Greenfoot

Question 1

How do you register a key input?

Answer 1

public void movement()
if (Greenfoot.isKeyDown("x"))
{
   //code
}
x = right, left, up, down

Question 2

How do you create and call on functions to public void act?

Answer 2

Make it =  public void anthingYouWant() 
{
   //code
}

Call on it in public void act = anythingYouWant();

Question 3

How do you add movement?

Answer 3

public void movement()
{
if(Greenfoot.isKeyDown("right"))
{
    setLocation(getx()+3,getY());
    //or
    setRotation();
    move(5);
}
if(Greenfoot.isKeyDown("left"))
{
   setLocation(getX() -3,getY());
   //or
   setRotation(180);
   move(5);
}
if(Greenfoot.isKeyDown("down"))
{
  setLocation(getX(),getY()+3)
  //or
  setRotation(270);
  move(5);
}
if(Greenfoot.isKeyDown("up"))
{
 setLocation(getX(),getY()-3))
  //or
  setRotation(90);
  move(5);
}

Question 4

How to add hit detection? And how to make an object disappear.

Answer 4

if (isTouching(x.class))
{
    removeTouching(x.class);
}
x = name of the class you want to remove

Question 5

How to get a random number generator (RNG).

Answer 5

move(Greenfoot.getRandomNumber(20));
turn(Greenfoot.getRandomNumber(180)-90);
//these numbers can be changed

Question 6

How to add sound?

Answer 6

Greenfoot.playSound(“pop.wav”);
pop = name of file
wav = file types, could be MP3 ect…

Question 7

Very complex and annoying random movement

Answer 7

if (Greenfoot.getRandomNumber(2) < 1)
        {
            move(1);
        }
        if (Greenfoot.getRandomNumber(10)< 1)
        {
            turn(Greenfoot.getRandomNumber(90)-45);
        }

Question 8

How do you add boarder collision?

Answer 8

if (getX() == 7)
        {
            turn(180);
        }
        if (getX() == 0)
        {
            turn(180);
        }
        if (getY() == 7)
        {
            turn(180);
        }
        if (getY() == 0)
        {
            turn(180);
        }

Question 9

How do you add a scoring system?

Answer 9

EXAMPLE
//In counter
public x()
    {
        setImage(new GreenfootImage("0", 20, Color.WHITE, Color.BLACK));
    }

public void x(int amount)
    {
        totalCount += amount;
        setImage(new GreenfootImage("" + totalCount, 20, Color.WHITE, Color.BLACK));
    }

//In player
if (isTouching(Iceberg.class))
        {
            x counter =(x) getWorld().getObjects(x.class).get(0);
            counter.y(1);

    }

Question 10

What is the superclass?

Answer 10

It’s the main name and the route of other items
They are the:
“World”
“Actor”

Question 11

What is the class?

Answer 11

The items in the code.
“Ants”
“Rockets”
“Points”

Question 12

What is a private property?

Answer 12

A single of data that only one class cam use. 
E.g. totalCount; (For a counter)

Question 13

What is a comment?

Answer 13

Anything with a /** before it and */ after

Question 14

What is a method that runs each frame?

Answer 14

The “act()” method