Re: Color question

[manu aradhya <manu_aradhya yahoo co in>]

u can change the color of the rectangle,just change
the color of gc  to ur desired color.this will work
for u.

GdkColor c;
        GdkGC *gc;
        c.red = 11001;
        c.blue = 60001;
        c.green = 14797;
        gdk_color_alloc (gdk_colormap_get_system (),
&c);
        gc = gdk_gc_new (widget->window);
        gdk_gc_set_foreground (gc, &c);

after whis pass this gc to desired function which is
drawing the rectangle.
or 
gdk_draw_rectangle (pixmap, gc, FALSE, 40,50,20,20);  
   

                                            -manu

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



 --- Peter Krueger <pkrueger appss de> wrote: > On
Wed, 31 Mar 2004, kadil wrote:
> > I have an appthat is reading data from an odbc
> database and drawing the
> > results on a drawing area. One line drawn per row
> returned. Table data as
> > follows:
> >
> > Start_of_line       End_Of_Line     Color
> > 0                   10                      565466
> > 10                  17                      99094
> > 17                  42                      255
> >
> > One of the columns returned is a color. So I want
> to draw the each rectangle
> > colored as per the record. When I try to change
> the color, it changes the
> > color of all the previous rectangles that I have
> drawn. Do I need to define a
> > separate color for each possible color option?
> Hi kadil,
> it's not clear to me how you draw your rectangles in
> detail. What you
> should do is:
> - invalidate your drawing area when your data
> changes, so that an
>   expose-event is generated
> (gtk_widget_queue_draw_area)
> - in the expose-event handler:
>   - set draw color
>   - draw a rectangle
>   - set next draw color
>   - draw next rectangle
>   and so on
>
> You should decide yourself whether you read data
> from the database every
> time an expose-event occurs or rather cache them in
> own data structures
> inside your program.
>
> Regards,
>                          Peter
> -- 
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