[gtkmm] Gdk::Colormap and Gdk::Color

["Michael A. Koziarski" <michael koziarski com>]

Hey guys,  I've been asking on IRC for a while, but as I'm ~12hrs from 
everyone else I should probably use the list.

The application I'm writing needs to do a fair amount of drawing onto 
pixmaps etc. so I've been tinkering with Gdk::Drawables lately and I'm 
wondering whether I've understood the Gdk::Color situation wrt 
Gdk::Colormaps.  Please point out any errors in the following:

In order to draw a line in a specified color, say red, I need to.

{
Glib::RefPtr<Gdk::Pixmap> pm = Gdk::Pixmap::create(x,y,d);
Glib::RefPrt<Gdk::GC> gc = Gdk::GC::create(gc);
Glib::RefPtr<Gdk::Colormap> cm = gc->get_colorap()
Gdk::Color red("red");

cm->alloc_color(red);
pm->draw_line(gc, 0, 0, 100, 100);
}

Do I need to manually allocate colors everytime?  or is there some funky 
Helper that'll hide all that stuff?

After I've alloced that color, can I pass it by value?  or is there some 
hidden magic happening?  i.e say I wanted to store allocated colors in a 
std::map<LColor::color, Gdk::Color> to simplify the process of 
translating draw instructions from the core code's own Colors to 
Gdk::Colors, no problems?

gtkmm-2.0 is feeling better with every widget I use.



Ta

Koz