Re: Rubber-band selection effect

[Fabien Bouleau <bouleau alsace u-strasbg fr>]

Hi, 

You just have to copy the pixmap on mouse click signal and each time
"motion-notify-event" is called, you redraw the original pixmap and then
the rectangle (gdk_draw_rectangle()). Take care of hint flag for
motion-notify-event (have a look in gtk+ online doc)...

Sincerly,
FB

Joe Piskor a écrit :
> 
> Hi all -
>         I would like to identify a rectangular area on a GTkPixmap that I am
> displaying in a viewport. I'd like to drag a rectangle over the pixmap and
> retrieve the coordinates (offsets) of the box corners. I can get them with
> single mouse clicks within the viewport area (defining top-left and
> bottom-right) but I'd really prefer the visual feedback. Soething like the
> Gimp's marching ants would be exceptional, but for now a simple rubber-band
> rectangle would be sufficient.
>         I'd appreciate any pointers to shove me in the right direction; I've pored
> over my FM's to no avail. Any help is appreciated.
> 
> Thanks...
> 
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