Animation01

int x = 20;             // for moving ellipse horizontally!

int y = 20;             // for moving ellipse vertically! 

​

void setup(){

  size (400, 400);

}

​

void draw (){

​

  // put background in *draw* if you want the ellipse to move across screen

  // you would put it in setup if you want it to leave a trail behind it 

  background ( 255, 255, 0);            // yellow!

  // only the x co-ordinate moves

  fill (255, 0, 0);                   // red

  ellipse (x, 20, 30, 30);            // moves horizontally (left to right)

  // only the y co-ordinate moves

  fill (0, 255, 0);                   // green

  ellipse (20, y, 30, 30);            // moves vertically (top to bottom)

  // both the x and the y co-ordinates move

  fill (0, 0, 255);                   // blue

  ellipse (x, y, 30, 30);             // moves diagonally (top left to bottom right)

  // move the x coordinate +1 pixel (goes left)

  x = x+1;

  // move the y co-ordinate +1 pixel (goes down)

  y = y+1;

​

}