public bool HandleCollision(GameObject other, bool applyForce = true)
{
Vector2 en1Center = Position;
int en1Radius = (Height + Width) / 4; // Average of height and width divided by 2 => 4
Vector2 en2Center = other.Position;
int en2Radius = (other.Height + other.Width) / 4; // Average of height and width divided by 2 => 4
Vector2 diffVector = en1Center - en2Center; // From en2 to en1
int distance = (int)diffVector.Length();
//Collision?
if (distance >= en1Radius + en2Radius || distance == 0) return false;
if (applyForce)
{
int moveDistance = (en1Radius + en2Radius) - distance;
diffVector /= distance;
diffVector *= moveDistance / 2.0f;
Position += diffVector;
other.Position -= diffVector;
}
//Die on collision code
if (other.Team != Team && other.DestroyOnCollsion != DestroyOnCollsion && !(other is Particle) && !(this is Particle))
{
if (other.DestroyOnCollsion)
{
if (this is Entity && other is Entity) (this as Entity).Score += (int)(other as Entity).MaxHealth*5;
other.Destroy();
}
if (DestroyOnCollsion)
{
if (this is Entity && other is Entity) (other as Entity).Score += (int) (this as Entity).MaxHealth*5;
Destroy();
}
}
return true;
}
/// <summary>
/// Detects and handles collision between GameObjects and the World.
/// </summary>
/// <param name="gameObject"></param>
/// <returns>true if there occured an collision</returns>
public bool WorldCollision(GameObject gameObject)
{
bool hasCollided = false;
Point entityInTile = GetSquareAtPixel(gameObject.Position);
// Collision detect in a 5x5 grid to where you are
for (int i = 0; i < 5; ++i)
{
for (int j = 0; j < 5; ++j)
{
hasCollided |= HandleTileCollision(gameObject, new Vector2(entityInTile.X + (i - 2), entityInTile.Y + (j - 2)));
}
}
return hasCollided;
}
private bool HandleTileCollision(GameObject gameObject, Vector2 tile)
{
//Prevent array out of bounds
if (tile.X < 0 || tile.Y < 0 || tile.X >= MapWidth || tile.Y >= MapHeight) return false;
//Is the tile collidable?
if (!_mapSquares[(int)tile.X, (int)tile.Y].BlocksMovement) return false;
Vector2 collisionTileCenter = GetSquareCenter(tile);
int collisionTileRadius = TileWidth / 2;
Vector2 entityCenter = gameObject.Position;
int entityRadius = (gameObject.Height + gameObject.Width) / 4;// Average of height and width divided by 2 => 4
entityRadius -= 8; // Make it possible to pass between tiles
Vector2 diffVector = entityCenter - collisionTileCenter; // Tile to Entity
int distance = (int)diffVector.Length();
//Collision?
if (distance < collisionTileRadius + entityRadius)
{
int moveRadius = (collisionTileRadius + entityRadius) - distance; // how long to move to not collide any more
diffVector /= diffVector.Length();
Vector2 moveVector = diffVector * moveRadius;
gameObject.Position += moveVector;
return true;
}
return false;
}
public Point? GetCollidedTile(GameObject gameObject)
{
Point entityInTile = GetSquareAtPixel(gameObject.Position);
// Collision detect in a 5x5 grid to where you are
for (int i = 0; i < 5; ++i)
{
for (int j = 0; j < 5; ++j)
{
if (HandleTileCollision(gameObject, new Vector2(entityInTile.X + (i - 2), entityInTile.Y + (j - 2))))
{
return new Point(entityInTile.X + (i - 2), entityInTile.Y + (j - 2));
}
}
}
return null;
}
