xref: /dports/cad/py-ezdxf/ezdxf-0.16.3/NEWS.md

News
====

Version 0.16.3 - 2021-05-22
---------------------------

- NEW: `ezdxf.tools.text.MTextEditor` class, extracted from the `MText` class
- NEW: `MText.set_bg_color()`, new argument `text_frame` to add a text frame
- CHANGE: move `MText` constants to `MTextEditor` class
- CHANGE: move `MText.set_font()` to `MTextEditor.change_font()`
- CHANGE: move `MText.set_color()` to `MTextEditor.change_color()`
- CHANGE: move `MText.append_stacked_text()` to `MTextEditor.stacked_text()`
- BUGFIX: DXF export of GROUP checks for deleted entities
- BUGFIX: improved virtual DIMENSION handling
- BUGFIX: DIMENSION transformation also transform the content of the
  associated anonymous geometry block content
- BUGFIX: `drawing` add-on, true color values always override ACI colors
- BUGFIX: `drawing` add-on, handle SOLID as OCS entity like TRACE
- BUGFIX/CHANGE: `Vec2/3.__eq__()` (`==` operator) compares
  all components with the full floating point precision, use `Vec2/3.isclose()`
  to take floating point imprecision into account.
  **This is an annoying but necessary change!**
- CHANGE: new signature for `Vec2/3.isclose(other, *, rel_tol=1e-9, abs_tol=1e-12)`,
  new argument `rel_tol`, arguments `rel_tol` and `abs_tol` are keyword only

Version 0.16.2 - 2021-04-21
---------------------------

- CHANGED: `ezdxf.path.add_bezier4p()`, add linear Bezier curve segments as LINE_TO commands
- CHANGED: `ezdxf.path.add_bezier3p()`, add linear Bezier curve segments as LINE_TO commands
- CHANGED: `$FINGERPRINTGUID` matches AutoCAD pattern `{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}`
- CHANGED: `$VERSIONGUID` matches AutoCAD pattern `{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}`
- BUGFIX: check for degenerated Bezier curves in `have_bezier_curves_g1_continuity()`
- BUGFIX: delete and unlink support for DXFTagStorage (unsupported entities)

Version 0.16.1 - 2021-04-10
---------------------------

- BUGFIX: `disassemble.recursive_decompose()` was not recursive
- BUGFIX: `Frontend` font resolver uses XDATA if no regular font file is defined
- BUGFIX: version specific group code for header variable `$XCLIPFRAME`
- BUGFIX: `INSERT` (block reference) transformation

Version 0.16 - 2021-03-27
-------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-16.html
- NEW: `ezdxf` command line launcher, supported commands:
  - `pp` the previous `dxfpp` command, the DXF pretty printer
  - `audit` DXF files
  - `draw` and convert DXF files by the Matplotlib backend
  - `view` DXF files by the PyQt viewer
- NEW: `text2path` add-on to create `Path` objects from text strings and text
  entities, see [docs](https://ezdxf.mozman.at/docs/addons/text2path.html)
- NEW: `bbox` module to detect the extents (bounding boxes) of DXF entities,
  see [docs](https://ezdxf.mozman.at/docs/bbox.html)
- NEW: `zoom` module to reset the active viewport of layouts,
  see [docs](https://ezdxf.mozman.at/docs/zoom.html)
- NEW: `path` sub-package, an extended version of the previous `ezdxf.render.path`
  module, see [docs](https://ezdxf.mozman.at/docs/path.html)
- NEW: support module `disassemble`, see [docs](https://ezdxf.mozman.at/docs/disassemble.html)
  1. deconstruct complex nested DXF entities into a flat sequence
  2. create a "primitive" representation of DXF entities
- NEW: Using the optional `Matplotlib` package by **default** for better font
  metric calculation and font rendering if available.
- NEW: Cached font metrics are loaded at startup, this can be disabled by the
  environment variable `EZDXF_AUTO_LOAD_FONTS=False`, if this slows down the
  interpreter startup too much.
- NEW: `Layout.reset_extents()`, reset layout extents to the given values,
  or the AutCAD default values
- NEW: `Layout.reset_limits()`, reset layout limits to the given values,
  or the AutCAD default values
- NEW: `Paperspace.reset_main_viewport()`, reset the main viewport of a paper
  space layout to custom- or default values
- NEW: quadratic Bézier curve support for the `Path()` class
- NEW: `ezdxf.entity.Text` getter/setter properties `is_backward` and
  `is_upside_down`
- NEW: `ezdxf.entity.TextStyle` getter/setter properties `is_backward`,
  `is_upside_down` and `is_vertical_stacked`
- NEW: `ezdxf.math.Bezier3P`, optimized quadratic Bézier curve construction tool
- NEW: `ezdxf.math.quadratic_to_cubic_bezier()`, `Bezier3P` to `Bezier4P` converter
- NEW: `ezdxf.math.bezier_to_bspline()`, Bézier curves to B-spline converter
- NEW: `ezdxf.math.clip_polygon_2d()`, clip polygon by a convex clipping polygon
- NEW: `ezdxf.math.basic_transformation()`, returns a combined transformation
  matrix for translation, scaling and rotation about the z-axis
- NEW: `ezdxf.math.best_fit_normal()`, returns the normal vector of flat spatial planes
- NEW: `fit_points_to_cubic_bezier()` creates a visual equal SPLINE from fit
  points without end tangents like BricsCAD, but only for short B-splines.
- CHANGED: `fit_points_to_cad_cv()`, removed unused arguments `degree` and `method`
- CHANGED: `ezdxf.render.nesting` content moved into the `ezdxf.path` package
- CHANGED: renamed `MeshBuilder.render()` to `MeshBuilder.render_mesh()`
- CHANGED: `ezdxf.math.BSpline` is immutable, all methods return a new `BSpline` object
- CHANGED: replaced `BSplineU()` class by factory function `ezdxf.math.open_uniform_bspline()`
- CHANGED: replaced `BSplineClosed()` class by factory function `ezdxf.math.closed_uniform_bspline()`
- CHANGED: renamed `rational_spline_from_arc()` to `rational_bspline_from_arc()`
- CHANGED: renamed `rational_spline_from_ellipse()` to `rational_bspline_from_ellipse()`
- BUGFIX: fixed `ezdxf.math.rational_bspline_from_ellipse()` invalid parameter
  conversion
- DEPRECATED: `ezdxf.render.path` module, replaced by `ezdxf.path` package
- DEPRECATED: `Path.from_lwpolyline()`, replaced by factory `path.make_path()`
- DEPRECATED: `Path.from_polyline()`, replaced by factory `path.make_path()`
- DEPRECATED: `Path.from_spline()`, replaced by factory `path.make_path()`
- DEPRECATED: `Path.from_ellipse()`, replaced by factory `path.make_path()`
- DEPRECATED: `Path.from_arc()`, replaced by factory `path.make_path()`
- DEPRECATED: `Path.from_circle()`, replaced by factory `path.make_path()`
- DEPRECATED: `Path.add_curve()`, replaced by function `path.add_bezier4p()`
- DEPRECATED: `Path.add_ellipse()`, replaced by function `path.add_ellipse()`
- DEPRECATED: `Path.add_spline()`, replaced by function `path.add_spline()`
- DEPRECATED: `Path.from_vertices()`, replaced by factory `path.from_vertices()`
- REMOVED: `Path.from_hatch_boundary_path()`, replaced by factory `path.from_hatch()`
- REMOVED: `Path.from_hatch_polyline_path()`
- REMOVED: `Path.from_hatch_edge_path()`
- REMOVED: `BlocksSection.purge()`, unsafe operation
- REMOVED: `dxfpp` command, replaced by `ezdxf pp ...`
- REMOVED: `Layout.add_closed_spline()`, broken and nobody noticed it
- REMOVED: `Layout.add_closed_rational_spline()`, broken and nobody noticed it

Version 0.15.2 - 2021-02-07
---------------------------

- Active Python 3.6 support removed, no tests and no deployment of binary
  wheels for Python 3.6
- NEW: `BoundingBox()` intersection test, inside- and outside tests, union of
  two bounding boxes.
- NEW: `ezdxf.math.ellipse_param_span()`, works the same way as
  `arc_angle_span_deg()` for special cases
- NEW: `DXFEntity.uuid` property, returns an UUID on demand, which allows
  distinguishing even virtual entities without a handle
- CHANGE: extraction of many text utility functions into `ezdxf.tools.text`
- CHANGE: `add_polyline2d()`, `add_polyline3d()`, `add_lwpolyline()` and
  `add_mline()` got argument `close` to create a closed polygon and
  dxfattrib `closed` is deprecated, `close` and `dxfattribs` for these factories
  are keyword only arguments.
- CHANGE: improved text alignment rendering in the drawing add-on
- CHANGE: moved `ezdxf.addons.drawing.fonts.py` into `ezdxf.tools` and added a
  font measurement cache.
- BUGFIX: `FIT` and `ALIGNED` text rendering in the drawing add-on
- BUGFIX: matplotlib backend uses linewidth=0 for solid filled polygons and
  the scaled linewidth for polygons with pattern filling
- BUGFIX: clipping path calculation for IMAGE and WIPEOUT
- BUGFIX: transformation of a closed (360deg) arc preserves a closed arc
- BUGFIX: bulge values near 0 but != 0 caused an exception in `Path.add_2d_polyline()`
- BUGFIX: invalid polygon building in the `geo` add-on

Version 0.15.1 - 2021-01-15
---------------------------

- NEW: `Spline.audit()` audit support for the SPLINE entity
- NEW: The `recover` module tolerates malformed group codes and value tags.
- Changed the `Matrix44.matrix` attribute in the Python implementation to a
  "private" attribute `Matrix44._matrix`, because this attribute is not
  available in the Cython implementation
- BUGFIX: proxy graphic decoding error on big-endian systems
- BUGFIX: invalid vertex subscript access in `dxf2code` add-on
- BUGFIX: `cubic_bezier_from_ellipse()` recognizes full ellipses
- BUGFIX: `cubic_bezier_from_arc()` recognizes full circles
- BUGFIX: pickle support for C-extensions `Vec2`, `Vec3`, `Matrix44` and
  `Bezier4P`
- BUGFIX: attribute error when exporting matrices in the MATERIAL entity

Version 0.15 - 2020-12-30
-------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-15.html
- NEW: linetype support for matplotlib- and pyqt drawing backend
- NEW: HATCH island support for matplotlib- and pyqt drawing backend
- NEW: basic HATCH pattern support for matplotlib- and pyqt drawing backend
- NEW: Font support for matplotlib- and pyqt drawing backend
- NEW: POINT mode support for matplotlib- and pyqt drawing backend, relative
  point size is not supported
- NEW: Proxy graphic support for the drawing add-on
- NEW: recover misplaced tags of the `AcDbEntity` subclass (color, layer,
  linetype, ...), supported by all loading modes
- NEW: `ezdxf.addons.geo` module, support for the
  [`__geo_interface__`](https://gist.github.com/sgillies/2217756),
  see [docs](https://ezdxf.mozman.at/docs/addons/geo.html) and
  [tutorial](https://ezdxf.mozman.at/docs/tutorials/geo.html)
- NEW: `GeoData.setup_local_grid()` setup geo data for CRS similar to EPSG:3395
  World Mercator
- NEW: MLINE support but without line break and fill break (gaps) features
- NEW: `Bezier.flattening()` adaptive recursive flattening (approximation)
- NEW: `Bezier4P.flattening()` adaptive recursive flattening (approximation)
- NEW: `Path.flattening()` adaptive recursive flattening (approximation)
- NEW: `Circle.flattening()` approximation determined by a max. sagitta value
- NEW: `Arc.flattening()` approximation determined by a max. sagitta value
- NEW: `ConstructionArc.flattening()` approximation determined by a max. sagitta value
- NEW: `ezdxf.math.distance_point_line_3d()`
- NEW: `ConstructionEllipse.flattening()` adaptive recursive flattening (approximation)
- NEW: `Ellipse.flattening()` adaptive recursive flattening (approximation)
- NEW: `BSpline.flattening()` adaptive recursive flattening (approximation)
- NEW: `Spline.flattening()` adaptive recursive flattening (approximation)
- NEW: `matplotlib.qsave()`, `ltype` argument to switch between matplotlib dpi
  based linetype rendering and AutoCAD like drawing units based linetype
  rendering
- NEW: `Solid.vertices()` returns OCS vertices in correct order (also `Trace`)
- NEW: `Solid.wcs_vertices()` returns WCS vertices in correct order (also `Trace`)
- NEW: `Face3D.wcs_vertices()` compatibility interface to SOLID and TRACE
- NEW: `Hatch.paths.external_paths()` returns iterable of external boundary paths
- NEW: `Hatch.paths.outermost_paths()` returns iterable of outer most boundary paths
- NEW: `Hatch.paths.default_paths()` returns iterable of default boundary paths
- NEW: `Hatch.paths.rendering_paths()` returns iterable of paths to process for rendering
- NEW: `Drawing.units` property to get/set document/modelspace units
- NEW: `ezdxf.new()` argument `units` to setup document and modelspace units and
  $MEASUREMENT setting and the linetype setup is based on this $MEASUREMENT
  setting.
- NEW: `pattern.load(measurement, factor)` load scaled hatch pattern
- NEW: `Path.from_hatch_boundary_path()`
- NEW: `odafc.export_dwg()` new replace option to delete existing DWG files
- NEW `Style` table entry supports extended font data
- NEW: `Point.virtual_entities()`, yield POINT entities as DXF primitives
- NEW: `ezdxf.render.point`, support module for `Point.virtual_entities()`
- NEW: Optional Cython implementation of some low level math classes:
  Vec2, Vec3, Matrix44, Bezier4P
- NEW: support for complex linetypes for the Importer add-on
- CHANGE: Optimized infrastructure for loading DXF attributes
- CHANGE: `Hatch.set_pattern_fill()` uses HEADER variable $MEASUREMENT to
  determine the default scaling of predefined hatch pattern.
- CHANGE: fix invalid linetype setup - new linetype scaling like common CAD
  applications
- CHANGE: `ezdxf.colors` module will consolidate all color/transparency related
  features
- CHANGE: renamed `ezdxf.math.Vector` to `Vec3`, but `Vector` remains as synonym
- DEPRECATED: `ezdxf.tools.rgb` module replaced by `ezdxf.colors`
- REMOVED: deprecated `DXFEntity.transform_to_wcs()` interface,
  use `DXFEntity.transform(ucs.matrix)`
- REMOVED: deprecated `Hatch.edit_boundary()` context manager,
  use `Hatch.paths` attribute
- REMOVED: deprecated `Hatch.get_gradient()` method,
  use `Hatch.gradient` attribute
- REMOVED: deprecated `Hatch.edit_gradient()` context manager,
  use `Hatch.gradient` attribute
- REMOVED: deprecated `Hatch.edit_pattern()` context manager,
  use `Hatch.pattern` attribute
- REMOVED: deprecated `Hatch.get_seed_points()` method,
  use `Hatch.seeds` attribute
- REMOVED: unnecessary argument `non_uniform_scaling` from `Insert.explode()`
- REMOVED: unnecessary argument `non_uniform_scaling` from
  `Insert.virtual_entities()`
- REMOVED: deprecated `Spline.edit_data()` context manager,
  use `fit_points`, `control_points`, `knots`  and `weights` attributes
- BUGFIX: `ezdxf.math.has_clockwise_orientation()` returns `True` for
  counter-clock wise and vice versa
- BUGFIX: default color for HATCH is 256 (by layer)
- BUGFIX: fixed broken complex linetype setup
- BUGFIX: validate loaded handle seed

Version 0.14.2 - 2020-10-18
---------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-14.html
- BUGFIX: fix invalid attribute reference `self.drawing`

Version 0.14.1 - 2020-09-19
---------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-14.html
- BUGFIX: MLEADER and MLEADERSTYLE min DXF version changed to R2000
- BUGFIX: AutoCAD ignores not existing default objects in ACDBDICTIONARYWDFLT
  and so ezdxf have to. `Auditor()` creates a place holder object as default
  value.

Version 0.14 - 2020-09-12
-------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-14.html
- NEW: DXF attribute setter validation, some special and undocumented Autodesk
  table names may raise `ValueError()` exceptions, please report this table
  names (layers, linetypes, styles, ...). DXF unicode notation "\U+xxxx" raises
  a `ValueError()` if used as resource names like layer name or text style names,
  such files can only be loaded by the new `recover` module.
- NEW: `ezdxf.recover` module to load DXF Documents with structural flaws, see
  [docs](https://ezdxf.mozman.at/docs/drawing/recover.html)
- NEW: All DXF loading functions accept an unicode decoding error handler:
  "surrogateescape", "ignore" or "strict", see [docs](https://ezdxf.mozman.at/docs/drawing/recover.html)
  of the `recover` module for more information.
- NEW: `addons.drawing.Frontend()` supports width attributes of LWPOLYLINE and
  2D POLYLINE entities
- NEW: `TraceBuilder()` a render tool to generate quadrilaterals (TRACE, SOLID
  or 3DFACE), from LWPOLYLINE or 2D POLYLINE with width information,
  see [docs](https://ezdxf.mozman.at/docs/render/trace.html)
- NEW: `Path()` a render tool for paths build of lines and cubic Bezier curves,
  used for faster rendering of LWPOLYLINE, POLYLINE and SPLINE entities for
  render back-ends, see [docs](https://ezdxf.mozman.at/docs/render/path.html)
- NEW: `drawing.matplotlib.qsave()` function, a simplified matplotlib export interface
- NEW: `Arc.construction_tool()` returns the 2D `ConstructionArc()`
- NEW: `Arc.apply_construction_tool()` apply parameters from `ConstructionArc()`
- NEW: `Leader.virtual_entities()` yields 'virtual' DXF primitives
- NEW: `Leader.explode()` explode LEADER as DXF primitives into target layout
- NEW: `LWPolyline.has_width` property is `True` if any width attribute is set
- NEW: `Polyline.has_width` property is `True` if any width attribute is set
- NEW: `Polyline.audit()` extended verify and repair support
- NEW: `Polyline.append_formatted_vertices()`, support for user defined point format
- NEW: `DXFVertex.format()` support for user defined point format
- NEW: `Drawing.blocks.purge()` delete all unused blocks but protect modelspace-
  and paperspace layouts, special arrow blocks and DIMENSION and ACAD_TABLE
  blocks in use, but see also warning in the
  [docs](https://ezdxf.mozman.at/docs/sections/blocks.html)
- NEW: `Insert.explode()` support for MINSERT (multi insert)
- NEW: `Insert.virtual_entities()` support for MINSERT (multi insert)
- NEW: `Insert.mcount` property returns multi insert count
- NEW: `Insert.multi_insert()` yields a virtual INSERT entity for each grid
  element of a MINSERT entity
- NEW: `Layout.add_wipeout()` interface to create WIPEOUT entities
- NEW: `Image.boundary_path_wcs()`, returns boundary path in WCS coordinates
- NEW: `Wipeout.boundary_path_wcs()`, returns boundary path in WCS coordinates
- NEW: `Wipeout.set_masking_area()`
- NEW: `BSpline.is_clamped` property is `True` for a clamped (open) B-spline
- NEW: `UCS.transform()` general transformation interface
- NEW: `Bezier4P.transform()` general transformation interface
- NEW: `Bezier4P.reverse()` returns object with reversed control point order
- NEW: `Bezier.transform()` general transformation interface
- NEW: `Bezier.reverse()` returns object with reversed control point order
- NEW: `has_clockwise_orientation(vertices)` returns `True` if the closed
  polygon of 2D vertices has clockwise orientation
- NEW: `DXFEntity.new_extension_dict()`, create explicit a new extension dictionary
- NEW: `ezdxf.reorder`, support module to implement modified entities redraw order
- NEW: get DXF test file path from environment variable `EZDXF_TEST_FILES`,
  imported automatically as `ezdxf.EZDXF_TEST_FILES`
- NEW: `arc_chord_length()` and `arc_segment_count()` tool functions in
  `ezdxf.math`
- NEW: `Drawing.encode()` to encode unicode strings with correct encoding and
  error handler
- NEW: `ezdxf.has_dxf_unicode()` to detect "\U+xxxx" encoded chars
- NEW: `ezdxf.decode_dxf_unicode()` to decode strings containing
  "\U+xxxx" encoded chars, the new `recover` module decodes such strings
  automatically.
- CHANGE: `DXFEntity.get_extension_dict()`, raises `AttributeError` if entity
  has no extension dictionary
- CHANGE: `DXFEntity.has_extension_dict` is now a property not a method
- CHANGE: `linspace()` uses `Decimal()` for precise calculations, but still
  returns an iterable of `float`
- CHANGE: `Drawing.blocks.delete_all_blocks()`, unsafe mode is disabled and
  argument `safe` is deprecated, will be removed in v0.16
- CHANGE: Dictionary raise `DXFValueError` for adding invalid handles
- CHANGE: `BaseLayout.add_entity()` will bind entity automatically to doc/db if possible
- CHANGE: handle all layout names as case insensitive strings: `Model == MODEL`
- REMOVE: `option.check_entity_tag_structure`, entity check is done only in
  recover mode
- REMOVE: `legacy_mode` in `ezdxf.read()` and `ezdxf.readfile()`, use the
  `ezdxf.recover` module to load DXF Documents with structural flaws
- REMOVE: Alias `DXFEntity.drawing` use `DXFEntity.doc`
- REMOVE: `DXFEntity.entitydb`
- REMOVE: `DXFEntity.dxffactory`
- REMOVE: `DXFInvalidLayerName`, replaced by `DXFValueError`
- REMOVE: `Image.get_boundary_path()`, replaced by property `Image.boundary_path`
- REMOVE: `Image.get_image_def()`, replaced by property `Image.image_def`
- REMOVE: `filter_stack` argument in `ezdxf.read()` and `ezdxf.readfile()`
- BUGFIX: Set `non-constant-attribs` flag (2) in BLOCK at DXF export if non
  constant ATTDEF entities are present.
- BUGFIX: DXF R2018 - `HATCH` extrusion vector (210) is mandatory?
- BUGFIX: Layout names are case insensitive; "MODEL" == "Model"
- BUGFIX: Using "surrogateescape" error handler to preserve binary data in
  ASCII DXF files. Prior versions of ezdxf corrupted this data by using the
  "ignore" error handler; Example file with binary data in XRECORD is not valid
  for TrueView 2020 - so binary data is maybe not allowed.

Version 0.13.1 - 2020-07-18
---------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-13.html
- BUGFIX: remove white space from structure tags like `"SECTION "`
- BUGFIX: `MeshBuilder.from_polyface()` processing error of POLYMESH entities

Version 0.13 - 2020-07-04
-------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-13.html
- NEW: general transformation interface: `DXFGraphic.transform(m)`,
  transform entity by a transformation matrix `m` inplace
- NEW: specialized entity transformation interfaces:
    - `DXFGraphic.translate(dx, dy, dz)`
    - `DXFGraphic.scale(sx, sy, sz)`
    - `DXFGraphic.scale_uniform(s)`
    - `DXFGraphic.rotate_axis(axis, angle)`
    - `DXFGraphic.rotate_x(angle)`
    - `DXFGraphic.rotate_y(angle)`
    - `DXFGraphic.rotate_z(angle)`
- NEW: [drawing](https://ezdxf.mozman.at/docs/addons/draw.html) add-on by Matt Broadway is a translation
  layer to send DXF data to a render backend, supported backends for now:
  [matplotlib](https://pypi.org/project/matplotlib/) and [PyQt5](https://pypi.org/project/PyQt5/), both packages
  are optional and not required to install _ezdxf_.
- NEW: `DXFGraphic.unlink_from_layout()` to unlink entity from associated layout
- NEW: `Arc.angles(num)`, yields `num` angles from start- to end angle in counter clockwise order
- NEW: `Circle.to_ellipse()`, convert CIRCLE/ARC to ELLIPSE entity
- NEW: `Circle.to_spline()`, convert CIRCLE/ARC to SPLINE entity
- NEW: `Ellipse.params(num)`, yields `num` params from start- to end param in counter clockwise order
- NEW: `Ellipse.construction_tool()`, return ellipse data as `ConstructionEllipse()`
- NEW: `Ellipse.apply_construction_tool()`, apply `ConstructionEllipse()` data
- NEW: `Ellipse.to_spline()`, convert ELLIPSE to SPLINE entity
- NEW: `Ellipse.from_arc()`, create a new ELLIPSE entity from CIRCLE or ARC entity (constructor)
- NEW: `Spline.construction_tool()`, return spline data as `ezdxf.math.BSpline()`
- NEW: `Spline.apply_construction_tool()`, apply `ezdxf.math.BSpline()` data
- NEW: `Spline.from_arc()`, create a new SPLINE entity from CIRCLE, ARC or ELLIPSE entity (constructor)
- NEW: `Hatch.set_pattern_scale()` to set scaling of pattern definition
- NEW: `Hatch.set_pattern_angle()` to set rotation angle of pattern definition
- NEW: `Hatch.paths.polyline_to_edge_path()` convert polyline paths with bulge values to edge paths with lines and arcs
- NEW: `Hatch.paths.arc_edges_to_ellipse_edges()` convert arc edges to ellipse edges
- NEW: `Hatch.paths.ellipse_edges_to_spline_edges()` convert ellipse edges to spline edges
- NEW: `Hatch.paths.all_to_spline_edges()` convert all curves to approximated spline edges
- NEW: `Hatch.paths.all_to_line_edges()` convert all curves to approximated line edges
- NEW: `Text.plain_text()` returns text content without formatting codes
- NEW: `ezdxf.math.ConstructionEllipse()`
- NEW: `ezdxf.math.linspace()` like `numpy.linspace()`
- NEW: `ezdxf.math.global_bspline_interpolation()` supports start- and end tangent constraints
- NEW: `ezdxf.math.estimate_tangents()` curve tangent estimator for given fit points
- NEW: `ezdxf.math.estimate_end_tangent_magnitude()` curve end tangent magnitude estimator for given fit points
- NEW: `ezdxf.math.rational_bspline_from_arc()` returns a rational B-spline for a circular arc
- NEW: `ezdxf.math.rational_bspline_from_ellipse()` returns a rational B-spline for an elliptic arc
- NEW: `ezdxf.math.local_cubic_bspline_interpolation()`
- NEW: `ezdxf.math.cubic_bezier_from_arc()` returns an approximation for a circular 2D arc by multiple cubic Bezier curves
- NEW: `ezdxf.math.cubic_bezier_from_ellipse()` returns an approximation for an elliptic arc by multiple cubic Bezier curves
- NEW: `ezdxf.math.cubic_bezier_interpolation()` returns an interpolation curve for arbitrary data points as multiple cubic Bezier curves
- NEW: `ezdxf.math.LUDecomposition` linear equation solver, for more linear algebra tools see module `ezdxf.math.linalg`
- NEW: `ezdxf.render.random_2d_path()` generate random 2D path for testing purpose
- NEW: `ezdxf.render.random_3d_path()` generate random 3D path for testing purpose
- NEW: `BSpline()` uses normalized knot vector for 'clamped' curves by default (open uniform knots)
- NEW: `BSpline.points()` compute multiple points
- NEW: `BSpline.derivative()` compute point and derivative up to n <= degree
- NEW: `BSpline.derivatives()` compute multiple points and derivatives up to n <= degree
- NEW: `BSpline.params()` return evenly spaced B-spline params from start- to end param
- NEW: `BSpline.reverse()` returns a new reversed B-spline
- NEW: `BSpline.from_arc()` B-spline from an arc, best approximation with a minimum number of control points
- NEW: `BSpline.from_ellipse()` B-spline from an ellipse, best approximation with a minimum number of control points
- NEW: `BSpline.from_fit_points()` B-spline from fit points
- NEW: `BSpline.arc_approximation()` B-spline approximation from arc vertices as fit points
- NEW: `BSpline.ellipse_approximation()` B-spline approximation from ellipse vertices as fit points
- NEW: `BSpline.transform()` transform B-spline by transformation matrix inplace
- NEW: `BSpline.transform()` transform B-spline by transformation matrix inplace
- NEW: `BSpline.to_nurbs_python_curve()` and `BSpline.from_nurbs_python_curve()`, interface to
  [NURBS-Python](https://github.com/orbingol/NURBS-Python), `NURBS-Python` is now a testing dependency
- NEW: `BSpline.bezier_decomposition()` decompose a non-rational B-spline into multiple Bezier curves
- NEW: `BSpline.cubic_bezier_approximation()` approximate any B-spline by multiple cubic Bezier curves
- NEW: `Bezier.points()` compute multiple points
- NEW: `Bezier.derivative()` compute point, 1st and 2nd derivative for one parameter
- NEW: `Bezier.derivatives()` compute point and derivative for multiple parameters
- CHANGE: `Hatch` full support for rotated patterns.
- CHANGE: `Hatch.set_pattern_definition()` added argument `angle` for pattern rotation.
- CHANGE: `Hatch.path.add_arc` renamed argument `is_counter_clockwise` to `ccw`, type `bool` and `True` by default
- CHANGE: `Hatch.path.add_ellipse` renamed argument `is_counter_clockwise` to `ccw`, type `bool` and `True` by default
- CHANGE: renamed 2D `ConstructionXXX.move()` methods to `translate()`
- CHANGE: renamed old `Insert.scale()` to `Insert.set_scale()`, name conflict with transformation interface
- CHANGE: renamed `Spline.set_periodic()` to `Spline.set_closed()`
- CHANGE: renamed `Spline.set_periodic_rational()` to `Spline.set_closed_rational()`
- CHANGE: renamed `ezdxf.math.bspline_control_frame()` to `ezdxf.math.global_bspline_interpolation()`
- REMOVED: `ezdxf.math.Matrix33` class, `UCS` and `OCS` uses `Matrix44`for transformations
- REMOVED: `ezdxf.math.BRCS` class and `Insert.brcs()`
- REMOVED: `ezdxf.math.ConstructionTool` base class
- REMOVED: `ezdxf.math.normalize_angle(angle)`, replace call by expression: `angle % math.tau`
- REMOVED: `ezdxf.math.DBSpline`, integrated as `BSpline.derivatives()`
- REMOVED: `ezdxf.math.DBSplineU`, integrated as `BSplineU.derivatives()`
- REMOVED: `ezdxf.math.DBSplineClosed`, integrated as `BSplineClosed.derivatives()`
- REMOVED: `ezdxf.math.DBezier`, integrated as `Bezier.derivatives()`
- REMOVED: `BaseLayout.add_spline_approx()`, incorrect and nobody noticed it - so it's not really needed, if required
  use the `geomdl.fitting.approximate_curve()` function from the package
  [NURBS-Python](https://github.com/orbingol/NURBS-Python), see example `using_nurbs_python.py`
- REMOVED: `ezdxf.math.bspline_control_frame_approx()`, incorrect and nobody noticed it - so it's not really needed
- DEPRECATED: `DXFGraphic.transform_to_wcs(ucs)`, replace call by `DXFGraphic.transform(ucs.matrix)`
- DEPRECATED: `non_uniform_scaling` argument for `Insert.explode()`
- DEPRECATED: `non_uniform_scaling` argument for `Insert.virtual_entities()`
- DEPRECATED: getter and edit methods in `Hatch` for attributes `paths`, `gradient`, `pattern` and `seeds`
- DEPRECATED: `Spline.edit_data()` all attributes accessible by properties
- BUGFIX: `ezdxf.math.intersection_ray_ray_3d()`
- BUGFIX: `Spline.set_periodic()` created invalid data for BricsCAD - misleading information by Autodesk

Version 0.12.5 - 2020-06-05
---------------------------

- BUGFIX: DXF export error for hatches with rational spline edges

Version 0.12.4 - 2020-05-22
---------------------------

- BUGFIX: structure validator for XRECORD

Version 0.12.3 - 2020-05-16
---------------------------

- BUGFIX: DXF R2010+ requires zero length tag 97 for HATCH/SplineEdge if no fit points exist (vshu3000)
- BUGFIX: Export order of XDATA and embedded objects (vshu3000)
- BUGFIX: ATTRIB and ATTDEF did not load basic DXF attributes
- NEW: `BlockLayout()` properties `can_explode` and `scale_uniformly`
- NEW: `Hatch.remove_association()`

Version 0.12.2 - 2020-05-03
---------------------------

- BUGFIX: `XData.get()` now raises `DXFValueError` for not existing appids, like all other methods of the `XData()` class
- BUGFIX: `Layer.description` returns an empty string for unknown XDATA structure in `AcAecLayerStandard`
- BUGFIX: Initialize/Load `Hatch` edge coordinates as `Vec2()` objects
- BUGFIX: typo in 3 point angular dimension subclass marker (vshu3000)
- BUGFIX: HATCH/SplineEdge did export length tag 97 if no fit points exist, creates invalid DXF for AutoCAD/BricsCAD (vshu3000)
- BUGFIX: Ellipse handling in `virtual_block_reference_entities()` (Matt Broadway)

Version 0.12.1 - 2020-04-25
---------------------------

- BUGFIX: fixed uniform scaled ellipse handling in `explode.virtual_block_reference_entities()`
- BUGFIX: fixed crash caused by floating point inaccuracy in `Vector.angle_between()` (Matt Broadway)
- BUGFIX: fixed crash for axis transformation of nearly perpendicular ellipse axis
- BUGFIX: fixed `Hatch.has_critical_elements()`


Version 0.12 - 2020-04-12
-------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-12.html
- NEW: `Insert.block()` returns associated `BlockLayout()` or `None` if block not exist or is an XREF
- NEW: `Insert.has_scaling` returns `True` if any axis scaling is applied
- NEW: `Insert.has_uniform_scaling` returns `True` if scaling is uniform in x-, y- and z-axis.
- NEW: `Insert.scale(factor)` set uniform scaling.
- NEW: `Insert.virtual_entities()` yields 'virtual' entities of a block reference (experimental)
- NEW: `Insert.explode()` explode block reference entities into target layout (experimental)
- NEW: `Insert.add_auto_attribs()` add ATTRIB entities defined as ATTDEF in the block layout and fill tags
        with values defined by a `dict` (experimental)
- NEW: `LWPolyline.virtual_entities()` yields 'virtual' LINE and ARC entities
- NEW: `LWPolyline.explode()` explode LWPOLYLINE as LINE and ARC entities into target layout
- NEW: `Polyline.virtual_entities()` yields 'virtual' LINE, ARC or 3DFACE entities
- NEW: `Polyline.explode()` explode POLYLINE as LINE, ARC or 3DFACE entities into target layout
- NEW: `Dimension.virtual_entities()` yields 'virtual' DXF entities
- NEW: `Dimension.explode()` explode DIMENSION as basic DXF entities into target layout
- NEW: `Dimension.transform_to_wcs()` support for UCS based entity transformation
- NEW: `Dimension.override()` returns `DimStyleOverride()` object
- NEW: `Dimension.render()` render graphical representation as anonymous block
- NEW: `Block()` properties `is_anonymous`, `is_xref` and `is_xref_overlay`
- NEW: `R12FastStreamWriter.add_polyline_2d()`, add 2D POLYLINE with start width, end width and bulge value support
- NEW: `Ellipse.minor_axis` property returns minor axis as `Vector`
- NEW: Option `ezdxf.options.write_fixed_meta_data_for_testing`, writes always same timestamps and GUID
- NEW: Support for loading and exporting proxy graphic encoded as binary data, by default disabled
- NEW: `ezdxf.proxygraphic.ProxyGraphic()` class to examine binary encoded proxy graphic (Need more example data
        for testing!)
- NEW: Get/set hyperlink for graphic entities
- NEW: `odafc` add-on to use an installed ODA File Converter for reading and writing DWG files
- NEW: Support for reading and writing Binary DXF files
- NEW: Binary DXF support for `r12writer` add-on
- CHANGE: `R12FastStreamWriter.add_polyline()`, add 3D POLYLINE only, closed flag support
- CHANGE: renamed `Insert.ucs()` to `Insert.brcs()` which now returns a `BRCS()` object
- CHANGE: `Polyline.close()`, `Polyline.m_close()` and `Polyline.n_close()` can set and **clear** closed state.
- BUGFIX: `Dimension.destroy()` should not not destroy associated anonymous block, because if DIMENSION is used in a
          block, the anonymous block may be used by several block references
- BUGFIX: floating point precision error in `intersection_line_line_2d()`
- BUGFIX: attribute error in `Polyline.transform_to_wcs()` for 2d polylines
- BUGFIX: LWPOLYLINE was always exported with `const_width=0`
- BUGFIX: `Face3d.set_edge_visibility()` set inverted state (visible <-> invisible)
- BUGFIX: Load `AcDbEntity` group codes from base class

Version 0.11.2 - 2020-04-03
---------------------------

- BUGFIX: upgrade error from DXF R13/14 to R2000

Version 0.11.1 - 2020-02-29
---------------------------

- NEW: `Meshbuilder.from_polyface()` to interface to `POLYFACE` and `POLYMESH`
- NEW: `Meshbuilder.render_polyface()` create `POLYFACE` objects
- NEW: `MeshAverageVertexMerger()` an extended version of `MeshVertexMerger()`, location of merged vertices
  is the average location of all vertices with the same key
- NEW: `ezdxf.addons.iterdxf` iterate over modelspace entities of really big DXF files (>1 GB) without loading
  them into memory
- NEW: `ezdxf.addons.r12writer` supports `POLYFACE` and `POLYMESH` entities
- NEW: `Layout.add_foreign_entity()` copy/move **simple** entities from another DXF document or add unassigned
  DXF entities to a layout
- NEW: `MText.plain_text()` returns text content without formatting codes
- CHANGE: refactor Auditor() into a DXF document fixer, fixes will be applied automatically (work in progress)
- CHANGE: moved `r12writer` into `addons` subpackage
- CHANGE: moved `acadctb` into `addons` subpackage

Version 0.11 - 2020-02-15
-------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-11.html
- Using standard git branches:
  - `master`: development state
  - `stable`: latest stable release
- Requires Python 3.6
- NEW: `Dimension.get_measurement()` supports angular, angular3p and ordinate dimensions
- NEW: `Layout.add_radius_dim()` implemented
- NEW: shortcut calls `Layout.add_radius_dim_2p()` and `Layout.add_radius_dim_cra()`
- NEW: `Layout.add_diameter_dim()` implemented
- NEW: shortcut `Layout.add_diameter_dim_2p()`
- NEW: `Circle.vertices(angles)` yields vertices for iterable angles in WCS
- NEW: `Ellipse.vertices(params)` yields vertices for iterable params in WCS
- NEW: Arc properties `start_point` and `end_point` returns start- and end point of arc in WCS
- NEW: Ellipse properties `start_point` and `end_point` returns start- and end point of ellipse in WCS
- NEW: user defined point format support for 2d POLYLINE entities:
  `add_polyline2d([(1, 2, 0.5), (3, 4, 0)], format='xyb')`
- NEW: `Polyline.append_formatted_points()` with user defined point format support
- NEW: `Drawing.set_modelspace_vport(height, center)` set initial view/zoom location for the modelspace
- NEW: support for associating HATCH boundary paths to geometry entities
- NEW: `Drawing.output_encoding` returns required output encoding
- NEW: User Coordinate System (UCS) based entity transformation, allows to work with UCS coordinates, which are
  simpler if the UCS is chosen wisely, and transform them later into WCS coordinates. Entities which have a
  `transform_to_wcs(ucs)` method, automatically take advantage of the new UCS transformation methods, but not all entity
  types are supported, embedded ACIS entities like 3DSOLID, REGION, SURFACE and so on, do not expose their geometry.
- NEW: `transform_to_wcs(ucs)` implemented for: 3DFACE, ARC, ATTDEF, ATTRIB, CIRCLE, ELLIPSE, HATCH, IMAGE, INSERT,
  LEADER, LINE, LWPOLYLINE, MESH, MTEXT, POINT, POLYLINE, RAY, SHAPE, SOLID, SPLINE, TEXT, TRACE, XLINE
- NEW: `UCS.rotate(axis, angle)` returns a new UCS rotated around WCS vector `axis`
- NEW: `UCS.rotate_local_x(angle)` returns a new UCS rotated around local x-axis
- NEW: `UCS.rotate_local_y(angle)` returns a new UCS rotated around local y-axis
- NEW: `UCS.rotate_local_z(angle)` returns a new UCS rotated around local z-axis
- NEW: `UCS.copy()` returns a new copy of UCS
- NEW: `UCS.shift(delta)` shifts UCS inplace by vector `delta`
- NEW: `UCS.moveto(location)` set new UCS origin to `location` inplace
- NEW: `size` and `center` properties for bounding box classes
- NEW: `Insert.ucs()` returns an UCS placed in block reference `insert` location, UCS axis aligned to the block axis.
- NEW: `Insert.reset_transformation()` reset block reference location, rotation and extrusion vector.
- CHANGE: renamed `ezdxf.math.left_of_line` to `ezdxf.math.is_point_left_of_line`
- NEW: `ezdxf.math.point_to_line_relation()` 2D function returns `-1` for left oft line, `+1` for right oif line , `0` on the line
- NEW: `ezdxf.math.is_point_on_line_2d()` test if 2D point is on 2D line
- NEW: `ezdxf.math.distance_point_line_2d()` distance of 2D point from 2D line
- NEW: `ezdxf.math.is_point_in_polygon_2d()` test if 2D point is inside of a 2D polygon
- NEW: `ezdxf.math.intersection_line_line_2d()` calculate intersection for 2D lines
- NEW: `ezdxf.math.offset_vertices_2d()` calculate 2D offset vertices for a 2D polygon
- NEW: `ezdxf.math.normal_vector_3p()` returns normal vector for 3 points
- NEW: `ezdxf.math.is_planar_face()` test if 3D face is planar
- NEW: `ezdxf.math.subdivide_face()` linear subdivision for 2D/3D faces/polygons
- NEW: `ezdxf.math.intersection_ray_ray_3d()` calculate intersection for 3D rays
- NEW: `ezdxf.math.Plane()` 3D plane construction tool
- NEW: `ezdxf.render.MeshTransformer()` inplace mesh transformation class, subclass of `MeshBuilder()`
- NEW: `MeshBuilder.render()` added UCS support
- NEW: `MeshBuilder.render_normals()` render face normals as LINE entities, useful to check face orientation
- NEW: `ezdxf.render.forms.cone_2p()` create 3D cone mesh from two points
- NEW: `ezdxf.render.forms.cylinder_2p()` create 3D cylinder mesh from two points
- NEW: `ezdxf.render.forms.sphere()` create 3D sphere mesh
- NEW: `pycsg` add-on, a simple Constructive Solid Geometry (CSG) kernel created by Evan Wallace (Javascript) and
  Tim Knip (Python)
- CHANGE: Changed predefined pattern scaling to BricsCAD and AutoCAD standard, set global option
  `ezdxf.options.use_old_predefined_pattern_scaling` to True, to use the old pattern scaling before v0.11
- CHANGE: removed `ezdxf.PATTERN` constant, use `PATTERN = ezdxf.pattern.load()` instead, set argument
  `old_pattern=True` to use the old pattern scaling before v0.11
- CHANGE: `Table.key()` accepts only strings, therefore tables check `in` accepts also only strings
  like `entity.dxf.name`
- NEW: load DXF comments from file (`ezdxf.comments.from_file`) or stream (`ezdxf.comments.from_stream`)
- BUGFIX: fixed incorrect HATCH pattern scaling
- BUGFIX: fixed base point calculation of aligned dimensions
- BUGFIX: fixed length extension line support for linear dimensions
- BUGFIX: `UCS.to_ocs_angle_deg()` and `UCS.to_ocs_angle_rad()`
- BUGFIX: check for unsupported DXF versions at `new()`
- BUGFIX: fixed dxf2src error for the HATCH entity
- BUGFIX: `is_point_left_of_line()` algorithm was incorrect
- BUGFIX: default `dimtxsty` is `Standard` if `options.default_dimension_text_style` is not defined
- BUGFIX: default arrows for minimal defined dimstyles are closed filled arrows
- BUGFIX: use `Standard` as default for undefined dimension styles, e.g. `EZDXF` without setup

Version 0.10.4 - 2020-01-31
---------------------------

- BUGFIX: height group code (40) for TEXT, ATTRIB and ATTDEF is mandatory

Version 0.10.3 - 2020-01-29
---------------------------

- BUGFIX: min DXF version for VISUALSTYLE object is R2000

Version 0.10.2 - 2019-10-05
---------------------------

- NEW: `Dimension.get_measurement()` returns the actual dimension measurement in WCS units, no scaling applied; angular
  and ordinate dimension are not supported yet.
- BUGFIX: ordinate dimension exports wrong feature location
- BUGFIX: `Hatch.set_pattern_fill()` did not set pattern scale, angle and double values

Version 0.10.1 - 2019-09-07
---------------------------

- BUGFIX: group code for header var $ACADMAINTVER is 90 for DXF R2018+ and 70 for previous DXF versions. This is a
  critical bug because AutoCAD 2012/2013 (and possibly earlier versions) will not open DXF files with the new group
  code 90 for header variable $ACADMAINTVER.

Version 0.10 - 2019-09-01
-------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-10.html
- unified entity system for all DXF versions
- saving as later DXF version than the source DXF version is possible, but maybe data loss if saving as an older DXF
  version than source DXF version (_ezdxf_ is not a DXF converter)
- templates no more needed and removed from package
- CHANGE: `DXFEntity`
    - renamed `DXFEntity.drawing` to `DXFEntity.doc`
    - `DXFEntity.get_xdata()` keyword `xdata_tag` renamed to `tags`
    - `DXFEntity.set_xdata()` keyword `xdata_tag` renamed to `tags`
    - renamed `DXFEntity.remove_reactor_handle()` renamed to `DXFEntity.discard_reactor_handle()`
    - `DXFEntity.get_extension_dict()` returns `ExtensionDict` object instead of the raw DICTIONARY object
    - renamed `DXFEntity.supports_dxf_attrib()` to `DXFEntity.is_supported_dxf_attrib()`
    - renamed `DXFEntity.dxf_attrib_exists()` to `DXFEntity.has_dxf_attrib()`
- CHANGE: `Layer` entity
    - removed `Layer.dxf.line_weight` as synonym for `Layer.dxf.lineweight`
    - renamed `Layer.dxf.plot_style_name` to `Layer.dxf.plotstyle_handle`
    - renamed `Layer.dxf.material` to `Layer.dxf.material_handle`
- CHANGE: same treatment of `Viewport` entity for all DXF versions
- CHANGE: `Polyline.vertices()` is now an attribute `Polyline.vertices`, implemented as regular Python list.
- CHANGE: `Insert.attribs()` is now an attribute `Insert.attribs`, implemented as regular Python list.
- CHANGE: renamed `Viewport.dxf.center_point` to `Viewport.dxf.center`
- CHANGE: renamed `Viewport.dxf.target_point` to `Viewport.dxf.target`
- CHANGE: direct access to hatch paths (`Hatch.paths`), pattern (`Hatch.pattern`) and gradient (`Hatch.gradient`),
          context manager to edit this data is not needed anymore, but still available for backward compatibility
- CHANGE: Options
    - removed `template_dir`, no more needed
    - new `log_unprocessed_tags` to log unprocessed (unknown) DXF tags
- CHANGE: `Dimension()` removes associated anonymous dimension block at deletion
- CHANGE: safe block deletion protects not explicit referenced blocks like anonymous dimension blocks and arrow blocks
- CHANGE: `Importer` add-on rewritten, API incompatible to previous ezdxf versions, but previous implementation was
          already broken
- CHANGE: moved `add_attdef()` to generic layout interface, adding ATTDEF to model- and paperspace is possible
- CHANGE: entity query - exclude DXF types from `'*'` search, by appending type name with a preceding '!' e.g. query for
  all entities except LINE = `"* !LINE"`
- CHANGE: entity query - removed regular expression support for type name match
- CHANGE: integration of `MTextData` methods into `MText`
- CHANGE: removed  `edit_data`, `get_text`, `set_text` methods from `MText`
- restructured package, module and test file organization
- NEW: support for `Layer.dxf.true_color` and `Layer.dxf.transparency` attributes (DXF R2004+, undocumented)
- NEW: `Layer.rgb`, `Layer.color`, `Layer.description` and `Layer.transparency` properties
- NEW: renaming a `Layer` also renames references to this layer, but use with care
- NEW: support for adding LEADER entities
- NEW: `Dimension.get_geometry_block()`, returns the associated anonymous dimension block or `None`
- NEW: `EntityQuery()` got `first` and `last` properties, to get first or last entity or `None` if query result is empty
- NEW: added `ngon()`, `star()` and `gear()` to `ezdxf.render.forms`
- NEW: Source code generator to create Python source code from DXF entities, to recreate this entities by _ezdxf_.
  This tool creates only simple structures as a useful starting point for parametric DXF entity creation from existing
  DXF files. Not all DXF entities are supported!
- NEW: support for named plot style files (STB)
- NEW: can open converted Gerber DXF files tagged as "Version 1.0, Gerber Technology."
- BUGFIX: fixed MTEXT and GEODATA text splitting errors (do not split at '^')
- BUGFIX: fixed some subclass errors, mostly DXF reference errors
- BUGFIX: VERTEX entity inherit `owner` and `linetype` attribute from POLYLINE entity
- BUGFIX: MTEXT - replacement of `\n` by `\P` at DXF export to avoid invalid DXF files.
- tested with CPython 3.8
- removed batch files (.bat) for testing, use `tox` command instead

Version 0.9 - 2019-02-24
------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-9.html
- IMPORTANT: Python 2 support REMOVED, if Python 2 support needed: add `ezdxf<0.9` to your `requirements.txt`
- NEW: testing on Manjaro Linux in a VM by tox
- CHANGE: converted NEWS.rst to NEWS.md and README.rst to README.md
- CHANGE: moved `Importer()` from `ezdxf.tools` to `ezdxf.addons` - internal structures of modern DXF files are too complex
  and too undocumented to support importing data in a reliable way - using `Importer()` may corrupt your DXF files or just
  don't work!
- NEW: type annotations to core package and add-ons.
- NEW: argument `setup` in `ezdxf.new('R12', setup=True)` to setup default line types, text styles and dimension styles,
  this feature is disabled by default.
- NEW: Duplicate table entries: `dwg.styles.duplicate_entry('OpenSans', new_name='OpenSansNew')`, this works for
  all tables, but is intended to duplicate STYLES and DIMSTYLES.
- CHANGED: replaced proprietary fonts in style declarations by open source fonts
- NEW: open source fonts to download https://github.com/mozman/ezdxf/tree/master/fonts
- __OpenSansCondensed-Light__ font used for default dimension styles
- NEW: subpackage `ezdxf.render`, because of DIMENSION rendering
- NEW: support for AutoCAD standard arrows
- NEW: support for creating linear DIMENSION entities
- NEW: background color support for MTEXT
- CHANGE: DXF template cleanup, removed non standard text styles, dimension styles, layers and blocks
- CHANGE: text style STANDARD uses `txt` font
- CHANGE: renamed subpackage `ezdxf.algebra` to `ezdxf.math`
- CHANGE: moved `addons.curves` to `render.curves`
- CHANGE: moved `addons.mesh` to `render.mesh`
- CHANGE: moved `addons.r12spline` to `render.r12spline`
- CHANGE: moved `addons.forms` to `render.forms`
- CHANGE: renamed construction helper classes into Construction...()
  - `Ray2D()` renamed to `ConstructionRay()`
  - `Circle()` renamed to `ConstructionCircle()`
  - `Arc()` renamed to `ConstructionArc()`
- NEW: construction tools `ConstructionLine()` and `ConstructionBox()`
- REMOVED: `almost_equal` use `math.isclose`
- REMOVED: `almost_equal_points` use `ezdxf.math.is_close_points`
- BUGFIX: closed LWPOLYLINE did not work in AutoCAD (tag order matters), introduced with v0.8.9 packed data structure
- BUGFIX: `UCS.to_ocs_angle_deg()` corrected

Version 0.8.9 - 2018-11-28
--------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-8-9.html
- IMPORTANT: Python 2 support will be dropped in ezdxf v0.9.0, because Python 2 support get more and more annoying.
- CHANGE: refactoring of internal tag representation for a smaller memory footprint, but with some speed penalty
- NEW: packed data for LWPOLYLINE points, faster `__getitem__`;  added `__setitem__`, `__delitem__`, `insert()` and
  `append()` methods; renamed `discard_points()` in `clear()`; removed `get_rstrip_points()` and ctx manager
  `rstrip_points()`; user defined point format;
- NEW: packed data for SPLINE, knots, weights, fit- and control points are stored as `array.array()`;
  `Spline.get_knot_values()`, `Spline.get_weights()`, `Spline.get_control_points()` and `Spline.get_fit_points()` are
  deprecated, direct access to this attributes by `Spline.knot_values`, `Spline.weights`, `Spline.control_points` and
  `Spline.fit_points`, all attributes with a list-like interface. Knot, control point and fit point counter updated
  automatically, therefore counters are read only now.
- NEW: packed data for MESH, vertices, faces, edges and edge crease values stored as `array.array()`, high level interface unchanged
- NEW: `Drawing.layouts_and_blocks()`, iterate over all layouts (mode space and paper space) and all block definitions.
- NEW: `Drawing.chain_layouts_and_blocks()`, chain entity spaces of all layouts and blocks. Yields an iterator for all
  entities in all layouts and blocks
- NEW: `Drawing.query()`, entity query over all layouts and blocks
- NEW: `Drawing.groupby()`, groups DXF entities of all layouts and blocks by an DXF attribute or a key function
- NEW: `Layout.set_redraw_order()` and `Layout.get_redraw_order()`, to change redraw order of entities in model space and
  paper space layouts
- NEW: `BlockLayout.is_layout_block`, `True` if block is a model space or paper space block definition
- NEW: `ezdxf.algebra.Arc` helper class to create arcs from 2 points and an angle or radius, or from 3 points
- NEW: `ezdxf.algebra.Arc.add_to_layout()` with UCS support to create 3D arcs
- NEW: rename paper space layouts by `Drawing.layouts.rename(old_name, new_name)`
- NEW: Basic support for embedded objects (new in AutoCAD 2018), ezdxf reads and writes the embedded data as it is,
  no interpretation no modification, just enough to not break DXF files with embedded objects at saving.
- CHANGE: `Drawing.blocks.delete_block(name, safe=True)`, new parameter save, check if block is still referenced
  (raises `DXFValueError`)
- CHANGE: `Drawing.blocks.delete_all_blocks(safe=True)`, if parameter safe is `True`, do not delete blocks that are still referenced
- BUGFIX: invalid CLASS definition for DXF version R2000 (AC1015) fixed, bug was only triggered at upgrading from R13/R14 to R2000
- BUGFIX: fixed broken `Viewport.AcDbViewport` property
- __BASIC__ read support for many missing DXF entities/objects

    - ACAD_PROXY_GRAPHIC
    - HELIX
    - LEADER
    - LIGHT
    - MLEADER (incomplete)
    - MLINE (incomplete)
    - OLEFRAME
    - OLE2FRAME
    - SECTION
    - TABLE (incomplete)
    - TOLERANCE
    - WIPEOUT
    - ACAD_PROXY_OBJECT
    - DATATABLE
    - DICTIONARYVAR
    - DIMASSOC
    - FIELD (incomplete)
    - FIELDLIST (not documented by Autodesk)
    - IDBUFFER
    - LAYER_FILTER
    - MATERIAL
    - MLEADERSTYLE
    - MLINESTYLE
    - SORTENTSTABLE
    - SUN
    - SUNSTUDY (incomplete) (no real world DXF files with SUNSTUDY for testing available)
    - TABLESTYLE (incomplete)
    - VBA_PROJECT (no real world DXF files with embedded VBA for testing available)
    - VISUALSTYLE
    - WIPEOUTVARIABLES
    - for all unsupported entities/objects exist only raw DXF tag support

Version 0.8.8 - 2018-04-02
--------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-8-8.html
- NEW: read/write support for GEODATA entity
- NEW: read/(limited)write support for SURFACE, EXTRUDEDSURFACE, REVOLVEDSURFACE, LOFTEDSURFACE and SWEPTSURFACE entity
- NEW: support for extension dictionaries
- NEW: `add_spline_control_frame()`, create and add B-spline control frame from fit points
- NEW: `add_spline_approx()`, approximate B-spline by a reduced count of control points
- NEW: `ezdxf.setup_linetypes(dwg)`, setup standard line types
- NEW: `ezdxf.setup_styles(dwg)`, setup standard text styles
- NEW: `LWPolyline.vertices()` yields all points as `(x, y)` tuples in OCS, `LWPolyline.dxf.elevation` is the z-axis value
- NEW: `LWPolyline.vertices_in_wcs()` yields all points as `(x, y, z)` tuples in WCS
- NEW: basic `__str__()`  and `__repr__()` support for DXF entities, returns just DXF type and handle
- NEW: bulge related function in module `ezdxf.algebra.bulge`
- NEW: Object Coordinate System support by `DXFEntity.ocs()` and `OCS()` class in module ezdxf.algebra
- NEW: User Coordinate System support by `UCS()` class in module `ezdxf.algebra`
- CHANGE: `DXFEntity.set_app_data()` and `Entity.set_xdata` accept also list of tuples as tags, `DXFTag()` is not required
- BUGFIX: entity structure validator excepts group code >= 1000 before XDATA section (used in AutoCAD Civil 3D and AutoCAD Map 3D)

Version 0.8.7 - 2018-03-04
--------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-8-7.html
- NEW: entity.get_layout() returns layout in which entity resides or None if unassigned
- NEW: copy any DXF entity by entity.copy() without associated layout, add copy to any layout you want, by
  layout.add_entity().
- NEW: copy entity to another layout by entity.copy_to_layout(layout)
- NEW: move entity from actual layout to another layout by entity.move_to_layout(layout)
- NEW: support for splines by control points: add_open_spline(), add_closed_spline(), add_rational_spline(),
  add_closed_rational_spline()
- NEW: bspline_control_frame() calculates B-spline control points from fit points, but not the same as AutoCAD
- NEW: R12Spline add-on, 2d B-spline with control frame support by AutoCAD, but curve is just an approximated POLYLINE
- NEW: added entity.get_flag_state() and entity.set_flag_state() for easy access to binary coded flags
- NEW: set new $FINGERPRINTGUID for new drawings
- NEW: set new $VERSIONGUID on saving a drawing
- NEW: improved IMAGE support, by adding RASTERVARIABLES entity, use Drawing.set_raster_variables(frame, quality, units)
- BUGFIX: closing user defined image boundary path automatically, else AutoCAD crashes

Version 0.8.6 - 2018-02-17
--------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-8-6.html
- NEW: ezdxf project website: https://ezdxf.mozman.at/
- CHANGE: create all missing tables of the TABLES sections for DXF R12
- BUGFIX: entities on new layouts will be saved
- NEW: Layout.page_setup() and correct 'main' viewport for DXF R2000+; For DXF R12 page_setup() exists, but does not
  provide useful results. Page setup for DXF R12 is still a mystery to me.
- NEW: Table(), MText(), Ellipse(), Spline(), Bezier(), Clothoid(), LinearDimension(), RadialDimension(),
  ArcDimension() and AngularDimension() composite objects from dxfwrite as add-ons, these add-ons support DXF R12
- NEW: geometry builder as add-ons: MeshBuilder(), MeshVertexMerger(), MengerSponge(), SierpinskyPyramid(), these
  add-ons require DXF R2000+ (MESH entity)
- BUGFIX: fixed invalid implementation of context manager for r12writer

Version 0.8.5 - 2018-01-28
--------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-8-5.html
- CHANGE: block names are case insensitive 'TEST' == 'Test' (like AutoCAD)
- CHANGE: table entry (layer, linetype, style, dimstyle, ...) names are case insensitive 'TEST' == 'Test' (like AutoCAD)
- CHANGE: raises DXFInvalidLayerName() for invalid characters in layer names: <>/\":;?*|=`
- CHANGE: audit process rewritten
- CHANGE: skip all comments, group code 999
- CHANGE: removed compression for unused sections (THUMBNAILSECTION, ACDSDATA)
- NEW: write DXF R12 files without handles: set dwg.header['$HANDLING']=0, default value is 1
- added subclass marker filter for R12 and prior files in legacy_mode=True (required for malformed DXF files)
- removed special check for Leica Disto Unit files, use readfile(filename, legacy_mode=True) (malformed DXF R12 file,
  see previous point)

Version 0.8.4 - 2018-01-14
--------------------------

- Release notes: https://ezdxf.mozman.at/release-v0-8-4.html
- NEW: Support for complex line types with text or shapes
- NEW: DXF file structure validator at SECTION level, tags outside of sections will be removed
- NEW: Basic read support for DIMENSION
- CHANGE: improved exception management, in the future ezdxf should only raise exceptions inherited from DXFError for
  DXF related errors, previous exception classes still work

    - DXFValueError(DXFError, ValueError)
    - DXFKeyError(DXFError, KeyError)
    - DXFAttributeError(DXFError, AttributeError)
    - DXFIndexError(DXFError, IndexError)
    - DXFTableEntryError(DXFValueError)

- speedup low level tag reader around 5%, and speedup tag compiler around 5%

Version 0.8.3 - 2018-01-02
--------------------------

- CHANGE: Lwpolyline - suppress yielding z coordinates if they exists (DXFStructureError: z coordinates are not defined in the DXF standard)
- NEW: setup creates a script called 'dxfpp' (DXF Pretty Printer) in the Python script folder
- NEW: basic support for DXF format AC1032 introduced by AutoCAD 2018
- NEW: ezdxf use logging and writes all logs to a logger called 'ezdxf'. Logging setup is the domain of the application!
- NEW: warns about multiple block definitions with the same name in a DXF file. (DXFStructureError)
- NEW: legacy_mode parameter in ezdxf.read() and ezdxf.readfile(): tries do fix coordinate order in LINE
  entities (10, 11, 20, 21) by the cost of around 5% overall speed penalty at DXF file loading

Version 0.8.2 - 2017-05-01
--------------------------

- NEW: Insert.delete_attrib(tag) - delete ATTRIB entities from the INSERT entity
- NEW: Insert.delete_all_attribs() - delete all ATTRIB entities from the INSERT entity
- BUGFIX: setting attribs_follow=1 at INSERT entity before adding an attribute entity works

Version 0.8.1 - 2017-04-06
--------------------------

- NEW: added support for constant ATTRIB/ATTDEF to the INSERT (block reference) entity
- NEW: added ATTDEF management methods to BlockLayout (has_attdef, get_attdef, get_attdef_text)
- NEW: added (read/write) properties to ATTDEF/ATTRIB for setting flags (is_const, is_invisible, is_verify, is_preset)

Version 0.8.0 - 2017-03-28
--------------------------

- added groupby(dxfattrib='', key=None) entity query function, it is supported by all layouts and the query result
  container: Returns a dict, where entities are grouped by a dxfattrib or the result of a key function.
- added ezdxf.audit() for DXF error checking for drawings created by ezdxf - but not very capable yet
- dxfattribs in factory functions like add_line(dxfattribs=...), now are copied internally and stay unchanged, so they
  can be reused multiple times without getting modified by ezdxf.
- removed deprecated Drawing.create_layout() -> Drawing.new_layout()
- removed deprecated Layouts.create() -> Layout.new()
- removed deprecated Table.create() -> Table.new()
- removed deprecated DXFGroupTable.add() -> DXFGroupTable.new()
- BUGFIX in EntityQuery.extend()

Version 0.7.9 - 2017-01-31
--------------------------

- BUGFIX: lost data if model space and active layout are called \*MODEL_SPACE and \*PAPER_SPACE

Version 0.7.8 - 2017-01-22
--------------------------

- BUGFIX: HATCH accepts SplineEdges without defined fit points
- BUGFIX: fixed universal line ending problem in ZipReader()
- Moved repository to GitHub: https://github.com/mozman/ezdxf.git

Version 0.7.7 - 2016-10-22
--------------------------

- NEW: repairs malformed Leica Disto DXF R12 files, ezdxf saves a valid DXF R12 file.
- NEW: added Layout.unlink(entity) method: unlinks an entity from layout but does not delete entity from the drawing database.
- NEW: added Drawing.add_xref_def(filename, name) for adding external reference definitions
- CHANGE: renamed parameters for EdgePath.add_ellipse() - major_axis_vector -> major_axis; minor_axis_length -> ratio
  to be consistent to the ELLIPSE entity
- UPDATE: Entity.tags.new_xdata() and Entity.tags.set_xdata() accept tuples as tags, no import of DXFTag required
- UPDATE: EntityQuery to support both 'single' and "double" quoted strings - Harrison Katz <harrison@neadwerx.com>
- improved DXF R13/R14 compatibility

Version 0.7.6 - 2016-04-16
--------------------------

* NEW: r12writer.py - a fast and simple DXF R12 file/stream writer. Supports only LINE, CIRCLE, ARC, TEXT, POINT,
  SOLID, 3DFACE and POLYLINE. The module can be used without ezdxf.
* NEW: Get/Set extended data on DXF entity level, add and retrieve your own data to DXF entities
* NEW: Get/Set app data on DXF entity level (not important for high level users)
* NEW: Get/Set/Append/Remove reactors on DXF entity level (not important for high level users)
* CHANGE: using reactors in PdfDefinition for well defined UNDERLAY entities
* CHANGE: using reactors and IMAGEDEF_REACTOR for well defined IMAGE entities
* BUGFIX: default name=None in add_image_def()

Version 0.7.5 - 2016-04-03
--------------------------

* NEW: Drawing.acad_release property - AutoCAD release number for the drawing DXF version like 'R12' or 'R2000'
* NEW: support for PDFUNDERLAY, DWFUNDERLAY and DGNUNDERLAY entities
* BUGFIX: fixed broken layout setup in repair routine
* BUGFIX: support for utf-8 encoding on saving, DXF R2007 and later is saved with UTF-8 encoding
* CHANGE: Drawing.add_image_def(filename, size_in_pixel, name=None), renamed key to name and set name=None for auto-generated internal image name
* CHANGE: argument order of Layout.add_image(image_def, insert, size_in_units, rotation=0., dxfattribs=None)

Version 0.7.4 - 2016-03-13
--------------------------

* NEW: support for DXF entity IMAGE (work in progress)
* NEW: preserve leading file comments (tag code 999)
* NEW: writes saving and upgrading comments when saving DXF files; avoid this behavior by setting options.store_comments = False
* NEW: ezdxf.new() accepts the AutoCAD release name as DXF version string e.g. ezdxf.new('R12') or R2000, R2004, R2007, ...
* NEW: integrated acadctb.py module from my dxfwrite package to read/write AutoCAD .ctb config files; no docs so far
* CHANGE: renamed Drawing.groups.add() to new() for consistent name schema for adding new items to tables (public interface)
* CHANGE: renamed Drawing.<tablename>.create() to new() for consistent name schema for adding new items to tables,
  this applies to all tables: layers, styles, dimstyles, appids, views, viewports, ucs, block_records. (public interface)
* CHANGE: renamed Layouts.create() to new() for consistent name schema for adding new items to tables (internal interface)
* CHANGE: renamed Drawing.create_layout() to new_layout() for consistent name schema for adding new items (public interface)
* CHANGE: renamed factory method <layout>.add_3Dface() to add_3dface()
* REMOVED: logging and debugging options
* BUGFIX: fixed attribute definition for align_point in DXF entity ATTRIB (AC1015 and newer)
* Cleanup DXF template files AC1015 - AC1027, file size goes down from >60kb to ~20kb

Version 0.7.3 - 2016-03-06
--------------------------

* Quick bugfix release, because ezdxf 0.7.2 can damage DXF R12 files when saving!!!
* NEW: improved DXF R13/R14 compatibility
* BUGFIX: create CLASSES section only for DXF versions newer than R12 (AC1009)
* TEST: converted a bunch of R8 (AC1003) files to R12 (AC1009), AutoCAD didn't complain
* TEST: converted a bunch of R13 (AC1012) files to R2000 (AC1015), AutoCAD did not complain
* TEST: converted a bunch of R14 (AC1014) files to R2000 (AC1015), AutoCAD did not complain

Version 0.7.2 - 2016-03-05
--------------------------

* NEW: reads DXF R13/R14 and saves content as R2000 (AC1015) - experimental feature, because of the lack of test data
* NEW: added support for common DXF attribute line weight
* NEW: POLYLINE, POLYMESH - added properties is_closed, is_m_closed, is_n_closed
* BUGFIX: MeshData.optimize() - corrected wrong vertex optimization
* BUGFIX: can open DXF files without existing layout management table
* BUGFIX: restore module structure ezdxf.const

Version 0.7.1 - 2016-02-21
--------------------------

* Supported/Tested Python versions: CPython 2.7, 3.4, 3.5, pypy 4.0.1 and pypy3 2.4.0
* NEW: read legacy DXF versions older than AC1009 (DXF R12) and saves it as DXF version AC1009.
* NEW: added methods is_frozen(), freeze(), thaw() to class Layer()
* NEW: full support for DXF entity ELLIPSE (added add_ellipse() method)
* NEW: MESH data editor - implemented add_face(vertices), add_edge(vertices), optimize(precision=6) methods
* BUGFIX: creating entities on layouts works
* BUGFIX: entity ATTRIB - fixed halign attribute definition
* CHANGE: POLYLINE (POLYFACE, POLYMESH) - on layer change also change layer of associated VERTEX entities

Version 0.7.0 - 2015-11-26
--------------------------

* Supported Python versions: CPython 2.7, 3.4, pypy 2.6.1 and pypy3 2.4.0
* NEW: support for DXF entity HATCH (solid fill, gradient fill and pattern fill), pattern fill with background color supported
* NEW: support for DXF entity GROUP
* NEW: VIEWPORT entity, but creating new viewports does not work as expected - just for reading purpose.
* NEW: support for new common DXF attributes in AC1018 (AutoCAD 2004): true_color, color_name, transparency
* NEW: support for new common DXF attributes in AC1021 (AutoCAD 2007): shadow_mode
* NEW: extended custom vars interface
* NEW: dxf2html - added support for custom properties in the header section
* NEW: query() supports case insensitive attribute queries by appending an 'i' to the query string, e.g. '\*[layer=="construction"]i'
* NEW: Drawing.cleanup() - call before saving the drawing but only if necessary, the process could take a while.
* BUGFIX: query parser couldn't handle attribute names containing '_'
* CHANGE: renamed dxf2html to pp (pretty printer), usage: py -m ezdxf.pp yourfile.dxf (generates yourfile.html in the same folder)
* CHANGE: cleanup file structure

Version 0.6.5 - 2015-02-27
--------------------------

* BUGFIX: custom properties in header section written after $LASTSAVEDBY tag - the only way AutoCAD accepts custom tags

Version 0.6.4 - 2015-02-27
--------------------------

* NEW: Support for custom properties in the header section - Drawing.header.custom_vars - but so far AutoCAD ignores
  new created custom properties by ezdxf- I don't know why.
* BUGFIX: wrong DXF subclass for Arc.extrusion (error in DXF Standard)
* BUGFIX: added missing support files for dxf2html

Version 0.6.3 - 2014-09-10
--------------------------

* Beta status
* BUGFIX: Text.get_pos() - dxf attribute error "alignpoint"

Version 0.6.2 - 2014-05-09
--------------------------

* Beta status
* NEW: set ``ezdxf.options.compress_default_chunks = True`` to compress unnecessary Sections (like THUMBNAILIMAGE) in
  memory with zlib
* NEW: Drawing.compress_binary_data() - compresses binary data (mostly code 310) in memory with zlib or set
  ``ezdxf.options.compress_binary_data = True`` to compress binary data of every drawing you open.
* NEW: support for MESH entity
* NEW: support for BODY, 3DSOLID and REGION entity, you get the ACIS data
* CHANGE: Spline() - removed context managers fit_points(), control_points(), knot_values() and weights() and added a
  general context_manager edit_data(), similar to Mesh.edit_data() - unified API
* CHANGE: MText.buffer() -> MText.edit_data() - unified API (MText.buffer() still exists as alias)
* CHANGE: refactored internal structure - only two DXF factories remaining:
    - LegacyDXFFactory() for AC1009 (DXF12) drawings
    - ModernDXFFactory() for newer DXF versions except DXF13/14.
* BUGFIX: LWPolyline.get_rstrip_point() removed also x- and y-coords if zero
* BUGFIX: opens DXF12 files without handles again
* BUGFIX: opens DXF12 files with HEADER section but without $ACADVER set

Version 0.6.1 - 2014-05-02
--------------------------

* Beta status
* NEW: create new layouts - Drawing.create_layout(name, dxfattribs=None)
* NEW: delete layouts - Drawing.delete_layout(name)
* NEW: delete blocks - Drawing.blocks.delete_block(name)
* NEW: read DXF files from zip archives (its slow).
* CHANGE: LWPolyline returns always 5-tuples (x, y, start_width, end_width, bulge). start_width, end_width and bulge
  is 0 if not present.
* NEW: LWPolyline.get_rstrip_points() -> generates points without appending zeros.
* NEW: LWPolyline.rstrip_points() -> context manager for points without appending zeros.
* BUGFIX: fixed handle creation bug for DXF12 files without handles, a code 5/105 issue
* BUGFIX: accept floats as int (thanks to ProE)
* BUGFIX: accept entities without owner tag (thanks to ProE)
* improved dxf2html; creates a more readable HTML file; usage: python -m ezdxf.dxf2html filename.dxf

Version 0.6.0 - 2014-04-25
--------------------------

* Beta status
* Supported Python versions: CPython 2.7, 3.4 and pypy 2.2.1
* Refactoring of internal structures
* CHANGE: appended entities like VERTEX for POLYLINE and ATTRIB for INSERT are linked to the main entity and do
  not appear in layouts, model space or blocks (modelspace.query('VERTEX') is always an empty list).
* CHANGE: refactoring of the internal 2D/3D point representation for reduced memory footprint
* faster unittests
* BUGFIX: opens minimalistic DXF12 files
* BUGFIX: support for POLYLINE new (but undocumented) subclass names: AcDbPolyFaceMesh, AcDbPolygonMesh
* BUGFIX: support for VERTEX new (but undocumented) subclass names: AcDbFaceRecord, AcDbPolyFaceMeshVertex,
  AcDbPolygonMeshVertex, AcDb3dPolylineVertex
* CHANGE: Polyline.get_mode() returns new names: AcDb2dPolyline, AcDb3dPolyline, AcDbPolyFaceMesh, AcDbPolygonMesh
* CHANGE: separated layout spaces - each layout has its own entity space

Version 0.5.2 - 2014-04-15
--------------------------

* Beta status
* Supported Python versions: CPython 2.7, 3.3, 3.4 and pypy 2.2.1
* BUGFIX: ATTRIB definition error for AC1015 and later (error in DXF specs)
* BUGFIX: entity.dxf_attrib_exists() returned True for unset attribs with defined DXF default values
* BUGFIX: layout.delete_entity() didn't delete following data entities for INSERT (ATTRIB) & POLYLINE (VERTEX)
* NEW: delete all entities from layout/block/entities section
* cleanup DXF template files

Version 0.5.1 - 2014-04-14
--------------------------

* Beta status
* Supported Python versions: CPython 2.7, 3.3, 3.4 and pypy 2.2.1
* BUGFIX: restore Python 2 compatibility (has no list.clear() method);
  test launcher did not run tests in sub-folders, because of missing
  __init__.py files

Version 0.5.0 - 2014-04-13
--------------------------

* Beta status
* BUGFIX: Drawing.get_layout_setter() - did not work with entities without DXF attribute *paperspace*
* NEW: default values for DXF attributes as defined in the DXF standard, this allows usage of optional DXF attributes
  (with defined default values) without check of presence, like *entity.dxf.paperspace*.
* NEW: DXF entities SHAPE, RAY, XLINE, SPLINE
* NEW: delete entities from layout/block
* CHANGE: entity 3DFACE requires 3D coordinates (created by add_3Dface())
* CHANGE: LWPolyline all methods return points as (x, y, [start_width, [end_width, [bulge]]]) tuples
* updated docs

Version 0.4.2 - 2014-04-02
--------------------------

* Beta status
* Supported Python versions: CPython 2.7, 3.3, 3.4 and pypy 2.1
* NEW: DXF entities LWPOLYLINE, MTEXT
* NEW: convenience methods place(), grid(), get_attrib_text() and has_attrib() for the Insert entity
* CHANGE: pyparsing as external dependency
* BUGFIX: iteration over drawing.entities yields full functional entities (correct layout attribute)
* BUGFIX: install error with pip and missing DXF template files of versions 0.4.0 & 0.4.1

Version 0.3.0 - 2013-07-20
--------------------------

* Alpha status
* Supported Python versions: CPython 2.7, 3.3 and pypy 2.0
* NEW: Entity Query Language
* NEW: Import data from other DXF files
* CHANGE: License changed to MIT License

Version 0.1.0 - 2010-03-14
--------------------------

* Alpha status
* Initial release