Re: Colors and GDK, this the best way?

[Eric Harlow <linuxgeek yahoo com>]

Situation:

I have a drawing area (drawing_area) that I'm trying to create
colorful drawings in.  I want to create a few gc's using different
colors so I don't have to recreate them over and over again as I need
them.

In doing so, I create a "GetPen" routine that I pass the color
information and get a gc.  It's currently called from the
configure_event so I assume that my drawing area is almost ready for
drawing.  I do no drawing in the configure event though.  My existing
routine works - the new one fails.  I like the new one because it's
shorter.  I'm using 1.0.4 GTK.

I'm new to GDK and would appreciate some enlightment on my mistakes. 
(Get out the spotlight. <g>)
 
My current routine to get a color gc is as follows:

GdkGC *GetPen (int nRed, int nGreen, int nBlue)
{
    GtkStyle *style;
    GdkGCValuesMask gc_values_mask;
    GdkGCValues gc_values;
    GdkGC *gc;

    style = drawing_area->style;

    gc_values_mask = GDK_GC_FOREGROUND | GDK_GC_FONT;

    gc_values.foreground.red = nRed;
    gc_values.foreground.blue = nGreen;
    gc_values.foreground.green = nBlue;

    gdk_color_alloc (style->colormap, &gc_values.foreground);

    gc = gtk_gc_get (style->depth,
                     style->colormap,
                     &gc_values,
                     gc_values_mask);

    return (gc);
}

Using the code that was sent to me I recreated the routine as:

GdkGC *GetPen (int nRed, int nGreen, int nBlue)
{
    GdkColor *c;
    GdkGC *gc;

    c = (GdkColor *) malloc (sizeof (GdkColor));
    c->red = nRed;
    c->green = nGreen;
    c->blue = nBlue;

    gdk_color_alloc (gdk_colormap_get_system (), c);

    gc = (GdkGC *) malloc (sizeof (GdkGC));

    gdk_gc_set_foreground (gc, c);

    return (gc);
}







---Havoc Pennington <rhpennin@midway.uchicago.edu> wrote:
>
> 
> On Sun, 20 Sep 1998, Eric Harlow wrote:
> > 
> > Didn't work.  Dies in XSetForeground.
> > 
> > called from gdk_gc_set_foreground. 
> > 
> 
> You're probably doing something else wrong. Maybe send along more
info.
> 
> Havoc
> 
> 
> -- 
> To unsubscribe: mail -s unsubscribe gtk-list-request@redhat.com <
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> 
> 

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