PImage heli;
PImage backgrd;
PImage station;
PImage bigheli;

//Heli 
int xpos;
int ypos;

int speed = 1/2;
int direction = 0;
//color
int c1 ;
int c2 ; 

int c1dir = 40;
int c2dir = -40;

int start = 3;

//Button
PButton button;
PFont font;
boolean fly;

void setup(){
  framerate(25);
  heli = loadImage("hilicopter.PNG");
  backgrd = loadImage("bkgrd1.PNG");
  station = loadImage("station.PNG");
  bigheli = loadImage("hilicopterbig.PNG");
  
  //Heli
  xpos = 160;
  ypos = 218;
  //Button
  button = new PButton("Ready To FLY ");
  //Calculating button size accordin to text size
  button.calculateBounds(0, 0, width, height);
  //Setting the position of the button
  button.setBounds((width - button.width) / 2, 
                   (height - button.height)-30, 
                   button.width, 
                   button.height);
  
  button.initialize();
  
 
  font = loadFont();
  textFont(font);
  textAlign(CENTER);
}
                
void draw(){
  switch(start){
    case 0:
    c1 = 255;
    c2 = 255;
    c1dir = 0;
    c2dir = 0;
  background(0);
  image(station,145,231);
  helicopter();
  softkey("Engine On");
  image(backgrd,0,0);
    break;
    case 1:
  background(0);
  image(station,145,231);
  helicopter();
  image(backgrd,0,0);
  //Boundaries
   if ( xpos <= 0 || xpos+24 >= width){
    direction*= -1;
    }
  
   ypos = ypos + speed;
   xpos = xpos + direction;
   
    break;
    case 3:
    background(255);
    image(bigheli,0,0);
     button.draw();
    if (fly) {
      start = 0;
    }

  }
}

void helicopter(){
  
   image(heli,xpos,ypos);
   noStroke();
   fill(c1);
   rect(xpos+5,ypos+12,10,1);
   fill(c2);
   rect(xpos+18,ypos+12,10,1);
   //Color varying
   c1 = c1 + c1dir;
   c2 = c2 + c2dir;
   if( c1 < 0 || c1 > 255){
     c1dir*= -1;
   }
   if (c2 < 0 || c2 > 255) {
    c2dir *= -1;
   }
   
}

void keyPressed(){
   if (keyCode == UP){
    speed = speed -1;
    }
   else if (keyCode == DOWN){
    speed = speed + 1;
   }
   else if (keyCode == LEFT){
    direction = direction - 1;
   }
   else if (keyCode == RIGHT){
    direction = direction + 1;
   }
   
   button.keyPressed();
}

void softkeyPressed(String label){
    if (label.equals("Engine On")){
    start = 1;
    
    c1 = 0;
    c2 = 255;
    
    c1dir= 40;
    c2dir= -40;
   
  }
}

void keyReleased() {
  button.keyReleased();
}

void libraryEvent(Object library, int event, Object data) {
  if (library == button) {
    //// if the button sent a library event, it was pressed!
    fly = !fly;
  }
}