def parse_lwpolyline(self):
     start_line = self.line_number
     points = []
     def add_point(p_array):
         # fill all "None" values with zero
         for index in range(len(p_array)):
             if p_array[index] is None:
                 if (index == 0) or (index == 1):
                     log.debug("DXFImporter: weird LWPOLYLINE input " + \
                             "date in line %d: %s" % \
                             (self.line_number, p_array))
                 p_array[index] = 0
         points.append(Point(p_array[0], p_array[1], p_array[2]))
     current_point = [None, None, None]
     key, value = self._read_key_value()
     while (not key is None) and (key != self.KEYS["MARKER"]):
         if key == self.KEYS["P1_X"]:
             axis = 0
         elif key == self.KEYS["P1_Y"]:
             axis = 1
         elif not self._color_as_height and (key == self.KEYS["P1_Z"]):
             axis = 2
         elif self._color_as_height and (key == self.KEYS["COLOR"]):
             # interpret the color as the height
             axis = 2
             value = float(value) / 255
         else:
             axis = None
         if not axis is None:
             if current_point[axis] is None:
                 # The current point definition is not complete, yet.
                 current_point[axis] = value
             else:
                 # The current point seems to be complete.
                 add_point(current_point)
                 current_point = [None, None, None]
                 current_point[axis] = value
         key, value = self._read_key_value()
     end_line = self.line_number
     # The last lines were not used - they are just the marker for the next
     # item.
     if not key is None:
         self._push_on_stack(key, value)
     # check if there is a remaining item in "current_point"
     if len(current_point) != current_point.count(None):
         add_point(current_point)
     if len(points) < 2:
         # too few points for a polyline
         log.warn("DXFImporter: Empty LWPOLYLINE definition between line " \
                 + "%d and %d" % (start_line, end_line))
     else:
         for index in range(len(points) - 1):
             point = points[index]
             next_point = points[index + 1]
             if point != next_point:
                 self.lines.append(Line(point, next_point))
             else:
                 log.warn("DXFImporter: Ignoring zero-length LINE " \
                         + "(between input line %d and %d): %s" \
                         % (start_line, end_line, point))

 def parse_arc(self, circle=False):
     start_line = self.line_number
     # the z-level defaults to zero (for 2D models)
     center = [None, None, 0]
     color = None
     radius = None
     if circle:
         angle_start = 0
         angle_end = 360
     else:
         angle_start = None
         angle_end = None
     key, value = self._read_key_value()
     while (not key is None) and (key != self.KEYS["MARKER"]):
         if key == self.KEYS["P1_X"]:
             center[0] = value
         elif key == self.KEYS["P1_Y"]:
             center[1] = value
         elif key == self.KEYS["P1_Z"]:
             center[2] = value
         elif key == self.KEYS["RADIUS"]:
             radius = value
         elif key == self.KEYS["ANGLE_START"]:
             angle_start = value
         elif key == self.KEYS["ANGLE_END"]:
             angle_end = value
         elif key == self.KEYS["COLOR"]:
             color = value
         else:
             pass
         key, value = self._read_key_value()
     end_line = self.line_number
     # The last lines were not used - they are just the marker for the next
     # item.
     if not key is None:
         self._push_on_stack(key, value)
     if (None in center) or (None in (radius, angle_start, angle_end)):
         log.warn("DXFImporter: Incomplete ARC definition between line " \
                 + "%d and %d" % (start_line, end_line))
     else:
         if self._color_as_height and (not color is None):
             # use the color code as the z coordinate
             center[2] = float(color) / 255
         center = tuple(center)
         xy_point_coords = pycam.Geometry.get_points_of_arc(center, radius, angle_start, angle_end)
         # Somehow the order of points seems to be the opposite of what is
         # expected.
         xy_point_coords.reverse()
         if len(xy_point_coords) > 1:
             for index in range(len(xy_point_coords) - 1):
                 p1 = xy_point_coords[index]
                 p1 = (p1[0], p1[1], center[2])
                 p2 = xy_point_coords[index + 1]
                 p2 = (p2[0], p2[1], center[2])
                 if p1 != p2:
                     self.lines.append(Line(p1, p2))
         else:
             log.warn("DXFImporter: Ignoring tiny ARC (between input " + \
                     "line %d and %d): %s / %s (%s - %s)" % (start_line,
                     end_line, center, radius, angle_start, angle_end))

def parse_toolpath_settings(filename):
    """ parse potential PyCAM settings from a given file

    This is mainly useful to retrieve task settings from a GCode file.
    @value filename: the name of the file to be read
    @type filename: str
    @returns: a dictionary (of all setting names and values) and the content
            of the 'comment' section (as a single string)
    @rtype: tuple(dict, str)
    """
    keywords = {}
    in_meta_zone = False
    meta_content = []
    if filename == "-":
        # read from stdin, if the input filename is "-"
        infile = sys.stdin
        close_file = False
    else:
        # open the file
        try:
            infile = pycam.Utils.URIHandler(filename).open()
        except IOError, err_msg:
            log.warn("ToolpathSettingsParser: Failed to read file (%s): %s" % \
                    (filename, err_msg))
            return None
        close_file = True

 def close_sequence(self):
     start_line = self.line_number
     if self._open_sequence == "POLYLINE":
         self.parse_polyline(False)
     else:
         log.warn("DXFImporter: unexpected SEQEND found at line %d" % \
                 start_line)

 def parse_vertex(self):
     start_line = self.line_number
     point = [None, None, 0]
     color = None
     bulge = None
     key, value = self._read_key_value()
     while (not key is None) and (key != self.KEYS["MARKER"]):
         if key == self.KEYS["P1_X"]:
             point[0] = value
         elif key == self.KEYS["P1_Y"]:
             point[1] = value
         elif key == self.KEYS["P1_Z"]:
             point[2] = value
         elif key == self.KEYS["COLOR"]:
             color = value
         elif key == self.KEYS["VERTEX_BULGE"]:
             bulge = value
         else:
             pass
         key, value = self._read_key_value()
     end_line = self.line_number
     if not key is None:
         self._push_on_stack(key, value)
     if self._color_as_height and (not color is None):
         # use the color code as the z coordinate
         point[2] = float(color) / 255
     if None in point:
         log.warn("DXFImporter: Missing attribute of VERTEX item" + \
                 "between line %d and %d" % (start_line, end_line))
     else:
         self._open_sequence_items.append(
                 (Point(point[0], point[1], point[2]), bulge))

 def parse(self, text):
     text_stream = StringIO.StringIO(text)
     config = ConfigParser.SafeConfigParser()
     config.readfp(text_stream)
     for config_dict, section in ((self.bounds, "Bounds"),
             (self.tool_settings, "Tool"),
             (self.process_settings, "Process")):
         for key, value_type in self.SECTIONS[section].items():
             value_raw = config.get(section, key, None)
             if value_raw is None:
                 continue
             elif value_type == bool:
                 value = value_raw.lower() in ("1", "true", "yes", "on")
             elif isinstance(value_type, basestring) \
                     and (value_type.startswith("list_of_")):
                 item_type = value_type[len("list_of_"):]
                 if item_type == "float":
                     item_type = float
                 else:
                     continue
                 try:
                     value = [item_type(one_val)
                             for one_val in value_raw.split(",")]
                 except ValueError:
                     log.warn("Settings: Ignored invalid setting due to " \
                             + "a failed list type parsing: " \
                             + "(%s -> %s): %s" % (section, key, value_raw))
             else:
                 try:
                     value = value_type(value_raw)
                 except ValueError:
                     log.warn("Settings: Ignored invalid setting " \
                             + "(%s -> %s): %s" % (section, key, value_raw))
             config_dict[key] = value

 def load_preferences(self):
     """ load all settings that are available in the Preferences window from
     a file in the user's home directory """
     config_filename = pycam.Gui.Settings.get_config_filename()
     if config_filename is None:
         # failed to create the personal preferences directory
         return
     config = ConfigParser.ConfigParser()
     if not config.read(config_filename):
         # no config file was read
         return
     # report any ignored (obsolete) preference keys present in the file
     for item, value in config.items("DEFAULT"):
         if not item in PREFERENCES_DEFAULTS.keys():
             log.warn("Skipping obsolete preference item: %s" % str(item))
     for item in PREFERENCES_DEFAULTS.keys():
         if not config.has_option("DEFAULT", item):
             # a new preference setting is missing in the (old) file
             continue
         value_raw = config.get("DEFAULT", item)
         old_value = self.settings.get(item)
         value_type = type(PREFERENCES_DEFAULTS[item])
         if isinstance(value_type(), basestring):
             # keep strings as they are
             value = str(value_raw)
         else:
             # parse tuples, integers, bools, ...
             value = eval(value_raw)
         self.settings.set(item, value)

 def combine_triangles(t1, t2):
     unique_vertices = []
     shared_vertices = []
     for point in t1.get_points():
         for point2 in t2.get_points():
             if point == point2:
                 shared_vertices.append(point)
                 break
         else:
             unique_vertices.append(point)
     if len(shared_vertices) != 2:
         return None
     for point in t2.get_points():
         for point2 in shared_vertices:
             if point == point2:
                 break
         else:
             unique_vertices.append(point)
     if len(unique_vertices) != 2:
         log.error("Invalid number of vertices: %s" % unique_vertices)
         return None
     if abs(unique_vertices[0].sub(unique_vertices[1]).norm - \
             shared_vertices[0].sub(shared_vertices[1]).norm) < epsilon:
         try:
             return Rectangle(unique_vertices[0], unique_vertices[1],
                     shared_vertices[0], shared_vertices[1],
                     normal=t1.normal)
         except ValueError:
             log.warn("Triangles not combined: %s, %s" % (unique_vertices,
                     shared_vertices))
             return None
     else:
         return None

def recommends_details_gtk():
    result = {}
    try:
        import gtk.gtkgl
        result["gtkgl"] = True
        result["gl"] = True
    except ImportError, err_msg:
        log.warn("Failed to import OpenGL for GTK (ImportError): %s" % \
                str(err_msg))
        result["gtkgl"] = False

def get_lines_layer(lines, z, last_z=None, step_width=None,
        milling_style=MILLING_STYLE_CONVENTIONAL):
    get_proj_point = lambda proj_point: (proj_point[0], proj_point[1], z)
    projected_lines = []
    for line in lines:
        if (not last_z is None) and (last_z < line.minz):
            # the line was processed before
            continue
        elif line.minz < z < line.maxz:
            # Split the line at the point at z level and do the calculation
            # for both point pairs.
            factor = (z - line.p1[2]) / (line.p2[2] - line.p1[2])
            plane_point = padd(line.p1, pmul(line.vector, factor))
            if line.p1[2] < z:
                p1 = get_proj_point(line.p1)
                p2 = line.p2
            else:
                p1 = line.p1
                p2 = get_proj_point(line.p2)
            projected_lines.append(Line(p1, plane_point))
            yield Line(plane_point, p2)
        elif line.minz < last_z < line.maxz:
            plane = Plane((0, 0, last_z), (0, 0, 1, 'v'))
            cp = plane.intersect_point(line.dir, line.p1)[0]
            # we can be sure that there is an intersection
            if line.p1[2] > last_z:
                p1, p2 = cp, line.p2
            else:
                p1, p2 = line.p1, cp
            projected_lines.append(Line(p1, p2))
        else:
            if line.maxz <= z:
                # the line is completely below z
                projected_lines.append(Line(get_proj_point(line.p1),
                        get_proj_point(line.p2)))
            elif line.minz >= z:
                projected_lines.append(line)
            else:
                log.warn("Unexpected condition 'get_lines_layer': " + \
                        "%s / %s / %s / %s" % (line.p1, line.p2, z, last_z))
    # process all projected lines
    for line in projected_lines:
        points = []
        if step_width is None:
            points.append(line.p1)
            points.append(line.p2)
        else:
            if isiterable(step_width):
                steps = step_width
            else:
                steps = floatrange(0.0, line.len, inc=step_width)
            for step in steps:
                next_point = padd(line.p1, pmul(line.dir, step))
                points.append(next_point)
        yield points

def get_default_model():
    """ return a filename or a Model instance """
    # try to load the default model file ("pycam" logo)
    for inputdir in EXAMPLE_MODEL_LOCATIONS:
        inputfile = os.path.join(inputdir, DEFAULT_MODEL_FILE)
        if os.path.isfile(inputfile):
            return inputfile
    else:
        # fall back to the simple test model
        log.warn("Failed to find the default model (%s) in the " \
                "following locations: %s" % (DEFAULT_MODEL_FILE,
                        ", ".join(EXAMPLE_MODEL_LOCATIONS)))
        return pycam.Importers.TestModel.get_test_model()

 def GenerateToolPathLinePush(self, pa, line, z, previous_z,
         draw_callback=None):
     if previous_z <= line.minz:
         # the line is completely above the previous level
         pass
     elif line.minz < z < line.maxz:
         # Split the line at the point at z level and do the calculation
         # for both point pairs.
         factor = (z - line.p1.z) / (line.p2.z - line.p1.z)
         plane_point = line.p1.add(line.vector.mul(factor))
         self.GenerateToolPathLinePush(pa, Line(line.p1, plane_point), z,
                 previous_z, draw_callback=draw_callback)
         self.GenerateToolPathLinePush(pa, Line(plane_point, line.p2), z,
                 previous_z, draw_callback=draw_callback)
     elif line.minz < previous_z < line.maxz:
         plane = Plane(Point(0, 0, previous_z), Vector(0, 0, 1))
         cp = plane.intersect_point(line.dir, line.p1)[0]
         # we can be sure that there is an intersection
         if line.p1.z > previous_z:
             p1, p2 = cp, line.p2
         else:
             p1, p2 = line.p1, cp
         self.GenerateToolPathLinePush(pa, Line(p1, p2), z, previous_z,
                 draw_callback=draw_callback)
     else:
         if line.maxz <= z:
             # the line is completely below z
             p1 = Point(line.p1.x, line.p1.y, z)
             p2 = Point(line.p2.x, line.p2.y, z)
         elif line.minz >= z:
             p1 = line.p1
             p2 = line.p2
         else:
             log.warn("Unexpected condition EC_GTPLP: %s / %s / %s / %s" % \
                     (line.p1, line.p2, z, previous_z))
             return
         # no model -> no possible obstacles
         # model is completely below z (e.g. support bridges) -> no obstacles
         relevant_models = [m for m in self.models if m.maxz >= z]
         if not relevant_models:
             points = [p1, p2]
         elif self.physics:
             points = get_free_paths_ode(self.physics, p1, p2)
         else:
             points = get_free_paths_triangles(relevant_models, self.cutter,
                     p1, p2)
         if points:
             for point in points:
                 pa.append(point)
             if draw_callback:
                 draw_callback(tool_position=points[-1], toolpath=pa.paths)

 def __init__(self, title, message):
     try:
         import Tkinter
     except ImportError:
         # tk is not installed
         log.warn("Failed to show error dialog due to a missing Tkinter " \
                 + "Python package.")
         return
     try:
         root = Tkinter.Tk()
     except Tkinter.TclError, err_msg:
         log.info(("Failed to create error dialog window (%s). Probably " \
                 + "you are running PyCAM from a terminal.") % err_msg)
         return

def load_model_file(filename, program_locations, unit=None):
    uri = pycam.Utils.URIHandler(filename)
    if uri.is_local():
        uri = pycam.Utils.URIHandler(os.path.expanduser(str(filename)))
    if not uri.exists():
        log.warn("The input file ('%s') was not found!" % uri)
        return None
    importer = pycam.Importers.detect_file_type(uri)[1]
    model = importer(uri, program_locations=program_locations, unit=unit)
    if not model:
        log.warn("Failed to load the model file (%s)." % uri)
        return None
    else:
        return model

 def _read_key_value(self):
     if self._input_stack:
         return self._input_stack.pop()
     try:
         line1 = self.inputstream.readline(self.MAX_CHARS_PER_LINE).strip()
         line2 = self.inputstream.readline(self.MAX_CHARS_PER_LINE).strip()
     except IOError:
         return None, None
     if not line1 and not line2:
         return None, None
     try:
         line1 = int(line1)
     except ValueError:
         log.warn("DXFImporter: Invalid key in line " \
                 + "%d (int expected): %s" % (self.line_number, line1))
         return None, None
     if line1 in [self.KEYS[key] for key in ("P1_X", "P1_Y", "P1_Z",
             "P2_X", "P2_Y", "P2_Z", "RADIUS", "ANGLE_START", "ANGLE_END",
             "TEXT_HEIGHT", "TEXT_WIDTH_FINAL", "TEXT_ROTATION",
             "TEXT_SKEW_ANGLE", "VERTEX_BULGE")]:
         try:
             line2 = float(line2)
         except ValueError:
             log.warn("DXFImporter: Invalid input in line " \
                     + "%d (float expected): %s" % (self.line_number, line2))
             line1 = None
             line2 = None
     elif line1 in [self.KEYS[key] for key in ("COLOR", "TEXT_MIRROR_FLAGS",
             "TEXT_ALIGN_HORIZONTAL", "TEXT_ALIGN_VERTICAL",
             "MTEXT_ALIGNMENT", "CURVE_TYPE", "VERTEX_FLAGS")]:
         try:
             line2 = int(line2)
         except ValueError:
             log.warn("DXFImporter: Invalid input in line " \
                     + "%d (int expected): %s" % (self.line_number, line2))
             line1 = None
             line2 = None
     elif line1 in [self.KEYS[key] for key in ("DEFAULT", "TEXT_MORE")]:
         # check the string for invalid characters
         try:
             text = unicode(line2)
         except UnicodeDecodeError:
             log.warn("DXFImporter: Invalid character in string in " + \
                     "line %d" % self.line_number)
             text_chars = []
             for char in line2:
                 try:
                     text_chars.append(unicode(char))
                 except:
                     pass
             text = u"".join(text_chars)
         line2 = _unescape_control_characters(text)
     else:
         line2 = line2.upper()
     self.line_number += 2
     return line1, line2

 def parse_line(self):
     start_line = self.line_number
     # the z-level defaults to zero (for 2D models)
     p1 = [None, None, 0]
     p2 = [None, None, 0]
     color = None
     key, value = self._read_key_value()
     while (not key is None) and (key != self.KEYS["MARKER"]):
         if key == self.KEYS["P1_X"]:
             p1[0] = value
         elif key == self.KEYS["P1_Y"]:
             p1[1] = value
         elif key == self.KEYS["P1_Z"]:
             p1[2] = value
         elif key == self.KEYS["P2_X"]:
             p2[0] = value
         elif key == self.KEYS["P2_Y"]:
             p2[1] = value
         elif key == self.KEYS["P2_Z"]:
             p2[2] = value
         elif key == self.KEYS["COLOR"]:
             color = value
         else:
             pass
         key, value = self._read_key_value()
     end_line = self.line_number
     # The last lines were not used - they are just the marker for the next
     # item.
     if not key is None:
         self._push_on_stack(key, value)
     if (None in p1) or (None in p2):
         log.warn("DXFImporter: Incomplete LINE definition between line " \
                 + "%d and %d" % (start_line, end_line))
     else:
         if self._color_as_height and (not color is None):
             # use the color code as the z coordinate
             p1[2] = float(color) / 255
             p2[2] = float(color) / 255
         line = Line(Point(p1[0], p1[1], p1[2]), Point(p2[0], p2[1], p2[2]))
         if line.p1 != line.p2:
             self.lines.append(line)
         else:
             log.warn("DXFImporter: Ignoring zero-length LINE (between " \
                     + "input line %d and %d): %s" % (start_line, end_line,
                     line))

 def save_preferences(self):
     """ save all settings that are available in the Preferences window to
     a file in the user's home directory """
     config_filename = pycam.Gui.Settings.get_config_filename()
     if config_filename is None:
         # failed to create the personal preferences directory
         log.warn("Failed to create a preferences directory in " \
                 + "your user's home directory.")
         return
     config = ConfigParser.ConfigParser()
     for item in PREFERENCES_DEFAULTS.keys():
         config.set("DEFAULT", item, self.settings.get(item))
     try:
         config_file = file(config_filename, "w")
         config.write(config_file)
         config_file.close()
     except IOError, err_msg:
         log.warn("Failed to write preferences file (%s): %s" % (config_filename, err_msg))

 def parse_content(self):
     key, value = self._read_key_value()
     while (not key is None) \
             and not ((key == self.KEYS["MARKER"]) and (value == "EOF")):
         if self.callback and self.callback():
             return
         if key == self.KEYS["MARKER"]:
             if value in ("SECTION", "TABLE", "LAYER", "ENDTAB", "ENDSEC"):
                 # we don't handle these meta-information
                 pass
             elif value == "LINE":
                 self.parse_line()
             elif value == "LWPOLYLINE":
                 self.parse_lwpolyline()
             elif value == "POLYLINE":
                 self.parse_polyline(True)
             elif value == "VERTEX":
                 self.parse_vertex()
             elif value == "SEQEND":
                 self.close_sequence()
             elif value == "ARC":
                 self.parse_arc()
             elif value == "CIRCLE":
                 self.parse_arc(circle=True)
             elif value == "TEXT":
                 self.parse_text()
             elif value == "MTEXT":
                 self.parse_mtext()
             elif value == "3DFACE":
                 self.parse_3dface()
             elif value in self.IGNORE_KEYS:
                 log.debug("DXFImporter: Ignored a blacklisted element " \
                         + "in line %d: %s" % (self.line_number, value))
             else:
                 # not supported
                 log.warn("DXFImporter: Ignored unsupported element " \
                         + "in line %d: %s" % (self.line_number, value))
         key, value = self._read_key_value()

def get_font_dir():
    if FONT_DIR_OVERRIDE:
        if os.path.isdir(FONT_DIR_OVERRIDE):
            return FONT_DIR_OVERRIDE
        else:
            log.warn(("You specified a font dir that does not exist (%s). " + "I will ignore it.") % FONT_DIR_OVERRIDE)
    font_dir = get_data_file_location(FONTS_SUBDIR, silent=True)
    if not font_dir is None:
        return font_dir
    else:
        log.warn(
            ("Failed to locate the fonts directory '%s' below '%s'. " + "Falling back to '%s'.")
            % (FONTS_SUBDIR, DATA_BASE_DIRS, ":".join(FONT_DIRS_FALLBACK))
        )
        for font_dir_fallback in FONT_DIRS_FALLBACK:
            if os.path.isdir(font_dir_fallback):
                return font_dir_fallback
        else:
            log.warn(
                ("None of the fallback font directories (%s) exist. " + "No fonts will be available.")
                % ":".join(FONT_DIRS_FALLBACK)
            )
            return None

 def parse_mtext(self):
     start_line = self.line_number
     # the z-level defaults to zero (for 2D models)
     ref_point = [None, None, 0]
     direction_vector = [None, None, None]
     color = None
     text_groups_start = []
     text_end = []
     text_height = None
     rotation = 0
     width_final = None
     font_name = "normal"
     alignment = 0
     key, value = self._read_key_value()
     while (not key is None) and (key != self.KEYS["MARKER"]):
         if key == self.KEYS["DEFAULT"]:
             text_end = value
         elif key == self.KEYS["TEXT_MORE"]:
             text_groups_start.append(value)
         elif key == self.KEYS["P1_X"]:
             ref_point[0] = value
         elif key == self.KEYS["P1_Y"]:
             ref_point[1] = value
         elif key == self.KEYS["P1_Z"]:
             ref_point[2] = value
         elif key == self.KEYS["P2_X"]:
             direction_vector[0] = value
             # according to DXF spec: the last one wins
             rotation = None
         elif key == self.KEYS["P2_Y"]:
             direction_vector[1] = value
             # according to DXF spec: the last one wins
             rotation = None
         elif key == self.KEYS["P2_Z"]:
             direction_vector[2] = value
             # according to DXF spec: the last one wins
             rotation = None
         elif key == self.KEYS["COLOR"]:
             color = value
         elif key == self.KEYS["TEXT_HEIGHT"]:
             text_height = value
         elif key == self.KEYS["TEXT_ROTATION"]:
             rotation = value
             # according to DXF spec: the last one wins
             direction_vector = [None, None, None]
         elif key == self.KEYS["TEXT_FONT"]:
             font_name = value
         elif key == self.KEYS["MTEXT_ALIGNMENT"]:
             alignment = value
         elif key == self.KEYS["TEXT_WIDTH_FINAL"]:
             width_final = value
         else:
             pass
         key, value = self._read_key_value()
     end_line = self.line_number
     # The last lines were not used - they are just the marker for the next
     # item.
     text = "".join(text_groups_start) + text_end
     if not key is None:
         self._push_on_stack(key, value)
     if None in ref_point:
         log.warn("DXFImporter: Incomplete MTEXT definition between line " \
                 + "%d and %d: missing location point" % \
                 (start_line, end_line))
     elif not text:
         log.warn("DXFImporter: Incomplete MTEXT definition between line " \
                 + "%d and %d: missing text" % (start_line, end_line))
     elif not text_height:
         log.warn("DXFImporter: Incomplete MTEXT definition between line " \
                 + "%d and %d: missing height" % (start_line, end_line))
     else:
         if self._color_as_height and (not color is None):
             # use the color code as the z coordinate
             ref_point[2] = float(color) / 255
         if self._fonts_cache:
             font = self._fonts_cache.get_font(font_name)
         else:
             font = None
         if not font:
             log.warn("DXFImporter: No fonts are available - skipping " + \
                     "MTEXT item between line %d and %d" % \
                     (start_line, end_line))
             return
         model = font.render(text)
         if (model.minx is None) or (model.miny is None) or \
                 (model.minz is None) or (model.minx == model.maxx) or \
                 (model.miny == model.maxy):
             log.warn("DXFImporter: Empty rendered MTEXT item between " + \
                     "line %d and %d" % (start_line, end_line))
             return
         model.scale(text_height / (model.maxy - model.miny),
                 callback=self.callback)
         # this setting seems to refer to a box - not the text width - ignore
         if False and width_final:
             scale_x = width_final / (model.maxx - model.minx)
             model.scale(scale_x, callback=self.callback)
         if rotation:
             matrix = pycam.Geometry.Matrix.get_rotation_matrix_axis_angle(
                     (0, 0, 1), rotation)
         elif not None in direction_vector:
#.........这里部分代码省略.........