Octave-GTK 24/02/05 © Octave-GTK Team 24/02/05 Octave-GTK Team Octave-GTK, a language bindings project Hemant Muthu Rams Manik {gnufied, gnumuthu, Step in

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project ➔ Aims ➔ Rationale/Need ➔ Project Overview ➔ Development Tools ➔ Octave-GTK Today ➔ Octave-GTK demo ➔ What can you do? ➔ More Information Agenda

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Aims ➢ Integrate Scientific programming environment with a world-class GUI. ➢ Octave+GTK = Octave-GTK ➢ Octave bindings for GTK+ ➢ Octave GUI

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Terms ➢ Scientific Computing ➢ Octave ➢ GTK ➢ GUI ➢ Language Bindings ➢ Language Interoperability ➢ Advantages

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Rationale/Need ➢ A Software EcoSystem based around Octave. ➔ Integration of free tools & libraries Enviroments: Lush, SciLab, NumPython Libraries: GD, GTK, Fann, ImageMagick, Audiofile ➔ Octave-GUI Octave-GUI using Octave-GTK itself. ➔ Make porting easier Octave-SWIG: for autogenerating bindings. ➢ Principle of least surprise ➔ A Matlab clone. ➢ RAD for scientific Applications ➔ Stop Re-Inventing the wheel. ➔ Reduce Reuse Recycle. GNU Way. Why start Octave-GTK ?

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Project Overview ➢ Octave-GTK: ➔ Octave bindings to GTK ✔ GTK function calls from Octave. ✔ Function call marshalling ✔ Type conversion between Octave & C ➔ Octave bindings to LibGlade, LibGnomeUi, GDK ✔ Language bindings to LibGlade, for easier GUI programming ✔ LibGnome for real GNOME programs ✔ LibGDK for graphics & color. LibGD already ported. ✔ Octave-SWIG: for autogenerating bindings. ➢ Octave-GUI ➔ Octave-GUI using Octave-GTK itself. ➢ #1 Fun project! ➔ All code under this project is GPL'ed

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project ➢ Octave Bindings produced by Octave-GTK team. ➔ Octave-GTK Octave bindings to GTK. Write GUI code from Octave. ➔ Octave-libGlade Use Glade UI designer.glade files ➔ GD-Octave Image processing from Octave. ➔ Octave-Glade Glade UI Editor customised. ➢ Octave Bindings due from Octave-GTK team ➔ LibGnome for real GNOME programs ➔ LibGDK for graphics & color. LibGD already ported. ➔ LibAtk, LibPango, LibGlib, LibGObject Completes the GTK bindings set. Development Tools

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Octave-GTK Today ➔ Octave-GTK works today. ➔ Maps about 2083 functions automagically. ➔ Python code generator ➔ Custom lexer. ➔ Bindings autogenerated. ➔ Exports C API directly. ➔ Part of functions manually wrapped. ➔ Glue code of 35,208 lines of code. ➔ gtk.cpp size 1336Kb. ➔ Binding library, gtk.oct 5572 Kb

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Design Issues ➢ Callbacks are AdHoc ➢ Must Write a custom Marshaller. ➢ Type Mapping ➢ Integer to Pointer ➢ Memory Management ➢ Reference counting problem ➢ Quality of binding,GObject. ➢ Native to C, and Octave. ➢ Lag between releases. ➢ C API always newer. ➢ Library Size, Speed ➢ Octave marshalling slow

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Components ➢ Octave-GTK (40%) ➔ Difficult to write GUI's. ➔ Repetitive code ➔ Suitable for autogeneration ➔ Tough API to learn. ➔ Version 0.1 ➔ 2083 functions. ➢ Octave-LibGlade (80%) ➔ Easy to write GUI's. ➔ Only Event Handlers ➔ GUI Builder ➔ Easy simple API to learn. ➔ Version 0.1 ➔ 13 functions ➢ Gd-Octave (80%) ➔ Read/Write Image files. ➔ Easy Image Processing. ➔ Convolution, FFT, DFT ➔ Filtering, Analysis/Synthesis ➔ Fairly mature. ➔ Concise API to learn. ➔ Version 0.5 ➔ 75 functions ➢ Octave-Glade (5%) ➔ Glade Hacked ➔ History added? ➔ Customised Window creation ➔ Eliminate Boxed widget building. ➔ Auto-Code generation of octave. ➔ Version 0.1

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Demo ➢ Gd-Octave (80%) ➔ Read/Write Image files. ➔ Easy Image Processing. ➔ Convolution, FFT, DFT ➔ Filtering, Analysis/Synthesis ➔ Fairly mature. ➔ Concise API to learn. ➔ Version 0.5 ➔ 75 functions #! /usr/bin/octave -q function main() gd() fp=fopen("mail.png","wb") ip=gdImageCreate(200,40); color=gdImageColorAllocate( ip,0xcc,0xdd,0xff) %draws a square grid for i=0:20:190 gdImageLine(ip,0,i/5,200,i/5,color); gdImageLine(ip,i,0,i,40,color); end gdImageString(ip,"Large",0,20, "gd- gdImagePng(ip,fp); fclose(fp); gdFree(ip); end main()

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Demo ➢ Octave-GTK (40%) ➔ Difficult to write GUI's. ➔ Repetitive code ➔ Suitable for autogeneration ➔ Tough API to learn. ➔ Version 0.1 ➔ 2083 functions. #! /usr/bin/octave -q function main() gtk() %load library gtk_init() %initation w=gtk_window_new(0) b=gtk_vbox_new(0,0) gtk_window_set_title(w, "Welcome to Octave-GTK"); entry=gtk_entry_new(); gtk_entry_set_text(entry,"Hello World"); okb=gtk_button_new_with_label("ok"); gtk_container_add(w,b); gtk_container_add(b,entry); gtk_container_add(b,okb); %hookup the signals g_signal_connect(okb, "clicked","gtk_main_quit"); g_signal_connect(w, "destroy","gtk_main_quit"); gtk_widget_show_all(w); gtk_main() %enter main loop end main()

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Demo [LibGlade] ➢ Octave-LibGlade (80%) ➔ Easy to write GUI's. ➔ Only Event Handlers ➔ GUI Builder ➔ Easy simple API to learn. ➔ Version 0.1 ➔ 13 functions function main() global xml gtk() %Load GTK Library glade() %Load LibGlade gtk_init() %Initialize GTK Type system. xml=glade_xml_new("ohms.glade","window1",""); win1=glade_xml_get_widget(xml,"window1"); glade_xml_signal_autoconnect(xml); gtk_widget_show_all(win1); gtk_main() end main()

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Demo [LibGlade...] ➢ Octave-LibGlade (80%) ➔ Easy to write GUI's. ➔ Only Event Handlers ➔ GUI Builder ➔ Easy simple API to learn. ➔ Version 0.1 ➔ 13 functions #! /usr/bin/octave -q xml="" disp('Ohms law example with octave-libglade') function calculate_cb() global xml disp('Hello World') i=glade_xml_get_widget(xml,"current") r=glade_xml_get_widget(xml,"resistance") v=glade_xml_get_widget(xml,"voltage") amp=str2num(gtk_entry_get_text(i)) ohm=str2num(gtk_entry_get_text(r)) gtk_entry_set_text(v,num2str(amp*ohm)) end

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Demo [Complete App] ➢ Design the GUI with Octave-Glade ➢ Glade hacked & customised. ➢ Use the.glade file in your octave program. ➢ Standard LibGlade useage. ➢ Generate GUI from this using Octave-LibGlade ➢ Standard LibGlade useage. ➢ Write callbacks in Octave. ➢ Your Job! Application Logic ➢ Most of this stuff can easily be automated. ➢ Done in Octave-Glade. ➢ Octave-Glade (5%) ➔ Glade Hacked ➔ History added? ➔ Customised Window creation ➔ Eliminate Boxed widget building. ➔ Auto-Code generation of octave. ➔ Version 0.1

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project Time Line 20 July 2004 Project Launched 29 July 2004 First Octave-GTK Prototype 17 Oct 2004 First Gd-Octave autogenerated code Gd-Octave ported to GNU Autotools. 20 Nov 2004 First Octave-GTK autogenerated 08 Feb 2005 First Octave-libGlade autogenerated/ released 21 Feb Jan 2005 Glade hacked Listed as part of Debian Project GTK Project Octave Project: ? GNOME Project: ?

24/02/05 © Octave-GTK Team Octave-GTK, a language bindings project What can you do? ➢ Use Octave-LibGlade/Octave-GTK ➔ For your science/Engineering projects ➔ Make applications wit Octave- GTK. ➔ Use Octave-GTK for your work. ➢ Request features ➔ Ask for newer libraries for Octave- GTK. ➔ Ask for new type of API ➔ Ask for code/example/documents/demos. ➢ Write new Applications ➔ Stress test Octave-GTK. ➔ Report errors/results. ➢ Write Documentation ➔ Well how else could you get started? ➔ Support us! ➢ Write Code! ➔ Hack with us!

Evolution/Conclusion ➢ Octave-GTK Project is Evolving. 0.1 ➢ Octave-GTK will be industrial strength ➢ Version 0.2 slated for March 1st ➢ We are working! ➢ Furiously Hacking? ➢ GtkExtra, GtkWidgetFactory ➢ SWIG : Simplified Wrapper Generator ➢ Debugger: Octave Debugger ➢ Profiler: Profiler for Octave. ➢ Octave# compiler/Interpreter: 12/27/04 © ECE NIT-T, Muthiah A Octave-GTK, a language bindings project

Information ➢ ➢ ➢ ➢ ➢ /27/04 © ECE NIT-T, Muthiah A Octave-GTK, a language bindings project

The Team 12/27/04 © ECE NIT-T, Muthiah A Hemant Kumar Chemical Engineer NIT-T C++, OOP, Octave Ramasamy Chemical Engineer NIT-T C++, GUI,Octave t Muthiah Electronics Engineer NIT-T GTK, C, Testing Saravana Manickam Mechanical Engineer NIT-T Python, SWIG, C Octave-GTK, a language bindings project

Thanks ● The GNU movement, and free software. – Dr Richard Stallman ● GNU Octave John Eaton ● GTK Peter Mattis, Spencer Kimball, Havoc Pennington, OwenTaylor et- al ● The GNU/Linux OS Linus Torvalds et-al ● PyGTK James Henstridge ● GNOME Miguel De Icaza ● CSG Head Mr.Arun, Mr.Pradeep & Mr. Victor 12/27/04 © ECE NIT-T, Muthiah A Octave-GTK, a language bindings project

12/27/04 © ECE NIT-T, Muthiah A Octave-GTK, a language bindings project Q &A ● Contents of this slides are licensed under GNU FDL