If you want to try out various values for a variable, you can use a slider. A slider can take on any value within a given interval.
Use the tool Slider
to input two sliders a and b. Make a point by writing
You can change the minimum, the maximum and the increment. If you right-click on the slider you can choose Animation on.
The default value for a slider is
Fix Object (so you don't accidently
move the slider when trying to change the slider value). As long as the slider tool is selected it is possible to move the slider.
In order to move the slider freely, regardless of what tool is selected, right-click
on it and uncheck
Export as animated gif
You can use a slider to export an animated gif. The animation must only rely on one slider, so if your animation uses several sliders, you must rewrite the slider dependencies using linearity. If you for instance want to use the resulting gif on a web page, don't use too many steps. Each step results in one image stored within the gif-file. The small gif to the right uses 140 steps and is 889 KB. The large applet at the top of the page uses 43 200 steps and is 12 KB (and the animation takes approximately 12 hours).
Exercise 1 - Make a pool table
You can vary the speed of the sliders and turn off trace by right-clicking.
Exercise 2 - Make a clock and an animated gif
Follow the instructions to make a clock, or watch the recording below.
Set up the slider
A minute extends 6 degrees on an analog clock. If using a slider we can set it to use 360 degrees and make the increment 6. If we also want to depict hours we need 12 times as many steps on the slider.
If using the unit degree on a slider we can not have more than 360°. It is hence easier to use normal numerical values and then change them into degrees afterwards.
Then choose the animation tab and choose
Make the rotating points
Using polar coordinates, one can enter two points for minutes and hours like this:
Adding the ° symbol will convert the numbers to degrees. You can add degrees by clicking Ctrl+o.
The points move in a counter-clockwise direction starting at the x-axis. Adjust this by changing
the polar angles to
Export to gif
Add visual elements and hide the objects that should not be shown. Make the graphics view the size you want
on the gif. Then choose
File->Export->Graphics View as Animated GIF.
by Malin Christersson under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 Sweden License