Lab3_flying bird

float cloudX=0;
float plus=1;
void draw(){
  size(500,500);
  background(#00AAFF);
  cloud();
  translate(mouseX,mouseY);
  strokeWeight(1.5);
  bird();
}
void bird(){
  rotate(PI/5);
  fill(#FF0000);
  ellipse(0,-25,10,20);  //hair
  ellipse(-10,-25,10,20);
  rotate(-PI/5);
  wing();
  ellipse(0,0,50,50);    //body
  fill(#FFFF00);
  arc(0,0,50,50,PI/4,3*PI/4);
  fill(255);
  ellipse(-10,-5,15,10); //left eye
  fill(0);
  ellipse(-10,-5,5,5);
  fill(255);
  ellipse(10,-5,15,10);  //right eye
  fill(0);
  ellipse(10,-5,5,5);
  triangle(0,0,-10,10,10,10); //beak
}
void wing(){
  float roll;
  if((frameCount%50)<=25) roll=PI/16;
  else roll=-PI/16;
  rotate(roll);
  ellipse(-30,0,50,20);  //left wing
  rotate(-2*roll);
  ellipse(30,0,50,20);   //right wing
  rotate(roll);
}
void cloud(){
  noStroke();
  fill(255);
  ellipse(510-cloudX,100,100,30);
  ellipse(30+cloudX,175,120,60);
  ellipse(450-cloudX,300,75,50);
  ellipse(100+cloudX,275,85,45);
  ellipse(350-cloudX,405,215,140);
  stroke(0);
  cloudX+=plus;
  if (cloudX>=450) plus*=-1;
  else if (cloudX<=-50) plus*=-1;
}