y = (y + 1) * tileSize;
faceE = new Face(mainWindow);
faceE.x = (x + 1) * tileSize;
faceE.y = (y + 1) * tileSize;
faceN = new Face(mainWindow);
faceN.x = (x + 1) * tileSize;
faceN.y = y * tileSize;
faceW.next = faceS;
faceS.next = faceE;
faceE.next = faceN;
faceN.next = faceW;
}
