Developed by Judy D. Halchin (jhalchin@alleg.edu), Educational Computing Services, Allegheny College, Meadville, PA 16335.
Discipline: Programming
PtrNumberLine is a subclass of NumberLine, which displays a mathematical number line. It inherits from NumberLine the ability to compute and display tick marks and labels, to set various graphics attributes, and to set the range of values displayed.
A PtrNumberLine displays a horizontal number line and an arrow which can be dragged along the line by the user to choose particular values. An action message can be sent to a designated target as the arrow is dragged, or the PtrNumberLine can be queried for the current value.
PtrNumberLine is available from a dynamically loaded InterfaceBuilder palette.
This application was developed under NeXTstep release 2.2.