Lab3_balloon(lecture)

void draw(){
  size(150,400);
  background(255);
  draw_balloon();
}
void draw_balloon(){
  int posY=mouseY;
  color ball;
  if(mouseY<=50){
    posY=50;
    ball=#00FF00;
  }
  else if(mouseY>=300){
    posY=300;
    ball=#FF0000;
  }
  else ball=255;
  strokeWeight(1.5);
  fill(ball);
  line(width/2,posY,width/2,posY+100);
  ellipse(width/2,posY,50,50);
}