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ISO directdraw border question

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How can I draw a black border all around my map so I dont get
void draw_tiles(void)
    for(Tileset.y=0; Tileset.y <Mapy;Tileset.y++)
    {for(Tileset.x=0; Tileset.x < Mapx; Tileset.x++)
    {  //what does this do?
    Tileset.scroll_x = Tileset.x + (Tileset.world_camerax/Tileset.Tile_Width  );//this allows scrolling on y axis
    Tileset.scroll_y  =Tileset.y+ (Tileset.world_cameray/Tileset.Tile_Hight );//this allows scrolling on x axis
      Tileset.offset_x= Tileset.world_camerax+ (screenx/2);
           Tileset.tiles = map[Tileset.y ][Tileset.x ];       

    tile_src.left = ((Tileset.tiles - 1)%14) *Tileset.Tile_Width;
    tile_src.top =  ((Tileset.tiles - 1) /14) * Tileset.Tile_Hight ;
    tile_src.right = tile_src.left + Tileset.Tile_Width ;
    tile_src.bottom = tile_src.top + Tileset.Tile_Hight  ; 

dstr.left= ((Tileset.x-Tileset.y)*Tileset.Tile_Width/2)+Tileset.offset_x;//+(800/2);
dstr.top=  ((Tileset.y+Tileset.x)*Tileset.Tile_Hight/2)-Tileset.offset_y;//-(600/2);

dstr.right = dstr.left +Tileset.Tile_Width ;
dstr.bottom = dstr.top +(Tileset.Tile_Hight + Tileset.Tile_Width) ;

//bout<<dstr.left<<" "<<dstr.top<<endl;


[Edited by - kingpinzs on May 21, 2005 6:08:11 AM]

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