IRIS 3010, User Manual

Page: 117 / 145

Version 1.0 SERIES 3000
IRIS OWNER’S GUIDE 8-5 Video Options
With a low-resolution monitor, you should also reduce the size of the
viewport, using the
viewport
command:
viewport(left,right,bottom,top)
To map the graphics output to the entire screen, specify the exact available
pixel range:
NTSC monitor
viewport(0,635,0,484)
PAL (European video standard) monitor
viewport(0,779,0,574)
The
ortho
commands control the mapping of graphics coordinates to screen
coordinates. Used in conjunction with the
viewport
command, the
ortho2
command lets you program in screen coordinates on low-resolution monitors.
To establish a one-to-one mapping of graphics coordinates to screen
coordinates, use parallel ranges in the two commands:
NTSC monitor
ortho2(-0.5,635.5,-0.5,484.5)
PAL monitor
ortho2(-0.5,779.5,-0.5,574.5)
If the graphics programs are run on a low-resolution monitor with the default
viewport specifications, only the lower left portion of the image will be visible
on the screen. U
nix
will not work in NTSC or PAL mode because it requires
more pixel area. To run U
nix
, switch to a high-resolution monitor with
setmonitor
.
If you design a program to run on both high-resolution and low-resolution
monitors, keep in mind that fonts have a fixed pixel width. This means that
text on one monitor will appear different on another monitor.