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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.render.apertures
============
**Gerber Aperture base classes**
This module provides base classes for gerber apertures. These are used by
the rendering engine to draw the gerber file.
"""
import math
class Aperture(object):
""" Gerber Aperture base class
"""
def draw(self, ctx, x, y):
raise NotImplementedError('The draw method must be implemented \
in an Aperture subclass.')
def flash(self, ctx, x, y):
raise NotImplementedError('The flash method must be implemented \
in an Aperture subclass.')
def _arc_params(self, startx, starty, x, y, i, j):
center = (startx + i, starty + j)
radius = math.sqrt(math.pow(center[0] - x, 2) +
math.pow(center[1] - y, 2))
delta_x0 = startx - center[0]
delta_y0 = center[1] - starty
delta_x1 = x - center[0]
delta_y1 = center[1] - y
start_angle = math.atan2(delta_y0, delta_x0)
end_angle = math.atan2(delta_y1, delta_x1)
return {'center': center, 'radius': radius,
'start_angle': start_angle, 'end_angle': end_angle}
class Circle(Aperture):
""" Circular Aperture base class
"""
def __init__(self, diameter=0.0):
self.diameter = diameter
class Rect(Aperture):
""" Rectangular Aperture base class
"""
def __init__(self, size=(0, 0)):
self.size = size
class Obround(Aperture):
""" Obround Aperture base class
"""
def __init__(self, size=(0, 0)):
self.size = size
class Polygon(Aperture):
""" Polygon Aperture base class
"""
pass
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