Google Summer of Code 2015

GeoGebra Summer of Code 2015

This summer, GeoGebra was again part of Google Summer of Code (GSoC) supporting young and talented open source coders. We had a very strong field of 64 students applying and were able to choose 4 of them to work with us during this summer. There were also some impressive contributions submitted by many of the other candidates which have already been incorporated into GeoGebra.

Yi-Chun (Jacky) Kuo: Native iOS App



Our current iPad app is based on a WebView so we were interested to see if Jacky could make a prototype of a native app using the quite-new RoboVM cross-compiler to convert GeoGebra?s Java code into Objective C. As part of his application he managed to get the JLaTeXMath formula engine working which was very impressive in its own right. For the first half of his project he got the full GeoGebra kernel compiled and running and for the second half he worked on drawing objects and user-interaction.

There is still a lot to do before we can make a release (for example implementing the toolbar and equation editor) but Jacky will stay on with GeoGebra after GSoC to help!


GeoGebra running in Xcode

Georgios Ouzounis: Handwritten Equation Recognition



Image showing handwritten 6x^4 + sqrt of 7x over 8+x = 4y^3 recognized and converted to an equation

Handwritten equation recognized!

Georgios made a nice web app as part of his application to collect example handwritten equations from phones and tablets and store them in a database. This was important as it allowed him to use that data when testing and training his algorithms. The three parts to his project were:

  • splitting the equation into its symbols
  • recognising the symbols
  • converting that back into GeoGebra syntax

and by the end of his project it was successfully recognizing indices, fractions and square-roots. At the moment the code is running server-side and is a little slow so the challenge for the future will be to get it running faster and client-side. Open Source libraries used: OpenCV

Thilina Madumal: Intersection Project


Polygon Intersections in 2D and 3D

Polygon Intersections in 2D and 3D!

As part of Thilina?s application, he adapted the Clipper library to compile with Java 6 and with GWT and incorporated it into GeoGebra, which he then used as part of his main GSOC project to improve the polygon operations within GeoGebra.

He has also done a lot of work on improving the Intersect command to allow the intersection of many more object types to be calculated dynamically.

Shamshad Alam: Implicit Curves Project


Family of curves cos(x y) = k

cos(x y) = k

3D plot of x^4+y^4+z^4=2

x? + y? + z? = 2

Polygon shown with an extra thin "path" drawn all the way round the outside

Shamshad also made some nice experiments with the Clipper library as part of his application

The main focus of his GSoC project was to implement plotting of implicit curves and surfaces, namely:

  • plotting of non-polynomial implicit curves (for example you can try sin(x) – sin(y) = 1 in GeoGebra Beta)
  • plotting of implicit surfaces (eg x? + y? + z? = 2)
  • extending commands for rotation, translation and other transformations to work with these object types

Thanks to all our GSoC students for a great job done during this summer!

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New Equation Editor and Keyboard

We’ve made some nice changes to our Chrome, Web and Tablet apps recently that many of you have been asking for. The first exciting feature is that the Input Bar in the Algebra View has expanded into a fully-fledged Equation Editor, for example:


and it also works fully with GeoGebra commands:


It’s now also much easier to add and edit matrices, parametric curves and piecewise-defined functions:


We’ve also added a touch-friendly on-screen keyboard that supports many languages and works nicely with our new equation editor:


You can try these cool new features in any of our web and tablet apps!

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Fast, Beautiful LaTeX comes to GeoGebraTube

We’ve got a major change to GeoGebraTube and our Chrome App coming on 13th June. We are updating the formula renderer (otherwise known as LaTeX renderer) to use the same version as in the desktop version. This means that mathematical formulas in our applets and web application will now look just as beautiful as they do in GeoGebra’s desktop version. This will work with all existing formula commands as well (for example TableText, FormulaText, FractionText, StemPlot).

some example formulas drawn with the new LaTeX engine

You can try it out in the beta Chrome App at and you can preview how your worksheets will look after the change on, for example compare:

Current version with old formula rendering:

New version using our new super-pretty formulas:

If you have any questions or suggestions concerning these new updates, please write us at

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GeoGebraExam – die neue Prüfungsumgebung

Wir haben nachgedacht, wie man GeoGebra auf Schülerlaptops in Prüfungen verwenden könnte, ohne dass man dafür einen eigenen Prüfungsstick braucht. Das Ergebnis lautet GeoGebraExam.

Wie bekommen Sie GeoGebraExam?

  1.  Laden Sie GeoGebraExam für Windows oder Mac herunter:
  2. Unter Windows: Entpacken Sie die zip-Datei
    Starten Sie GeoGebraExam durch Doppelklick auf die Datei
    Unter Mac: Doppelklicken Sie auf GeoGebraExam, um es zu starten


Wie funktioniert GeoGebraExam?

  • GeoGebraExam startet GeoGebra im Vollbildmodus, aus dem man erst durch Schließen von GeoGebraExam (Menü rechts oben) wieder herauskommt
  • Zu Beginn erscheint ein Dialog, um die Prüfung zu starten. Die Lehrerin gibt das Kommando, wann alle Schüler gleichzeitig auf “Prüfung starten” klicken sollen. Ab diesem Zeitpunkt läuft ein Timer, der Sekunden und Minuten anzeigt. Damit kann die Lehrerin jederzeit kontrollieren, dass ein Schüler auch die ganze Zeit in GeoGebraExam war. Wer zwischenzeitlich aussteigt und GeoGebraExam dann wieder neu startet, hat eine andere Timer-Zeit am Bildschirm als alle anderen – und damit besteht natürlich hoher Schwindelverdacht …
  • Von GeoGebraExam kann man nur sehr schwer in andere Programme wechseln, so sind z.B. die Windows-Taste zum Erreichen des Desktops sowie viele Tastenkombinationen zum Wechseln in andere Programme deaktiviert. Sollte ein Schüler dennoch einen Weg finden, GeoGebraExam zu verlassen, dann wir der Timer mit rotem Hintergrund angezeigt. Damit weiß eine Lehrerin sofort, dass die Prüfungsumgebung zwischenzeitlich verlassen wurde – damit besteht natürlich ebenfalls hoher Schwindelverdacht …
  • Am Ende der Prüfung kann GeoGebraExam über das Menü rechts oben und “Schließen” verlassen werden. Ein zusätzlicher Dialog verhindert, dass ein Schüler GeoGebraExam “aus Versehen” verlässt

Wir denken, dass GeoGebraExam eine einfach Möglichkeit darstellt, GeoGebra in Prüfungen auf Schülerrechnern zu verwenden, bei denen nichts abgespeichert werden soll, sondern GeoGebra lediglich als Werkzeug neben der “Papierprüfung” zur Verfügung steht.

Über Ihre Erfahrungsberichte und Anregungen an freuen wir uns!


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GeoGebra Global Gathering

We are happy to inform you that the official registration and abstract submission for the GeoGebra Global Gathering Conference are now open.

Join us at our GeoGebra Global Gathering (G3, 2015) July 15 – 17 in Linz in Austria and register now!

Because there is only a limited number of participants we can host, we highly recommend to register for our gathering as soon as possible to make sure you can join us this July. Please find more information about all the practicalities in our G3 2015 GeoGebraBook.

We are looking forward to seeing you this summer in Linz!
Markus and the GeoGebra Team

GeoGebra Global Gathering 2015

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