These functions are used to allow user interaction. tkrplot package is needded.
'+'
Increments fisheye distortion factor. Same functionality using mousewheel.
'-'
Decrements fisheye distortion factor. Same functionality using mousewheel.
'0'
Increments animation smoothness.
'.'
Decrements animation smoothness.
Mouse Double Clicking
Retunrs closest point.
Mouse Middle Clicking
Draw a circle and returns and object of class vector called 'insiders' with every element inside. "insiders" object will be created in POI.env. (POI.env$insiders)
Mouse Click Motion
Drag points over. Basic interaction which allows you to move any point to the center of the disk, where detail is augmented.