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Resize SVG images
from decimal import Decimal
from xml.dom import minidom
import sys
import os
import re
import simplejson as json
import string
import tornado.options
import logging
"""
convert a path from one with absolute coordinates to one with relative coordinates
svg spec http://www.w3.org/TR/2003/REC-SVG11-20030114/paths.html
"""
def scale(svg, scale_factor, float_format="%0.2f"):
scale_factor = Decimal(scale_factor)
path = svg.split(' ')
out = []
o = tornado.options.options
for entry in path:
if entry in string.lowercase + string.uppercase:
out.append(entry)
else:
out.append(float_format % (Decimal(entry) * scale_factor))
if o.offset_x is not None:
assert out[0] in ['M', 'm']
out[1] = float_format % (Decimal(out[1]) + Decimal(str(o.offset_x)))
if o.offset_y is not None:
assert out[0] in ['M', 'm']
out[2] = float_format % (Decimal(out[2]) + Decimal(str(o.offset_y)))
return ' '.join(out)
def abs_svg_to_relative_svg(source_path, float_format="%0.2f"):
path = source_path.replace(',', ' ')
for character in string.lowercase + string.uppercase:
path = path.replace(character, ' %s ' % character)
temp_path = re.sub('\s+', ' ', path).split('-')
path = ' -'.join(temp_path).split(' ')
path = [x for x in path if x]
logging.debug(path)
out_path = []
max_x = Decimal('0')
min_x = Decimal('1000')
min_y = Decimal('0')
max_y = Decimal('1000')
X,Y=Decimal("0"),Decimal("0")
while True:
try:
e = path.pop(0)
except:
break
if e in ['z','Z']:
out_path.append(e)
continue
if e in ['l','m']:
out_path.append(e)
x,y = (path.pop(0), path.pop(0))
out_path.append(x)
out_path.append(y)
X += Decimal(x)
Y += Decimal(y)
max_x = max(max_x, X)
min_x = min(min_x, X)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
continue
if e in ['h']:
x = path.pop(0)
X += Decimal(x)
max_x = max(max_x, X)
min_x = min(min_x, X)
out_path.append(e)
out_path.append(x)
continue
if e in ['H']:
x = Decimal(path.pop(0))
xd = x - X
X = x
max_x = max(max_x, X)
min_x = min(min_x, X)
out_path.append(e.lower())
out_path.append(float_format % xd)
continue
if e in ['v']:
y = path.pop(0)
Y += Decimal(y)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
out_path.append(e)
out_path.append(y)
continue
if e in ['V']:
y = Decimal(path.pop(0))
yd = y - Y
Y = y
max_y = max(max_y, Y)
min_y = min(min_y, Y)
out_path.append(e.lower())
out_path.append(float_format % yd)
continue
if e in ['c']:
out_path.append(e)
while path and path[0] not in string.lowercase + string.uppercase:
srcd = [path.pop(0) for x in range(6)]
x1, y1, x2, y2, x, y = srcd
X += Decimal(x)
Y += Decimal(y)
max_x = max(max_x, X)
min_x = min(min_x, X)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
out_path += srcd
continue
if e in ['s']:
out_path.append(e.lower())
while path and path[0] not in string.lowercase + string.uppercase:
srcd = [path.pop(0) for x in range(4)]
x1, y1, x, y = srcd
X += Decimal(x)
Y += Decimal(y)
max_x = max(max_x, X)
min_x = min(min_x, X)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
out_path += srcd
continue
if e in ['S']:
# curve
out_path.append(e.lower())
while path and path[0] not in string.lowercase + string.uppercase:
srcd = [Decimal(path.pop(0)) for x in range(4)]
x1, y1, x, y = srcd
# if X == None and Y == None:
# X = Decimal('0')
# Y = Decimal('0')
x1d = x1 - X
y1d = y1 - Y
xd = x - X
yd = y - Y
X = x
Y = y
max_x = max(max_x, X)
min_x = min(min_x, X)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
logging.debug(srcd)
out_path += [float_format % z for z in [x1d, y1d, xd, yd]]
continue
if e in ['C']:
# curve
out_path.append(e.lower())
while path and path[0] not in string.lowercase + string.uppercase:
logging.debug(e, X, Y)
srcd = [Decimal(path.pop(0)) for x in range(6)]
x1, y1, x2, y2, x, y = srcd
# if X == None and Y == None:
# X = Decimal('0')
# Y = Decimal('0')
x1d = x1 - X
y1d = y1 - Y
x2d = x2 - X
y2d = y2 - Y
xd = x - X
yd = y - Y
X = x
Y = y
max_x = max(max_x, X)
min_x = min(min_x, X)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
logging.debug(srcd)
logging.debug('\t', [float_format % z for z in [x1d, y1d, x2d, y2d, xd, yd]])
out_path += [float_format % z for z in [x1d, y1d, x2d, y2d, xd, yd]]
continue
if e in ['L','M']:
logging.debug(e, X, Y)
x,y = (path.pop(0), path.pop(0))
if X == None and Y == None:
out_path.append(e)
out_path.append(x)
out_path.append(y)
X = Decimal(x)
Y = Decimal(y)
max_x = max(max_x, X)
min_x = min(min_x, X)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
continue
x = Decimal(x)
y = Decimal(y)
xd = x - X
yd = y - Y
X = x
Y = y
max_x = max(max_x, X)
min_x = min(min_x, X)
max_y = max(max_y, Y)
min_y = min(min_y, Y)
logging.debug('\t',x,y)
logging.debug('\t',xd,yd)
out_path.append(e.lower())
out_path.append(float_format % xd)
out_path.append(float_format % yd)
continue
raise Exception("error, %r not handled" % e)
extra = dict(
max_x = float_format % max_x,
min_x = float_format % min_x,
max_y = float_format % max_y,
min_y = float_format % min_y,
)
return (' '.join(out_path), extra)
if __name__ == "__main__":
tornado.options.define('input_file', type=str)
tornado.options.define('scale', type=float, default=None)
tornado.options.define("offset_x", type=float, default=None)
tornado.options.define("offset_y", type=float, default=None)
tornado.options.define("precision", type=str, default="%0.2f")
tornado.options.parse_command_line()
o = tornado.options.options
if o.input_file.endswith('.svg'):
tree = minidom.parseString(open(o.input_file, 'rb').read())
logging.debug(tree)
paths = []
min_x_l = []
max_x_l = []
for path in tree.getElementsByTagName('path'):
path_str = path.attributes['d'].value
logging.debug("%s %s", path, path_str)
svg, extra = abs_svg_to_relative_svg(path_str, float_format=o.precision)
logging.info('%r', extra)
min_x_l.append(extra['min_x'])
max_x_l.append(extra['max_x'])
if o.scale is not None:
svg = scale(svg, o.scale, float_format=o.precision)
paths.append(svg)
print json.dumps(paths)
print "(before scale) min_x", min(min_x_l), "max_x", max(max_x_l)
sys.exit(0)
if o.input_file == "-":
svg, extra= abs_svg_to_relative_svg(sys.stdin.read())
if o.scale is not None:
svg = scale(svg, o.scale)
print extra
print svg
sys.exit(0)
if os.path.exists(sys.argv[-1]):
data = open(sys.argv[-1], 'r').read()
data = json.loads(data)
translated = []
for key, svg in data.items():
svg, width, kern = abs_svg_to_relative_svg(svg)
svg = scale(svg, '.13')
width = '%0.2f' % (Decimal(width) * Decimal('.13'))
kern = '%0.2f' % (Decimal(kern) * Decimal('.13'))
translated.append((key, {"path":svg, "width": width, "kern":kern}))
out = open(sys.argv[-2], 'w')
out.write(json.dumps(dict(translated)))
out.close
else:
print abs_svg_to_relative_svg(sys.argv[-1])
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