Screensaver

float circleY;

float circleX;

​

float rad = 15;

​

float xspeed = 3;

float yspeed = 3.2;

​

int xdirection = 1; 

int ydirection = 1; 

​

void setup() {

  frameRate(300);

  ellipseMode(RADIUS);

  size(800,550);

  circleY = width/2;

  circleX = height/2;

  noStroke();

}

​

void draw() {

  fill(circleX / 3, circleY * 0.8, 122 );

  background(circleY * 0.8, circleX / 3, 200);

​

  circleX = circleX + (xspeed * xdirection);

  circleY = circleY + (yspeed * ydirection);

  //bounce back on left and right corners 

  if (circleX < rad || circleX > width - rad) {

    xdirection *= -1; 

  }

  //bounce back on bottom and top corner

  if (circleY > height - rad || circleY < rad) {

    ydirection *= -1;

  }

​

  strokeWeight(6);

  stroke(255);

  ellipse(circleX, circleY, rad, rad);

}