GeoGebraTouch Blog

Notes about the GeoGebraTouch development.

First Week

• Gestures (Analysis)
  • MT4j is compatible with java 1.5 (But the given examples were not running on the Java 5 :( ).
  • It can be integrated with Swing applications.
  • Size of the library is overwhelming(more than 10 MB), but a selective implementation will do the work.
  • Includes many more features that can be further added to GeoGebra.
  • Over and above, it is well documented, and a lot of applications have already been created using this framework.

• OCR
  • Went whole through the Neuroph, only to discover that the size of the libraries itself is 10 MB (Felt lost).Dropped the same.
  • Found a lot of other implementation such as : ​http://cs.felk.cvut.cz/~koutnij/studium/jocr/jocr.html ​http://www.cs.princeton.edu/academics/ugradpgm/spe/summer06/negoescu/ ​http://www.heatonresearch.com/articles/42/page1.html. After Yves recommendation, zeroed in on the last one.
  • Read the book Introduction to Neural Networks for Java,by Jeff Heaton. Just the first few chapters were enough to brush up my concepts.
  • Studied the code for the Applet. (Still many things are not clear).
  • To do :-
    

Transforming the Applet to a standalone application, so that it can be used elsewhere or maybe add applet to a frame, so that it can be run without a web browser.

Add a text-box, and modify it for the purpose.

Alter the size of the grid(increase) so that better recognition of character is possible.

Add the characters to the HANDWRITING array.

Add a button to transfer the control form the frame to the GeoGebara and transfer that particular formula from the text box to the textfield in GeoGebra.

NO need to draw the downsampled image, or maybe. (?)

Add a list box to view options, based on the evaluated value of the output neuron.

Second Week

• OCR
  • Even after the increasing the size, the thing was not giving good results.
  • Tried adding all the character required, but it messed up the whole thing.
  • Integrated the OCR Application with GeoGebra.

Third Week

• OCR
  • Switched to Neuroph again.
  • Modified the Layout.
  • Added Menu for the same.
  • Added functionalities for the Native inputs.
  • Learnt lots of lessons.

Fourth Week

• OCR
  • Added click on list.
  • Added timed recognition and other related features, still a few minor bug persists :(.

Fifth Week

• Multi-touch
  • Tried adding it thorough interfaces, the whole thing backfired.

Sixth Week

• Multi-touch
  • Extended the Abstract Shape classes, to be used by all the elements of the GeoGebra, so as to give multi-touch facility to all of them.
  • Struck on the null pointer thing.