array

int numCircle = 50;

​

​

float [] ballX = new float [numCircle];

float [] ballY = new float [numCircle];

float [] speed1 = new float [numCircle];

float [] speed2 = new float [numCircle];

​

void setup() {

  size(500, 500); 

  smooth();

  noStroke(); 

​

  for (int i = 0; i < numCircle; i = i + 1) {

    ballX [i] = random(width);

    ballY [i] = random(height);

    speed1 [i] = random(1, 5);

    speed2 [i] = random(1, 10);

  }

}

​

​

void draw() {

  background (0, 0, 255); 

  for (int i = 0; i < numCircle; i = i + 1) {

    ellipse (ballX [i], ballY [i], 25, 50);

​

    if (ballX [i]>=width || ballX [i]<=0) {

      speed1 [i] = speed1 [i] * (-1);

    }

​

    if (ballY [i]>=height || ballY [i]<=0) {  

      speed2 [i] = speed2 [i] * (-1);

    }

    ballX [i] = ballX [i] + speed1 [i];

    ballY [i] = ballY [i] + speed2 [i];

  }

}

​

​

​

​

​