Re: Creating an ROI (Region of Interest)


If you want something like persistent graphic object (as opposed to mere drawing
functions of Gdk), you should look at GnomeCanvas. Plus it can deal with things
like pointer and focus grabbing etc.

Havoc's book (GTK+/Gnome Application Development, ISBN: 0735700788) has quite good
description of canvas.

Best wishes,
Lauris Kaplinski

On 14 Mar 2001 20:49:07 -0800, Jerry Mulchin wrote:
> I'm looking for a way to create a Region of Interest in an image. I want to be able create
> a rectangle that I can change the shape as I drag the mouse, and I want to be able to 
> place the ROI anywhere in the image. I would like the lines generated for the rectangle
> to be dashed or translucent, not solid lines if at all possible as it becomes a distraction.
> I also need to have the dimensions of the rectangle returned so that the area of the ROI 
> can be used to mark the processing area.
> I've looked at all the Gtk+ stuff for creating rectangles and they all require predefined X/Y
> values to create the box. I need the box to be enlarged or shrunk by using the mouse
> directly. It can start out as a small rectangle, but it has to be changable by using the
> mouse.
> Can anyone help me with code or URL locations that explain how to do this using Gtk+.
> Thanks in Advance
> Jerry Mulchin    Amateur Radio Call  -  N7EME
> Programmer, Amateur Astronomer, Ham Radio
> e-mail (home) - jmulchin astroguy com
> e-mail (work) - jmulchin cisco com
> Astronomy Web Page
> "It is never wrong to ask a question, it is always wrong to be ignorant."
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> gnome-devel-list gnome org

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