Creating Plots With Scripts

Postscript output in Geocap is mainly created by using the psc command. They allow VTK data, graphics primitives, text, and axis to appear in Postscript format for later output to a hardcopy device.

Main Postscript features

Conversion of all types of dataset and graphics, except gradient coloring
Flexible viewport setting on device
Axis. Parameters set by system (default) or by user
Text, where the user may specify font, size, rotation and position
Scaling to various formats
Graphics primitives such as points, lines and rectangles
Patterns
Very compact Postscript file using a compression filter

While almost any kind of plotting feature can be created using the above features in combination with the Tcl programming language, most users will eventually expect a higher level interface; this task is currently being worked on.

The three steps goes like this

Open a Postscript file
Draw something, e.g. a map and some axes
Close the postscript file

win 0 100 0 100 0 100
psc format a4
psc open c:/tmp/elephant.ps
psc on
psc vie 0.1 0.1 0.9 0.9  ;# 10% margin
psc align center  ;# Center dataset frame with resp. to viewport

psc lwf 1
psc fontsize 0.3 cm
psc axes nsew incrx 10 incry 10

# Then draw something, i.e. a map

psc off
psc close