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. Un i x will not work in NTSC or PAL mode because it requires
more pixel area. To run Un i x , 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.
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