CADReader

This library can be used for reading CAD files (version 4). Currently it reads only HEADER and GRAPHICS sections. The SEMANTIC sections is left unprocessed. Only CAD files v4 are supported!

Install

Install with Nuget: Install-Package CADReader.

Usage

Аdd a reference to CADReader and then instantiate a new instance of CADFile class:

using CAD;
using CAD.Entity;
using CAD.Geometry;
using CAD.Nomenclature;
...
// read a CAD file
CADFile file = new CADFile("path/to/cad/file");
file.ReadFile(Encoding...);

// check log message
file.Log;

// get CAD file metadata
CADFileInfo info = file.FileInfo;

// access all layers
List<CADLayer> layers = file.Layers;
// or specific layer
CADLayer cadaster = file[CADLayerType.CADASTER];

// access entities
CADPoint point = cadaster.Entities[0] as CADPoint;

// access entity's geometry
Point geometry = point.Geometry as Point;

Entities

Following entities are described in CAD format and are supported by this library:

• CADLayer - defines a nested section in the GRAPHICS section, grouping 1 or more graphics
• CADPoint - defines point graphics - either points from a geodetical network or polylines.
• CADLine - defines line geometries
• CADContour - defines polygon geometries
• CADSymbol - defines point symbols
• CADText - defines texts

CADLayer

Each CADLayer contains graphics and provides methods for searching using the spatial index, in which all graphics are inserted. Each layer has its separate spatial index created.

Search by Properties

You can provide a filter function and search for graphics, satisfying your filter:

// search by entity type
List<ICADEntity> pointEntities = layer
    .Search(i => i is CADPoint);

// search by CAD ID
string cadID = "6849.210";
ICADEntity result = layer.Search(i =>
{
    if (i is CADContour contour && contour.CADId.Equals(cadID))
        return true;
    return false;
}).FirstOrDefault();

Search in Extent

You can search for all graphics within the specified extent:

// create the search extent
Extent envelope = new Extent(631.362, 1553.444, 638.741, 1561.818);
// search for graphics
List<ICADEntity> results = layer.Search(envelope);

Geometries

• Extent - used as search geometry when running spatial queries within layers
• Point - geometry representation of point graphics like CADPoint
• Polyline - geometry representation of line graphics like CADLine
• Polygon - geometry representation of polygon graphics like CADContour

Nomenclatures

Contains additional classes and enumerations with code/value pairs.