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#!/usr/bin/env python3
"""
Convert file ZEICHENSATZ from graphics package to PNG files
"""
from eumel import *
class ZeichensatzDataspace(Dataspace):
TYPE = 0x44c
def __init__ (self, fd):
Dataspace.__init__ (self, fd)
# just an array with 255 elements
self.rows = []
for i in range (255):
self.rows.append (self.parseText ())
self.parseHeap ()
if __name__ == '__main__':
import argparse, sys, cairo, math
def transform (w, h, x, y):
return ((2+x), (11-y))
parser = argparse.ArgumentParser(description='Convert ZEICHENSATZ dataspace to PNG')
parser.add_argument ('-v', '--verbose', help='Enable debugging messages', action='store_true')
parser.add_argument ('file', help='Input file')
parser.add_argument ('prefix', help='Output prefix')
args = parser.parse_args ()
if args.verbose:
logging.basicConfig (level=logging.DEBUG)
else:
logging.basicConfig (level=logging.WARNING)
m = []
with open (args.file, 'rb') as fd:
ds = ZeichensatzDataspace (fd)
# no character with code 0
for (j, r) in zip (range (1, len (ds.rows)+1), ds.rows):
if len (r) == 0:
continue
out = '{}{:03d}.png'.format (args.prefix, j)
logging.info ('Converting character {} to {}'.format (j, out))
w, h = 1024, 1024
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h)
ctx = cairo.Context(surface)
ctx.scale (64, 64)
ctx.set_line_width (0.1)
ctx.set_source_rgb (1, 0, 0)
r = bytes (r)
lastxy = (0, 0)
for i in range (0, len (r), 4):
x0, y0, x1, y1 = struct.unpack ('<bbbb', r[i:i+4])
m.extend ([x0, y0, x1, y1])
if (x0, y0) != lastxy:
ctx.move_to (*transform (w, h, x0, y0))
if (x0, y0) != (x1, y1):
ctx.line_to (*transform (w, h, x1, y1))
else:
x1, y1 = transform (w, h, x1, y1)
ctx.arc (x1, y1, 0.1, 0, 2*math.pi)
lastxy = (x1, y1)
ctx.stroke ()
surface.write_to_png (out)
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