249 lines
8.5 KiB
Python
249 lines
8.5 KiB
Python
# ***************************************************************************
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# * (c) sliptonic (shopinthewoods@gmail.com) 2014 *
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# * *
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# * This file is part of the FreeCAD CAx development system. *
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * FreeCAD is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Lesser General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with FreeCAD; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************/
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'''
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This is a postprocessor file for the Path workbench. It is used to
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take a pseudo-gcode fragment outputted by a Path object, and output
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real GCode suitable for a linuxcnc 3 axis mill. This postprocessor, once placed
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in the appropriate PathScripts folder, can be used directly from inside
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FreeCAD, via the GUI importer or via python scripts with:
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import linuxcnc_post
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linuxcnc_post.export(object,"/path/to/file.ncc")
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'''
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import datetime
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from PathScripts import PostUtils
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now = datetime.datetime.now()
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# These globals set common customization preferences
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OUTPUT_COMMENTS = True
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OUTPUT_HEADER = True
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OUTPUT_LINE_NUMBERS = False
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SHOW_EDITOR = True
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MODAL = False # if true commands are suppressed if the same as previous line.
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COMMAND_SPACE = " "
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LINENR = 100 # line number starting value
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# These globals will be reflected in the Machine configuration of the project
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UNITS = "G21" # G21 for metric, G20 for us standard
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MACHINE_NAME = "LinuxCNC"
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CORNER_MIN = {'x': 0, 'y': 0, 'z': 0}
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CORNER_MAX = {'x': 500, 'y': 300, 'z': 300}
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# Preamble text will appear at the beginning of the GCODE output file.
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PREAMBLE = '''G17 G90
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'''
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# Postamble text will appear following the last operation.
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POSTAMBLE = '''M05
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G00 X-1.0 Y1.0
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G17 G90
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M2
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'''
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# Pre operation text will be inserted before every operation
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PRE_OPERATION = ''''''
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# Post operation text will be inserted after every operation
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POST_OPERATION = ''''''
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# Tool Change commands will be inserted before a tool change
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TOOL_CHANGE = ''''''
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# to distinguish python built-in open function from the one declared below
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if open.__module__ == '__builtin__':
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pythonopen = open
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def export(objectslist, filename):
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global UNITS
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for obj in objectslist:
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if not hasattr(obj, "Path"):
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print "the object " + obj.Name + " is not a path. Please select only path and Compounds."
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return
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print "postprocessing..."
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gcode = ""
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# Find the machine.
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# The user my have overriden post processor defaults in the GUI. Make
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# sure we're using the current values in the Machine Def.
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myMachine = None
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for pathobj in objectslist:
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if hasattr(pathobj, "Group"): # We have a compound or project.
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for p in pathobj.Group:
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if p.Name == "Machine":
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myMachine = p
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if myMachine is None:
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print "No machine found in this project"
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else:
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if myMachine.MachineUnits == "Metric":
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UNITS = "G21"
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else:
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UNITS = "G20"
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# write header
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if OUTPUT_HEADER:
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gcode += linenumber() + "(Exported by FreeCAD)\n"
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gcode += linenumber() + "(Post Processor: " + __name__ + ")\n"
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gcode += linenumber() + "(Output Time:" + str(now) + ")\n"
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# Write the preamble
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if OUTPUT_COMMENTS:
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gcode += linenumber() + "(begin preamble)\n"
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for line in PREAMBLE.splitlines(True):
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gcode += linenumber() + line
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gcode += linenumber() + UNITS + "\n"
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for obj in objectslist:
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# do the pre_op
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if OUTPUT_COMMENTS:
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gcode += linenumber() + "(begin operation: " + obj.Label + ")\n"
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for line in PRE_OPERATION.splitlines(True):
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gcode += linenumber() + line
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gcode += parse(obj)
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# do the post_op
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if OUTPUT_COMMENTS:
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gcode += linenumber() + "(finish operation: " + obj.Label + ")\n"
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for line in POST_OPERATION.splitlines(True):
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gcode += linenumber() + line
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# do the post_amble
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if OUTPUT_COMMENTS:
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gcode += "(begin postamble)\n"
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for line in POSTAMBLE.splitlines(True):
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gcode += linenumber() + line
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if SHOW_EDITOR:
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dia = PostUtils.GCodeEditorDialog()
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dia.editor.setText(gcode)
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result = dia.exec_()
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if result:
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final = dia.editor.toPlainText()
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else:
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final = gcode
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else:
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final = gcode
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print "done postprocessing."
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gfile = pythonopen(filename, "wb")
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gfile.write(gcode)
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gfile.close()
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def linenumber():
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global LINENR
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if OUTPUT_LINE_NUMBERS is True:
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LINENR += 10
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return "N" + str(LINENR) + " "
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return ""
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def parse(pathobj):
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out = ""
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lastcommand = None
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# params = ['X','Y','Z','A','B','I','J','K','F','S'] #This list control
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# the order of parameters
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# linuxcnc doesn't want K properties on XY plane Arcs need work.
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params = ['X', 'Y', 'Z', 'A', 'B', 'I', 'J', 'F', 'S', 'T', 'Q', 'R', 'L']
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if hasattr(pathobj, "Group"): # We have a compound or project.
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# if OUTPUT_COMMENTS:
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# out += linenumber() + "(compound: " + pathobj.Label + ")\n"
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for p in pathobj.Group:
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out += parse(p)
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return out
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else: # parsing simple path
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# groups might contain non-path things like stock.
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if not hasattr(pathobj, "Path"):
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return out
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# if OUTPUT_COMMENTS:
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# out += linenumber() + "(" + pathobj.Label + ")\n"
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for c in pathobj.Path.Commands:
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outstring = []
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command = c.Name
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outstring.append(command)
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# if modal: only print the command if it is not the same as the
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# last one
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if MODAL is True:
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if command == lastcommand:
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outstring.pop(0)
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# Now add the remaining parameters in order
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for param in params:
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if param in c.Parameters:
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if param == 'F':
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if c.Name not in ["G0", "G00"]: #linuxcnc doesn't use rapid speeds
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outstring.append(
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param + format(c.Parameters['F'], '.2f'))
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elif param == 'T':
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outstring.append(param + str(c.Parameters['T']))
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else:
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outstring.append(
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param + format(c.Parameters[param], '.4f'))
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# store the latest command
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lastcommand = command
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# Check for Tool Change:
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if command == 'M6':
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# if OUTPUT_COMMENTS:
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# out += linenumber() + "(begin toolchange)\n"
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for line in TOOL_CHANGE.splitlines(True):
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out += linenumber() + line
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if command == "message":
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if OUTPUT_COMMENTS is False:
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out = []
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else:
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outstring.pop(0) # remove the command
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# prepend a line number and append a newline
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if len(outstring) >= 1:
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if OUTPUT_LINE_NUMBERS:
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outstring.insert(0, (linenumber()))
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# append the line to the final output
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for w in outstring:
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out += w + COMMAND_SPACE
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out = out.strip() + "\n"
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return out
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print __name__ + " gcode postprocessor loaded."
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