Lab4 Flock birds

float wing_y;
float bird_y;
int size_draw = 40;
boolean wing_up;
boolean wing_down;
int max_bird = 3;

void setup() {
  size(600, 600);
  background(255);
  mouseX=width/2;
  mouseY=height/2;
  wing_up = true;
}

void draw() {
  int present_bird = 1;
  int X = 0;
  int Y = 0;
  background(255);

  if (mouseY<size_draw*2) {
    mouseY=size_draw*2;
  }
  if (mouseX<size_draw) {
    mouseX = size_draw;
  }

  while (present_bird <= max_bird) {
    draw_bird(mouseX+X, mouseY+Y, size_draw, bird_y);
    X += size_draw*3;
    if (present_bird%4==0) {
      X=0;
      Y-=size_draw*1.1;
    }
    present_bird++;
  }

  if (wing_up == true) {
    wing_y-= size_draw*0.15;
    bird_y-= size_draw*0.01;
    if (wing_y <= -(size_draw*0.7)) {
      wing_up = false;
      wing_down = true;
    }
  }

  if (wing_down == true) {
    wing_y+= size_draw*0.15;
    bird_y+= size_draw*0.01;
    if (wing_y >= (size_draw*0.7)) {
      wing_up = true;
      wing_down = false;
    }
  }
}

void draw_bird(float mouse_x, float mouse_y, float s_draw, float bird_y) {
  fill(#D30327);
  strokeWeight(s_draw*0.2);
  line(mouse_x, mouse_y-(s_draw*0.5), mouse_x-(s_draw*1.3), mouse_y+wing_y-(s_draw*0.5));//left wing
  line(mouse_x, mouse_y-(s_draw*0.5), mouse_x+(s_draw*1.3), mouse_y+wing_y-(s_draw*0.5));//right wing
  strokeWeight(s_draw*0.05);
  ellipse(mouse_x, mouse_y-(s_draw*0.5)+bird_y, s_draw, s_draw);//body
  strokeWeight(1);
  fill(255);
  ellipse(mouse_x-(s_draw*0.22), mouse_y-(s_draw*0.6)+bird_y, s_draw*0.3, s_draw*0.35);//left white eye
  ellipse(mouse_x+(s_draw*0.22), mouse_y-(s_draw*0.6)+bird_y, s_draw*0.3, s_draw*0.35);//right white eye
  fill(0);
  ellipse(mouse_x-(s_draw*0.22), mouse_y-(s_draw*0.6)+bird_y, s_draw*0.1, s_draw*0.1);//left black eye
  ellipse(mouse_x+(s_draw*0.22), mouse_y-(s_draw*0.6)+bird_y, s_draw*0.1, s_draw*0.1);//right black eye
  fill(#F9BC09);
  triangle(mouse_x-(s_draw*0.17), mouse_y-(s_draw*0.35)+bird_y, mouse_x+(s_draw*0.17), mouse_y-(s_draw*0.35)+bird_y, mouse_x, mouse_y-(s_draw*0.05)+bird_y); //mounth
}

void keyPressed() {
  if (keyCode==UP) {
    size_draw++;
    if (size_draw>=90)size_draw=90;
  }
  if (keyCode==DOWN) {
    size_draw--;
    if (size_draw<=20)size_draw=20;
  }
}
void mousePressed() {
  if (mouseButton == LEFT) {
    max_bird++;
  } else if (mouseButton == RIGHT) {
    max_bird--;
    {
      if (max_bird<=1)max_bird=1;
    }
  }
}