Q E P C A D - Plotting of 2D CADs

Although currently not developed in a way that's easy to use or fast, QEPCAD is able to produce eps-file plots of CADs of 2-dimensional space. It seems like something people might like to have, so I offer it "as is".

The Basic Command Once QEPCAD has constructed a CAD of 2-space (usually you'd see the solution prompt, though possibly still the choice prompt) you can produce an eps-file plot with the command

p-2d-cad xmin xmax ymin ymax stride filename [z|Z|c|C]

The result is that a file named filename is created, which gives a plot in eps-format of the region [xmin,xmax]x[ymin,ymax]. The plot is produced by analyzing the topology of the CAD, then sweeping through from left to right and in increments of stride adding points to the model of the CAD. This doesn't change the topology of the model, it just makes the picture look prettier. In these plots where the view is [-2,2]x[-2,2], the stride varies from 2.5 to 0.25 to 0.025:

There are some optional paramters:

What to Do With the eps-file If you're not familiar with eps-files, you may not know what to do or how, so:

While it may be pretty unappetizing to some people, you can open up the eps file in any text editor and make some changes if you don't like what I did. For example, if you don't like the colors, you can edit the block:
%% This defines some default colors.
/DarkTrue { 0.2 0.4 1.0 setrgbcolor } def
/LightTrue { 0.2 1.0 1.0 setrgbcolor } def
/DarkFalse { 0.8667 0 0 setrgbcolor } def
/LightFalse { 0.8667 0.8667 0.8667 setrgbcolor } def
that appears near the top of the eps-file. Just stick in your own rgb values (I chose these randomly!).


QEPCAD account {Prof. Brown}
Last modified: Tue Jul 30 10:30:40 EDT 2002