Step II: Building the agents
foodSpace = [FoodSpace createBegin: globalZone];
[foodSpace setSizeX: worldXSize Y: worldYSize];
foodSpace = [foodSpace createEnd];
[foodSpace seedFoodWithProb: seedProb];
aBug = [Bug createBegin: globalZone];
[aBug setWorldSizeX: worldXSize Y: worldYSize];
[aBug setFoodSpace: foodSpace];
[aBug setX: xPos Y: yPos];