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Note: AutoCAD R14 supports only a single paper space layout and it does not support lineweights, as lineweights were added in are available starting with AutoCAD 2000.
Working with Drawings
How do I determine the drawing units (millimeters, inches, feet, or kilometers) of a drawing?
There are Any drawing stores a number of system variables stored in a drawing that are responsible for units and their display. The It is important to know the DWG version in which the system variables were introduced is important. As some DWG file versions do not store all of the system variables, loading an older file assigns default values to the newer system variables.
MEASUREMENT is a read-only system variable , which that was introduced in DWG R14. This system variable controls hatch pattern and linetype files used in the drawing.
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AUNITS was introduced before DWG R12. It controls how angle values display the units for angle measurements (decimal degrees, degrees/minutes/seconds, or radians). This system variable affects only the display of values. API functions always return angles in radians.
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NOTE: Altering the values of INSUNITS, LUNITS, or AUNITS does not effect any coordinates stored in the drawing. The contents of the drawing are not scaled.
Why
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linetypes do not display when using OdDb3dPolyline?
Linetypes do not display for 3D polylines. In AutoCAD, OdDb3dPolylines (AcDb3dPolylines) always display with a SOLID linetype.
You can use OdDb2dPolyline or OdDbPolyline for planar polylines or OdDbLine for a single line segment.
Note that linetype : Linetype generation for planar polylines can be different. See OdDb2dPolyline::isLinetypeGenerationOn() and OdDbPolyline::hasPlinegen().
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It depends. The rendering works differently in 2D wireframe and 3D render modes, as follows:
3D render modes — The appearance depends on which of the two entities is closer to the camera. If the entities are in the same plane, the result is unpredictable.
2D wireframe render mode — The appearance depends on the drawing order. By default, the entity that appears in the file first is rendered first. But this The order can be changed using OdDbSortentsTable methods. If The value of the SORTENS system variable determines whether OdDbSortentsTable is taken into account or not depends on value of the SORTENTS system variable.
The Sort Table is returned by OdDbBlockTableRecord::getSortentsTable() for Layout blocks.
Note that : OdDbBlockTableRecord::newIterator() can return a "sorted" iterator, which takes into account the Sort Table.