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== Summary ==<br />
<br />
<br />
== Category ==<br />
Interaction<br />
<br />
== Context ==<br />
The parameter values for a particular task are ill defined. Direct interaction with visual objects in the display is possible.<br />
<br />
== Problem ==<br />
How to explore the dataset.<br />
<br />
== Forces ==<br />
* Need to explore and manipulate dataset.<br />
* Task types include selection, filtering, and navigating.<br />
<br />
== Solution ==<br />
'''Use direct manipulation style interaction. Allow the user to select and manipulate objects directly in the scene.'''<br />
<br />
[[Dynamic queries]] are an excellent mechanism for providing rapid, easily<br />
reversible actions on the scene. However, sometimes it is difficult or less<br />
intuitive to map an action onto a control. Instead the action should be<br />
applied directly to the object or objects in the scene. Selecting objects by<br />
using a bounding box is a good example. The classification that the user<br />
has determined by looking at the objects may be difficult to describe in<br />
terms of the values of those object’s attributes and therefore difficult to<br />
set the associated controls correctly. However, by using a bounding box<br />
or by clicking on individual items, the user can easily select the desired<br />
set.<br />
<br />
During our daily routines we often pick up objects, move them, rotate<br />
them, and so on. Using direct manipulation in a display more closely<br />
matches our everyday experiences.<br />
== Examples ==<br />
* Selective Dynamic Manipulation <ref>Chuah et al. (1995). SDM: Selective Dynamic Manipulation of Visualizations. In: The 8th<br />
ACM Symposium on User interface and Software Technology. Pittsburgh, Pennsylvania, USA, 15-17 November 1995. pp 61-70.</ref><br />
* Brath <ref>Brath, R. (1999) Effective Information Visualization : Guidelines and Metrics for 3D<br />
Interactive Representations of Business Data. Masters of Computer Science Thesis, Graduate<br />
Department of Computer Science, University of Toronto, Canada.</ref><br />
<br />
== Related Patterns ==<br />
<br />
== References ==<br />
<references/><br />
<br />
See also: Wilkins, B., (2003). “MELD: A Pattern Supported Methodology for Visualisation Design”, PhD Dissertation, University of Birmingham, UK.</div>Thatbrock