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<html><head><title>AutoCAD DXF/DWG</title></head><body bgcolor="#ffffff"><h1>AutoCAD DXF/DWG</h1>Writing simple AutoCAD DXF and DWG files is supported. Reading of DXF andDWG files is currently not supported. The ability to write DXF and DWGis only available when OGR is linked against the DWGdirect library providedby the <a href="http://www.opendesign.com/">Open Design Alliance</a>. Notethat the DWGdirect library is not open source, though the license terms arenot terribly draconian. Check the Open Design Alliance web site for details.<p>There are two distinct drivers, DXF for writing AutoCAD ASCII DXF files, and DWG for writing AutoCAD binary DWG files. However, the data modeland behavior of both drivers is essentially identical.<p>The DXF/DWG drivers currently operate in a highly simplified manner whenwriting. They discard all coordinate system information. Attributes arewritten as extended entity data (DXF type 1000) in the ACAD application.Features are written out as one DXF/DWG entity per simple geometry object.For complex geometry objects such as mutli-ring polygons, multipolygons,and other geometry collections, a distinct entity is written out for eachsimple geometry subcomponent. Amoung other things, this means that theassociation between the outer and inner rings of a polygon is lost, as well as the association of different geometries in a geometry collection.<p>All entities are written out in "model space". A layer is established foreach OGR layer written, and the entities attached to the appropriate layer.<p><h2>Database Creation Options</h2><ul><li> <b>VERSION</b>=[12/13/14/15/18]: Set the format version to generate. <p></ul><h2>Layer Creation Options</h2><ul><li> <b>COLOR=r,g,b</b>: Set the color of a layer.<p></ul><h3>See Also</h3><ul><li> <a href="http://www.opendesign.com/">Open Design Alliance</a> (home of DWGdirect library).<p></ul><hr><b><a href="http://www.osgis.nl/">OSGIS</a></b> and the <b>Geo-Information and ICT Department of the Ministry of Transport, Public Works and Water Management</b> funded development of this driver.<p></body></html>?? 快捷鍵說明
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