public Rect2 CalcValidArea(Rect2 rect)
{
//cell size is in 16 atm
int cellSize = 16;
//convert tilespace to worldspace
Rect2 worldTileSpace = new Rect2(floor.GetUsedRect().Position *cellSize, floor.GetUsedRect().Size *cellSize);
return(worldTileSpace.Clip(rect));
}