printrun-src/printrun/svg2gcode/simplepath.py

Fri, 28 Jul 2017 15:57:22 +0200

author
mdd
date
Fri, 28 Jul 2017 15:57:22 +0200
changeset 29
c96f20e95029
parent 16
36d478bde840
permissions
-rw-r--r--

Changed min/max setting values

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

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