DieHard Wolfers :: View topic - Translating moving objects code to 4SDL

Ok Ronwolf... Here you go... The nice text in the Blue is what you will be adding to the different files.

In the version.h file add the following:

::: CODE :::

#define PUSHOBJECT // Adds pushable sprite/static object code to the game

In wl_def.h

Make the static object structure look likke this:

::: CODE :::

//---------------------

//

// trivial actor structure

//

//---------------------

typedef struct statstruct

{

    byte      tilex,tiley;

    short     shapenum;           // if shapenum == -1 the obj has been removed

    byte      *visspot;

    uint32_t  flags;

    byte      itemnumber;

#ifdef PUSHOBJECT // Objects that can be pushed

    byte      pushable;

#endif    

} statobj_t;

#ifdef PUSHOBJECT // Objects that can be pushed

  // Place this value on the floor below an item that you want to be pushable

  #define PUSHITEMMARKER    145   // Add this value to your mapdata defines - change value if required

#endif

extern  void ResetFloorCode (int tilex,int tiley);   

// Arrays for quick checking locations on the map

extern  char            dx4dir[4];

extern  char            dy4dir[4];

In wl_game.cpp at the top of the file, add these lines to the Global Constants definitions:

::: CODE :::

// Arrays for quick checking cardinal direction locations on the map

char dx4dir[4]= { 0, 1, 0, -1 };  // dx & dy based on direction

char dy4dir[4]= {-1, 0, 1,  0 };

In the wl_agent.cpp file, down in the CMD_Use routine, add these lines before the last ending bracket of the routine:

::: CODE :::

// Static Object/Items manipulation routines

  for(statptr = statobjlist; statptr != laststatobj; statptr++)

  {

    if(statptr->tilex == checkx && statptr->tiley == checky && !buttonheld[bt_use])

    {

      buttonheld[bt_use] = true;        // that must react to spacebar

    #ifdef PUSHOBJECT // Pushable Items or Objects that can be pushed

      if (statptr->pushable) // Is the item Pushable

      {

        if (actorat[checkx][checky])

        {

          if(actorat[checkx + dx4dir[dir]][checky + dy4dir[dir]] > 0) { return; } // Is Tile to move to Free?

          SD_PlaySound (TAKEDAMAGESND);                                 // Make a Ugh pushing sound

          statptr->tilex = statptr->tilex + dx4dir[dir];                // Free to move object

          statptr->tiley = statptr->tiley + dy4dir[dir];                // to it's new location

          statptr->visspot = &spotvis[statptr->tilex][statptr->tiley];  // Make it visible

          actorat[checkx][checky] = (objtype *)(uintptr_t) 0;

          actorat[statptr->tilex][statptr->tiley] = (objtype *)(uintptr_t) 64;

        }

      }

    #endif

    // Other routines for static objects can be inserted here

    // End of static object check loop

    }

  }

And at the top of the routine, you will see the defines for checkx and so on... Make that section look like this:

::: CODE :::

    int     checkx,checky,doornum,dir;

    boolean elevatorok;

    statobj_t* statptr;

In the wl_act1.cpp file, add the following code above the SpawnStatic routine:

::: CODE :::

  /* ============ Reset Floor Code ================ */

  // Replace Any Map Modifier Code with a valid Floor Code Value

void ResetFloorCode (int tilex,int tiley)

{ 

  int x,y;

  for (x = di_north; x <= di_west; x++)

  {

    y = MAPSPOT (tilex+dx4dir[x], tiley+dy4dir[x], 0);

    if ( y >= AREATILE && y <= (AREATILE+NUMAREAS-1) )

      { MAPSPOT (tilex,tiley,0) = y; return; }

  }

}

In the SpawnStatic routine, add the following, to make the end of the routine look like this:

::: CODE :::

#ifdef PUSHOBJECT // Pushable Static Object Item

  if (MAPSPOT(tilex,tiley,0) == PUSHITEMMARKER)

  {

    laststatobj->pushable = 1;     // Make Item Pushable or True

    ResetFloorCode (tilex,tiley);  // Reset the Floor code to a valid Floor code value

  }

#endif

  laststatobj->flags |= statinfo[type].specialFlags;

  laststatobj++;

  if (laststatobj == &statobjlist[MAXSTATS]) Quit ("Too many static objects!\n");

And that should be it. Now you add the floor value of 145 to you mapedit defines... and put that tile down underneath the static objects that you want to be pushable on any of your maps. When the maps are loaded, as the static items are spawned, the ResetFloorCode will set the object as pushable and change the floor code back to a proper value of that of one of the squares immediately next to the spot where the pushable item is now marked. This code is taken directly from the Community Map of the Month contest code... I've just extracted it and coloured it nicely to make it easier to re-install. It worked perfectly in that source (SDL) so it shouldn't be a problem in the latest SDL source from Ripper [version 1.7 I believe].

Let me know if you have any problems...

Enjoy!

Greg
BrotherTank