// return a list of all potential collision you may be going through
public static CollisionInfo[] BroadPhase(Entity owner, Box2D sweep)
{
m_cachedList.Clear();
// first, increase the sweep box so that it covers all the tile it is touching
Box2D fullCover = sweep;
fullCover.Left = Mathf.Floor(fullCover.Left);
fullCover.Right = Mathf.Ceil(fullCover.Right);
fullCover.Top = Mathf.Ceil(fullCover.Top);
fullCover.Bottom = Mathf.Floor(fullCover.Bottom);
// 0.9 is not a typo, it's just using a large epsilon which is currently fine because our sweep box is currently always at least one tile large
DebugUtils.Assert(fullCover.Width >= 0.99);
DebugUtils.Assert(fullCover.Height >= 0.99);
if (Input.GetKeyDown(KeyCode.F10))
{
DrawCollision = !DrawCollision;
}
// check against world
for (float i = fullCover.Left; i + 0.9f < fullCover.Right; i += 1.0f)
{
for (float j = fullCover.Bottom; j + 0.9f < fullCover.Top; j += 1.0f)
{
if (DrawCollision)
{
DebugUtils.DrawRect(new Vector2(i, j), new Vector2(i + 1.0f, j + 1.0f), Color.blue);
}
Vector2 checkVector = new Vector2(i + 0.5f, j + 0.5f);
TileInfo ti = GameManager.Instance.GetTileFromWorldPos(checkVector);
ETile tile = ti.Tile;
if (WorldTile.IsCollision(tile))
{
Box2D box2d = new Box2D(i, j + 1.0f, i + 1.0f, j);
m_cachedList.Add(new CollisionInfo(null, box2d, CollisionFlags.Wall));
}
// check entity as well
// TODO: This does a double lookup from above
List <Entity> entities = GameManager.Instance.GetEntitiesFromWorldPos(checkVector);
if (entities == null)
{
continue;
}
foreach (Entity entity in entities)
{
// pair-wise check must be done once only to avoid obtaining multiple collisions
if (entity.Id <= owner.Id)
{
continue;
}
Box2D box2d = entity.Box;
if (entity is ItemInstance)
{
m_cachedList.Add(new CollisionInfo(entity, box2d, CollisionFlags.Item));
}
else
{
m_cachedList.Add(new CollisionInfo(entity, box2d, CollisionFlags.None));
}
}
}
}
// let's draw all collisions
if (DrawCollision)
{
foreach (var ci in m_cachedList)
{
ci.Box.Draw(Color.white);
}
}
return(m_cachedList.ToArray());
}
