Hello Fabio, I would do this "manually" by storing two images. One is shown, and that is the one that is being clicked on. The second image is a "label Image" that maps the pixels to a 24-bit number (8 bits for each color). For each pixel in the show image you have the corresponding label in the label image. The labels of the label image are then used to lookup further information that you want to store for each of your points, e.g. whether it is selected, values, etc. You construct the show image and the label image in parallell. The show image with the color you want to display, and the label image with the label index. This works fine - as long as you make sure that you don't use any aliasing when you paint your label image. Of course this is not what you asked for... Regards, Dov On 9/28/06, Fabio Mariotti <Fabio.Mariotti@xxxxxxxxxxxxxxxxxxxx> wrote: > > Hi All, > > I am a real newby on GTK. And also new to GUIs and X. > > Nevertheless I try to do my best.. > > I do have an application which needs to draw about 30000 > clickable points on screen. > > I need stuff like: > 'on-mouse-over' show values > 'on-buttom-down' select/unselect/assign to > > I have implemented an application which works nicely with > 2000 points using the GnomeCanvas Widget (on my old 512Mb notebook). > > The X server needs much more memory. > > I can step back to a drawable and handle events and image superposition > in an old style. > > But because the GnomeCanvas is a nice usefull tool: Can I move and/or > control hoe much work is given to the X server? > > Or.. can I make the GnomeCanvas a simple drawable for the X server? > And handle the graphycal representstion on my X client? (Ordering,and > events) > > cheers > Fabio > > > _______________________________________________ > gtk-list mailing list > gtk-list@xxxxxxxxx > http://mail.gnome.org/mailman/listinfo/gtk-list > _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
