If(!getSnakeHead.isEmpty ()) //if there is no SnakeHead List getSnakeHead=getWorld().getObjects(SnakeHead.class) //get the SnakeHead actor from the world. Public int offsetY = 0 //global variable storing the random Y direction (0) Public int offsetX = 0 //global variable storing the random X direction (0) * Write a description of class SnakeBody here. In the SnakeHead class, the array, or list, of body segments can be declared with:

With the reverse list, the body segments can have an instance 'int' variable to indicate where in the list it resides (and this value will not ever change), so it can find its leader. You should also have an instance 'int' variable in the SnakeHead class to keep track of how many body segments there are. You could instead, do a reverse list, where the last item on the list would be the segment immediately behind the head of the snake then, you only need to append the segment to the end of the list. Prepare: process keys and set direction before the followingġ) move the head only (you could save location (x and y) of head first)Ģ) check for food, eat if present, and return findingģ) if no food was eaten, then move the rest of the snake Įlse, add new body segment at saved x-y (or the saved x-y of first body segment, which should be where the head moved from) and adjust 'following' of old first body segment, shift all array entries down one and add new segment to front of list, setting its 'following' to the head. You could have the findEatFood() method return a boolean to signify that food had been found (or not), and base the addSnakeBody method call on that. Secondly the addSnakeBody method call within the act() method is not being regulated (you do not know if anything has been eaten or not). If both values are 0 then do nothing, both value will forever be 0, and you are stuck in the loop (you can just remove that statement). Return true //this must be at the end â€“ if canMove got this far it didn't find any of the listed objects.įirst off, I do not like the looks of line 66, at all. If(!foundWall.isEmpty ())return false //if Wall found return false and stop otherwise continue List foundWall = getWorld().getObjectsAt(x,y, Wall.class) //canMove is false if a Wall is found GetWorld().addObject(new Food(), x, y) //add new object at a random co-ordinate Int y = Greenfoot.getRandomNumber(29) //random y co-ordinate Int x = Greenfoot.getRandomNumber(29) //random x co-ordinate GetWorld().removeObject(thisFood) //removes an actor from the world once it has been eaten. Specifically FoodĪctor thisFood=getOneObjectAtOffset(0,0,Food.class) // is there Food in the current square? Private void findEatFood()// funcion to eat an actor. SetRotation(180) //set rotation to southĮlse if(offsetX = 0 & offsetY = -1) //if the lizard will go northĮlse if(offsetX = 0 & offsetY = 1) //if the lizard will go southĮlse if(offsetX = 1 & offsetY = 0) //if the lizard will go east If(offsetX = -1 & offsetY = 0) //if the snake will go west SetLocation(currX + offsetX, currY + offsetY) //if the snake can move it will move in a direction If(canMove(currX + offsetX, currY + offsetY)) If(Greenfoot.isKeyDown('down')) //move down If(Greenfoot.isKeyDown('right')) //move right If(Greenfoot.isKeyDown('left')) //move left Int currY = getY() // get current y co-ordinate Int currX = getX() //get current x co-ordinate SetDirection() //set a direction for the lizard. Int offsetY = -1 //global variable storing the random Y direction (1, 0 or -1) Int offsetX = 0 //global variable storing the random X direction (1, 0 or -1)

* Write a description of class SnakeHead here. Import greenfoot.* // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

Greenfoot play sound code