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+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
+# Modified from parser.py by Paulo Henrique Silva <ph.silva@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+""" This module provides an RS-274-X class and parser.
+"""
+
+import copy
+import json
+import os
+import re
+import sys
+
+try:
+ from cStringIO import StringIO
+except(ImportError):
+ from io import StringIO
+
+from .gerber_statements import *
+from .primitives import *
+from .cam import CamFile, FileSettings
+from .utils import sq_distance
+
+
+def read(filename):
+ """ Read data from filename and return a GerberFile
+
+ Parameters
+ ----------
+ filename : string
+ Filename of file to parse
+
+ Returns
+ -------
+ file : :class:`gerber.rs274x.GerberFile`
+ A GerberFile created from the specified file.
+ """
+ return GerberParser().parse(filename)
+
+
+def loads(data, filename=None):
+ """ Generate a GerberFile object from rs274x data in memory
+
+ Parameters
+ ----------
+ data : string
+ string containing gerber file contents
+
+ filename : string, optional
+ string containing the filename of the data source
+
+ Returns
+ -------
+ file : :class:`gerber.rs274x.GerberFile`
+ A GerberFile created from the specified file.
+ """
+ return GerberParser().parse_raw(data, filename)
+
+
+class GerberFile(CamFile):
+ """ A class representing a single gerber file
+
+ The GerberFile class represents a single gerber file.
+
+ Parameters
+ ----------
+ statements : list
+ list of gerber file statements
+
+ settings : dict
+ Dictionary of gerber file settings
+
+ filename : string
+ Filename of the source gerber file
+
+ Attributes
+ ----------
+ comments: list of strings
+ List of comments contained in the gerber file.
+
+ size : tuple, (<float>, <float>)
+ Size in [self.units] of the layer described by the gerber file.
+
+ bounds: tuple, ((<float>, <float>), (<float>, <float>))
+ boundaries of the layer described by the gerber file.
+ `bounds` is stored as ((min x, max x), (min y, max y))
+
+ """
+
+ def __init__(self, statements, settings, primitives, apertures, filename=None):
+ super(GerberFile, self).__init__(statements, settings, primitives, filename)
+
+ self.apertures = apertures
+
+ @property
+ def comments(self):
+ return [comment.comment for comment in self.statements
+ if isinstance(comment, CommentStmt)]
+
+ @property
+ def size(self):
+ xbounds, ybounds = self.bounds
+ return (xbounds[1] - xbounds[0], ybounds[1] - ybounds[0])
+
+ @property
+ def bounds(self):
+ min_x = min_y = 1000000
+ max_x = max_y = -1000000
+
+ for stmt in [stmt for stmt in self.statements if isinstance(stmt, CoordStmt)]:
+ if stmt.x is not None:
+ min_x = min(stmt.x, min_x)
+ max_x = max(stmt.x, max_x)
+
+ if stmt.y is not None:
+ min_y = min(stmt.y, min_y)
+ max_y = max(stmt.y, max_y)
+
+ return ((min_x, max_x), (min_y, max_y))
+
+ @property
+ def bounding_box(self):
+ min_x = min_y = 1000000
+ max_x = max_y = -1000000
+
+ for prim in self.primitives:
+ bounds = prim.bounding_box
+ min_x = min(bounds[0][0], min_x)
+ max_x = max(bounds[0][1], max_x)
+
+ min_y = min(bounds[1][0], min_y)
+ max_y = max(bounds[1][1], max_y)
+
+ return ((min_x, max_x), (min_y, max_y))
+
+ def write(self, filename, settings=None):
+ """ Write data out to a gerber file.
+ """
+ with open(filename, 'w') as f:
+ for statement in self.statements:
+ f.write(statement.to_gerber(settings or self.settings))
+ f.write("\n")
+
+ def to_inch(self):
+ if self.units != 'inch':
+ self.units = 'inch'
+ for statement in self.statements:
+ statement.to_inch()
+ for primitive in self.primitives:
+ primitive.to_inch()
+
+ def to_metric(self):
+ if self.units != 'metric':
+ self.units = 'metric'
+ for statement in self.statements:
+ statement.to_metric()
+ for primitive in self.primitives:
+ primitive.to_metric()
+
+ def offset(self, x_offset=0, y_offset=0):
+ for statement in self.statements:
+ statement.offset(x_offset, y_offset)
+ for primitive in self.primitives:
+ primitive.offset(x_offset, y_offset)
+
+
+class GerberParser(object):
+ """ GerberParser
+ """
+ NUMBER = r"[\+-]?\d+"
+ DECIMAL = r"[\+-]?\d+([.]?\d+)?"
+ STRING = r"[a-zA-Z0-9_+\-/!?<>”’(){}.\|&@# :]+"
+ NAME = r"[a-zA-Z_$\.][a-zA-Z_$\.0-9+\-]+"
+
+ FS = r"(?P<param>FS)(?P<zero>(L|T|D))?(?P<notation>(A|I))[NG0-9]*X(?P<x>[0-7][0-7])Y(?P<y>[0-7][0-7])[DM0-9]*"
+ MO = r"(?P<param>MO)(?P<mo>(MM|IN))"
+ LP = r"(?P<param>LP)(?P<lp>(D|C))"
+ AD_CIRCLE = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>C)[,]?(?P<modifiers>[^,%]*)"
+ AD_RECT = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>R)[,](?P<modifiers>[^,%]*)"
+ AD_OBROUND = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>O)[,](?P<modifiers>[^,%]*)"
+ AD_POLY = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>P)[,](?P<modifiers>[^,%]*)"
+ AD_MACRO = r"(?P<param>AD)D(?P<d>\d+)(?P<shape>{name})[,]?(?P<modifiers>[^,%]*)".format(name=NAME)
+ AM = r"(?P<param>AM)(?P<name>{name})\*(?P<macro>[^%]*)".format(name=NAME)
+ # Include File
+ IF = r"(?P<param>IF)(?P<filename>.*)"
+
+
+ # begin deprecated
+ AS = r"(?P<param>AS)(?P<mode>(AXBY)|(AYBX))"
+ IN = r"(?P<param>IN)(?P<name>.*)"
+ IP = r"(?P<param>IP)(?P<ip>(POS|NEG))"
+ IR = r"(?P<param>IR)(?P<angle>{number})".format(number=NUMBER)
+ MI = r"(?P<param>MI)(A(?P<a>0|1))?(B(?P<b>0|1))?"
+ OF = r"(?P<param>OF)(A(?P<a>{decimal}))?(B(?P<b>{decimal}))?".format(decimal=DECIMAL)
+ SF = r"(?P<param>SF)(?P<discarded>.*)"
+ LN = r"(?P<param>LN)(?P<name>.*)"
+ DEPRECATED_UNIT = re.compile(r'(?P<mode>G7[01])\*')
+ DEPRECATED_FORMAT = re.compile(r'(?P<format>G9[01])\*')
+ # end deprecated
+
+ PARAMS = (FS, MO, LP, AD_CIRCLE, AD_RECT, AD_OBROUND, AD_POLY,
+ AD_MACRO, AM, AS, IF, IN, IP, IR, MI, OF, SF, LN)
+
+ PARAM_STMT = [re.compile(r"%?{0}\*%?".format(p)) for p in PARAMS]
+
+ COORD_FUNCTION = r"G0?[123]"
+ COORD_OP = r"D0?[123]"
+
+ COORD_STMT = re.compile((
+ r"(?P<function>{function})?"
+ r"(X(?P<x>{number}))?(Y(?P<y>{number}))?"
+ r"(I(?P<i>{number}))?(J(?P<j>{number}))?"
+ r"(?P<op>{op})?\*".format(number=NUMBER, function=COORD_FUNCTION, op=COORD_OP)))
+
+ APERTURE_STMT = re.compile(r"(?P<deprecated>(G54)|(G55))?D(?P<d>\d+)\*")
+
+ COMMENT_STMT = re.compile(r"G0?4(?P<comment>[^*]*)(\*)?")
+
+ EOF_STMT = re.compile(r"(?P<eof>M[0]?[012])\*")
+
+ REGION_MODE_STMT = re.compile(r'(?P<mode>G3[67])\*')
+ QUAD_MODE_STMT = re.compile(r'(?P<mode>G7[45])\*')
+
+ # Keep include loop from crashing us
+ INCLUDE_FILE_RECURSION_LIMIT = 10
+
+ def __init__(self):
+ self.filename = None
+ self.settings = FileSettings()
+ self.statements = []
+ self.primitives = []
+ self.apertures = {}
+ self.macros = {}
+ self.current_region = None
+ self.x = 0
+ self.y = 0
+ self.op = "D02"
+ self.aperture = 0
+ self.interpolation = 'linear'
+ self.direction = 'clockwise'
+ self.image_polarity = 'positive'
+ self.level_polarity = 'dark'
+ self.region_mode = 'off'
+ self.quadrant_mode = 'multi-quadrant'
+ self.step_and_repeat = (1, 1, 0, 0)
+ self._recursion_depth = 0
+
+ def parse(self, filename):
+ self.filename = filename
+ with open(filename, "rU") as fp:
+ data = fp.read()
+ return self.parse_raw(data, filename)
+
+ def parse_raw(self, data, filename=None):
+ self.filename = filename
+ for stmt in self._parse(self._split_commands(data)):
+ self.evaluate(stmt)
+ self.statements.append(stmt)
+
+ # Initialize statement units
+ for stmt in self.statements:
+ stmt.units = self.settings.units
+
+ return GerberFile(self.statements, self.settings, self.primitives, self.apertures.values(), filename)
+
+ def _split_commands(self, data):
+ """
+ Split the data into commands. Commands end with * (and also newline to help with some badly formatted files)
+ """
+
+ length = len(data)
+ start = 0
+ in_header = True
+
+ for cur in range(0, length):
+
+ val = data[cur]
+
+ if val == '%' and start == cur:
+ in_header = True
+ continue
+
+ if val == '\r' or val == '\n':
+ if start != cur:
+ yield data[start:cur]
+ start = cur + 1
+
+ elif not in_header and val == '*':
+ yield data[start:cur + 1]
+ start = cur + 1
+
+ elif in_header and val == '%':
+ yield data[start:cur + 1]
+ start = cur + 1
+ in_header = False
+
+ def dump_json(self):
+ stmts = {"statements": [stmt.__dict__ for stmt in self.statements]}
+ return json.dumps(stmts)
+
+ def dump_str(self):
+ string = ""
+ for stmt in self.statements:
+ string += str(stmt) + "\n"
+ return string
+
+ def _parse(self, data):
+ oldline = ''
+
+ for line in data:
+ line = oldline + line.strip()
+
+ # skip empty lines
+ if not len(line):
+ continue
+
+ # deal with multi-line parameters
+ if line.startswith("%") and not line.endswith("%") and not "%" in line[1:]:
+ oldline = line
+ continue
+
+ did_something = True # make sure we do at least one loop
+ while did_something and len(line) > 0:
+ did_something = False
+
+ # consume empty data blocks
+ if line[0] == '*':
+ line = line[1:]
+ did_something = True
+ continue
+
+ # coord
+ (coord, r) = _match_one(self.COORD_STMT, line)
+ if coord:
+ yield CoordStmt.from_dict(coord, self.settings)
+ line = r
+ did_something = True
+ continue
+
+ # aperture selection
+ (aperture, r) = _match_one(self.APERTURE_STMT, line)
+ if aperture:
+ yield ApertureStmt(**aperture)
+ did_something = True
+ line = r
+ continue
+
+ # parameter
+ (param, r) = _match_one_from_many(self.PARAM_STMT, line)
+
+ if param:
+ if param["param"] == "FS":
+ stmt = FSParamStmt.from_dict(param)
+ self.settings.zero_suppression = stmt.zero_suppression
+ self.settings.format = stmt.format
+ self.settings.notation = stmt.notation
+ yield stmt
+ elif param["param"] == "MO":
+ stmt = MOParamStmt.from_dict(param)
+ self.settings.units = stmt.mode
+ yield stmt
+ elif param["param"] == "LP":
+ yield LPParamStmt.from_dict(param)
+ elif param["param"] == "AD":
+ yield ADParamStmt.from_dict(param)
+ elif param["param"] == "AM":
+ stmt = AMParamStmt.from_dict(param)
+ stmt.units = self.settings.units
+ yield stmt
+ elif param["param"] == "OF":
+ yield OFParamStmt.from_dict(param)
+ elif param["param"] == "IF":
+ # Don't crash on include loop
+ if self._recursion_depth < self.INCLUDE_FILE_RECURSION_LIMIT:
+ self._recursion_depth += 1
+ with open(os.path.join(os.path.dirname(self.filename), param["filename"]), 'r') as f:
+ inc_data = f.read()
+ for stmt in self._parse(self._split_commands(inc_data)):
+ yield stmt
+ self._recursion_depth -= 1
+ else:
+ raise IOError("Include file nesting depth limit exceeded.")
+ elif param["param"] == "IN":
+ yield INParamStmt.from_dict(param)
+ elif param["param"] == "LN":
+ yield LNParamStmt.from_dict(param)
+ # deprecated commands AS, IN, IP, IR, MI, OF, SF, LN
+ elif param["param"] == "AS":
+ yield ASParamStmt.from_dict(param)
+ elif param["param"] == "IN":
+ yield INParamStmt.from_dict(param)
+ elif param["param"] == "IP":
+ yield IPParamStmt.from_dict(param)
+ elif param["param"] == "IR":
+ yield IRParamStmt.from_dict(param)
+ elif param["param"] == "MI":
+ yield MIParamStmt.from_dict(param)
+ elif param["param"] == "OF":
+ yield OFParamStmt.from_dict(param)
+ elif param["param"] == "SF":
+ yield SFParamStmt.from_dict(param)
+ elif param["param"] == "LN":
+ yield LNParamStmt.from_dict(param)
+ else:
+ yield UnknownStmt(line)
+
+ did_something = True
+ line = r
+ continue
+
+ # Region Mode
+ (mode, r) = _match_one(self.REGION_MODE_STMT, line)
+ if mode:
+ yield RegionModeStmt.from_gerber(line)
+ line = r
+ did_something = True
+ continue
+
+ # Quadrant Mode
+ (mode, r) = _match_one(self.QUAD_MODE_STMT, line)
+ if mode:
+ yield QuadrantModeStmt.from_gerber(line)
+ line = r
+ did_something = True
+ continue
+
+ # comment
+ (comment, r) = _match_one(self.COMMENT_STMT, line)
+ if comment:
+ yield CommentStmt(comment["comment"])
+ did_something = True
+ line = r
+ continue
+
+ # deprecated codes
+ (deprecated_unit, r) = _match_one(self.DEPRECATED_UNIT, line)
+ if deprecated_unit:
+ stmt = MOParamStmt(param="MO", mo="inch" if "G70" in
+ deprecated_unit["mode"] else "metric")
+ self.settings.units = stmt.mode
+ yield stmt
+ line = r
+ did_something = True
+ continue
+
+ (deprecated_format, r) = _match_one(self.DEPRECATED_FORMAT, line)
+ if deprecated_format:
+ yield DeprecatedStmt.from_gerber(line)
+ line = r
+ did_something = True
+ continue
+
+ # eof
+ (eof, r) = _match_one(self.EOF_STMT, line)
+ if eof:
+ yield EofStmt()
+ did_something = True
+ line = r
+ continue
+
+ if line.find('*') > 0:
+ yield UnknownStmt(line)
+ did_something = True
+ line = ""
+ continue
+
+ oldline = line
+
+ def evaluate(self, stmt):
+ """ Evaluate Gerber statement and update image accordingly.
+
+ This method is called once for each statement in the file as it
+ is parsed.
+
+ Parameters
+ ----------
+ statement : Statement
+ Gerber/Excellon statement to evaluate.
+
+ """
+ if isinstance(stmt, CoordStmt):
+ self._evaluate_coord(stmt)
+
+ elif isinstance(stmt, ParamStmt):
+ self._evaluate_param(stmt)
+
+ elif isinstance(stmt, ApertureStmt):
+ self._evaluate_aperture(stmt)
+
+ elif isinstance(stmt, (RegionModeStmt, QuadrantModeStmt)):
+ self._evaluate_mode(stmt)
+
+ elif isinstance(stmt, (CommentStmt, UnknownStmt, DeprecatedStmt, EofStmt)):
+ return
+
+ else:
+ raise Exception("Invalid statement to evaluate")
+
+ def _define_aperture(self, d, shape, modifiers):
+ aperture = None
+ if shape == 'C':
+ diameter = modifiers[0][0]
+
+ hole_diameter = 0
+ rectangular_hole = (0, 0)
+ if len(modifiers[0]) == 2:
+ hole_diameter = modifiers[0][1]
+ elif len(modifiers[0]) == 3:
+ rectangular_hole = modifiers[0][1:3]
+
+ aperture = Circle(position=None, diameter=diameter,
+ hole_diameter=hole_diameter,
+ hole_width=rectangular_hole[0],
+ hole_height=rectangular_hole[1],
+ units=self.settings.units)
+
+ elif shape == 'R':
+ width = modifiers[0][0]
+ height = modifiers[0][1]
+
+ hole_diameter = 0
+ rectangular_hole = (0, 0)
+ if len(modifiers[0]) == 3:
+ hole_diameter = modifiers[0][2]
+ elif len(modifiers[0]) == 4:
+ rectangular_hole = modifiers[0][2:4]
+
+ aperture = Rectangle(position=None, width=width, height=height,
+ hole_diameter=hole_diameter,
+ hole_width=rectangular_hole[0],
+ hole_height=rectangular_hole[1],
+ units=self.settings.units)
+ elif shape == 'O':
+ width = modifiers[0][0]
+ height = modifiers[0][1]
+
+ hole_diameter = 0
+ rectangular_hole = (0, 0)
+ if len(modifiers[0]) == 3:
+ hole_diameter = modifiers[0][2]
+ elif len(modifiers[0]) == 4:
+ rectangular_hole = modifiers[0][2:4]
+
+ aperture = Obround(position=None, width=width, height=height,
+ hole_diameter=hole_diameter,
+ hole_width=rectangular_hole[0],
+ hole_height=rectangular_hole[1],
+ units=self.settings.units)
+ elif shape == 'P':
+ outer_diameter = modifiers[0][0]
+ number_vertices = int(modifiers[0][1])
+ if len(modifiers[0]) > 2:
+ rotation = modifiers[0][2]
+ else:
+ rotation = 0
+
+ hole_diameter = 0
+ rectangular_hole = (0, 0)
+ if len(modifiers[0]) == 4:
+ hole_diameter = modifiers[0][3]
+ elif len(modifiers[0]) >= 5:
+ rectangular_hole = modifiers[0][3:5]
+
+ aperture = Polygon(position=None, sides=number_vertices,
+ radius=outer_diameter/2.0,
+ hole_diameter=hole_diameter,
+ hole_width=rectangular_hole[0],
+ hole_height=rectangular_hole[1],
+ rotation=rotation)
+ else:
+ aperture = self.macros[shape].build(modifiers)
+
+ aperture.units = self.settings.units
+ self.apertures[d] = aperture
+
+ def _evaluate_mode(self, stmt):
+ if stmt.type == 'RegionMode':
+ if self.region_mode == 'on' and stmt.mode == 'off':
+ # Sometimes we have regions that have no points. Skip those
+ if self.current_region:
+ self.primitives.append(Region(self.current_region,
+ level_polarity=self.level_polarity, units=self.settings.units))
+
+ self.current_region = None
+ self.region_mode = stmt.mode
+ elif stmt.type == 'QuadrantMode':
+ self.quadrant_mode = stmt.mode
+
+ def _evaluate_param(self, stmt):
+ if stmt.param == "FS":
+ self.settings.zero_suppression = stmt.zero_suppression
+ self.settings.format = stmt.format
+ self.settings.notation = stmt.notation
+ elif stmt.param == "MO":
+ self.settings.units = stmt.mode
+ elif stmt.param == "IP":
+ self.image_polarity = stmt.ip
+ elif stmt.param == "LP":
+ self.level_polarity = stmt.lp
+ elif stmt.param == "AM":
+ self.macros[stmt.name] = stmt
+ elif stmt.param == "AD":
+ self._define_aperture(stmt.d, stmt.shape, stmt.modifiers)
+
+ def _evaluate_coord(self, stmt):
+ x = self.x if stmt.x is None else stmt.x
+ y = self.y if stmt.y is None else stmt.y
+
+ if stmt.function in ("G01", "G1"):
+ self.interpolation = 'linear'
+ elif stmt.function in ('G02', 'G2', 'G03', 'G3'):
+ self.interpolation = 'arc'
+ self.direction = ('clockwise' if stmt.function in
+ ('G02', 'G2') else 'counterclockwise')
+
+ if stmt.only_function:
+ # Sometimes we get a coordinate statement
+ # that only sets the function. If so, don't
+ # try futher otherwise that might draw/flash something
+ return
+
+ if stmt.op:
+ self.op = stmt.op
+ else:
+ # no implicit op allowed, force here if coord block doesn't have it
+ stmt.op = self.op
+
+ if self.op == "D01" or self.op == "D1":
+ start = (self.x, self.y)
+ end = (x, y)
+
+ if self.interpolation == 'linear':
+ if self.region_mode == 'off':
+ self.primitives.append(Line(start, end,
+ self.apertures[self.aperture],
+ level_polarity=self.level_polarity,
+ units=self.settings.units))
+ else:
+ # from gerber spec revision J3, Section 4.5, page 55:
+ # The segments are not graphics objects in themselves; segments are part of region which is the graphics object. The segments have no thickness.
+ # The current aperture is associated with the region.
+ # This has no graphical effect, but allows all its attributes to
+ # be applied to the region.
+
+ if self.current_region is None:
+ self.current_region = [Line(start, end,
+ self.apertures.get(self.aperture,
+ Circle((0, 0), 0)),
+ level_polarity=self.level_polarity,
+ units=self.settings.units), ]
+ else:
+ self.current_region.append(Line(start, end,
+ self.apertures.get(self.aperture,
+ Circle((0, 0), 0)),
+ level_polarity=self.level_polarity,
+ units=self.settings.units))
+ else:
+ i = 0 if stmt.i is None else stmt.i
+ j = 0 if stmt.j is None else stmt.j
+ center = self._find_center(start, end, (i, j))
+ if self.region_mode == 'off':
+ self.primitives.append(Arc(start, end, center, self.direction,
+ self.apertures[self.aperture],
+ quadrant_mode=self.quadrant_mode,
+ level_polarity=self.level_polarity,
+ units=self.settings.units))
+ else:
+ if self.current_region is None:
+ self.current_region = [Arc(start, end, center, self.direction,
+ self.apertures.get(self.aperture, Circle((0,0), 0)),
+ quadrant_mode=self.quadrant_mode,
+ level_polarity=self.level_polarity,
+ units=self.settings.units),]
+ else:
+ self.current_region.append(Arc(start, end, center, self.direction,
+ self.apertures.get(self.aperture, Circle((0,0), 0)),
+ quadrant_mode=self.quadrant_mode,
+ level_polarity=self.level_polarity,
+ units=self.settings.units))
+ # Gerbv seems to reset interpolation mode in regions..
+ # TODO: Make sure this is right.
+ self.interpolation = 'linear'
+
+ elif self.op == "D02" or self.op == "D2":
+
+ if self.region_mode == "on":
+ # D02 in the middle of a region finishes that region and starts a new one
+ if self.current_region and len(self.current_region) > 1:
+ self.primitives.append(Region(self.current_region,
+ level_polarity=self.level_polarity,
+ units=self.settings.units))
+ self.current_region = None
+
+ elif self.op == "D03" or self.op == "D3":
+ primitive = copy.deepcopy(self.apertures[self.aperture])
+
+ if primitive is not None:
+
+ if not isinstance(primitive, AMParamStmt):
+ primitive.position = (x, y)
+ primitive.level_polarity = self.level_polarity
+ primitive.units = self.settings.units
+ self.primitives.append(primitive)
+ else:
+ # Aperture Macro
+ for am_prim in primitive.primitives:
+ renderable = am_prim.to_primitive((x, y),
+ self.level_polarity,
+ self.settings.units)
+ if renderable is not None:
+ self.primitives.append(renderable)
+ self.x, self.y = x, y
+
+ def _find_center(self, start, end, offsets):
+ """
+ In single quadrant mode, the offsets are always positive, which means
+ there are 4 possible centers. The correct center is the only one that
+ results in an arc with sweep angle of less than or equal to 90 degrees
+ in the specified direction
+ """
+ two_pi = 2 * math.pi
+ if self.quadrant_mode == 'single-quadrant':
+ # The Gerber spec says single quadrant only has one possible center,
+ # and you can detect it based on the angle. But for real files, this
+ # seems to work better - there is usually only one option that makes
+ # sense for the center (since the distance should be the same
+ # from start and end). We select the center with the least error in
+ # radius from all the options with a valid sweep angle.
+
+ sqdist_diff_min = sys.maxsize
+ center = None
+ for factors in [(1, 1), (1, -1), (-1, 1), (-1, -1)]:
+
+ test_center = (start[0] + offsets[0] * factors[0],
+ start[1] + offsets[1] * factors[1])
+
+ # Find angle from center to start and end points
+ start_angle = math.atan2(*reversed([_start - _center for _start, _center in zip(start, test_center)]))
+ end_angle = math.atan2(*reversed([_end - _center for _end, _center in zip(end, test_center)]))
+
+ # Clamp angles to 0, 2pi
+ theta0 = (start_angle + two_pi) % two_pi
+ theta1 = (end_angle + two_pi) % two_pi
+
+ # Determine sweep angle in the current arc direction
+ if self.direction == 'counterclockwise':
+ sweep_angle = abs(theta1 - theta0)
+ else:
+ theta0 += two_pi
+ sweep_angle = abs(theta0 - theta1) % two_pi
+
+ # Calculate the radius error
+ sqdist_start = sq_distance(start, test_center)
+ sqdist_end = sq_distance(end, test_center)
+ sqdist_diff = abs(sqdist_start - sqdist_end)
+
+ # Take the option with the lowest radius error from the set of
+ # options with a valid sweep angle
+ # In some rare cases, the sweep angle is numerically (10**-14) above pi/2
+ # So it is safer to compare the angles with some tolerance
+ is_lowest_radius_error = sqdist_diff < sqdist_diff_min
+ is_valid_sweep_angle = sweep_angle >= 0 and sweep_angle <= math.pi / 2.0 + 1e-6
+ if is_lowest_radius_error and is_valid_sweep_angle:
+ center = test_center
+ sqdist_diff_min = sqdist_diff
+ return center
+ else:
+ return (start[0] + offsets[0], start[1] + offsets[1])
+
+ def _evaluate_aperture(self, stmt):
+ self.aperture = stmt.d
+
+def _match_one(expr, data):
+ match = expr.match(data)
+ if match is None:
+ return ({}, None)
+ else:
+ return (match.groupdict(), data[match.end(0):])
+
+
+def _match_one_from_many(exprs, data):
+ for expr in exprs:
+ match = expr.match(data)
+ if match:
+ return (match.groupdict(), data[match.end(0):])
+
+ return ({}, None)
generated by cgit (git 2.34.1) at 2024-11-09 22:56:39 +0000