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<HTML>
<HEAD>
<TITLE>WIP Version 1.5 Changes</TITLE>
</HEAD>
<BODY>
<H1>WIP Version 1.5 Changes</H1>
This version primarily reflects corrections and enhancements to WIP:
<OL>
<LI> The commands NEW and FREE have been enhanced to allow multiple user
variables to appear in one command. This means that NEW vectors
are defined as "NEW VEC[SIZE]" rather than as "NEW VEC [SIZE]"
(ie. the size is still enclosed in brackets, but now is not a
separate argument but appended on the end of the name). These
commands have also been changed so that they are automatically
inserted into the command BUFFER. This is because if a user
created a new variable interactively and then called FREE and then
PLAYBACK, the variable would no longer exist and cause an error.
<LI> The command ECHO have been enhanced to permit multiple user
variables to be displayed on the same line. In addition, arbitrary
strings may also be displayed along with the user variables.
Arbitrary strings are delimited by a set of double quotes.
<LI> The command HEADER was modified to expand the pixel range by 1/2
in each direction along each axis. This is to account for pixel
size and to make sure that the entire pixel is displayed. By doing
this, when an entire image is displayed, the contour lines will not
reach the edges of the box.
<P>
The command HEADER was also modified to get the header information
from user variables rather than the image header. When an image is
loaded, the header items CRVALX/Y, CRPIXX/Y, and CDELTX/Y are read
from the header (if possible) and are then stored as user variables
of the same name. For BASIC images (or images with no header
information), the user may use the command SET to assign values to
these variables and then call HEADER to properly set up the
transfer function and the World limits.
</P>
<LI> The command ARC was drawing in different directions depending on
the orientation of the World coordinates. There was no easy way to
always make the angle increase counter-clockwise, so it has been
changed to use the following convention: All angles are presented
in degrees and are defined as zero along the POSITIVE X-axis and
increases towards the POSITIVE Y-axis.
<LI> A new command WEDGE has been added which will fill the entire
viewport with a halftone ramp. Commands such as BOX may follow
this command to annotate the ramp.
<LI> A new command SLEV, new user variable SLEVEL, and new string
variable LEVTYPE have been added to permit contour level scaling.
The scaling does not affect the array filled by the commands LEVELS
and AUTOLEVS. Instead, when the command CONTOUR is called, a local
array is filled with the LEVELS array scaled properly and this
array is passed to the contour routine.
<LI> A new user variable called HARDCOPY has been added which is 1 if
the current device is a hardcopy unit; 0 if it is interactive.
This variable is set every time the command DEVICE is called and
is provided to test the type of device.
<LI> Whenever a device is changed, the command PANEL is reset. This was
done to make sure that the next call to PANEL would not use the
previous device's viewport range.
<LI> A new command HI2D has been added. This stacks histograms of an
image. Not much to look at. A better routine would be a surface plot.
<LI> The command SHOW was modified to accept an optional string argument
that will control what is shown. This helps to control what is
shown on the display to what is actually needed. If this becomes
widely used, then some sort of string variable will probably be
needed to act as a default. Currently, no argument is the same as
the old SHOW (show everything).
</OL>
</BODY>
</HTML>
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