• fullscreen
  • gametutorial4.pde
  • int shipx;
    int shipy;
    
    int bulletx;
    int bullety;
    
    alien_class alien;
    
    class alien_class
    {
      int alienx;
      int alieny;
      int alienxv;
      int alienyv;
    
      alien_class()
      {
        alienx=50;
        alieny=50;
        alienxv=5;
        alienyv=1;
      }
    
      void alien_update()
      {
        move_alien();
        fill(0, 255, 0);
        rect(alienx, alieny, 10, 10);
      }
    
      void move_alien()
      {
        alienx+=alienxv;
        if (alienx>width) alienxv=-alienxv;
        if (alienx<0) alienxv=-alienxv;
    
        alieny+=alienyv;
        if (alieny>height) alienyv=-alienyv;
        if (alieny<0) alienyv=-alienyv;
      }
    }
    
    
    void setup()
    {
      size(400, 240);
      frameRate(30);
    
      alien = new alien_class();
    
      bulletx=-1; // if the bullets x coordinate is -1 we consider it not firing.
      shipx=width/2;
      shipy=height-20;
    
      fill(255);
      stroke(0);
    }
    
    void draw()
    {
      background(0);
    
      fill(0, 255, 0);
      fill(255);
      rect(shipx, shipy, 10, 10);
    
      if (bulletx>0)
      {
        fill(255, 0, 0);
        rect(bulletx, bullety, 4, 4);
        bullety-=5;
        if (bullety<0) bulletx=-1;
      }
    
      alien.alien_update();
      move_ship();
    }
    
    void move_ship()
    {
      if (mouseX>shipx) shipx+=5;
      if (mouseX<shipx) shipx-=5;
    }
    
    
    void mousePressed() {
      if (bulletx>=0) return; // do not fire if a bullet is already fired
      bulletx=shipx;
      bullety=shipy-5;
    }
    
    

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    about this sketch

    This sketch is running as Java applet, exported from Processing.

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    Shootem up game tutorial 4

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    Added alien class

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