DXF Library - The Drawing Interchange Format Library in C#

Introduction

This is one of many DXF librarys that is avalible here on Github. It can be used currently to extract and read information from a dxf file. One of the main focuses however besides being able to read (and maybe one day write) a file is to be able to calculate all of the geometry of the entities in the file. Also, this library is designed to be flexible in other words if a property is changed in any entity all the geometry will be updated along will the geometry of all entities that are linking to that Entity.

Goals of this Library

• read (one day write) all of the entities in the Dxf format
• flexible geometry based entities that can be updated real time without writing and re reading the file.
• Speed, this library should be really fast.

Check out my website for the application on github-pages: DXF Site

Also, take a look at the change log Change Log

Supported Versions

Currently this Library supports the following Versions of AutoCAD

• AC1006 (R10)
• AC1009 (R11 & R12)
• AC1012 (R14)
• AC1014 (R14)
• AC1015 (AutoCAD 2000)
• AC1018 (AutoCAD 2004)
• AC1021 (AutoCAD 2007)
• AC1024 (AutoCAD 2010)
• AC1027 (AutoCAD 2013)

Example

// ExampleFile.cs

// open a file
var dxfFile = new DxfFile(StringPathToFile);

// Get whole layers
var layer = dxfFile.Layers.GetLayer("LayerTest");

// Entities all have a common base class "Entity" so they can all be down and up casted
foreach (var entity in layer.GetAllEntities())
{
	// setting all lwpolylines elevations to 0
	if (entity.EntityType == EntityTypes.LwPolyline && ((LwPolyLine)entity).Elevation != 0)
	{
		((LwPolyLine)entity).Elevation = 0;
	}
}

// Geometry was originally calc. duing extraction
var lines = dxfFile.Entities.GetEntitiesByType<Line>(EntityTypes.Line);

// When a GeometryChange event is called Geometry will Automatically update
lines[0].Vertex = new Vertex(0, 1); // GeometryChanged Event will be called at the Vertex Entity

Currently Supported Entities

• LINE
• LWPOLYLINE (Light weight Polyline)
• HATCH
• ARC
• CIRCLE
• POINT
• TEXT
• MTEXT

Future Development

Future development includes adding these other entities (in order of importance):

• POLYLINE