David Chandler, 19/4/2015

Prepared for Geogebra Global Gathering 2015

I produced a large set of demonstrations for a geometry course using The Geometer's Sketchpad. I later decided to port these over to Geogebra. I encountered challenges when Geogebra did not implement certain features present in The Geometer's Sketchpad. I found work-arounds for most of these features, however. Hopefully Geogebra will grow to include some or all of these features in the future, but for now they can be had with a little extra work on the "programmer's" part.

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Geogebra does not contain a native tool for radio buttons: buttons where only one item can be selected. This can be worked around by ...

• 1. Radio Buttons and Clear Button
• 2. Two Levels of Radio Buttons with Variants

What if you want to create an animation that executes a series of operations, A, then B, then C. I will be demonstrating a technique you can use, using an animated slider as a "master clock," then breaking down intervals into sub-clocks. This is an important enough topic that it should be considered for a future version of Geogebra as a feature implemented more smoothly.

• 1. An Applet Involving Multi-stage Animation
• 2. Another Applet Involving Multi-Stage Animation

I would like to show the attached video as my 15 minute talk. In it I walk through the process of creating radio buttons and variations, and multi-step animations. Recommendations for future versions of Geogebra: --Add Radio Buttons (or at least round icons as an alternative to the square check boxes). --Add multi-step movement control to facilitate more easy animation.

• 1. My Talk