RE: 100 Different Colors

[Lola Smith <lola_smith55 yahoo com>]

> Before your call to gdk_set_rgb_fg_color, do a
> g_print on the values of
> c.red, c.blue, c.green, and i.  You may be surprised
> at what you see.

You're right. They're all the same thoughout the loop.
red = 65535, blue = 0, green = 0, except at the very
end green = 65535 (hence the yellow color). I figured
this is because they are integers, not doubles. 
 
So, how is it possible to change the colors inside the
loop?

Sorry, I'm pretty clueless right now... :-(
Any help is appreciated!



> > -----Original Message-----
> > From: gtk-app-devel-list-bounces gnome org
> [mailto:gtk-app-devel-list-
> > bounces gnome org] On Behalf Of Lola Smith
> > Sent: Tuesday, June 21, 2005 11:10 AM
> > To: gtk-app-devel-list gnome org
> > Subject: Re: 100 Different Colors
> >
> > Jan-Marek, thanks for your response.
> >
> > I tried this:
> >
> > > for (i=0; i<100; i++) {
> > >   c.pixel = 0;
> > >   c.red   = G_MAXUINT16;
> > >   c.blue  = (i % 33 / 99) * G_MAXUINT16;
> > >   c.green = i/99 * G_MAXUINT16;
> > >   gdk_gc_set_rgb_fg_color( gc, &c );
> > >   gdk_draw_rectangle (widget->window, gc, TRUE,
> > i*15,
> > >     0, 11, 11);
> > > }
> >
> > But all the squares are red now, with the
> exception of
> > the last one (100th), which is yellow.
> > Do I have to change the value of c.red inside the
> for
> > loop as well? Maybe something related to i?
> >
> > Btw, I am using gtk version 2.2, which didn't have
> > G_MAXUINT16, so I defined it like:
> >
> > #define G_MAXUINT16 ((guint16) 0xffff)
> >
> > Can someone help? Thaaank you!
> >
> >
> > --- Jan-Marek Glogowski <glogow fbihome de> wrote:
> >
> > > Hi
> > >
> > > > I need to create 100 little squares and each
> of
> > > them
> > > > has to be a different color. They can't just
> be a
> > > > random color: they have to follow the colors
> of
> > > the
> > > > standard color spectrum/palette. For example,
> the
> > > > first one is dark blue, then lighter blue, ...
> ,
> > > > green, ... , red.
> > >
> > > Std. color spectrum? Maybe like the circle in
> the
> > > GtkColorSelectionDialog?
> > >
> > > Algo:
> > > r = max, g = 0, b = 0
> > > r = max , g = max, b = 0
> > > r = 0, g = max, b = 0
> > > r = 0, g = max, b = max
> > > r = 0, g = 0, b = max
> > > r = max, g = 0, b = max
> > > back to step 1
> > >
> > > See GtkColorSelection source
> > >
> > > From the GDK Manual:
> > >
> > > gdk_gc_set_rgb_fg_color () - set the foreground
> > > color of a GC using an
> > > unallocated color.
> > >
> > > GdkColor - red, green, blue ... is a value
> between 0
> > > and 65535, with 65535
> > > indicating full intensitiy.
> > >
> > > GdkGC *gc;
> > > GdkColor c;
> > >
> > > gc = gdk_gc_new (widget->window);
> > >
> > > for (i=0; i<100; i++) {
> > >   c.pixel = 0;
> > >   c.red   = G_MAXUINT16;
> > >   c.blue  = (i % 33 / 99) * G_MAXUINT16;
> > >   c.green = i/99 * G_MAXUINT16;
> > >   gdk_gc_set_rgb_fg_color( gc, &c );
> > >   gdk_draw_rectangle (widget->window, gc, TRUE,
> > > i*15,
> > >     0, 11, 11);
> > > }
> > >
> > > HTH
> > >
> > > Jan-Marek
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