patxform.icn: Procedures to transform patterns in row form

procedure pborder:         place border around pattern
procedure pcaten:          concatenate patterns
procedure pcenter:         center pattern
procedure pcrop:           crop pattern
procedure pdisplay:        display pattern
procedure pdouble:         double pattern
procedure pflip:           flip pattern
procedure phalve:          halve pattern by bits
procedure pinvert:         invert B&W pattern
procedure pminim:          minimize pattern
procedure por:             "or" patterns
procedure protate:         rotate pattern
procedure pscramble:       scramble pattern
procedure pshift:          bit shift pattern
procedure ptrim:           trim pattern

link patxform
June 26, 2002; Ralph E. Griswold
Requires: Version 9 graphics
This file is in the public domain.

pborder(rows, l, r, t, b, c)
pcaten(rows1, rows2, dir)
pcenter(rows, w, h)
pcrop(rows, l, r, t, b)
pdisplay(rows)
pdouble(rows, dir)
pflip(rows, dir)
phalve(rows, dir, choice)
pinvert(rows)
pminim(rows)
por(rows1, rows2)
protate(rows, dir)
pscramble(rows, dir)
pshift(rows, shift, dir)
ptrim(rows, c)

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