Starry Night

int numCircles=50;

float gravity= 0.95;

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float circleX[] = new float[numCircles];

float circleY[] = new float[numCircles];

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float velX[] = new float [numCircles];

float velY[] = new float [numCircles];

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void setup() {

  size(500,700);

  smooth();

  noStroke();

  fill(255);

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

  circleX[i] = random(10,width-10);

  circleY[i] = random(10,height-10);

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  velX[i] = random(3);

  velY[i] = random(3);

  }

}

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void draw() {

  background(1);

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

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    circleX[i] = circleX[i] +velX[i];

    circleY[i] = circleY[i] +velY[i];

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    if((circleX[i] <= 10)||(circleX[i]>=width-10)) {

      velX[i] = velX[i] * -1;

    }

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    if(circleY[i] <= 10) {

      velY[i] = velY[i] * -1;

    }

    if(circleY[i]>=height-10) {

      velY[i] = velY[i] * -0.95;

    }

    ellipse(circleX[i],circleY[i], random(20), random(20));

  }

}

​