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# 48. `dxf` — Read/write geometry in DXF format.

This module allows to import and export some simple geometrical items in DXF format.

`Classes defined in module dxf`

class `dxf.``DxfExporter`(filename, terminator='n')

  Export geometry in DXF format.

  While we certainly do not want to promote proprietary software, some of our users occasionally needed to export some model in DXF format. This class provides a minimum of functionality.

  `write`(s)

    Write a string to the dxf file.

    The string does not include the line terminator.

  `out`(code, data)

    Output a string data item to the dxf file.

    code is the group code, data holds the data

  `close`()

    Finalize and close the DXF file

  `section`(name)

    Start a new section

  `endSection`()

    End the current section

  `entities`()

    Start the ENTITIES section

  `layer`(layer)

    Export the layer

  `line`(x, layer=0)

    Export a line.

    x is a (2,3) shaped array

`Functions defined in module dxf`

`dxf.``importDXF`(filename)

  Import (parts of) a DXF file into pyFormex.

  This function scans a DXF file for recognized entities and imports those entities as pyFormex objects. It is only a very partial importer, but has proven to be already very valuable for many users.

  filename: name of a DXF file. The return value is a list of pyFormex objects.

  Importing a DXF file is done in two steps:

  - First the DXF file is scanned and the recognized entities are formatted into a text with standard function calling syntax. See `readDXF()`.
  - Then the created text is executed as a Python script, producing equivalent pyFormex objects. See `convertDXF()`.

`dxf.``readDXF`(filename)

  Read a DXF file and extract the recognized entities.

  filename: name of a .DXF file.

  Returns a multiline string with one line for each recognized entity, in a format that can directly be used by `convertDXF()`.

  This function requires the external program dxfparser which comes with the pyFormex distribution. It currently recognizes entities of type ‘Arc’, ‘Line’, ‘Polyline’, ‘Vertex’.

`dxf.``convertDXF`(text)

  Convert a textual representation of a DXF format to pyFormex objects.

  text : a multiline text representation of the contents of a DXF file.

    This text representation can e.g. be obtained by the function `readDXF()`. It contains lines defining DXF entities. A small example:

        Arc(0.0,0.0,0.0,1.0,-90.,90.)
        Arc(0.0,0.0,0.0,3.0,-90.,90.)
        Line(0.0,-1.0,0.0,0.0,1.0,0.0)
        Polyline(0)
        Vertex(0.0,3.0,0.0)
        Vertex(-2.0,3.0,0.0)
        Vertex(-2.0,-7.0,0.0)
        Vertex(0.0,-7.0,0.0)
        Vertex(0.0,-3.0,0.0)

    Each line of the text defines a single entity or starts a multiple component entity. The text should be well aligned to constitute a proper Python script. Currently, the only defined entities are ‘Arc’, ‘Line’, ‘Polyline’, ‘Vertex’.

  Returns a list of pyFormex objects corresponding to the text. The returned objects are of the following type:

  > function name | object
  > --- | ---
  > Arc | `plugins.curve.Arc`
  > Line | `plugins.curve.Line`
  > Polyline | `plugins.curve.PolyLine`

  No object is returned for the Vertex function: they define the vertices of a PolyLine.

`dxf.``exportDXF`(filename, F)

  Export a Formex to a DXF file

  Currently, only plex-2 Formices can be exported to DXF.

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