Getting mouse coordinates from inside a gimp plug-in?
Hi, I'm a novice at working with the gimp, and I'm trying to write a plug-in. I've run into an unexpected snag, and I would very much appreciate a little help. I'll start with what I think my question is, and then afterwards, briefly describe what I want to do in case that really isn't my question :-). 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. Thanks. Frazer Williams [EMAIL PROTECTED] Department of Electrical Engineering University of Nebraska-Lincoln Lincoln, NE 68588-0511
Re: Getting mouse coordinates from inside a gimp plug-in?
On Tue, 27 Jun 2000, Frazer Williams wrote: 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? thats a gtk question, which is nicely answered at http://www.gtk.org look at the gtk tutorial (which can be downloaded). then look at events. 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. you could "detect" the plots automatically and with a little logic in your code, get an approximate of the plots. maybe even something as simple as a threshold then average those remaining values. this could be pretty elaborate and thus possible end up taking more of your time than the plug in you want to write would save you (but could be fun) 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. most gimp plug ins are gtk programs. they just happend to be called from the gimp and share some resourcces (i have written a gimp plug in with glut, and it worked, but gtk is usually easier) the same method should work.
Re: XCF code in Imlib2
[EMAIL PROTECTED] spontaneously blurts out: On 25 Jun, Marc Lehmann wrote: He and Raster are going to meet next week and then they'll think about possible solutions for this conflict. Don't they think this is demanding some _action_ (like reverting that patch)? "meet next week" and "possible solutions" sounds, well, not very serious. The patch IS already reverted. About 5 minutes after my mail... I talked to Raster right after the first email arrived and he said he would take care of it. I was hoping to give him a running start before the ugly free software posse jumped him. I must say that this mailing list has degenerated into something akin to a Microsoft legal newsgroup. Shoot first, let god sort'em out. What happened was wrong, yes, but the ugly mob bristling with legal talent doesn't seem too terribly community-like. Raster has provided more than his share free software and is probably amongst the top ten people for amount of code stolen from him, so a little 'slack' is appropriate. Especially considering that he didn't even do it in the first place. I could care less what you think of him or his code, but the ugly mob crap is tiresome and downright juvenile. I now await the mob turning on me. -Dean Johnson Tool Hooligan Cluster Admin Tools Jessie Project Silicon Graphics Inc.Eagan,MN (651) 683-5880 "I am Dyslexic of Borg, Your Ass will be Laminated"-- unknown
Re: Getting mouse coordinates from inside a gimp plug-in?
At 10:41 27/6/00 -0500, Frazer Williams [EMAIL PROTECTED] wrote: Hi, 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. An alternative hacky way to achieve the same results might be just add (draw) a dot of a well-known colour that does not otherwise appear in the image at each desired location, then post-process the image to extract the data by searching for those dots... Ian
Re: Getting mouse coordinates from inside a gimp plug-in?
At 10:41 27/6/00 -0500, Frazer Williams [EMAIL PROTECTED] wrote: 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. I would suggest you look at the code for the ImageMap plugin. Thinking about what it how it works from the users point of view I suspect it has to have a way of getting the mouse coordinates.
Re: Getting mouse coordinates from inside a gimp plug-in?
Or, you could blur the image a little, then use the Level curves to make the data a thin black line by squeezing the fully-black and fully-white arrow tags close together. Make the image indexed with one color. Finally, save the image as a .pgm or .xpm file. (.pbm is probably ideal but it seems like GIMP can't save in that format. Perhaps use ImageMagik's convert to go from pgm to pbm?) The data format for such files is very simple and with a quick read of the relevant man page, you will be all set to read the file, dump the data into an array and then off you go. If you have lots of pictures and would like to automate the process, you could even write a script to handle the GIMP part non-interactively. This has the advantage of probably being more accurate than using the mouse for coordinates, but perhaps this is not what you wanted. If that's the case, sorry... Alan
Installing gimp-1.1.24 (Gimp-perl) Problems
I have spent two days (ok well nights really) trying to get the gimp-1.1.24 source to compile correctly. Everything appears to work except for the Gimp-perl stuff. System Info --- Linux version 2.2.15-4mdk ([EMAIL PROTECTED]) (gcc version 2.95.3 19991030 (prerelease)) #1 Wed May 10 15:31:30 CEST 2000 Detected 350804278 Hz processor. Console: colour VGA+ 80x25 Calibrating delay loop... 699.60 BogoMIPS Memory: 257544k/262144k available (1208k kernel code, 416k reserved, 2904k data, 72k init, 0k bigmem) Perl 5.6 (i have also tried with perl5.004_05) here is the output from gimp-perl's make test snip-- make[1]: Entering directory `/home/jsheffie/build/gimp/gimp-1.1.24/plug-ins/perl/po' make[1]: Leaving directory `/home/jsheffie/build/gimp/gimp-1.1.24/plug-ins/perl/po' PERL_DL_NONLAZY=1 /usr/bin/perl -Iblib/arch -Iblib/lib -I/usr/lib/perl5/5.6.0/i386-linux -I/usr/lib/perl5/5.6.0 -e 'use Test::Harness qw(runtests $verbose); $verbose=0; runtests @ARGV;' t/*.t t/loadlib...Can't load 'blib/arch/auto/Gimp/Lib/Lib.so' for module Gimp::Lib: blib/arch/auto/Gimp/Lib/Lib.so: undefined symbol: gimp_micro_version at /usr/lib/perl5/5.6.0/i386-linux/DynaLoader.pm line 200. at blib/lib/Gimp/Lib.pm line 16 BEGIN failed--compilation aborted at blib/lib/Gimp/Lib.pm line 16. Compilation failed in require. require Gimp.pm called at t/loadlib.t line 7 main::BEGIN() called at blib/lib/Gimp.pm line 0 require 0 called at blib/lib/Gimp.pm line 0 Compilation failed in require at /usr/lib/perl5/5.6.0/Carp.pm line 119. BEGIN failed--compilation aborted at t/loadlib.t line 7. t/loadlib...dubious Test returned status 255 (wstat 65280, 0xff00) Undefined subroutine Test::Harness::WCOREDUMP called at /usr/lib/perl5/5.6.0/Test/Harness.pm line 334. make: *** [test_dynamic] Error 255 [root@kelly perl]# pwd /home/jsheffie/build/gimp/gimp-1.1.24/plug-ins/perl --- Thanks, Jeff -- | Do not try to cut your own hair. | | -- Forrest Gump | | -- Winston Groom | -- | Jeff Sheffield | | [EMAIL PROTECTED] | | - http://buzzard.kdi.com/jeff/family/ | | - http://www.team-linux.com/ | --
