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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>
#
# 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.
from dataclasses import dataclass
from copy import deepcopy
from .utils import LengthUnit, MM, Inch
@dataclass
class FileSettings:
'''
.. note::
Format and zero suppression are configurable. Note that the Excellon
and Gerber formats use opposite terminology with respect to leading
and trailing zeros. The Gerber format specifies which zeros are
suppressed, while the Excellon format specifies which zeros are
included. This function uses the Gerber-file convention, so an
Excellon file in LZ (leading zeros) mode would use
`zeros='trailing'`
'''
notation : str = 'absolute'
unit : LengthUnit = MM
angle_unit : str = 'degree'
zeros : bool = None
number_format : tuple = (2, 5)
# input validation
def __setattr__(self, name, value):
if name == 'unit' and value not in [MM, Inch]:
raise ValueError(f'Unit must be either Inch or MM, not {value}')
elif name == 'notation' and value not in ['absolute', 'incremental']:
raise ValueError(f'Notation must be either "absolute" or "incremental", not {value}')
elif name == 'angle_unit' and value not in ('degree', 'radian'):
raise ValueError(f'Angle unit may be "degree" or "radian", not {value}')
elif name == 'zeros' and value not in [None, 'leading', 'trailing']:
raise ValueError(f'zeros must be either "leading" or "trailing" or None, not {value}')
elif name == 'number_format':
if len(value) != 2:
raise ValueError(f'Number format must be a (integer, fractional) tuple of integers, not {value}')
if value != (None, None) and (value[0] > 6 or value[1] > 7):
raise ValueError(f'Requested precision of {value} is too high. Only up to 6.7 digits are supported by spec.')
super().__setattr__(name, value)
def copy(self):
return deepcopy(self)
def __str__(self):
return f'<File settings: unit={self.unit}/{self.angle_unit} notation={self.notation} zeros={self.zeros} number_format={self.number_format}>'
@property
def incremental(self):
return self.notation == 'incremental'
@property
def absolute(self):
return not self.incremental # default to absolute
def parse_gerber_value(self, value):
if not value:
return None
# Handle excellon edge case with explicit decimal. "That was easy!"
if '.' in value:
return float(value)
# TARGET3001! exports zeros as "00" even when it uses an explicit decimal point everywhere else.
if int(value) == 0:
return 0
# Format precision
integer_digits, decimal_digits = self.number_format
if integer_digits is None or decimal_digits is None:
raise SyntaxError('No number format set and value does not contain a decimal point. If this is an Allegro '
'Excellon drill file make sure either nc_param.txt or ncdrill.log ends up in the same folder as '
'it, because Allegro does not include this critical information in their Excellon output. If you '
'call this through ExcellonFile.from_string, you must manually supply from_string with a '
'FileSettings object from excellon.parse_allegro_ncparam.')
# Remove extraneous information
sign = '-' if value[0] == '-' else ''
value = value.lstrip('+-')
if self.zeros == 'leading':
value = '0'*decimal_digits + value # pad with zeros to ensure we have enough decimals
return float(sign + value[:-decimal_digits] + '.' + value[-decimal_digits:])
else: # no or trailing zero suppression
return float(sign + value[:integer_digits] + '.' + value[integer_digits:])
def write_gerber_value(self, value, unit=None):
""" Convert a floating point number to a Gerber/Excellon-formatted string. """
if unit is not None:
value = self.unit(value, unit)
integer_digits, decimal_digits = self.number_format
if integer_digits is None:
integer_digits = 3
if decimal_digits is None:
decimal_digits = 3
# negative sign affects padding, so deal with it at the end...
sign = '-' if value < 0 else ''
# FIXME never use exponential notation here
num = format(abs(value), f'0{integer_digits+decimal_digits+1}.{decimal_digits}f').replace('.', '')
# Suppression...
if self.zeros == 'trailing':
num = num.rstrip('0')
elif self.zeros == 'leading':
num = num.lstrip('0')
# Edge case. Per Gerber spec if the value is 0 we should return a single '0' in all cases, see page 77.
elif not num.strip('0'):
num = '0'
return sign + (num or '0')
def write_excellon_value(self, value, unit=None):
if unit is not None:
value = self.unit(value, unit)
integer_digits, decimal_digits = self.number_format
if integer_digits is None:
integer_digits = 2
if decimal_digits is None:
decimal_digits = 6
return format(value, f'0{integer_digits+decimal_digits+1}.{decimal_digits}f')
class Tag:
def __init__(self, name, children=None, root=False, **attrs):
self.name, self.attrs = name, attrs
self.children = children or []
self.root = root
def __str__(self):
prefix = '<?xml version="1.0" encoding="utf-8"?>\n' if self.root else ''
opening = ' '.join([self.name] + [f'{key.replace("__", ":")}="{value}"' for key, value in self.attrs.items()])
if self.children:
children = '\n'.join(textwrap.indent(str(c), ' ') for c in self.children)
return f'{prefix}<{opening}>\n{children}\n</{self.name}>'
else:
return f'{prefix}<{opening}/>'
class CamFile:
def __init__(self, filename=None, layer_name=None):
self.filename = filename
self.layer_name = layer_name
self.import_settings = None
self.objects = []
def to_svg(self, tag=Tag, margin=0, arg_unit=MM, svg_unit=MM, force_bounds=None, color='black'):
if force_bounds is None:
(min_x, min_y), (max_x, max_y) = self.bounding_box(svg_unit, default=((0, 0), (0, 0)))
else:
(min_x, min_y), (max_x, max_y) = force_bounds
min_x = svg_unit(min_x, arg_unit)
min_y = svg_unit(min_y, arg_unit)
max_x = svg_unit(max_x, arg_unit)
max_y = svg_unit(max_y, arg_unit)
if margin:
margin = svg_unit(margin, arg_unit)
min_x -= margin
min_y -= margin
max_x += margin
max_y += margin
w, h = max_x - min_x, max_y - min_y
w = 1.0 if math.isclose(w, 0.0) else w
h = 1.0 if math.isclose(h, 0.0) else h
primitives = [ prim.to_svg(tag, color) for obj in self.objects for prim in obj.to_primitives(unit=svg_unit) ]
# setup viewport transform flipping y axis
xform = f'translate({min_x} {min_y+h}) scale(1 -1) translate({-min_x} {-min_y})'
svg_unit = 'in' if svg_unit == 'inch' else 'mm'
# TODO export apertures as <uses> where reasonable.
return tag('svg', [tag('g', primitives, transform=xform)],
width=f'{w}{svg_unit}', height=f'{h}{svg_unit}',
viewBox=f'{min_x} {min_y} {w} {h}',
xmlns="http://www.w3.org/2000/svg", xmlns__xlink="http://www.w3.org/1999/xlink", root=True)
def size(self, unit=MM):
(x0, y0), (x1, y1) = self.bounding_box(unit, default=((0, 0), (0, 0)))
return (x1 - x0, y1 - y0)
def bounding_box(self, unit=MM, default=None):
""" Calculate bounding box of file. Returns value given by 'default' argument when there are no graphical
objects (default: None)
"""
bounds = [ p.bounding_box(unit) for p in self.objects ]
if not bounds:
return default
min_x = min(x0 for (x0, y0), (x1, y1) in bounds)
min_y = min(y0 for (x0, y0), (x1, y1) in bounds)
max_x = max(x1 for (x0, y0), (x1, y1) in bounds)
max_y = max(y1 for (x0, y0), (x1, y1) in bounds)
return ((min_x, min_y), (max_x, max_y))
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