Writing Games with Processing: Winning

RunPlattyRun_V6

// Version 6: Winning the game

int px = 320, py = 240;
int tileSize = 20;

int signum(float value) {
  return value < 0 ? -1 : value > 0 ? 1 : 0;
}

class Enemy {
  color c;
  int x, y;
  String name;
  boolean fighting;
  
  Enemy(String name) {
    this.name = name;
    c = color(222,40,107);
  }
  
  void draw() {
    fill(c);
    ellipse(x + tileSize/2, y + tileSize/2, tileSize, tileSize);
    
    fill(0);
    textAlign(CENTER, TOP);
    textSize(12);
    text(name, x + tileSize/2, y + tileSize + 2);
  }
  
  void hunt() {
    int dx = signum(px - x) * tileSize;
    int dy = signum(py - y) * tileSize;
    
    x += dx;
    y += dy;
  }
  
  boolean closeTo(int tx, int ty) {
    int dx = abs(x - tx) / tileSize;
    int dy = abs(y - ty) / tileSize;
    println(name+" dx="+dx+" dy="+dy);
    return dx <= 1 && dy <= 1;
  }
}

ArrayList<Enemy> enemies = new ArrayList<Enemy>();
void addEnemy(int x, int y, String name) {
  Enemy enemy = new Enemy(name);
  enemy.x = x;
  enemy.y = y;
  enemies.add(enemy);
}

void drawEnemies() {
 for(Enemy e: enemies) {
    e.draw();
  }
}

void mousePressed() {  
  saveFrame("frame-######.png");
  println("Saved frame.");
}

void setup() {
  size(640, 480); //VGA for those old enough to remember
  
  addEnemy(20, 20, "Kenny");
  addEnemy(600, 20, "Benny");
}

void drawPlatty() {
  fill(235,220,160);
  rect(px, py, tileSize, tileSize);
  
  fill(0);
  textSize(tileSize-2);
  textAlign(CENTER, CENTER);
  text("P", px+tileSize/2, py+tileSize/2-2);
}

void drawBackground() {
  fill(174, 204, 27);
  rect(0, 0, width, height);
}

void draw() {
  drawBackground();
  drawPlatty();
  drawEnemies();
}

void moveEnemies() {
  for(Enemy e: enemies) {
    e.hunt();
  }
}

void checkCollisions() {
  ArrayList<Enemy> enemiesToCheck = new ArrayList<Enemy>();
  
  for(Enemy e: enemies) {
    if(e.closeTo(px, py)) {
      gameOver(e);
      return;
    }
    
    for(Enemy e2: enemiesToCheck) {
      if(e.closeTo(e2.x, e2.y)) {
        e.fighting = true;
        e2.fighting = true;
      }
    }
    
    enemiesToCheck.add(e);
  }
  
  int notFighting = 0;
  for(Enemy e: enemies) {
    if(!e.fighting) {
      notFighting ++;
    }
  }
  
  if(notFighting == 0) {
    youWon();
  }
}

void youWon() {
  draw();
  noLoop();
  
  textAlign(CENTER, TOP);
  textSize(40);
  color outline = color(255,255,255);
  color fill = color(255,0,0);
  textWithOutline("YOU WON!", width/2, 200, outline, fill);
  
  textSize(20);
  textWithOutline("The cute platypus outsmarted "+enemies.size()+" crocodiles!", width/2, 240, outline, fill);
}
  
void gameOver(Enemy e) {
  draw();
  noLoop();
  
  textAlign(CENTER, TOP);
  textSize(40);
  color outline = color(255,255,255);
  color fill = color(255,0,0);
  textWithOutline("GAME OVER", width/2, 200, outline, fill);
  
  textSize(20);
  textWithOutline("The poor platypus was eaten by "+e.name+"!", width/2, 240, outline, fill);
}

void textWithOutline(String message, int x, int y, color outline, color fill) {
  fill(outline);
  text(message, x-1, y);
  text(message, x+1, y);
  text(message, x, y-1);
  text(message, x, y+1);
  
  fill(fill);
  text(message, x, y);
}

void movePlayer(int dx, int dy) {
  dx *= tileSize;
  dy *= tileSize;
  
  int newX = px + dx;
  int newY = py + dy;
  if(newX >= 0
    && newX < width
    && newY >= 0
    && newY < height
  ) {
    px = newX;
    py = newY;
  }

  moveEnemies();
  checkCollisions();
}

void keyPressed() {
  if(key == CODED) {
    if(keyCode == UP) {
      movePlayer(0, -1);
    } else if(keyCode == DOWN) {
      movePlayer(0, 1);
    } else if(keyCode == LEFT) {
      movePlayer(-1, 0);
    } else if(keyCode == RIGHT) {
      movePlayer(1, 0);
    }
  } else if(key == ' ') {
    movePlayer(0, 0);
  }  
}