1 files changed, 76 insertions, 0 deletions
diff --git a/gerber/render/apertures.py b/gerber/render/apertures.py
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+++ b/gerber/render/apertures.py
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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