[gtkmm] A better way to paint? (using draw_rectangle)

["Drinkin Park" <drink_n_park hotmail com>]

Hi all,

I am currently working on a tile-based map editor for a game, and I am using 
gtkmm to produce it.

This is the method that I am currently using to display the map in a 
Gtk::DrawingArea:

----------------------------------

...

//xMin, yMin = the top-left co-ordinates of the map to display in the 
DrawingArea.
//xMax, yMax = the bottom-right co-ordinates of map to display.
//map = a 2D array that holds the actual map.
//zoom = the zoom factor of the window.
//  zoom = 1: one pixel in image = one pixel on screen
//  zoom = 2: one pixel in image = two pixels on screen

 for (int i = xMin; i <= xMax; i++)
   for (int j = yMin; j <= yMax; j++)
     if (i >= 0 && i < MAP_XSIZE && j >= 0 && j < MAP_YSIZE)
     {
       if (map[i][j] != 0)
         get_window()->draw_rectangle(gc, true, mapToScreenX(i), 
mapToScreenY(j), zoom, zoom);
     }

...

----------------------------------

The problem I am having is, that when the zoom factor is low (and hence the 
draw_rectangle method is called many times) screen updates occur very 
slowly. Is there a faster method for drawing to the screen using gtkmm?

Thanks in advance.

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