C++ (Cpp) Door::GetOpening Beispiele

Beispiel #1

Datei: Raycaster.cpp Projekt: richi902/FurbyKill-3D

//
// CastThroughIntersections
//
float Raycaster::CastThroughIntersections(float angle, IntersectionDir dir, int *texIndex, float *texelX)
{
	float fx, fy;
	float dx, dy;
	float distance;
	float a, b;
	int mapX, mapY;
	
	switch(dir)
	{
		case ID_HORIZONTAL:
			
			if(UP(angle))
			{
				fy = -(posY - (int)posY);
				dy = -1;
			}
			else
			{
				fy = (int)posY + 1 - posY;
				dy = 1;
			}
	
			fx = (float)(ABS(fy)) / (float)(TAN(angle));
			dx = (float)(ABS(dy)) / (float)(TAN(angle));
	
			fx = ABS(fx);
			dx = ABS(dx);
	
			if(LEFT(angle))
			{
				dx = -dx;
				fx = -fx;
			}
	
			fx = posX + fx;
			fy = posY + fy;
			
			break;
			
		case ID_VERTICAL:
			
			if(LEFT(angle))
			{		
				fx = -(posX - (int)posX);
				dx = -1;
			}
			else
			{
				fx = (int)posX + 1 - posX;
				dx = 1;
			}
	
			fy = (float)(TAN(angle)) * (float)(ABS(fx));
			dy = (float)(TAN(angle)) * (float)(ABS(dx));
	
			fy = ABS(fy);
			dy = ABS(dy);
	
			if(UP(angle))
			{
				fy = -fy;
				dy = -dy;
			}
	
			fx = posX + fx;
			fy = posY + fy;
			
			break;
	}
	
	while(true)
	{		
		mapY = (int)fy;
		mapX = (int)fx;
		
		if(dy == -1 && dir == ID_HORIZONTAL)
			mapY -= 1;
		else if(dx == -1 && dir == ID_VERTICAL)
			mapX -= 1;
		
		if(mapX < 0 || mapY < 0 || mapX >= mapW || mapY >= mapH)
			break;
		else if(map[mapY][mapX] > 0 && map[mapY][mapX] != DOOR_INDEX && map[mapY][mapX] != LOCKED_DOOR_INDEX)
		{
hit:
			if(dir == ID_HORIZONTAL)
				*texelX = fx - (float)mapX;
			else
				*texelX = fy - (float)mapY;
			
			*texIndex = map[mapY][mapX] - 1;
			break;
		}
		else if(map[mapY][mapX] == DOOR_INDEX || map[mapY][mapX] == LOCKED_DOOR_INDEX)
		{
			Door *door = GetDoorAt(mapX, mapY);
			
			if(door->GetOpening() || door->GetClosing())
			{
				float xval;
			
				if(dir == ID_HORIZONTAL)
					xval = fx - (float)mapX;
				else
					xval = fy - (float)mapY;
			
				if(door->GetOpenedWidth() < xval)			
					goto hit;
			}
			else if(!door->IsOpen())
				goto hit;
		}
		
		fx += dx;
		fy += dy;
	}
	
	a = ABS((fy - posY));
	b = ABS((fx - posX));
	
	distance = sqrt(a*a+b*b);
	
	return distance;
}