HW_Array_BouncingBall

int numCircle = 50;

float[] cirX = new float[numCircle];

float[] cirY = new float[numCircle];

float[] directionX = new float[numCircle];

float[] directionY = new float[numCircle];

boolean balldirection = false;

​

void setup(){

  size(500, 500);

  smooth();

  noStroke();

  for(int i = 0; i < numCircle; i++){

    cirX[i] = 250;

    cirY[i] = 250;

    directionX[i] = random(2,10);

    directionY[i] = random(2,10);

  }

}

​

void draw(){

  background(255);

  fill(random(0,256), random(0,256), random(0,256), 100);

  for(int i=0; i < numCircle; i++){

  if ((cirX[i] > 500) || (cirX[i] < 0)){

    directionX[i] = -directionX[i];

  }

  if((cirY[i] > 500) || (cirY[i] < 0)){

    directionY[i] = -directionY[i];

  }

  ellipse(cirX[i], cirY[i], random(10,50), random(10,50));

​

  cirX[i] = cirX[i] + directionX[i];

  cirY[i] = cirY[i] + directionY[i];

   }

​

}

​