character uses the top eight dots, write in a one next to the word “Descender” on the layout grid; if it uses the bottom eight dots, write in a zero. In our example, we’ll want the bottom of the flask to line up with the baseline of the other characters, so it will not be a descender. As shown in Figure 9-5, we’ve written in a “1” on our grid.
64I | I | | Descender 1 |
| | |
I! | | 7 | :t | |
32I | I | | Start | column |
| End column |
| | | M, = | Descender * 128 + (Start • 16) + End |
Total
Figure 9-5.We’ve designed a character and decided that rt would not be a descender, hence the “1” written in.
H Rule 2: Dots cannot overlap
As you can see in Figure 9-5 our flask has a nearly continuous outline. But, you may ask, why not make it a reaZZysolid line and print all the intermediate dots, as shown in Figure 9-6? Be- cause the dots that straddle the vertical lines in the grid actually overlap those inside the boxes. If we tried to print overlapping dots, the SR-IO/l5 printhead would have to slow down and back up to print both dots-not very efficient! To avoid this inefficiency, SR-IO/l5 will not allow you to define a character like Figure 9-6. (Actually, you can define it, but when it prints, SR-10115 will leave out the overlapping dots, so that it would print like Figure 9-5.)
