# QuickDraw Grid

The unit at [drv/mac68k/qd.fs] is an implementation of [io/grid] using Quickdraw
to draw characters. Because 640x480 is really tight, we use the a 10px font size
rather than the default 12px one.

One can see why proportional fonts are used by System 7 on such a machine, but
if we want a grid, we need to have fixed coordinates, so 12px is too big. This
gives us a grid of only 53x40. At 10px, this gives us 64x48, which is still a
very tight grid, but at 8px, the characters begin to be very difficult to read
on the Mac, so I went with 10px.

## Initialization example

  needs drv/mac68k/qd
  qd$ qdgrid$
  ' gridrtype RTYPE !
