DWG

Full Name	DWG (AutoDesk AutoCAD)
Format ID	IG_FORMAT_DWG = 69
File Extension(s)	*.dwg
Data Type	Vector/CAD 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	Yes

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

ImageGear Supported Versions:

Read: Versions 2.5 through 2007
Write: Versions 12 through 2007

ImageGear Supported Features:

IG_FLTR_DETECTSUPPORT - autodetection
IG_FLTR_PAGEREADSUPPORT - single page file reading
IG_FLTR_PAGEINSERTSUPPORT - single-page file writing

ImageGear Read Support:

IG_COMPRESSION_NONE - Vector/CAD data

ImageGear Write Support:

IG_COMPRESSION_NONE - Vector/CAD data

ImageGear Filter Control Parameters:

Filter Control Parameter	Type	Default Value	Available Values	Description
BACKCOLOR	UINT	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.
FONTPATH	LP \| CHAR	""	Any string up to 262 characters	Defines a path to the vector font files. Format - <Path1>;< Path2>;... .
LINEWIDTHDEF	DOUBLE	0	Any positive value	This parameter has been deprecated and will be removed from the public API in a future release.
PASSWORD	LP \| CHAR	""	Any string up to 262 characters	Sets password for reading encrypted files.
SHOWHIDDEN	AT_BOOL	FALSE	TRUE, FALSE	If TRUE, hidden layers are shown by default.
TRUETYPE	AT_BOOL	FALSE	TRUE, FALSE	This parameter has been deprecated and will be removed from the public API in a future release.
TTFWIDTH	DOUBLE	0	Any positive value	This parameter has been deprecated and will be removed from the public API in a future release.
VERSION	LP \| CHAR	ACAD2004	ACAD12, ACAD13, ACAD14, ACAD2000, ACAD2004, ACAD2007	Used to specify version to save the file as.
WIDTH	INT	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:

DWG, short for "DraWinG", is a CAD file format which serves as the native file format for drawings created in AutoCAD.

DWG/DXF Elements Supported for Reading

CAD Element	Supported Attributes	Imported into ImageGear as:
VIEWPORT	Center point Width Height View target View direction Frozen layers Non-rectangle clipping	IG_VECT_ENT_VIEWPORT entity.
LINE	Start point End point Draw color Line type Line weight	IG_VECT_ENT_EASYLINE entity.
2D Simple polyline	Vertices Draw color Line type Start width	IG_VECT_ENT_POLYLINE entity.
2D Quadratic spline	Vertices Draw color Line type Start width	IG_VECT_ENT_BEZIER_CURVE entity, interpolated as Bezier with degree=2.
2D Cubic spline	Vertices Draw color Line type Start width	IG_VECT_ENT_BEZIER_CURVE entity, interpolated as Bezier with degree=3.
2D Fit polyline	Vertices Draw color Line type Start width	IG_VECT_ENT_BEZIER_CURVE entity, interpolated as cubic B-spline.
3D Simple polyline	Vertices Draw color Line type Line weight	IG_VECT_ENT_POLYLINE entity.
3D Quadratic spline	Vertices Draw color Line type Line weight	IG_VECT_ENT_BEZIER_CURVE entity, interpolated as Bezier with degree=2.
3D Cubic spline	Vertices Draw color Line type Line weight	IG_VECT_ENT_BEZIER_CURVE entity, interpolated as Bezier with degree=3.
Polyface mesh (if contains faces)	Draw color Line type Fill color Fill type	IG_VECT_ENT_SHELL entity. The entity contains the result of breaking the polyface into simple objects such as vertices, edges, faces, etc.
Polyface mesh (if does not contain faces)	Draw color Line type Line weight Hidden vertices	IG_VECT_ENT_POLYLINE entity.
Block reference	Scale Position Orientation Draw color Fill color Line type Fill type	IG_VECT_ENT_INSERTION entity.
Spline	Knots Vertices (weights are supported) Draw color Line type	IG_VECT_ENT_NURBS_CURVE entity.
Ellipse	Orientation Major axe Ratio Start angle End angle Center Draw color Line type Line weight	IG_VECT_ENT_ARC entity.
Solid	Points [0…3] Draw color Line type Fill color Fill type Thickness	IG_VECT_ENT_SOLID entity.
Trace	Points [0…3] Draw color Line type Fill color Fill type Thickness	IG_VECT_ENT_SOLID entity.
3D solid	Draw color Line type Fill color Fill type	IG_VECT_ENT_SHELL entity. The entity contains the result of breaking the polyface into simple objects such as vertices, edges, faces, etc.
Polyline (don’t confuse with 2D polyline and 3D polyline)	Vertices (Bulge attribute is supported) Draw color Line type Constant width	IG_VECT_ENT_POLYLINE entity.
Hatch	Draw color Line type Fill color Fill type Gradient filling Hatch lines	IG_VECT_ENT_FIGURE entity.
Circle	Orientation Center Radius Draw color Line type Line weight	IG_VECT_ENT_ELLIPSE entity.
Region	Draw color Line type Fill color Fill type	IG_VECT_ENT_SHELL entity. The entity contains the result of breaking the polyface into simple objects such as vertices, edges, faces, etc.
MText	Orientation Text color Location Font Font height Font width factor Underlined flag	IG_VECT_ENT_BLOCK entitywith several IG_VECT_ENT_TEXT entities and IG_VECT_ENT_INSERT that references this block.
Text	Orientation Font Italic Weight Font height Font width factor Text color Underlined flag Alignment Position Alignment point	IG_VECT_ENT_TEXT entity.
Attribute	Orientation Font Italic Weight Font height Font width factor Text color Underlined flag Alignment Position Alignment point	IG_VECT_ENT_TEXT entity.
Attribute definition	Orientation Font Italic Weight Font height Font width factor Text color Underlined flag Alignment Position Alignment point	IG_VECT_ENT_TEXT entity.
Raster image	Units File name Image size Image scale Clip boundary	IG_VECT_ENT_RASTER entity.
Face	Vertices Draw color Line type	IG_VECT_ENT_POLYLINE entity.
Arc	Orientation Center Start angle End angle Radius Draw color Line type Thickness	IG_VECT_ENT_ARC entity.
Dimension	Block position Draw color Line type Fill color Fill type	IG_VECT_ENT_INSERTION entity that references the existing block.
Leader	Arrow head Vertices Scale Arrow head size Reference box Fill color Fill type Draw color Line type	IG_VECT_ENT_INSERTION and IG_VECT_ENT_BLOCK with IG_VECT_ENT_POLYLINE and IG_VECT_ENT_SOLID entities inside it.
Tolerance	Location Text Size of the text Draw color Line type Fill color Different shape attributes of included entities	IG_VECT_ENT_INSERTION and IG_VECT_ENT_BLOCK with several entities inside it, such as IG_VECT_ENT_TEXT, IG_VECT_ENT_ELLIPSE, and so on.
Block table record	Draw color Line type Fill color Fill type	IG_VECT_ENT_BLOCK entity.
Viewport table record (don’t confuse with VIEWPORT entity)	View name View content as a block Direction Target point Twist (angle) Clip distance Background color	HIG_VECT_VIEW object.

ImageGear Vector Entities Supported for Writing to DWG and DXF Formats

ImageGear Entity or Object	Saved as DWG/DXF Element
IG_VECT_ENT_BLOCK	Block table record.
IG_VECT_ENT_INSERTION	Block reference.
IG_VECT_ENT_EASYLINE	Line.
IG_VECT_ENT_POLYLINE	Depending on fill type and vertex count: Polyline Face 3D Polyline Hatch Hatch is created if non-zero fill type object is attached to the polyline and its type is one of the following: IG_VECT_FP_SOLID IG_VECT_FP_HATCH_BDIAGONAL IG_VECT_FP_HATCH_CROSS IG_VECT_FP_HATCH_DIAGCROSS IG_VECT_FP_HATCH_FDIAGONAL IG_VECT_FP_HATCH_HORIZONTAL IG_VECT_FP_HATCH_VERTICAL IG_VECT_FP_GRADIENT
IG_VECT_ENT_POLYLINEEX	3D polyline for every contour. If non-zero fill type object is attached to the polyline, then a Hatch is created as well.
IG_VECT_ENT_ELLIPSE	If the entity contains a draw color attribute, then Ellipse object is created. If the entity references a fill type, then Hatch object is created.
IG_VECT_ENT_ARC	If draw color is attached to the entity, then Ellipse object is created. If non-zero fill type object is attached to the entity, then Hatch object is created.
IG_VECT_ENT_TEXT	Several Text objects.
IG_VECT_ENT_BEZIER_CURVE	If curve flag is set to IG_VECT_NURBS_MFIT, then 2D Fit polyline; If Bezier degree is 2, then 3D Quadratic spline; If Bezier degree is 3, then 3D Cubic spline.
IG_VECT_ENT_NURBS_CURVE	Spline.
IG_VECT_ENT_EASY_SURFACE	Polygon mesh.
IG_VECT_ENT_FIGURE	If the entity references a fill type, then hatch object is created. If the entity references a line type, then internal entities are saved as Polyline objects using entity data cache.
IG_VECT_ENT_RASTER	Raster image (saved to a separate raster file and referenced from the DWG/DXF file). Filename must be specified for the raster entity. See IG_vect_raster_set_filename.
IG_VECT_ENT_VIEWPORT	Viewport (don’t confuse with Viewport table record).
IG_VECT_ENT_SHELL	If the entity contains only triangles and quadrilaterals then it is saved as polyface mesh. Otherwise, the entity is saved as line segments or region.
IG_VECT_ENT_SOLID	Solid.
IG_VECT_ENT_GEOMETRY	If Fill type exists, then region; otherwise line segments.
HIG_VECT_VIEW	Viewport table record.