TrackingFunction
is an option for Manipulate controls that specifies functions to use during interactive changing or editing.
Details
- TrackingFunction gives access to the second argument of Dynamic in the underlying control.
- The Manipulate argument {u,…,TrackingFunction->f} represents a control that continually evaluates f[val,u] during interactive changing or editing of val.
- The default setting of TrackingFunction is equivalent to (u=#)&.
- TrackingFunction can be set to a function or a list of up to three functions.
- For interactive mouse operations, TrackingFunction->{fstart,f,fend} typically evaluates fstart[val,u] once when the mouse is pressed, then evaluates f[val,u] whenever the mouse is moved, and then evaluates fend[val,u] once the mouse is released.
Examples
open all close allBasic Examples (2)
TrackingFunction can be used to set more than one variable at a time:
TrackingFunction can be used to enforce restrictions on a control:
Two-dimensional controls like Locator can be restricted to regions:
Locator tracking functions can make use of CurrentValue["CurrentLocatorPaneThumb"] to enforce different restrictions on different points:
Possible Issues (1)
The TrackingFunction is only active when interacting with the control. Changing the variable in other ways will not pass through the TrackingFunction:
Text
Wolfram Research (2014), TrackingFunction, Wolfram Language function, https://reference.wolfram.com/language/ref/TrackingFunction.html.
CMS
Wolfram Language. 2014. "TrackingFunction." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TrackingFunction.html.
APA
Wolfram Language. (2014). TrackingFunction. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TrackingFunction.html