At this point in its evolution, Graphique indeed means something. It does something. It's serviceable. It accepts an equation, evaluates it, and lists x, y values. It's also a little embarrassing: it's a graphing calculator that doesn't graph. That flaw is difficult to hide or gloss over. We can't really be proud of Graphique until it graphs equations.
The equation entry field is a little shameful, too, in a Notepad kind of way: monochromatic text, stiff syntax, and anemic validation. Before we can be proud of Graphique, we must provide a better equation editor.
In this chapter, we create graphs, and we improve the equation editor. By the time we're done, the UI for Graphique will look like Figure 4–1.