Utilities for screwing about with point streams:

Feed a set of points (not lines or rectangles!!! (yet)) through these
scripts to change them.

Stretch:
Usage: cat MyListOfPoints.txt | stretch x | drawtool
       where, x is a multiplier to apply to each x and y coordinate

Swap:
Usage: cat MyOtherListOfPoints.txt | swap | drawtool
       which will swap all of the x,y coordinates round.


I know that these are useless, but the demonstrate the possibility of what
could be done with a bit of clever scripting piped into drawtool.

Ideas for other filters:
Colour filters, to add a tint to a picture?
Mappings, bump/spherical mapping of pictures?
Vectorisers, filters to convert point streams into lines and rectangles (or
vice versa)
