diff options
Diffstat (limited to 'renderer/support/pogojig/inkscape/simplepath.py')
| -rw-r--r-- | renderer/support/pogojig/inkscape/simplepath.py | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/renderer/support/pogojig/inkscape/simplepath.py b/renderer/support/pogojig/inkscape/simplepath.py new file mode 100644 index 0000000..8d4f0a7 --- /dev/null +++ b/renderer/support/pogojig/inkscape/simplepath.py @@ -0,0 +1,213 @@ +#!/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 ValueError('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 = next(lexer) + except StopIteration: + break + params = [] + needParam = True + if isCommand: + if not lastCommand and token.upper() != 'M': + raise ValueError('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 ValueError('Invalid path, no initial command.') + numParams = pathdefs[command.upper()][1] + while numParams > 0: + if needParam: + try: + token, isCommand = next(lexer) + if isCommand: + raise ValueError('Invalid number of parameters') + except StopIteration: + raise ValueError('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 + + +# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99 |