KnotPlot script for fancy_fillA

This page gives an example of a KnotPlot script that can be used to generate an Encapsulated PostScript (EPS) file. A bitmap preview of the EPS file is shown below. The EPS file is vector graphics, and is generally higher quality than the preview. To play with the KnotPlot script, you will need to download a copy of KnotPlot.

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Following is a detailed description on how the KnotPlot script was used to generate the files on this page. Example shown is for letter size paper. See the note (right) about printing to A4 paper. If you're only generating an EPS file for inclusion in another document, then you don't need to worry about setting the pagesize.

Run KnotPlot in non-graphics mode to generate the EPS file.

knotplot -nog < fancy_fillA.kps

We now have the file fancy_fillA.eps which could be printed directly on a PostScript printer. For printing to a non-PostScript printer, generate a PDF file fancy_fillA.pdf from the EPS file fancy_fillA.eps using GhostScript.

# Note: enter the following three lines on one command line
gs -dCompatibilityLevel=1.3 -q -dNOPAUSE -dBATCH
   -sPAPERSIZE=letter -sDEVICE=pdfwrite
   -sOutputFile=fancy_fillA.pdf -c .setpdfwrite -f fancy_fillA.eps

The remainder of this example shows how the preview image seen above was created. This is only useful for including an image on a web page. Printing the EPS or PDF file will give much higher quality than printing the preview image. These files, fancy_fillA.eps and fancy_fillA.pdf, as well as their counterparts for A4 paper, fancy_fillA_a4.eps and fancy_fillA_a4.pdf, can be downloaded using the links in the right hand panel on this page.

# run GhostScript to generate a temporary PPM file
# Note: enter the following two lines on one command line
gs -q -dNOPAUSE -dBATCH -sPAPERSIZE=letter -sDEVICE=ppmraw
   -sOutputFile=fancy_fillA.ppm -r200 -f fancy_fillA.eps
 
# scale it down
pnmscale -xsize 600 fancy_fillA.ppm > fancy_fillAS.ppm
 
# reduce the number of distinct colours
ppmquant 32 fancy_fillAS.ppm > fancy_fillASq.ppm
 
# create the GIF file
ppmtogif fancy_fillASq.ppm > fancy_fillA.gif
 
# delete temporary files
/bin/rm fancy_fillA.ppm fancy_fillAS.ppm fancy_fillASq.ppm

KnotPlot script that generated the Encapsulated PostScript (EPS) file:

% KnotPlot script: fancy_fillA.kps
 
% Based on 23oct03a.kps from psexamp

all 9999
ortho

cyl=.4
psmode=41
pserase=2
psop bbox small

%unknot 4
%about z 45
%#5 split
%ago 102

unknot

fitto leng 45
refine 33
close all

cyl=.001

double
Draw=f

warp install
d-torus=1
cyl=.3
pserase=1.7

torus 5 43 876
alter
refine 3
warp bbconf

Draw=t

warp along
length
about z -90

psop fancy draw 7
psop fancy fill 1 0 0
psop fancy eofill 0 1 0



 
psout fancy_fillA
 
% End of KnotPlot script

This script generates a EPS file (download below) suitable for printing on letter size paper. For printing on A4 size paper, use the command psop pagesize a4 prior to the psout command.

Download a high quality PDF or EPS file (for either letter or A4 size paper):

• fancy_fillA.pdf (122 kbytes)
• fancy_fillA_a4.pdf (122 kbytes)
• fancy_fillA.eps (238 kbytes)
• fancy_fillA_a4.eps (238 kbytes)

The PDF files and the preview image seen on this page were generated from the EPS files using Ghostscript (details in left panel on this page).