Re: How to change colors on a drawing area?

["tony K." <tony kwok 3web net>]

At 12:10 23-02-01 +0100, you wrote:
> How to write a blue line and then a red line using gtk_draw_line?
>
> Thanks
>
> Luciano

By drawing with an appropirately set graphical context. 
I include here a few sample lines; THIS IS NOT a
complete code sequence, just a sample "invetory" of 
calls, but it should be all you need:

  gc = gdk_gc_new(mydraw->window);

...
   colormap = gdk_colormap_get_system();
   myColor.red = SOME_COL_R;
   myColor.green = SOME_COL_G;
   myColor.blue = SOME_COL_B;
   gdk_color_alloc(colormap, &myColor);
...
  gdk_draw_line(mydraw, gc, x1, y1, x2, y1);

  ...
   gdk_gc_unref(gc);

cheers, TK