gcode_invert_x.py

import math

def invertPath(path):
    CmdMoveRapid = ["G0", "G00"]
    CmdMoveStraight = ["G1", "G01"]
    CmdMoveCW = ["G2", "G02"]
    CmdMoveCCW = ["G3", "G03"]
    CmdDrill = ["G73", "G81", "G82", "G83"]
    CmdMoveArc = CmdMoveCW + CmdMoveCCW
    CmdMove = CmdMoveStraight + CmdMoveArc

    commands = []
    for cmd in path.Commands:
        if (
            (cmd.Name in CmdMoveRapid)
            or (cmd.Name in CmdMove)
            or (cmd.Name in CmdDrill)
        ):
            params = cmd.Parameters

            if "X" in params:
                params.update({"X": - params.get("X")});

            # Arcs need to have the I and J params rotated as well
            if cmd.Name in CmdMoveArc:
                cmd.Name = "G3" if cmd.Name in CmdMoveCW else "G2"
                if "I" in params:
                    params.update({"I": -params.get("I")});

            cmd.Parameters = params
        commands.append(cmd)
    newPath = Path.Path(commands)

    return newPath


for selected in Gui.Selection.getSelection():
    selected.Gcode = [cm.toGCode() for cm in invertPath(selected.Path).Commands]
    selected.Placement = FreeCAD.Placement()
    selected.recompute()