This project demonstrates the use of the Rubberband object in a program called Rubberview. The Rubberband object is described in Rubberband.rtf.
Several people on comp.sys.next.programmer pointed to /usr/lib/NextStep/windowPackage.ps as an example of how to implement a rubberband rectangle on the NeXT computer. But no one ever really went beyond saying it could be done. This Rubberband object shows how it can be done by making direct use of the postscript in windowPackage.ps. When you use this object you are using the same code that the window manager uses when resizing standard windows.