{ (define LIBNAME "A Geometry Library (HtDC)")
(include "head.tinc") }
This geometry
package provides a class for representing
positions in a Cartesian world:
+----------+
| Posn |
+----------+
| int x |
| int y |
+----------+
To create an instance of the Posn
class, a program must supply
two int
values: one for its x coordinate of the canvas and the
second for its y coordinate.