//pretty colour crackdown

int RESET_TIME = 30 * 30;
int framesTilFree = 0;
HashSet invaders = new HashSet();
HashSet deadvaders = new HashSet();
HashSet bullets = new HashSet();

void setup(){
  size(500,500); 
  frameRate(30);
  resetgame(); 
}

void resetgame(){
  for(int i = 0;i < 500; i++){
    invaders.add(new Invader(random(width),random(height), color(random(255),random(255),random(255)),random(width/100,width/33),random(width/500,width/125),random(.05,.1)));
  }
}

void keyPressed(){
   if(key == ' '){
  for(int i = 0;i < 100; i++){
    invaders.add(new Invader(random(width),random(height), color(random(255),random(255),random(255)),random(width/100,width/33),random(width/500,width/125),random(.05,.1)));
  }    
   } 
}


void draw(){
  background(50);
  
  framesTilFree++;
  
  if(frameCount % 3 == 0){
     if(mousePressed){bullets.add(new Bullet());}
 
  }
  
  Iterator it = invaders.iterator();
  while(it.hasNext()){
    Invader i = (Invader)it.next();
    i.move();
    i.draw();
  }  
  Iterator bi = bullets.iterator();
  while(bi.hasNext()){
     Bullet b = (Bullet)bi.next();

    boolean killb = false;
     it = invaders.iterator();
  while(it.hasNext()){
    Invader i = (Invader)it.next();
    if(      sqrt(   pow(i.x -b.x,2) + pow(i.y -b.y,2)      )      <  (b.SIZE+i.SIZE)/2){
       it.remove(); 
       i.hit(b);
       deadvaders.add(i);
       killb = true;
       
    }
  }  
    if(b.move()) killb = true;
    

    b.draw(); 
    if(killb) bi.remove();
  }

  Iterator di = deadvaders.iterator();
  while(di.hasNext()){
     Invader d = (Invader)di.next();
     if(d.fall()) di.remove(); 
     d.draw();
  }

}

void mouseMoved(){
  Iterator it = invaders.iterator();
  while(it.hasNext()){
    Invader i = (Invader)it.next();
    i.tx = mouseX;
    i.ty = mouseY;
  }  
  framesTilFree = 0;
}




class Bullet{
  float x,y;
  float SIZE = width/25;
  float SPEED = width/50;
   Bullet() {
      x = mouseX; 
      y = height + SIZE;
   }
   boolean  move(){
     y -= SPEED;
     if(y < -SIZE*2){
        return true; 
     }
     return false;
   }
   void draw(){
       fill(random(255));
pushMatrix();
translate(x,y);
       rect(-SIZE/4,-SIZE/4,SIZE/2,SIZE/2);
       popMatrix();
   }
}


class Invader{
  float x,y;
  float angle;
  float SIZE = 20;
  float tx,ty;
  float SPEED = 2;
  float TURNSPEED = .1; 
  float startx,starty;
  float xs,ys;
  
  color c = color(0,250,0);
  Invader(float x,float y, color c, float SIZE,float SPEED,float TURNSPEED){
    this.x = x;
    this.y = y; 
    this.tx = x;
    this.ty = y;
    this.c = c;
    this.SIZE = SIZE;
    this.SPEED = SPEED;
    this.TURNSPEED = TURNSPEED;
    this.startx = x;
    this.starty = y;
  }
boolean dead = false;
boolean fall(){
  ys += .1;
  y += ys;
  x += xs;
  if(y > height + SIZE){
     return true; 
  }
  return false;
}


void hit(Bullet b){
   xs = SPEED*cos(angle) ; 
   ys =    sin(angle)  - 1;
   dead = true;
}

  void draw(){
    noStroke();
    if(dead) fill (100); else   fill(c);
    pushMatrix();
    translate(x,y);

    rotate(angle);
    //    rotate(PI);

    //rotate(PI/2);
    rect(-SIZE/2,-SIZE/2,SIZE,SIZE);
    //fill(0,0,255);




    pushMatrix();
    rotate(-PI/4);
    translate(0,SIZE/4);
    rect(-SIZE/8,-SIZE/4,SIZE/4,SIZE);
    popMatrix();

    pushMatrix();
    rotate(-PI*3/4);
    translate(0,SIZE/4);
    rect(-SIZE/8,-SIZE/4,SIZE/4,SIZE);
    popMatrix();



//eyes
if(! dead){
    fill(0);
    pushMatrix();
    translate(-SIZE/8,-SIZE/4);
    rect(-SIZE/8,-SIZE/8,SIZE/4,SIZE/4);
    popMatrix();

    pushMatrix();
    translate(-SIZE/8,SIZE/4);
    rect(-SIZE/8,-SIZE/8,SIZE/4,SIZE/4);
    popMatrix();
} else {
  
    fill(0);
    stroke(0);
    strokeWeight(2);
    pushMatrix();
    translate(-SIZE/8,-SIZE/4);
    line(-SIZE/6,-SIZE/6,SIZE/6,SIZE/6);
    line(-SIZE/6,SIZE/6,SIZE/6,-SIZE/6);
    popMatrix();

    pushMatrix();
    translate(-SIZE/8,SIZE/4);
    line(-SIZE/6,-SIZE/6,SIZE/6,SIZE/6);
    line(-SIZE/6,SIZE/6,SIZE/6,-SIZE/6);
    popMatrix();  
  
  
}

    popMatrix();
  }

//float anglespeed = 0;

  void move(){
    if( framesTilFree > RESET_TIME){
       tx = startx;
      ty = starty; 
    }

    float dx = (tx -x);
    float dy = ( ty - y);
    float wantangle = atan2(dy, dx);
    float anglediff = (angle - wantangle);  

    anglediff /= PI;
    //this next bit catches the "runaround"
    
    
    if(anglediff > 1){
      anglediff -= 2;
    }
    if(anglediff < -1){
      anglediff += 2;
    }


    if(anglediff > 0){
      //  println(" <-\\");
      angle -= TURNSPEED; 
    } 
    else {
      //  println(" /->");

      angle += TURNSPEED; 
    }

   
   
float           angcos= cos(angle);
float    angsin = sin(angle);
        
    x +=  angcos* SPEED; 
    y += angsin * SPEED; 
 

  }
    
    
  
}