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2d direct draw map help rotating on y axis

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How can i roatae my map on its y axis so all the tiles line up. I need to ratat the y axis by 45 degrees or less. How is this done? thanks.
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_size);//this allows scrolling on y axis
      Tileset.scroll_y = Tileset.y+   (Tileset.world_cameray/Tileset.Tile_size);//this allows scrolling on x axis

      Tileset.offset_x = Tileset.world_camerax % Tileset.Tile_size;       
      Tileset.offset_y = Tileset.world_cameray % Tileset.Tile_size;   
          Tileset.tiles = map[Tileset.scroll_y][Tileset.scroll_x];

    tile_src.left = ((Tileset.tiles -1)%4) *Tileset.Tile_size;
    tile_src.top =  ((Tileset.tiles -1)/4) * Tileset.Tile_size;
    tile_src.right = tile_src.left + Tileset.Tile_size;
    tile_src.bottom = tile_src.top + Tileset.Tile_size; 

dstr.left=((Tileset.x-Tileset.y)*Tileset.Tile_size/2)/*- Tileset.offset_x */+(800/2);
dstr.right=dstr.left + Tileset.Tile_size;

dstr.top= ((Tileset.y+Tileset.x)*Tileset.Tile_size/2)/*- Tileset.offset_y*/-(600/2);
dstr.bottom=dstr.top + Tileset.Tile_size;

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

//the above is for debugging use



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