Re: one more time about color (colour)

["Jonathon Jongsma" <jonathon jongsma gmail com>]

On 10/20/06, konrad kwaskiewicz <konrad kwaskiewicz gmail com> wrote:
> hi
> I need to get Color from selected point (x,y) on drawing area
> (not using ColorButton, just knowing [x,y])
> is there some function like drawingarea.getColor(int x,int y)
> or any other possibility to take color from one point?
> it would be grate if someone knows an example
> thanks

I've not personally done this, but the GTK+ colorselector widget has a
little "dropper" button that lets you click anywhere on the screen to
get the color at the point where you click.  So you might look at the
GTK+ source for inspiration and then convert that to gtkmm.  It
doesn't look like they use any internal API so it should be pretty
easy.  Look for the function "grab_color_at_mouse()" in the following
file: http://cvs.gnome.org/viewcvs/gtk%2B/gtk/gtkcolorsel.c?rev=1.150&view=markup

Hope that helps.

--
jonner