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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.
"""
CAM File
============
**AM file classes**
This module provides common base classes for Excellon/Gerber CNC files
"""
class FileSettings(object):
""" CAM File Settings
Provides a common representation of gerber/excellon file settings
Parameters
----------
notation: string
notation format. either 'absolute' or 'incremental'
units : string
Measurement units. 'inch' or 'metric'
zero_suppression: string
'leading' to suppress leading zeros, 'trailing' to suppress trailing zeros.
This is the convention used in Gerber files.
format : tuple (int, int)
Decimal format
zeros : string
'leading' to include leading zeros, 'trailing to include trailing zeros.
This is the convention used in Excellon files
Notes
-----
Either `zeros` or `zero_suppression` should be specified, there is no need to
specify both. `zero_suppression` will take on the opposite value of `zeros`
and vice versa
"""
def __init__(self, notation='absolute', units='inch',
zero_suppression=None, format=(2, 5), zeros=None,
angle_units='degrees'):
if notation not in ['absolute', 'incremental']:
raise ValueError('Notation must be either absolute or incremental')
self.notation = notation
if units not in ['inch', 'metric']:
raise ValueError('Units must be either inch or metric')
self.units = units
if zero_suppression is None and zeros is None:
self.zero_suppression = 'trailing'
elif zero_suppression == zeros:
raise ValueError('Zeros and Zero Suppression must be different. \
Best practice is to specify only one.')
elif zero_suppression is not None:
if zero_suppression not in ['leading', 'trailing']:
raise ValueError('Zero suppression must be either leading or \
trailling')
self.zero_suppression = zero_suppression
elif zeros is not None:
if zeros not in ['leading', 'trailing']:
raise ValueError('Zeros must be either leading or trailling')
self.zeros = zeros
if len(format) != 2:
raise ValueError('Format must be a tuple(n=2) of integers')
self.format = format
if angle_units not in ('degrees', 'radians'):
raise ValueError('Angle units may be degrees or radians')
self.angle_units = angle_units
@property
def zero_suppression(self):
return self._zero_suppression
@zero_suppression.setter
def zero_suppression(self, value):
self._zero_suppression = value
self._zeros = 'leading' if value == 'trailing' else 'trailing'
@property
def zeros(self):
return self._zeros
@zeros.setter
def zeros(self, value):
self._zeros = value
self._zero_suppression = 'leading' if value == 'trailing' else 'trailing'
def __getitem__(self, key):
if key == 'notation':
return self.notation
elif key == 'units':
return self.units
elif key == 'zero_suppression':
return self.zero_suppression
elif key == 'zeros':
return self.zeros
elif key == 'format':
return self.format
elif key == 'angle_units':
return self.angle_units
else:
raise KeyError()
def __setitem__(self, key, value):
if key == 'notation':
if value not in ['absolute', 'incremental']:
raise ValueError('Notation must be either \
absolute or incremental')
self.notation = value
elif key == 'units':
if value not in ['inch', 'metric']:
raise ValueError('Units must be either inch or metric')
self.units = value
elif key == 'zero_suppression':
if value not in ['leading', 'trailing']:
raise ValueError('Zero suppression must be either leading or \
trailling')
self.zero_suppression = value
elif key == 'zeros':
if value not in ['leading', 'trailing']:
raise ValueError('Zeros must be either leading or trailling')
self.zeros = value
elif key == 'format':
if len(value) != 2:
raise ValueError('Format must be a tuple(n=2) of integers')
self.format = value
elif key == 'angle_units':
if value not in ('degrees', 'radians'):
raise ValueError('Angle units may be degrees or radians')
self.angle_units = value
else:
raise KeyError('%s is not a valid key' % key)
def __eq__(self, other):
return (self.notation == other.notation and
self.units == other.units and
self.zero_suppression == other.zero_suppression and
self.format == other.format and
self.angle_units == other.angle_units)
class CamFile(object):
""" Base class for Gerber/Excellon files.
Provides a common set of settings parameters.
Parameters
----------
settings : FileSettings
The current file configuration.
primitives : iterable
List of primitives in the file.
filename : string
Name of the file that this CamFile represents.
layer_name : string
Name of the PCB layer that the file represents
Attributes
----------
settings : FileSettings
File settings as a FileSettings object
notation : string
File notation setting. May be either 'absolute' or 'incremental'
units : string
File units setting. May be 'inch' or 'metric'
zero_suppression : string
File zero-suppression setting. May be either 'leading' or 'trailling'
format : tuple (<int>, <int>)
File decimal representation format as a tuple of (integer digits,
decimal digits)
"""
def __init__(self, statements=None, settings=None, primitives=None,
filename=None, layer_name=None):
if settings is not None:
self.notation = settings['notation']
self.units = settings['units']
self.zero_suppression = settings['zero_suppression']
self.zeros = settings['zeros']
self.format = settings['format']
else:
self.notation = 'absolute'
self.units = 'inch'
self.zero_suppression = 'trailing'
self.zeros = 'leading'
self.format = (2, 5)
self.statements = statements if statements is not None else []
self.primitives = primitives
self.filename = filename
self.layer_name = layer_name
@property
def settings(self):
""" File settings
Returns
-------
settings : FileSettings (dict-like)
A FileSettings object with the specified configuration.
"""
return FileSettings(self.notation, self.units, self.zero_suppression,
self.format)
@property
def bounds(self):
""" File boundaries
"""
pass
def render(self, ctx, 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`
"""
bounds = [tuple([x * 1.2, y*1.2]) for x, y in self.bounds]
ctx.set_bounds(bounds)
for p in self.primitives:
ctx.render(p)
if filename is not None:
ctx.dump(filename)
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