Difference between revisions of "Comments:Slider Tool"

Revision as of 11:39, 11 October 2010

Tips

Flexible Bounds

A normal slider can just be defined for a constant interval, i.e. the interval can't be influenced by worksheet variables. But sometimes it's necessary to create a slider for the user with flexible bounds, let's say from a to b. That's not possible directly, but one can achieve a similar effect:

Create a slider t in the interval [0, 1]
Use interpolation to calculate the "real value" c (in the interval [a, b]):
```
c = a + (b - a) * t
```
Hide the label of the slider
Place a text object with the content "c = " + c at the old label's position

Such a slider works almost exactly like the normal one (exception: the label isn't moving, that needs some additional work), so your users probably won't notice.

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-[[Category:Commands]]
+== Tips ==
+=== Flexible Bounds ===
+A normal slider can just be defined for a constant interval, i.e. the interval can't be influenced by worksheet variables. But sometimes it's necessary to create a slider for the user with flexible bounds, let's say from ''a'' to ''b''. That's not possible directly, but one can achieve a similar effect:
+# Create a slider ''t'' in the interval [0, 1]
+# Use interpolation to calculate the "real value" ''c'' (in the interval [''a'', ''b'']): <pre>c = a + (b - a) * t</pre>
+# Hide the label of the slider
+# Place a text object with the content <code>"c = " + c</code> at the old label's position
+Such a slider works almost exactly like the normal one (exception: the label isn't moving, that needs some additional work), so your users probably won't notice.