[gdal-dev] dxf linewidth

[Jürgen E. Fischer]

Hi Marco,

On Tue, 29. Jan 2013 at 10:48:11 +0100, Marco Hugentobler wrote:
> I have a question regarding writing the linewith from ogr feature style  
> in the dxf driver.
> In ogrdxfwriterlayer.cpp, linewith is written using code 370. This seems  
> to work if I open the dxf file with inkscape. However, if I open it with  
> TrueView (AutoCAD engine), code 370 has no effect on line width.  
> Furthermore, the application refuses to open a file if the 370 value is  
> not one contained in  
> (http://docs.autodesk.com/ACDMAC/2012/ENU/ObjectARX%20Reference/index.html?frmname=topic&frmfile=AcDbLayerTableRecord__lineWeight@const.html). 
>
> Looking at a file generated with AutoCAD engine, I see that it uses code  
> 43. Now I'm not a dxf expert at all, so I don't know if it has to do  
> with different dxf versions or if we should simply change the 370 for 43  
> in the dxf writer? Shall I provide a patch?

43 is also what the DXF reference[1] suggests for the constant width of
LWPOLYLINEs.   It also suggests that the value of 43 is a double, so the
rounding shouldn't be necessary.


Jürgen

[1] http://images.autodesk.com/adsk/files/autocad_2012_pdf_dxf-reference_enu.pdf

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