(enhanced introduction and added "basic scripting" section)
|Line 31:||Line 31:|
== ToDo ==
== ToDo ==
Revision as of 20:59, 6 November 2011
Sometimes the ways students can interact with your worksheets using the basic features provided by GeoGebra are not powerful enough or too difficult to be used by your students, especially younger ones. GeoGebraScript is there to help you creating simple-to-use constructions with more sophisticated interactivity. It is a simple way to write scripts (small programs) in GeoGebra.
Common uses of scripting are:
- Checking student's answers by letting them enter their answers into textfields and using scripts to check if they are correct.
- Creating new tasks / challenges after the student pressed a button, either randomly generated or using a set of challenges defined by you.
- Starting animations or revealing new parts of the construction after the student pressed a button or finished his task.
- (and so on..)
There are not only tools to create an object in GeoGebra. You can do the same with commands and the input-bar.
Circle[(1,2),3]you'll get a circle with the center at (1,2) with a radius 3.
Even if you use the tools to create an object, the command to get this object via input bar can be found in the Properties Dialog behind Definition. So, tools are more or less only a help to enter those commands with the mouse. A list of all commands to create an object can be found here.
But there are some commands that do not create an object. These commands are especially for scripting. See Scripting_Commands.
Basics of Scripting
Scripts are, at heart, just a sequence of GeoGebra commands executed in the following two situations:
- Click: A script is executed after the user clicked on the object.
- Update: A script is executed when the value or properties of the object changed. This may happen if the user moves elements of the construction around, changes sliders, etc.
If you know something (a little) about scripting: You're help and participation is very welcome! You could add something for the following topics or think of something else:
- More step-by-step instructions for beginners
- Explanation of "scripting objects": Textfields (!!), buttons
- More concrete examples (also links to GeoGebra files using scripting)
Instead of using a showing a slider to go through a step-by-step explanation, you can use a button.
- Create an integer slider, called
- Create a Button using Button Tool
- Enter for caption the visible label ob the button
- Enter the script
Steps=Steps + 1
To decrement change "+" to "-". To change the size of the steps change 1 to your value.
Steps=Steps + 1is only available in scripting. If you enter a command like that in the input bar, you'll get an error circular definition