User Preferences and the File System
Every time you launch Graphique, it starts over. Any equations you've entered disappear. Any graphs you've created, however clever or stunning, vanish. Graphique has no permanence. This might be fine for utility or one-shot applications, but users expect more out of applications like Graphique. They expect to be able to recall recent work or preserve output. They also expect to be able to set some preferences to customize behavior. In this chapter, we add some permanence to Graphique.
One of the things we do in this chapter is finally use the Fonts and Colors toolbar items to allow users to set the font used to enter equations and the color used to draw the line of the graph. We also implement ...