1) EDU ON AIR – Introduction to GeoGebra Chrome App
Recorded in Las Vegas, while I was Sloan-C / MERLOT conference

2) EDU ON AIR – Using GeoGebra’s Geometry View
Recorded in Denver, Colorado close to the NCTM exhibition hall. There were some problems with the internet connection, but you can see the GeoGebra booth at the NCTM.

3) EDU ON AIR – Using GeoGebra’s Algebra View
Back in Budapest, algebra view.

4) EDU ON AIR – Using GeoGebra’s Spreadsheet View
Spreadsheet view, had some problems refreshing the views. New version came out soon after the hangout, so there shouldn’t be any more problems.

5) EDU ON AIR – Fun with GeoGebra
Invited some developers, GeoGebra Ambassadors. We are going to show some great applications and the future of the Chrome application.

Information to this episode:

• Zbynek showed how inequalities work in GeoGebra. Read more about inequalities by Guillermo our GeoGebra Ambassador.
• Play with the application Fabian created and presented.
• This is still Java based, but you have seen, it is going to work in the Chrome app soon.

Photo by Robin Smidsrød

The summit took place at the Google Headquarters in Mountain View. About 300 mentors worldwide came together to have an unconference about participant-driven topics including student selection process, events, financial questions of open source development, free software in education, and more. Lots of important FOSS took part in the sessions like LibreOffice, The GNU Project, KDE, Gnome, PHPBB, Joomla, Mediawiki, Inkscape and Xapian. GeoGebra was represented by Balázs Koren and Zoltán Kovács from Hungary and Austria.

Mentors from other mathematics related free software were also participating, namely Virgilio Gomez Rubio from the R project and Burcin Erocal from Sage. GeoGebra already has some kind of direct connections to both software, and this meeting was a good time to plan further developments between us.

As usual, Google offered a great hospitality to all participants. California was sunny during these days and it was a perfect time to make excursions to important places of the Silicon Valley and San Francisco as well.

San Francisco and the Golden Gate bridge from North

Sightseeing in Belgrade with Ivan, Gábor and Simon

In Serbia I took part at many nice talks. Maybe the best one, Alfred Wassermann’s new project Sketchometry was a real joy to see. The beta version already recognizes several gestures from the user, both by mouse on a PC or fingers on a tablet. By clicking the + sign on the bottom right, one can start to try this free product on ones own very quickly. Alfred confessed that the first minute was usually a bad experience for some users, but after then the usage became really intuitive and joyful. Anyway, this is really cool, as Gábor (the lead web developer at GeoGebra) mentioned after the introductory talk.

Sketchometry uses JSXGraph as its underlying DGS, and also Darko Drakulic, a contributor of GeoGebra in developing a numerical method for locus line visualization for Google Summer of Code (GSoC) 2011, wrote a nice frontend for it, and gave a talk about his development at the conference. JSXGraph, Wassermann’s main project in the recent years, seems to be a reliable backend for such lightweight GUIs. This is an important issue for smartphones, and at GeoGebra we also plan to reduce the application size as much as possible.

So, I’m back in Austria now, but the life did not stop here, either. Our fresh GSoC 2012 student, Damien Desfontaines did very good improvements on the area method for the OpenGeoProver subsystem. Now his brand new prover is capable of proving 18 theorems or statements from the 44 test cases. This result is remarkable enough if we consider his age (Damien is 19 years old!), the time he spent with the implementation (not more than 3 weeks), and that his work gives far the fastest computation for Desargues’s theorem (142 milliseconds).

Visit the Chrome Web Store and search for GeoGebra. Two Apps are there in the Store, one for the GeoGebraTube and the shiny new GeoGebra Web App.

After installing and launching the application, you should allow the app access to your Google Drive:

The app looks almost identical to the Java version:

And it not only looks like the Java version, but works like it too:

As a nice extra, today we’ve added Edit -> Insert Image from -> Webcam. You can then rotate/reflect/etc the image as you can do when you insert an image in the Java version.
You have to enable a flag in Chrome for this to work at the moment, details here:
http://www.geogebra.org/forum/viewtopic.php?f=48&t=27868

What is working:

Bonus features that the Java version doesn’t have:

We hope to soon start work on adding: