MAG(6D) MAG(6D)
mag - pixel replication and magnification in a window
/usr/sbin/mag [integer]
Mag copies and enlarges areas of the screen. The mag program demonstrates
pixel reading and writing on the IRIS. The area of the screen copied is
chosen by the user with the mouse. The power of magnification is an
integer value which must be entered into the command line. If no integer
is specified, the default value of the power of magnification is 2.
Operator control of this demo is strictly with the mouse.
Mouse buttons Function
left pick area on screen under cursor
right mag pop-up menu
It is important to note that the program needs to maintain input focus
when selecting a region under the cursor. This can be achieved by
positioning the cursor in the mag window and then depressing
either the Shift or Ctrl key. While continuing to hold the key, move
the cursor to the desired location on the screen and click the Left
mouse button.
Values of magnification greater than 2 significantly degrade the
magnified image.
Trying to magnify the mag window causes some inexplicable results.
Sometimes, when the window manager is in double buffer mode, the area
magnified appears in the wrong color. The mag program works best in
single buffer mode.
In release 4.0, there is a known problem with mag on VGX machines
relating to the use of subpixel. The symptom is the initial appearance
of a grid inside the mag window even when the popup menu item "grid off"
is selected. The workaround for this is to change the line in the source
for mag, located at /usr/people/4Dgifts/iristools/tools/mag.c that reads
subpixel(1);
to read
subpixel(0);
This is not the best solution but it will work. The problem here centers
on old-style drawing commands like rectfi and point sampled polygons
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MAG(6D) MAG(6D)
which are turned on with subpixel(1). This program will be revamped to
not use rectfi and the math will consequently be "changed by one" as
well.
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