Graft pcb-tools upstream onto gerbonara tree

1 files changed, 1046 insertions, 0 deletions

diff --git a/gerber/am_statements.py b/gerber/am_statements.py
new file mode 100644
index 0000000..31c0ae4
--- /dev/null
+++ b/gerber/am_statements.py
@@ -0,0 +1,1046 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# copyright 2015 Hamilton Kibbe <ham@hamiltonkib.be> and Paulo Henrique Silva
+# <ph.silva@gmail.com>
+
+# 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 math import asin
+import math
+
+from .primitives import *
+from .utils import validate_coordinates, inch, metric, rotate_point
+
+
+
+# TODO: Add support for aperture macro variables
+__all__ = ['AMPrimitive', 'AMCommentPrimitive', 'AMCirclePrimitive',
+           'AMVectorLinePrimitive', 'AMOutlinePrimitive', 'AMPolygonPrimitive',
+           'AMMoirePrimitive', 'AMThermalPrimitive', 'AMCenterLinePrimitive',
+           'AMLowerLeftLinePrimitive', 'AMUnsupportPrimitive']
+
+
+class AMPrimitive(object):
+    """ Aperture Macro Primitive Base Class
+
+    Parameters
+    ----------
+    code : int
+        primitive shape code
+
+    exposure : str
+        on or off Primitives with exposure on create a slid part of
+        the macro aperture, and primitives with exposure off erase the
+        solid part created previously in the aperture macro definition.
+        .. note::
+            The erasing effect is limited to the aperture definition in
+            which it occurs.
+
+    Returns
+    -------
+    primitive : :class: `gerber.am_statements.AMPrimitive`
+
+    Raises
+    ------
+    TypeError, ValueError
+    """
+
+    def __init__(self, code, exposure=None):
+        VALID_CODES = (0, 1, 2, 4, 5, 6, 7, 20, 21, 22, 9999)
+        if not isinstance(code, int):
+            raise TypeError('Aperture Macro Primitive code must be an integer')
+        elif code not in VALID_CODES:
+            raise ValueError('Invalid Code. Valid codes are %s.' %
+                             ', '.join(map(str, VALID_CODES)))
+        if exposure is not None and exposure.lower() not in ('on', 'off'):
+            raise ValueError('Exposure must be either on or off')
+        self.code = code
+        self.exposure = exposure.lower() if exposure is not None else None
+
+    def to_inch(self):
+        raise NotImplementedError('Subclass must implement `to-inch`')
+
+    def to_metric(self):
+        raise NotImplementedError('Subclass must implement `to-metric`')
+
+    @property
+    def _level_polarity(self):
+        if self.exposure == 'off':
+            return 'clear'
+        return 'dark'
+
+    def to_primitive(self, units):
+        """ Return a Primitive instance based on the specified macro params.
+        """
+        print('Rendering {}s is not supported yet.'.format(str(self.__class__)))
+
+    def __eq__(self, other):
+        return self.__dict__ == other.__dict__
+
+
+class AMCommentPrimitive(AMPrimitive):
+    """ Aperture Macro Comment primitive. Code 0
+
+    The comment primitive has no image meaning. It is used to include human-
+    readable comments into the AM command.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.1:** Comment, primitive code 0
+
+    Parameters
+    ----------
+    code : int
+        Aperture Macro primitive code. 0 Indicates an AMCommentPrimitive
+
+    comment : str
+        The comment as a string.
+
+    Returns
+    -------
+    CommentPrimitive : :class:`gerber.am_statements.AMCommentPrimitive`
+        An Initialized AMCommentPrimitive
+
+    Raises
+    ------
+    ValueError
+    """
+    @classmethod
+    def from_gerber(cls, primitive):
+        primitive = primitive.strip()
+        code = int(primitive[0])
+        comment = primitive[1:]
+        return cls(code, comment)
+
+    def __init__(self, code, comment):
+        if code != 0:
+            raise ValueError('Not a valid Aperture Macro Comment statement')
+        super(AMCommentPrimitive, self).__init__(code)
+        self.comment = comment.strip(' *')
+
+    def to_inch(self):
+        pass
+
+    def to_metric(self):
+        pass
+
+    def to_gerber(self, settings=None):
+        return '0 %s *' % self.comment
+
+    def to_primitive(self, units):
+        """
+        Returns None - has not primitive representation
+        """
+        return None
+
+    def __str__(self):
+        return '<Aperture Macro Comment: %s>' % self.comment
+
+
+class AMCirclePrimitive(AMPrimitive):
+    """ Aperture macro Circle primitive. Code 1
+
+    A circle primitive is defined by its center point and diameter.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.2:** Circle, primitive code 1
+
+    Parameters
+    ----------
+    code : int
+        Circle Primitive code. Must be 1
+
+    exposure : string
+        'on' or 'off'
+
+    diameter : float
+        Circle diameter
+
+    position : tuple (<float>, <float>)
+        Position of the circle relative to the macro origin
+
+    Returns
+    -------
+    CirclePrimitive : :class:`gerber.am_statements.AMCirclePrimitive`
+        An initialized AMCirclePrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(',')
+        code = int(modifiers[0])
+        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
+        diameter = float(modifiers[2])
+        position = (float(modifiers[3]), float(modifiers[4]))
+        return cls(code, exposure, diameter, position)
+
+    @classmethod
+    def from_primitive(cls, primitive):
+        return cls(1, 'on', primitive.diameter, primitive.position)
+
+    def __init__(self, code, exposure, diameter, position):
+        validate_coordinates(position)
+        if code != 1:
+            raise ValueError('CirclePrimitive code is 1')
+        super(AMCirclePrimitive, self).__init__(code, exposure)
+        self.diameter = diameter
+        self.position = position
+
+    def to_inch(self):
+        self.diameter = inch(self.diameter)
+        self.position = tuple([inch(x) for x in self.position])
+
+    def to_metric(self):
+        self.diameter = metric(self.diameter)
+        self.position = tuple([metric(x) for x in self.position])
+
+    def to_gerber(self, settings=None):
+        data = dict(code=self.code,
+                    exposure='1' if self.exposure == 'on' else 0,
+                    diameter=self.diameter,
+                    x=self.position[0],
+                    y=self.position[1])
+        return '{code},{exposure},{diameter},{x},{y}*'.format(**data)
+
+    def to_primitive(self, units):
+        return Circle((self.position), self.diameter, units=units, level_polarity=self._level_polarity)
+
+
+class AMVectorLinePrimitive(AMPrimitive):
+    """ Aperture Macro Vector Line primitive. Code 2 or 20.
+
+    A vector line is a rectangle defined by its line width, start, and end
+    points. The line ends are rectangular.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.3:** Vector Line, primitive code 2 or 20.
+
+    Parameters
+    ----------
+    code : int
+        Vector Line Primitive code. Must be either 2 or 20.
+
+    exposure : string
+        'on' or 'off'
+
+    width : float
+        Line width
+
+    start : tuple (<float>, <float>)
+        coordinate of line start point
+
+    end : tuple (<float>, <float>)
+        coordinate of line end point
+
+    rotation : float
+        Line rotation about the origin.
+
+    Returns
+    -------
+    LinePrimitive : :class:`gerber.am_statements.AMVectorLinePrimitive`
+        An initialized AMVectorLinePrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+
+    @classmethod
+    def from_primitive(cls, primitive):
+        return cls(2, 'on', primitive.aperture.width, primitive.start, primitive.end, 0)
+
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(',')
+        code = int(modifiers[0])
+        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
+        width = float(modifiers[2])
+        start = (float(modifiers[3]), float(modifiers[4]))
+        end = (float(modifiers[5]), float(modifiers[6]))
+        rotation = float(modifiers[7])
+        return cls(code, exposure, width, start, end, rotation)
+
+    def __init__(self, code, exposure, width, start, end, rotation):
+        validate_coordinates(start)
+        validate_coordinates(end)
+        if code not in (2, 20):
+            raise ValueError('VectorLinePrimitive codes are 2 or 20')
+        super(AMVectorLinePrimitive, self).__init__(code, exposure)
+        self.width = width
+        self.start = start
+        self.end = end
+        self.rotation = rotation
+
+    def to_inch(self):
+        self.width = inch(self.width)
+        self.start = tuple([inch(x) for x in self.start])
+        self.end = tuple([inch(x) for x in self.end])
+
+    def to_metric(self):
+        self.width = metric(self.width)
+        self.start = tuple([metric(x) for x in self.start])
+        self.end = tuple([metric(x) for x in self.end])
+
+    def to_gerber(self, settings=None):
+        fmtstr = '{code},{exp},{width},{startx},{starty},{endx},{endy},{rotation}*'
+        data = dict(code=self.code,
+                    exp=1 if self.exposure == 'on' else 0,
+                    width=self.width,
+                    startx=self.start[0],
+                    starty=self.start[1],
+                    endx=self.end[0],
+                    endy=self.end[1],
+                    rotation=self.rotation)
+        return fmtstr.format(**data)
+
+    def to_primitive(self, units):
+        """
+        Convert this to a primitive. We use the Outline to represent this (instead of Line)
+        because the behaviour of the end caps is different for aperture macros compared to Lines
+        when rotated.
+        """
+
+        # Use a line to generate our vertices easily
+        line = Line(self.start, self.end, Rectangle(None, self.width, self.width))
+        vertices = line.vertices
+
+        aperture = Circle((0, 0), 0)
+
+        lines = []
+        prev_point = rotate_point(vertices[-1], self.rotation, (0, 0))
+        for point in vertices:
+            cur_point = rotate_point(point, self.rotation, (0, 0))
+
+            lines.append(Line(prev_point, cur_point, aperture))
+
+        return Outline(lines, units=units, level_polarity=self._level_polarity)
+
+
+class AMOutlinePrimitive(AMPrimitive):
+    """ Aperture Macro Outline primitive. Code 4.
+
+    An outline primitive is an area enclosed by an n-point polygon defined by
+    its start point and n subsequent points. The outline must be closed, i.e.
+    the last point must be equal to the start point. Self intersecting
+    outlines are not allowed.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.6:** Outline, primitive code 4.
+
+     Parameters
+    ----------
+    code : int
+        OutlinePrimitive code. Must be 6.
+
+    exposure : string
+        'on' or 'off'
+
+    start_point : tuple (<float>, <float>)
+        coordinate of outline start point
+
+    points : list of tuples (<float>, <float>)
+        coordinates of subsequent points
+
+    rotation : float
+        outline rotation about the origin.
+
+    Returns
+    -------
+    OutlinePrimitive : :class:`gerber.am_statements.AMOutlineinePrimitive`
+        An initialized AMOutlinePrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+
+    @classmethod
+    def from_primitive(cls, primitive):
+
+        start_point = (round(primitive.primitives[0].start[0], 6), round(primitive.primitives[0].start[1], 6))
+        points = []
+        for prim in primitive.primitives:
+            points.append((round(prim.end[0], 6), round(prim.end[1], 6)))
+
+        rotation = 0.0
+
+        return cls(4, 'on', start_point, points, rotation)
+
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(",")
+
+        code = int(modifiers[0])
+        exposure = "on" if float(modifiers[1]) == 1 else "off"
+        n = int(float(modifiers[2]))
+        start_point = (float(modifiers[3]), float(modifiers[4]))
+        points = []
+        for i in range(n):
+            points.append((float(modifiers[5 + i * 2]),
+                           float(modifiers[5 + i * 2 + 1])))
+        rotation = float(modifiers[-1])
+        return cls(code, exposure, start_point, points, rotation)
+
+    def __init__(self, code, exposure, start_point, points, rotation):
+        """ Initialize AMOutlinePrimitive
+        """
+        validate_coordinates(start_point)
+        for point in points:
+            validate_coordinates(point)
+        if code != 4:
+            raise ValueError('OutlinePrimitive code is 4')
+        super(AMOutlinePrimitive, self).__init__(code, exposure)
+        self.start_point = start_point
+        if points[-1] != start_point:
+            raise ValueError('OutlinePrimitive must be closed')
+        self.points = points
+        self.rotation = rotation
+
+    def to_inch(self):
+        self.start_point = tuple([inch(x) for x in self.start_point])
+        self.points = tuple([(inch(x), inch(y)) for x, y in self.points])
+
+    def to_metric(self):
+        self.start_point = tuple([metric(x) for x in self.start_point])
+        self.points = tuple([(metric(x), metric(y)) for x, y in self.points])
+
+    def to_gerber(self, settings=None):
+        data = dict(
+            code=self.code,
+            exposure="1" if self.exposure == "on" else "0",
+            n_points=len(self.points),
+            start_point="%.6g,%.6g" % self.start_point,
+            points=",\n".join(["%.6g,%.6g" % point for point in self.points]),
+            rotation=str(self.rotation)
+        )
+        return "{code},{exposure},{n_points},{start_point},{points},{rotation}*".format(**data)
+
+    def to_primitive(self, units):
+        """
+        Convert this to a drawable primitive. This uses the Outline instead of Line
+        primitive to handle differences in end caps when rotated.
+        """
+
+        lines = []
+        prev_point = rotate_point(self.start_point, self.rotation)
+        for point in self.points:
+            cur_point = rotate_point(point, self.rotation)
+
+            lines.append(Line(prev_point, cur_point, Circle((0,0), 0)))
+
+            prev_point = cur_point
+
+        if lines[0].start != lines[-1].end:
+            raise ValueError('Outline must be closed')
+
+        return Outline(lines, units=units, level_polarity=self._level_polarity)
+
+
+class AMPolygonPrimitive(AMPrimitive):
+    """ Aperture Macro Polygon primitive. Code 5.
+
+    A polygon primitive is a regular polygon defined by the number of
+    vertices, the center point, and the diameter of the circumscribed circle.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.8:** Polygon, primitive code 5.
+
+    Parameters
+    ----------
+    code : int
+        PolygonPrimitive code. Must be 5.
+
+    exposure : string
+        'on' or 'off'
+
+    vertices : int, 3 <= vertices <= 12
+        Number of vertices
+
+    position : tuple (<float>, <float>)
+        X and Y coordinates of polygon center
+
+    diameter : float
+        diameter of circumscribed circle.
+
+    rotation : float
+        polygon rotation about the origin.
+
+    Returns
+    -------
+    PolygonPrimitive : :class:`gerber.am_statements.AMPolygonPrimitive`
+        An initialized AMPolygonPrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+
+    @classmethod
+    def from_primitive(cls, primitive):
+        return cls(5, 'on', primitive.sides, primitive.position, primitive.diameter, primitive.rotation)
+
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(",")
+        code = int(modifiers[0])
+        exposure = "on" if float(modifiers[1]) == 1 else "off"
+        vertices = int(float(modifiers[2]))
+        position = (float(modifiers[3]), float(modifiers[4]))
+        try:
+            diameter = float(modifiers[5])
+        except:
+            diameter = 0
+
+        rotation = float(modifiers[6])
+        return cls(code, exposure, vertices, position, diameter, rotation)
+
+    def __init__(self, code, exposure, vertices, position, diameter, rotation):
+        """ Initialize AMPolygonPrimitive
+        """
+        if code != 5:
+            raise ValueError('PolygonPrimitive code is 5')
+        super(AMPolygonPrimitive, self).__init__(code, exposure)
+        if vertices < 3 or vertices > 12:
+            raise ValueError('Number of vertices must be between 3 and 12')
+        self.vertices = vertices
+        validate_coordinates(position)
+        self.position = position
+        self.diameter = diameter
+        self.rotation = rotation
+
+    def to_inch(self):
+        self.position = tuple([inch(x) for x in self.position])
+        self.diameter = inch(self.diameter)
+
+    def to_metric(self):
+        self.position = tuple([metric(x) for x in self.position])
+        self.diameter = metric(self.diameter)
+
+    def to_gerber(self, settings=None):
+        data = dict(
+            code=self.code,
+            exposure="1" if self.exposure == "on" else "0",
+            vertices=self.vertices,
+            position="%.4g,%.4g" % self.position,
+            diameter='%.4g' % self.diameter,
+            rotation=str(self.rotation)
+        )
+        fmt = "{code},{exposure},{vertices},{position},{diameter},{rotation}*"
+        return fmt.format(**data)
+
+    def to_primitive(self, units):
+        return Polygon(self.position, self.vertices, self.diameter / 2.0, 0, rotation=math.radians(self.rotation), units=units, level_polarity=self._level_polarity)
+
+
+class AMMoirePrimitive(AMPrimitive):
+    """ Aperture Macro Moire primitive. Code 6.
+
+    The moire primitive is a cross hair centered on concentric rings (annuli).
+    Exposure is always on.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.9:** Moire, primitive code 6.
+
+    Parameters
+    ----------
+    code : int
+        Moire Primitive code. Must be 6.
+
+    position : tuple (<float>, <float>)
+        X and Y coordinates of moire center
+
+    diameter : float
+        outer diameter of outer ring.
+
+    ring_thickness : float
+        thickness of concentric rings.
+
+    gap : float
+        gap between concentric rings.
+
+    max_rings : float
+        maximum number of rings
+
+    crosshair_thickness : float
+        thickness of crosshairs
+
+    crosshair_length : float
+        length of crosshairs
+
+    rotation : float
+        moire rotation about the origin.
+
+    Returns
+    -------
+    MoirePrimitive : :class:`gerber.am_statements.AMMoirePrimitive`
+        An initialized AMMoirePrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(",")
+        code = int(modifiers[0])
+        position = (float(modifiers[1]), float(modifiers[2]))
+        diameter = float(modifiers[3])
+        ring_thickness = float(modifiers[4])
+        gap = float(modifiers[5])
+        max_rings = int(float(modifiers[6]))
+        crosshair_thickness = float(modifiers[7])
+        crosshair_length = float(modifiers[8])
+        rotation = float(modifiers[9])
+        return cls(code, position, diameter, ring_thickness, gap, max_rings, crosshair_thickness, crosshair_length, rotation)
+
+    def __init__(self, code, position, diameter, ring_thickness, gap, max_rings, crosshair_thickness, crosshair_length, rotation):
+        """ Initialize AMoirePrimitive
+        """
+        if code != 6:
+            raise ValueError('MoirePrimitive code is 6')
+        super(AMMoirePrimitive, self).__init__(code, 'on')
+        validate_coordinates(position)
+        self.position = position
+        self.diameter = diameter
+        self.ring_thickness = ring_thickness
+        self.gap = gap
+        self.max_rings = max_rings
+        self.crosshair_thickness = crosshair_thickness
+        self.crosshair_length = crosshair_length
+        self.rotation = rotation
+
+    def to_inch(self):
+        self.position = tuple([inch(x) for x in self.position])
+        self.diameter = inch(self.diameter)
+        self.ring_thickness = inch(self.ring_thickness)
+        self.gap = inch(self.gap)
+        self.crosshair_thickness = inch(self.crosshair_thickness)
+        self.crosshair_length = inch(self.crosshair_length)
+
+    def to_metric(self):
+        self.position = tuple([metric(x) for x in self.position])
+        self.diameter = metric(self.diameter)
+        self.ring_thickness = metric(self.ring_thickness)
+        self.gap = metric(self.gap)
+        self.crosshair_thickness = metric(self.crosshair_thickness)
+        self.crosshair_length = metric(self.crosshair_length)
+
+
+    def to_gerber(self, settings=None):
+        data = dict(
+            code=self.code,
+            position="%.4g,%.4g" % self.position,
+            diameter=self.diameter,
+            ring_thickness=self.ring_thickness,
+            gap=self.gap,
+            max_rings=self.max_rings,
+            crosshair_thickness=self.crosshair_thickness,
+            crosshair_length=self.crosshair_length,
+            rotation=self.rotation
+        )
+        fmt = "{code},{position},{diameter},{ring_thickness},{gap},{max_rings},{crosshair_thickness},{crosshair_length},{rotation}*"
+        return fmt.format(**data)
+
+    def to_primitive(self, units):
+        #raise NotImplementedError()
+        return None
+
+
+class AMThermalPrimitive(AMPrimitive):
+    """ Aperture Macro Thermal primitive. Code 7.
+
+    The thermal primitive is a ring (annulus) interrupted by four gaps.
+    Exposure is always on.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.10:** Thermal, primitive code 7.
+
+    Parameters
+    ----------
+    code : int
+        Thermal Primitive code. Must be 7.
+
+    position : tuple (<float>, <float>)
+        X and Y coordinates of thermal center
+
+    outer_diameter : float
+        outer diameter of thermal.
+
+    inner_diameter : float
+        inner diameter of thermal.
+
+    gap : float
+        gap thickness
+
+    rotation : float
+        thermal rotation about the origin.
+
+    Returns
+    -------
+    ThermalPrimitive : :class:`gerber.am_statements.AMThermalPrimitive`
+        An initialized AMThermalPrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(",")
+        code = int(modifiers[0])
+        position = (float(modifiers[1]), float(modifiers[2]))
+        outer_diameter = float(modifiers[3])
+        inner_diameter = float(modifiers[4])
+        gap = float(modifiers[5])
+        rotation = float(modifiers[6])
+        return cls(code, position, outer_diameter, inner_diameter, gap, rotation)
+
+    def __init__(self, code, position, outer_diameter, inner_diameter, gap, rotation):
+        if code != 7:
+            raise ValueError('ThermalPrimitive code is 7')
+        super(AMThermalPrimitive, self).__init__(code, 'on')
+        validate_coordinates(position)
+        self.position = position
+        self.outer_diameter = outer_diameter
+        self.inner_diameter = inner_diameter
+        self.gap = gap
+        self.rotation = rotation
+
+    def to_inch(self):
+        self.position = tuple([inch(x) for x in self.position])
+        self.outer_diameter = inch(self.outer_diameter)
+        self.inner_diameter = inch(self.inner_diameter)
+        self.gap = inch(self.gap)
+
+    def to_metric(self):
+        self.position = tuple([metric(x) for x in self.position])
+        self.outer_diameter = metric(self.outer_diameter)
+        self.inner_diameter = metric(self.inner_diameter)
+        self.gap = metric(self.gap)
+
+    def to_gerber(self, settings=None):
+        data = dict(
+            code=self.code,
+            position="%.4g,%.4g" % self.position,
+            outer_diameter=self.outer_diameter,
+            inner_diameter=self.inner_diameter,
+            gap=self.gap,
+            rotation=self.rotation
+        )
+        fmt = "{code},{position},{outer_diameter},{inner_diameter},{gap},{rotation}*"
+        return fmt.format(**data)
+
+    def _approximate_arc_cw(self, start_angle, end_angle, radius, center):
+        """
+        Get an arc as a series of points
+
+        Parameters
+        ----------
+        start_angle : The start angle in radians
+        end_angle : The end angle in radians
+        radius`: Radius of the arc
+        center : The center point of the arc (x, y) tuple
+
+        Returns
+        -------
+        array of point tuples
+        """
+
+        # The total sweep
+        sweep_angle = end_angle - start_angle
+        num_steps = 10
+
+        angle_step = sweep_angle / num_steps
+
+        radius = radius
+        center = center
+
+        points = []
+
+        for i in range(num_steps + 1):
+            current_angle = start_angle + (angle_step * i)
+
+            nextx = (center[0] + math.cos(current_angle) * radius)
+            nexty = (center[1] + math.sin(current_angle) * radius)
+
+            points.append((nextx, nexty))
+
+        return points
+
+    def to_primitive(self, units):
+
+        # We start with calculating the top right section, then duplicate it
+
+        inner_radius = self.inner_diameter / 2.0
+        outer_radius = self.outer_diameter / 2.0
+
+        # Calculate the start angle relative to the horizontal axis
+        inner_offset_angle = asin(self.gap / 2.0 / inner_radius)
+        outer_offset_angle = asin(self.gap / 2.0 / outer_radius)
+
+        rotation_rad = math.radians(self.rotation)
+        inner_start_angle = inner_offset_angle + rotation_rad
+        inner_end_angle =  math.pi / 2 - inner_offset_angle + rotation_rad
+
+        outer_start_angle = outer_offset_angle + rotation_rad
+        outer_end_angle = math.pi / 2 - outer_offset_angle + rotation_rad
+
+        outlines = []
+        aperture = Circle((0, 0), 0)
+
+        points = (self._approximate_arc_cw(inner_start_angle, inner_end_angle, inner_radius, self.position)
+                + list(reversed(self._approximate_arc_cw(outer_start_angle, outer_end_angle, outer_radius, self.position))))
+        # Add in the last point since outlines should be closed
+        points.append(points[0])
+
+        # There are four outlines at rotated sections
+        for rotation in [0, 90.0, 180.0, 270.0]:
+
+            lines = []
+            prev_point = rotate_point(points[0], rotation, self.position)
+            for point in points[1:]:
+                cur_point = rotate_point(point, rotation, self.position)
+
+                lines.append(Line(prev_point, cur_point, aperture))
+
+            prev_point = cur_point
+
+            outlines.append(Outline(lines, units=units, level_polarity=self._level_polarity))
+
+        return outlines
+
+
+class AMCenterLinePrimitive(AMPrimitive):
+    """ Aperture Macro Center Line primitive. Code 21.
+
+    The center line primitive is a rectangle defined by its width, height, and center point.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.4:** Center Line, primitive code 21.
+
+    Parameters
+    ----------
+    code : int
+        Center Line Primitive code. Must be 21.
+
+    exposure : str
+        'on' or 'off'
+
+    width : float
+        Width of rectangle
+
+    height : float
+        Height of rectangle
+
+    center : tuple (<float>, <float>)
+        X and Y coordinates of line center
+
+    rotation : float
+        rectangle rotation about its center.
+
+    Returns
+    -------
+    CenterLinePrimitive : :class:`gerber.am_statements.AMCenterLinePrimitive`
+        An initialized AMCenterLinePrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+
+    @classmethod
+    def from_primitive(cls, primitive):
+        width = primitive.width
+        height = primitive.height
+        center = primitive.position
+        rotation = math.degrees(primitive.rotation)
+        return cls(21, 'on', width, height, center, rotation)
+
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(",")
+        code = int(modifiers[0])
+        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
+        width = float(modifiers[2])
+        height = float(modifiers[3])
+        center = (float(modifiers[4]), float(modifiers[5]))
+        rotation = float(modifiers[6])
+        return cls(code, exposure, width, height, center, rotation)
+
+    def __init__(self, code, exposure, width, height, center, rotation):
+        if code != 21:
+            raise ValueError('CenterLinePrimitive code is 21')
+        super(AMCenterLinePrimitive, self).__init__(code, exposure)
+        self.width = width
+        self.height = height
+        validate_coordinates(center)
+        self.center = center
+        self.rotation = rotation
+
+    def to_inch(self):
+        self.center = tuple([inch(x) for x in self.center])
+        self.width = inch(self.width)
+        self.height = inch(self.height)
+
+    def to_metric(self):
+        self.center = tuple([metric(x) for x in self.center])
+        self.width = metric(self.width)
+        self.height = metric(self.height)
+
+    def to_gerber(self, settings=None):
+        data = dict(
+            code=self.code,
+            exposure = '1' if self.exposure == 'on' else '0',
+            width = self.width,
+            height = self.height,
+            center="%.4g,%.4g" % self.center,
+            rotation=self.rotation
+        )
+        fmt = "{code},{exposure},{width},{height},{center},{rotation}*"
+        return fmt.format(**data)
+
+    def to_primitive(self, units):
+
+        x = self.center[0]
+        y = self.center[1]
+        half_width = self.width / 2.0
+        half_height = self.height / 2.0
+
+        points = []
+        points.append((x - half_width, y + half_height))
+        points.append((x - half_width, y - half_height))
+        points.append((x + half_width, y - half_height))
+        points.append((x + half_width, y + half_height))
+
+        aperture = Circle((0, 0), 0)
+
+        lines = []
+        prev_point = rotate_point(points[3], self.rotation, self.center)
+        for point in points:
+            cur_point = rotate_point(point, self.rotation, self.center)
+
+            lines.append(Line(prev_point, cur_point, aperture))
+
+        return Outline(lines, units=units, level_polarity=self._level_polarity)
+
+
+class AMLowerLeftLinePrimitive(AMPrimitive):
+    """ Aperture Macro Lower Left Line primitive. Code 22.
+
+    The lower left line primitive is a rectangle defined by its width, height, and the lower left point.
+
+    .. seealso::
+        `The Gerber File Format Specification <http://www.ucamco.com/files/downloads/file/81/the_gerber_file_format_specification.pdf>`_
+            **Section 4.12.3.5:** Lower Left Line, primitive code 22.
+
+    Parameters
+    ----------
+    code : int
+        Center Line Primitive code. Must be 22.
+
+    exposure : str
+        'on' or 'off'
+
+    width : float
+        Width of rectangle
+
+    height : float
+        Height of rectangle
+
+    lower_left : tuple (<float>, <float>)
+        X and Y coordinates of lower left corner
+
+    rotation : float
+        rectangle rotation about its origin.
+
+    Returns
+    -------
+    LowerLeftLinePrimitive : :class:`gerber.am_statements.AMLowerLeftLinePrimitive`
+        An initialized AMLowerLeftLinePrimitive
+
+    Raises
+    ------
+    ValueError, TypeError
+    """
+    @classmethod
+    def from_gerber(cls, primitive):
+        modifiers = primitive.strip(' *').split(",")
+        code = int(modifiers[0])
+        exposure = 'on' if float(modifiers[1]) == 1 else 'off'
+        width = float(modifiers[2])
+        height = float(modifiers[3])
+        lower_left = (float(modifiers[4]), float(modifiers[5]))
+        rotation = float(modifiers[6])
+        return cls(code, exposure, width, height, lower_left, rotation)
+
+    def __init__(self, code, exposure, width, height, lower_left, rotation):
+        if code != 22:
+            raise ValueError('LowerLeftLinePrimitive code is 22')
+        super (AMLowerLeftLinePrimitive, self).__init__(code, exposure)
+        self.width = width
+        self.height = height
+        validate_coordinates(lower_left)
+        self.lower_left = lower_left
+        self.rotation = rotation
+
+    def to_inch(self):
+        self.lower_left = tuple([inch(x) for x in self.lower_left])
+        self.width = inch(self.width)
+        self.height = inch(self.height)
+
+    def to_metric(self):
+        self.lower_left = tuple([metric(x) for x in self.lower_left])
+        self.width = metric(self.width)
+        self.height = metric(self.height)
+
+    def to_gerber(self, settings=None):
+        data = dict(
+            code=self.code,
+            exposure = '1' if self.exposure == 'on' else '0',
+            width = self.width,
+            height = self.height,
+            lower_left="%.4g,%.4g" % self.lower_left,
+            rotation=self.rotation
+        )
+        fmt = "{code},{exposure},{width},{height},{lower_left},{rotation}*"
+        return fmt.format(**data)
+
+
+class AMUnsupportPrimitive(AMPrimitive):
+    @classmethod
+    def from_gerber(cls, primitive):
+        return cls(primitive)
+
+    def __init__(self, primitive):
+        super(AMUnsupportPrimitive, self).__init__(9999)
+        self.primitive = primitive
+
+    def to_inch(self):
+        pass
+
+    def to_metric(self):
+        pass
+
+    def to_gerber(self, settings=None):
+        return self.primitive