Hi,

Im trying to program a game with moving balls in the screen. I´ve already make a ball moving and bouncing in the screen. I want to introduce more balls at the same time. I know its better to make it with objects but I want to start doing it with an array.

I´ve made the same program I used with a ball, but I,ve defined an array of balls, but when it comes to the setup function it have an error an displays: "unexpected token: void"

This is the code:

Code:

int[] x=new int [3];
x[0]=150;
x[1]=30;
x[2]=150;
int[] y=new int [3];
y[0]=150;
y[1]=350;
y[2]=350;
int r=10;
int[] incx=new int [3];
incx[0]=1;
incx[1]=1;
incx[2]=1;
int[] incy=new int [3];
incy[0]=1;
incy[1]=1;
incy[2]=1;
int i;

void setup(){
  size(700,700);
  background(0);
  stroke(255);
  smooth();
  frameRate(100);
}




void draw() {
  background(0);
  for (i=0;i<=2;i++){
    ellipse(x[i],y[i],r,r);
    if ((x[i]>699)||(x[i]<1)){
	incx[i]=incx[i]*(-1);
    }
    if ((y[i]>699)||(y[i]<1)){
	incy[i]=incy[i]*(-1);
    }
    x[i]=x[i]+incx[i];
    y[i]=y[i]+incy[i];
  } 
}
 

Thank you, I've made it and it works, but I don't understand the reason because for example I make int r=10; outside the setup. I declare and inicialize outside, and what I did with the array was the same, I think it should work.

I also don't understand why my balls bounce between them, they're not programmed to do that, they should bounce only if their coordenates pass some values.

There's also another benefit to initialising your variables in a method.  When you want to reset your game (e.g. to start a new game after 'game over'...) you simply call this method to set all the variables back to their starting values.  I gather from a post by PhilHo that you shouldn't simply call setup again; so you'd need to create a separate method and call it from setup().   For example:

Code:

int foo;
int[] bar = new int[3];

void setup() {
  size(300,200);
  setGameStartValues():
}

void setGameStartValues() {
  foo = 3;
  for(int i=0;i<3;i++) {
    bar[i] = 100 + i*50;
  }
  
}


void draw() {
  // do stuff...
  if(gameOver) {
    setGameStartValues();
  } 
}