DGN

Full Name	MicroStation Drawing
Format ID	IG_FORMAT_DGN = 73
File Extension(s)	*.dgn
Data Type	Vector image
Data Encoding	Binary
Color Profile Support	No
Multi-Page Support	No
Alpha Channel Support	No
ImageGear 3D Image Support	Yes
ImageGear Raster to Vector Format Conversion Support	No
ImageGear Unicode Text Display Support	No

To support the DGN format, attach the ImageGear CAD/Vector DGN Component to Core ImageGear. See Attaching Components.

ImageGear Supported Versions:

Only DGN V7 files are supported. The following supported versions correspond to DGN V7 file format:

DGN_VERSION_DGN1_2D
DGN_VERSION_DGN1_3D
DGN_VERSION_CEL1_2D
DGN_VERSION_CEL1_3D

If you attempt to load DGN files with unsupported formats, such as DGN V8, the IGE_CANT_READ_HEADER error will be thrown.

ImageGear Supported Features:

IG_FLTR_DETECTSUPPORT - autodetection

IG_FLTR_PAGEREADSUPPORT - single page file reading

ImageGear Read Support:

IG_COMPRESSION_NONE - Vector/CAD data

ImageGear Write Support:

ImageGear Filter Control Parameters:

Filter Control Parameter	Type	Default Value	Available Values	Description
BACKCOLOR	AT_INT32	0	Any positive value	This parameter sets view background color for image reading. If 0, black background color is set, otherwise white background color is set.
WIDTH	AT_INT32	512	Any positive value	Defines the width of the empty DIB associated with the image after loading. DIB height is calculated using the file's scale factors. See Working with Vector Images.

Comments:

DGN is a CAD file format used by Intergraph IGDS CAD software. It is not as commonly used as some other CAD file formats, but it has an open specification.

DGN Elements Supported for Reading

DGN Element	Supported Attributes	Imported into ImageGear as:
Shared cell definition	Cell name	IG_VECT_ENT_BLOCK entity.
Shared cell instance	Cell name Transformation matrix	IG_VECT_ENT_BLOCK entity that appends the shared cell definition to its container and is made current.
Shape	Points Color Line type	IG_VECT_ENT_POLYLINE entity.
Cell header	Cell name	IG_VECT_ENT_BLOCK entity.
Line string	Points Color Line type	IG_VECT_ENT_POLYLINE entity.
Curve	Points Color Line type	IG_VECT_ENT_POLYLINE entity.
B-spline surface	Order Rational flag Poles Knots Rule lines Color Line type	IG_VECT_ENT_NURBS_SURFACE entity.
Text	Font Alignment Width Height Rotation Text string Color	IG_VECT_ENT_TEXT entity.
Arc	Start angle End angle X Radius Y Radius Rotation Center Color Line type	IG_VECT_ENT_ARC entity.
Ellipse	X Radius Y Radius Rotation Center Color Line type	IG_VECT_ENT_ELLIPSE entity.
Line	Start point End point Color Line type	IG_VECT_ENT_EASYLINE entity.
Group data: Named View level	Origin Matrix	Several HIG_VECT_VIEW objects.
Group data: Color table level	256 color values	Used as a palette internally.
Level symbology		HIG_VECT_LAYER object.