public bool IsOnGround(Collision collision, Scene currentScene)
{
var bottomLeft = new Vector2(Aabb.GetLeft(), Aabb.GetBottom());
var bottomRight = new Vector2(Aabb.GetRight(), Aabb.GetBottom());
int tileWidth = 32;
int initialX = (int)bottomLeft.X / tileWidth;
int numTiles = (int)(bottomRight.X - bottomLeft.X) / tileWidth;
/// we add one here so that we can test the area immediately UNDER the AABB
int yIndex = (int)(bottomLeft.Y + 1) / tileWidth;
return(Enumerable
.Range(initialX, initialX + numTiles) // x indices
.Select(x => currentScene.GetTile(new Point(x, yIndex))) // tiles in the x range
.SelectMany(tile => tile.GetLocalEntities()) // entities in the tile
.Where(entity => entity.IsCollideable()) // collidable only
.Any(entity => Enumerable // do they actually collide?
.Range((int)bottomLeft.X, (int)bottomRight.X) // x indices
.Select(x => new Vector2(x, bottomLeft.Y + 1)) // vector coords
.Any(v => collision.PointCollisionCheck(v, entity)) // collision check
));
}
public bool IsOnGround(Collision collision, Scene currentScene)
{
// var center = new Vector2(coordinates.X + Aabb.GetWidth() / 2, coordinates.Y + Aabb.GetHeight() / 2);
var bottomLeft = new Vector2(Aabb.GetLeft(), Aabb.GetBottom());
var bottomRight = new Vector2(Aabb.GetRight(), Aabb.GetBottom());
List <Entity> localCollideables = new List <Entity>();
/// we add 32 because that's the width of one tile
for (var checkedTile = bottomLeft; ; checkedTile.X += 32)
{
// skip back to the closest tile if we're past the edge of the test line
checkedTile.X = Math.Min(checkedTile.X, bottomRight.X);
Point tileIndex = new Point((int)(checkedTile.X / 32), (int)(bottomLeft.Y / 32));
foreach (Entity localEntity in currentScene.GetTile(tileIndex).GetLocalEntities())
{
if (localEntity.IsCollideable())
{
localCollideables.Add(localEntity);
}
}
if (checkedTile.X >= bottomRight.X)
{
break;
}
}
for (var x = bottomLeft.X; x <= bottomRight.X; x++)
{
foreach (Entity collideableEntity in localCollideables)
{
if (collision.PointCollisionCheck(new Vector2(x, bottomLeft.Y + 1), collideableEntity))
{
return(true);
}
}
}
return(false);
}