Hi, > I think my question is: > > If I have an image loaded into gimp, and displayed in a window, and my > plug-in fired up, how do I get the coordinates of the mouse when one of > the buttons is clicked into the plug-in? > > Here's what I want to do: > > I'm trying to write an "unplot" plugin. The idea is to load a graph > image into the gimp (probably using a scanner), and then, using the mouse > to click on points on the graph, write the x and y values of > mouse-selected points to a file. Thus, if I had a graph of, say, > voltage vs. current, I could digitize it manually using the plug-in, > obtaining a file with voltages and currents. > > In order to do this, the plug-in has to be able to get the mouse > coordinates when a button is clicked. I think I know how to do that in > a stand-alone gtk-based program, but I can't figure out how to do it > from a gimp plug-in. I guess the optimum coordinate system would be the > local coordinates within the image window, but global coordinates of the > underlying root window would probably be OK too. > > Advice would be much appreciated. I've looked in Kevin Turner's "Writing > a GIMP Plug-in" tutorial, and in all the FAQ's I can find. I've also > looked in the plug-in registry for an existing plug-in I could snarf. If > the solution was in any of these places, I was too dense to realize it. Well, the answer is that you can't! There is no way for a plug-in to notice what a user is doing in the image window. The only possibility you have is to ask gimp for a preview of the image using gimp_image_get_thumbnail() or the complete image data using gimp_pixel_rgn_init() and friends, then render that image into your own GtkDrawingArea or GtkPreview and connect to the events they emit. Salut, Sven
