VIEWPORT [ACG]

DXF Group Codes

ENTITIES Section

VIEWPORT

The following group codes apply to viewport entities.

Viewport group code

Group codes	Description
100	Subclass marker (AcDbViewport)
10	Center point (in WCS). DXF: X value; APP: 3D point
20, 30	DXF: Y and Z values of center point (in WCS)
40	Width in paper space units
41	Height in paper space units.
68	Viewport status field: -1 = On, but is fully off screen, or is one of the viewports that is not active because the $MAXACTVP count is currently being exceeded. 0 = Off <positive value > = On and active. The value indicates the order of stacking for the viewports, where 1 is the active viewport, 2 is the next, and so forth.
69	Viewport ID. Changes each time a drawing is opened. Never saved, except for the paper space viewport, which is always 1.

The following table lists the xdata that can be attached to viewport entities. In contrast to normal entity data, the order of the extended group codes is important. Also group codes can appear multiple times.

Viewport xdata group codes

Group codes	Description
1001	Application ID ("ACAD"). This begins a section of xdata that describes the viewport.
1000	Begin viewport data. This field is always the string MVIEW. Other data groups may appear in the future.
1002	Begin window descriptor data. This field always is the string.
1070	Extended data version number. Always the integer 16.
1010	View target point (in WCS). DXF: X value; APP: 3D point
1020,1030	DXF: Y and Z values of view target point (in WCS)
1010	View direction vector (in WCS). DXF: X value; APP: 3D vector.
1020,1030	DXF: Y and Z values of view direction vector (in WCS)
1040	View twist angle
1040	View height
1040	View center point X value (in DCS)
1040	View center point Y value (in DCS)
1040	Perspective lens length
1040	Front clip plane Z value
1040	Back clip plane Z value
1070	View mode
1070	Circle zoom
1070	Fast zoom setting
1070	UCSICON setting
1070	Snap ON/OFF
1070	Grid ON/OFF
1070	Snap style
1070	Snap ISOPAIR
1040	Snap angle
1040	Snap base point UCS X value of coordinate
1040	Snap base point UCS Y value of coordinate
1040	Snap X spacing
1040	Snap Y spacing
1040	Grid X spacing
1040	Grid Y spacing
1070	Hidden in plot flag
1002	Begin frozen layer list (possibly empty). This field always is the string "{".
1003	The names of layers frozen in this viewport. This list may include xref-dependent layers. Any number of 1003 groups may appear here.
1002	End frozen layer list. This field always is the string "}".
1002	End viewport data. This field always is the string "}".

Note The ZOOM XP factor is calculated with the following formula: group_41 / 2nd_group_1040 (or pspace_height / mspace_height).