AIPS HELP file for TVWEDGE in 31DEC21
As of Wed Oct 20 18:08:20 2021
TVWEDGE: Verb to load a step wedge of image intensities as
previously loaded (shows only the map values actually
Optional immediate argument gives width of wedge
in pixels (default 16). If argument < 0,
program uses TV cursor to determine where to
put wedge (default below bottom or above top
of image). Point to left or right of image
to get a vertical wedge.
Uses TV cursor to select the image with which
the wedge is associated (if needed).
Use: To load a linear wedge into a TV memory plane using the same
transfer function and clipping used in loading the associated
image. TVWEDGE constructs the wedge with intensities from the
PIXRANGE(1) to PIXRANGE(2) used in loading the image to the TV.
If there is more than one image on the TV, the routine asks the
user to point out the image with which the wedge is to be
associated. There is an optional imediate argument:
If n is missing, use n=16, where n is the width of the wedge in
pixels. If n<0 use abs(n) as the width of the wedge and ask
the user to indicate where to draw the wedge. The default
locations of the wedge are: (a) If there is only one image
visible, far enough below or above the image to allow for
complete labeling, (b) just below the image (if it will fit),
(c) above the image (if it will fit), and (d) overlaying the
bottom rows of the image.
To get a vertical wedge, use n < 0 and select a point to the
right or left of the image. The X position you select is taken
as the left edge of the vertical wedge. For horizontal wedges
use n > 0 or, with n < 0, point below or above or inside the
image. The point you select is the bottom of the horizontal
Note that, if TVWEDGE is used in a FOR or WHILE loop or in an
IF-THEN-ELSE construct, then the immediate argument is
required. Otherwise, some item necessary to the loop/construct
will be taken as the immediate argument.