Given a (x,y) coordinate this function returns whether this gridcell is
walkable or not based on the position being located within the world and
whether the cell is walkable (not a building (stage,bar,toilet))
Note overloaded function!
Given a GridPoint (x,y) coordinate this function returns whether this gridcell is
walkable or not (so if CellObjects are on it)
Note verloaded function!
width -
Variable in class crowdmodel.agents.Sensor
Function that decides whether a heading (beta) lies within line of sight given a
current heading (myheading) and a range inbetween the value is supposed to lie.