Next Prev Up
1.5 Programming Considerations
The major programming considerations are as follows:
Keyboards are the greatest variable between different
manufacturer's workstations. If you want your program to be
portable, you should be particularly conservative here.
Many display systems have limited amounts of off-screen memory. If
you can, you should minimize use of pixmaps and backing store.
The user should have control of his screen real-estate. Therefore,
you should write your applications to react to window management,
rather than presume control of the entire screen. What you do inside
of your top level window, however, is up to your application.
Coordinates and sizes in X are actually 16-bit quantities. They
usually are declared as an
int16 in the functions. Values larger than 16 bits can be
truncated silently. Sizes (width and height) are unsigned quantities.
The types color, colormap, cursor, display, font, gcontext, pixmap, screen, and window are defined
solely by a functional interface. Even though they are treated like
structures in this document, it is not specified whether they are
implemented as structures or classes. Although some interfaces are
described as functions, they are not required to be defined using
defun. (It is a requirement that they be functions as opposed to
macros or special forms.)
Next Prev Up
© 1988, 1989 Texas Instruments
Conversion to HTML made by
Last build: Tue Dec 16 23:30:42 1997