import java.awt.*;

public class Minimal extends MISApplet{
  //variables for mouse
  int  mx = 0;
  
  final int WHITE = pack(255,255,255);
  final int BLACK = pack(  0,  0,  0);
  final int RED   = pack(255,  0,  0);
  final int BLUE   = pack(0,0,255);
  final int GREEN   = pack(0,255,  0);
  final int radius = 10;
  final int thickness = 5;
  double cur_time = 0;
  double ex=0,ey=0;//top left corner
  double p;
  //1000 and  .99996
  //500 and .99999
  double v;
  double a;
  double rate;
  boolean draw_bullet;
  boolean bullet_fired;
  double  bx;
  double by;
  double bv;
  enum State{START, WINNER, LOSER, PLAYING }
  State game_state;
  int background_color;
  int foreground_color;
  int enemy_color;
  
  

  public void initialize() {
    //set mouse to middle of the applet
    draw_bullet = false;
    bullet_fired =  false;
    game_state = State.START;
    background_color = WHITE;
    foreground_color = BLACK;
    enemy_color= foreground_color;
    p = 0;
    v = 1000;
    rate = 0.99997;
    a = 1.0;
  }
  

  /** Overriden method that must define frame in doube pix[] array */
  public void computeImage(double time) {
    //paint the backdrop
    for(int i=0;i<W*H;i++) pix[i] = background_color;
    if(game_state != State.START){
      double past_time = cur_time;
      cur_time = time; 
      double cur_step = Math.min(1,cur_time - past_time);
      if(bullet_fired &&
        Math.sqrt((bx-ex)*(bx-ex)+(by-ey)*(by-ey)) <= radius+radius/2
      ){
        game_state = State.WINNER;
        background_color = BLACK;
        foreground_color = WHITE;
        enemy_color = RED;
        draw_bullet  = false;
      }else{
        if(game_state == State.PLAYING){
          p = p+cur_step*v;
          int div = (int)(p/(W+radius*2));
          int mod = (int)(p%(W+radius*2));
          if(div%2==0){
            ex = Math.min(mod,W);
          }else{
            ex = W-Math.min(mod,W);
          }
          ey = div*radius*2+(mod>W ? mod%W : 0);
          a = a*rate;
          v = v*a;
          if(bullet_fired){
            if(by<0-radius/2){
              game_state = State.LOSER;
              background_color = BLACK;
              foreground_color = WHITE;
              enemy_color = foreground_color;
            }
            else{
              by = by-cur_step*bv;
            }
          }
        }

      }
      // draw bullet
      if(draw_bullet){
        for(int i =0;i<radius/2;i++)
        for(int j =0;j<radius/2;j++){
          if(i*i+j*j<radius*radius/4){
          if(bx+i<W && by+j<H && bx+i>0 && by+j>0)
            pix[xy2i((int)bx+i,(int)by+j)] = foreground_color;
          if(bx+i<W && by-j<H && bx+i>0 && by-j>0)
            pix[xy2i((int)bx+i,(int)by-j)] = foreground_color;;
          if(bx-i<W && by-j<H && bx-i>0 && by-j>0)
            pix[xy2i((int)bx-i,(int)by-j)] = foreground_color;;
          if(bx-i<W && by+j<H && bx-i>0 && by+j>0)
            pix[xy2i((int)bx-i,(int)by+j)] = foreground_color;;
          }
        }
      }
      // draw enemy
      for(int i =0;i<radius;i++)
      for(int j =0;j<radius;j++){
        if(i*i+j*j<=radius*radius && i*i+j*j>=thickness*thickness){
          if(ex+i<W && ey+j<H && ex+i>0 && ey+j>0)
            pix[xy2i((int)ex+i,(int)ey+j)] = enemy_color;
          if(ex+i<W && ey-j<H && ex+i>0 && ey-j>0)
            pix[xy2i((int)ex+i,(int)ey-j)] = enemy_color;
          if(ex-i<W && ey-j<H && ex-i>0 && ey-j>0)
            pix[xy2i((int)ex-i,(int)ey-j)] = enemy_color;
          if(ex-i<W && ey+j<H && ex-i>0 && ey+j>0)
            pix[xy2i((int)ex-i,(int)ey+j)] = enemy_color;
        }
      }
      // draw user
      for(int i =0;i<radius;i++)
      for(int j =0;j<radius;j++){
        if(i*i+j*j<=radius*radius && i*i+j*j>=thickness*thickness){
          if(mx+i<W && (H-radius)+j<H && mx+i>0 && (H-radius)+j>0)
            pix[xy2i((int)mx+i,(int)(H-radius)+j)] = foreground_color;
          if(mx+i<W && (H-radius)-j<H && mx+i>0 && (H-radius)-j>0)
            pix[xy2i((int)mx+i,(int)(H-radius)-j)] = foreground_color;
          if(mx-i<W && (H-radius)-j<H && mx-i>0 && (H-radius)-j>0)
            pix[xy2i((int)mx-i,(int)(H-radius)-j)] = foreground_color;
          if(mx-i<W && (H-radius)+j<H && mx-i>0 && (H-radius)+j>0)
            pix[xy2i((int)mx-i,(int)(H-radius)+j)] = foreground_color;
        }
      }
    }
  }
  
   public boolean mouseUp(Event e, int x, int y) {
    switch(game_state){
      case PLAYING:
      if(!bullet_fired){
        bullet_fired = true;
        bv = 1000;//lock in velocity = to the enemy plus 1
        bx = x;
        by = H-radius*2-radius/2;
        return true;
      }else{
        return false;
      }
      default: 
        initialize();
        game_state = State.PLAYING; return true;
    }
   }

   public boolean mouseDown(Event e, int x, int y) {
    switch(game_state){
      case PLAYING:
       if(!bullet_fired){
         draw_bullet = true;
         bx = x;
         by = H-radius*2-radius/2;
         return true;
       }
    }
    return false;
   }

   public boolean mouseDrag(Event e, int x, int y) {
     if(!bullet_fired){
       bx = x;
     }
     mx = x;
     return true;
   }
   public boolean mouseMove(Event e, int x, int y) {
      mx = x;
      return true;
   }

   int ilerp(int t, int a, int b) { return a + (t * (b - a) >> 8); }
}