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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
@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 : str = 'inch'
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 ['inch', 'mm']:
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[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)
# 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')
# 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.from(unit, value)
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')
class CamFile:
def __init__(self, filename=None, layer_name=None):
self.filename = filename
self.layer_name = layer_name
self.import_settings = None
@property
def bounds(self):
""" File boundaries
"""
pass
@property
def bounding_box(self):
pass
def render(self, ctx=None, invert=False, filename=None):
""" Generate image of layer.
Parameters
----------
ctx : :class:`GerberContext`
GerberContext subclass used for rendering the image
filename : string <optional>
If provided, save the rendered image to `filename`
"""
if ctx is None:
from .render import GerberCairoContext
ctx = GerberCairoContext()
ctx.set_bounds(self.bounding_box)
ctx.paint_background()
ctx.invert = invert
ctx.new_render_layer()
for p in self.primitives:
ctx.render(p)
ctx.flatten()
if filename is not None:
ctx.dump(filename)
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