Drawing_Order_Planets.pde

float theta;
boolean over;
void setup() {
  size(400, 400);
  theta = HALF_PI;
  over = true;
}

void draw() {
  background(0);
  float bx = 200 + cos( theta ) * 150;
  float by = 200 + sin( theta ) * 20;
  float bd = 35 / (-sin(theta)+2);
  if( !over ){
    fill(#3DC6FA);
    ellipse( bx, by, bd, bd );
  }
  fill(#FFAA3B);
  ellipse( 200, 200, 170, 170 );
  if( over ){
    fill(#3DC6FA);
    ellipse( bx, by, bd, bd );
  }
  
  float pt = theta;
  theta += 0.02;
  if ( theta > PI && pt < PI ) {
    over = false;
  } else if ( theta > TWO_PI ) {
    theta = 0;
    over = true;
  }
}