[dxf export] add support for basic SVG shapes like <rect>

[su_v]

Follow-up report to Bug #656899 “DXF import/export empty”
<https://bugs.launchpad.net/inkscape/+bug/656899>

It seems that DXF export fails to support the rectangle shapes because Inkscape doesn't add the (redundant) 'd' path attribute like it does for the other parametrized shapes - the 'd' attribute is not needed because Inkscape uses the basic SVG shape for rectangles [1]. DXF export should not require rectangles to be converted to paths before export and instead directly parse the <rect> object.

Inkscape rectangle:

    <rect
       style="fill:#ff8080;fill-opacity:0.85098039;stroke:#000000;stroke-width:2;stroke-opacity:1"
       id="rect15890"
       width="130"
       height="90"
       x="20"
       y="20" />

Example from the SVG spec:

  <rect x="400" y="100" width="400" height="200"
        fill="yellow" stroke="navy" stroke-width="10" />

[1] <http://www.w3.org/TR/SVG11/shapes.html#RectElement>

[Alvin Penner (apenner)]

attached is a modified version of the file dxf_outlines.py, which will support the <rect> element.

[su_v (suv-lp)]

Tested and confirmed with Inkscape 0.48+devel r9966 + the attached 'dxf_outlines.py' and QCad v2.0.5.0 (Community Edition), as well as reimported the DXF files into Inkscape.

Transformed (rotated, skewed) rectangles seem exported correctly.

Thx, Alvin :)

[Alvin Penner (apenner)]

thanks for testing, ~suv, committed to rev 9968

[jazzynico (jazzynico)]

Backported to the branch, revision 9812.