public QuadTree(int level, Rectangle bounds)
{
this.level = level;
this.bounds = bounds;
this.objects = new List<ICollidable>();
this.nodes = new QuadTree[4];
}
public static bool Intersects(Rectangle rectA, Rectangle rectB)
{
return rectA.TopLeft.X < rectB.BottomRight.X &&
rectA.BottomRight.X > rectB.TopLeft.X &&
rectA.TopLeft.Y < rectB.BottomRight.Y &&
rectA.BottomRight.Y > rectB.TopLeft.Y;
}
/*
* Return all objects that could collide with the given object
*/
public List<ICollidable> GetItemsInRange(List<ICollidable> returnObjects, Rectangle bounds)
{
int index = this.GetIndex(bounds);
if (index != -1 && this.nodes[0] != null)
{
this.nodes[index].GetItemsInRange(returnObjects, bounds);
}
returnObjects.AddRange(this.objects);
return returnObjects;
}
public Engine(int worldWidth,
int worldHeight,
IObjectGenerator<EnvironmentObject> objectGenerator,
ICollisionHandler collisionHandler,
IRenderer renderer)
{
this.objects = new List<EnvironmentObject>();
this.objectGenerator = objectGenerator;
this.renderer = renderer;
this.collisionHandler = collisionHandler;
this.worldBounds = new Rectangle(0, 0, worldWidth, worldHeight);
}
/*
* Determine which node the object belongs to. -1 means
* object cannot completely fit within a child node and is part
* of the parent node
*/
private int GetIndex(Rectangle pRect)
{
int index = -1;
double verticalMidpoint = this.bounds.TopLeft.X + (this.bounds.Width / 2);
double horizontalMidpoint = this.bounds.TopLeft.Y + (this.bounds.Height / 2);
// Object can completely fit within the top quadrants
bool withinTopQuadrant = pRect.TopLeft.Y < horizontalMidpoint && pRect.TopLeft.Y + pRect.Height < horizontalMidpoint;
// Object can completely fit within the bottom quadrants
bool withinBottomQuadrant = pRect.TopLeft.Y > horizontalMidpoint;
// Object can completely fit within the left quadrants
if (pRect.TopLeft.X < verticalMidpoint && pRect.TopLeft.X + pRect.Width < verticalMidpoint)
{
if (withinTopQuadrant)
{
index = 1;
}
else if (withinBottomQuadrant)
{
index = 2;
}
}
// Object can completely fit within the right quadrants
else if (pRect.TopLeft.X > verticalMidpoint)
{
if (withinTopQuadrant)
{
index = 0;
}
else if (withinBottomQuadrant)
{
index = 3;
}
}
return index;
}
public Explosion(Rectangle bounds)
: base(bounds)
{
}
protected EnvironmentObject(Rectangle bounds)
{
this.Bounds = bounds;
this.Exists = true;
}
public Snow(Rectangle bounds)
: base(bounds)
{
}
public Star(Rectangle bounds) : base(bounds)
{
}
public Tail(Rectangle bounds)
: base(bounds)
{
}
public Snow(Rectangle rect)
: base(rect)
{
this.ImageProfile = new char[,] { { '.' } };
this.CollisionGroup = CollisionGroup.Snow;
}
public MeltedSnow(Rectangle bounds)
: base(bounds)
{
}
public Snow(Rectangle rect)
: base(rect)
{
this.ImageProfile = this.GenerateImageProfile();
this.CollisionGroup = CollisionGroup.Snow;
}