WYSIWYG graphics editing

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created August 7, 2009 · complexity basic · author Michael.Eriksson · version 7.0

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I recently found myself in want of a favicon. Not wanting to mess around with typical WYSIWYG editors, I wrote a Bash script that generated a PPM file based on a data matrix corresponding to the individual pixels of the eventual favicon. By applying syntax highlightning to the data matrix, I effectively had a WYSIWYG display of the eventual image within Vim.

The true favicon was a five color, 32x32 matrix, mixing the Swedish and German flags (that I indeed did some extensive editing on, trying a number of variations). The below gives a simplified version using a 7x5 Swedish flag with two colors.

Bash script

(output to be directed into a .ppm file):

#!/bin/bash -u
# basic colors from rgb.txt
k = '0 0 0'
b = '0 0 139'
g = '0 100 0'
c = '0 139 139'
r = '139 0 0'
m = '139 0 139'
y = '165 42 42'
w = '211 211 211'
K = '169 169 169'
B = '0 0 255'
G = '0 255 0'
C = '0 255 255'
R = '255 0 0'
M = '255 0 255'
Y = '255 255 0'
W = '255 255 255'

function outputLine() {
    for color in $*
    do
        eval echo "\$$color"
    done
}

# PNM header
# P1=PBM (B&W) P2=PGM (greyscale) P3=PMM (full-color) P4-P7=binary
echo 'P3'
# width / height
echo '7 5'
# color depth
echo '255'

#           The below is the colored matrix. (Could be in a separate file.)
outputLine  B B Y B B B B
outputLine  B B Y B B B B
outputLine  Y Y Y Y Y Y Y
outputLine  B B Y B B B B
outputLine  B B Y B B B B

Vim syntax script

to apply to bash scripts such as the above

if version < 600
  syntax clear
elseif exists(b:current_syntax)
  finish
endif

syn region ppmOutputline
 \ matchgroup=ppmKeyword
 \ keepend
 \ start=/^\s*outputline\>/
 \ end=/$/
 \ contains=ppmBlack,ppmDarkblue,ppmDarkgreen,ppmDarkcyan,ppmDarkred,ppmDarkmagenta,
    \ppmBrown,ppmLightgrey,ppmDarkgrey,ppmBlue,ppmGreen,ppmCyan,ppmRed,ppmMagenta,
    \ppmYellow,ppmWhite

syn match ppmBlack       /\C k/ contained
syn match ppmDarkblue    /\C b/ contained
syn match ppmDarkgreen   /\C g/ contained
syn match ppmDarkcyan    /\C c/ contained
syn match ppmDarkred     /\C r/ contained
syn match ppmDarkmagenta /\C m/ contained
syn match ppmBrown       /\C y/ contained
syn match ppmLightgrey   /\C w/ contained
syn match ppmDarkgrey    /\C K/ contained
syn match ppmBlue        /\C B/ contained
syn match ppmGreen       /\C G/ contained
syn match ppmRed         /\C R/ contained
syn match ppmMagenta     /\C M/ contained
syn match ppmYellow      /\C Y/ contained
syn match ppmWhite       /\C W/ contained

hi def ppmBlack       ctermbg=Black       ctermfg=LightGrey     guibg=black       guifg=white
hi def ppmDarkblue    ctermbg=DarkBlue    ctermfg=LightGrey     guibg=darkblue    guifg=white
hi def ppmDarkGreen   ctermbg=DarkGreen   ctermfg=LightGrey     guibg=darkgreen   guifg=white
hi def ppmDarkCyan    ctermbg=DarkCyan    ctermfg=LightGrey     guibg=darkcyan    guifg=white
hi def ppmDarkRed     ctermbg=DarkRed     ctermfg=LightGrey     guibg=darkred     guifg=white
hi def ppmDarkmagenta ctermbg=DarkMagenta ctermfg=LightGrey     guibg=darkmagenta guifg=white
hi def ppmBrown       ctermbg=Brown       ctermfg=LightGrey     guibg=brown       guifg=white
hi def ppmLightgrey   ctermbg=LightGrey   ctermfg=Black         guibg=lightgrey   guifg=black
hi def ppmDarkgrey    ctermbg=DarkGrey    ctermfg=White         guibg=darkgrey    guifg=white
hi def ppmBlue        ctermbg=Blue        ctermfg=White         guibg=blue        guifg=white
hi def ppmCyan        ctermbg=Cyan        ctermfg=DarkGrey      guibg=cyan        guifg=white
hi def ppmRed         ctermbg=Red         ctermfg=White         guibg=red         guifg=black
hi def ppmMagenta     ctermbg=Magenta     ctermfg=White         guibg=magenta     guifg=black
hi def ppmYellow      ctermbg=Yellow      ctermfg=DarkGrey      guibg=yellow      guifg=black
hi def ppmWhite       ctermbg=White       ctermfg=DarkGrey      guibg=white       guifg=black

hi def link ppmKeyword Keyword

A much larger write-up with the full examples and some screen-shots is available. (I hope that the size justifies the external link.) The above should suffice to reproduce everything, however.

See also

• Netpbm (Wikipedia)
• Netpbm format (Wikipedia)

Comments

TODO:

• Include "sh" syntax for lines other than "outputline"
• Foreground: same as bg (for solid colors) or distinct from bg (to facilitate editing)?

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Due to my editing, this "tip" has become a "software package" with a bash script and a Vim syntax script. Maybe move to a subpage? --Tonymec 07:37, 27 August 2009 (UTC)