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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.
"""
gerber.utils
============
**Gerber and Excellon file handling utilities**
This module provides utility functions for working with Gerber and Excellon
files.
"""
import os
from math import radians, sin, cos, sqrt, atan2, pi
class LengthUnit:
def __init__(self, name, shorthand, this_in_mm):
self.name = name
self.shorthand = shorthand
self.factor = this_in_mm
def convert_from(self, unit, value):
if isinstance(unit, str):
unit = units[unit]
if unit == self or unit is None or value is None:
return value
return value * unit.factor / self.factor
def convert_to(self, unit, value):
if isinstance(unit, str):
unit = to_unit(unit)
if unit is None:
return value
return unit.convert_from(self, value)
def __call__(self, value, unit):
return self.convert_from(unit, value)
def __eq__(self, other):
if isinstance(other, str):
return other.lower() in (self.name, self.shorthand)
else:
return id(self) == id(other)
MILLIMETERS_PER_INCH = 25.4
Inch = LengthUnit('inch', 'in', MILLIMETERS_PER_INCH)
MM = LengthUnit('millimeter', 'mm', 1)
units = {'inch': Inch, 'mm': MM, None: None}
to_unit = lambda name: units[name]
def decimal_string(value, precision=6, padding=False):
""" Convert float to string with limited precision
Parameters
----------
value : float
A floating point value.
precision :
Maximum number of decimal places to print
Returns
-------
value : string
The specified value as a string.
"""
floatstr = '%0.10g' % value
integer = None
decimal = None
if '.' in floatstr:
integer, decimal = floatstr.split('.')
elif ',' in floatstr:
integer, decimal = floatstr.split(',')
else:
integer, decimal = floatstr, "0"
if len(decimal) > precision:
decimal = decimal[:precision]
elif padding:
decimal = decimal + (precision - len(decimal)) * '0'
if integer or decimal:
return ''.join([integer, '.', decimal])
else:
return int(floatstr)
def validate_coordinates(position):
if position is not None:
if len(position) != 2:
raise TypeError('Position must be a tuple (n=2) of coordinates')
else:
for coord in position:
if not (isinstance(coord, int) or isinstance(coord, float)):
raise TypeError('Coordinates must be integers or floats')
def rotate_point(point, angle, center=(0.0, 0.0)):
""" Rotate a point about another point.
Parameters
-----------
point : tuple(<float>, <float>)
Point to rotate about origin or center point
angle : float
Angle to rotate the point [degrees]
center : tuple(<float>, <float>)
Coordinates about which the point is rotated. Defaults to the origin.
Returns
-------
rotated_point : tuple(<float>, <float>)
`point` rotated about `center` by `angle` degrees.
"""
angle = radians(angle)
cos_angle = cos(angle)
sin_angle = sin(angle)
return (
cos_angle * (point[0] - center[0]) - sin_angle * (point[1] - center[1]) + center[0],
sin_angle * (point[0] - center[0]) + cos_angle * (point[1] - center[1]) + center[1])
def nearly_equal(point1, point2, ndigits = 6):
'''Are the points nearly equal'''
return round(point1[0] - point2[0], ndigits) == 0 and round(point1[1] - point2[1], ndigits) == 0
def sq_distance(point1, point2):
diff1 = point1[0] - point2[0]
diff2 = point1[1] - point2[1]
return diff1 * diff1 + diff2 * diff2
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