/// <summary>
/// Detects and resolves all collisions between the player and his neighboring
/// tiles. When a collision is detected, the player is pushed away along one
/// axis to prevent overlapping. There is some special logic for the Y axis to
/// handle platforms which behave differently depending on direction of movement.
/// </summary>
private void HandleCollisions()
{
// Get the player's bounding rectangle and find neighboring tiles.
Rectangle bounds = BoundingRectangle;
bounds.X -= offSetX;
bounds.Y -= offSetY;
int leftTile = (int)Math.Floor((float)(bounds.Left) / Tile.Width);
int rightTile = (int)Math.Ceiling(((float)(bounds.Right) / Tile.Width)) - 1;
int topTile = (int)Math.Floor((float)(bounds.Top) / ((float)Tile.Height * ((float)SCREENHEIGHT / 1200f)));
int bottomTile = (int)Math.Ceiling(((float)(bounds.Bottom) / ((float)Tile.Height * ((float)SCREENHEIGHT / 1200f)))) - 1;
bounds = BoundingRectangle;
// Reset flag to search for ground collision.
isOnGround = true;
// For each potentially colliding tile,
for (int y = topTile; y <= bottomTile; ++y)
{
for (int x = leftTile; x <= rightTile; ++x)
{
// If this tile is collidable,
TileCollision collision = Level.GetCollision(x, y);
if (collision != TileCollision.Passable)
{
// Determine collision depth (with direction) and magnitude.
Rectangle tileBounds = Level.GetBounds(x, y);
Vector2 depth = RectangleExtensions.GetIntersectionDepth(bounds, tileBounds);
if (depth != Vector2.Zero)
{
colliding = true;
}
else
{
colliding = false;
}
}
}
}
}
