/usr/share/octave/packages/geometry-1.7.0/io/private/simplepath.py is in octave-geometry 1.7.0-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 | #!/usr/bin/env python
"""
simplepath.py
functions for digesting paths into a simple list structure
Copyright (C) 2005 Aaron Spike, aaron@ekips.org
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
import re, math
def lexPath(d):
"""
returns and iterator that breaks path data
identifies command and parameter tokens
"""
offset = 0
length = len(d)
delim = re.compile(r'[ \t\r\n,]+')
command = re.compile(r'[MLHVCSQTAZmlhvcsqtaz]')
parameter = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
while 1:
m = delim.match(d, offset)
if m:
offset = m.end()
if offset >= length:
break
m = command.match(d, offset)
if m:
yield [d[offset:m.end()], True]
offset = m.end()
continue
m = parameter.match(d, offset)
if m:
yield [d[offset:m.end()], False]
offset = m.end()
continue
#TODO: create new exception
raise Exception, 'Invalid path data!'
'''
pathdefs = {commandfamily:
[
implicitnext,
#params,
[casts,cast,cast],
[coord type,x,y,0]
]}
'''
pathdefs = {
'M':['L', 2, [float, float], ['x','y']],
'L':['L', 2, [float, float], ['x','y']],
'H':['H', 1, [float], ['x']],
'V':['V', 1, [float], ['y']],
'C':['C', 6, [float, float, float, float, float, float], ['x','y','x','y','x','y']],
'S':['S', 4, [float, float, float, float], ['x','y','x','y']],
'Q':['Q', 4, [float, float, float, float], ['x','y','x','y']],
'T':['T', 2, [float, float], ['x','y']],
'A':['A', 7, [float, float, float, int, int, float, float], ['r','r','a',0,'s','x','y']],
'Z':['L', 0, [], []]
}
def parsePath(d):
"""
Parse SVG path and return an array of segments.
Removes all shorthand notation.
Converts coordinates to absolute.
"""
retval = []
lexer = lexPath(d)
pen = (0.0,0.0)
subPathStart = pen
lastControl = pen
lastCommand = ''
while 1:
try:
token, isCommand = lexer.next()
except StopIteration:
break
params = []
needParam = True
if isCommand:
if not lastCommand and token.upper() != 'M':
raise Exception, 'Invalid path, must begin with moveto.'
else:
command = token
else:
#command was omited
#use last command's implicit next command
needParam = False
if lastCommand:
if lastCommand.isupper():
command = pathdefs[lastCommand][0]
else:
command = pathdefs[lastCommand.upper()][0].lower()
else:
raise Exception, 'Invalid path, no initial command.'
numParams = pathdefs[command.upper()][1]
while numParams > 0:
if needParam:
try:
token, isCommand = lexer.next()
if isCommand:
raise Exception, 'Invalid number of parameters'
except StopIteration:
raise Exception, 'Unexpected end of path'
cast = pathdefs[command.upper()][2][-numParams]
param = cast(token)
if command.islower():
if pathdefs[command.upper()][3][-numParams]=='x':
param += pen[0]
elif pathdefs[command.upper()][3][-numParams]=='y':
param += pen[1]
params.append(param)
needParam = True
numParams -= 1
#segment is now absolute so
outputCommand = command.upper()
#Flesh out shortcut notation
if outputCommand in ('H','V'):
if outputCommand == 'H':
params.append(pen[1])
if outputCommand == 'V':
params.insert(0,pen[0])
outputCommand = 'L'
if outputCommand in ('S','T'):
params.insert(0,pen[1]+(pen[1]-lastControl[1]))
params.insert(0,pen[0]+(pen[0]-lastControl[0]))
if outputCommand == 'S':
outputCommand = 'C'
if outputCommand == 'T':
outputCommand = 'Q'
#current values become "last" values
if outputCommand == 'M':
subPathStart = tuple(params[0:2])
pen = subPathStart
if outputCommand == 'Z':
pen = subPathStart
else:
pen = tuple(params[-2:])
if outputCommand in ('Q','C'):
lastControl = tuple(params[-4:-2])
else:
lastControl = pen
lastCommand = command
retval.append([outputCommand,params])
return retval
def formatPath(a):
"""Format SVG path data from an array"""
return "".join([cmd + " ".join([str(p) for p in params]) for cmd, params in a])
def translatePath(p, x, y):
for cmd,params in p:
defs = pathdefs[cmd]
for i in range(defs[1]):
if defs[3][i] == 'x':
params[i] += x
elif defs[3][i] == 'y':
params[i] += y
def scalePath(p, x, y):
for cmd,params in p:
defs = pathdefs[cmd]
for i in range(defs[1]):
if defs[3][i] == 'x':
params[i] *= x
elif defs[3][i] == 'y':
params[i] *= y
elif defs[3][i] == 'r': # radius parameter
params[i] *= x
elif defs[3][i] == 's': # sweep-flag parameter
if x*y < 0:
params[i] = 1 - params[i]
elif defs[3][i] == 'a': # x-axis-rotation angle
if y < 0:
params[i] = - params[i]
def rotatePath(p, a, cx = 0, cy = 0):
if a == 0:
return p
for cmd,params in p:
defs = pathdefs[cmd]
for i in range(defs[1]):
if defs[3][i] == 'x':
x = params[i] - cx
y = params[i + 1] - cy
r = math.sqrt((x**2) + (y**2))
if r != 0:
theta = math.atan2(y, x) + a
params[i] = (r * math.cos(theta)) + cx
params[i + 1] = (r * math.sin(theta)) + cy
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