Chapter 6 -- ENTITIES Section
VIEWPORT

The following group codes apply to viewport entities. In addition to the group codes described here, see "Common Group Codes for Entities." For information about abbreviations and formatting used in this table, see "Formatting Conventions in This Reference."

Viewport group codes
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.

12

View center point (in DCS)
DXF: X value; APP: 2D point

22

DXF: View center point Y value (in DCS)

13

Snap base point
DXF: X value; APP: 2D point

23

DXF: Snap base point Y value

14

Snap spacing
DXF: X value; APP: 2D point

24

DXF: Snap spacing Y value

15

Grid spacing
DXF: X value; APP: 2D point

25

DXF: Grid spacing Y value

16

View direction vector (in WCS)


DXF: X value; APP: 3D vector

26, 36

DXF: Y and Z values of view direction vector (in WCS)

17

View target point (in WCS)


DXF: X value; APP: 3D vector

27, 37

DXF: Y and Z values of view target point (in WCS)

42

Perspective lens length

43

Front clip plane Z value

44

Back clip plane Z value

45

View height (in model space units)

50

Snap angle

51

View twist angle

72

Circle zoom percent

341

Frozen layer object ID/handle (multiple entries may exist) (optional)

90

Viewport status bit coded flags:
1 (0x1) = Enables perspective mode
2 (0x2) = Enables front clipping
4 (0x4) = Enables back clipping
8 (0x8) = Enables UCS follow
16 (0x10) = Enables front clip not at eye
32 (0x20) = Enables UCS icon visibility
64 (0x40) = Enables UCS icon at origin
128 (0x80) = Enables fast zoom
256 (0x100) = Enables snap mode
512 (0x200) = Enables grid mode
1024 (0x400) = Enables isometric snap style
2048 (0x800) = Enables hide plot mode
4096 (0x1000) = kIsoPairTop. If set and kIsoPairRight is not set, then isopair top is enabled. If both kIsoPairTop and kIsoPairRight are set, then isopair left is enabled.
8192 (0x2000) = kIsoPairRight. If set and kIsoPairTop is not set, then isopair right is enabled.
16384 (0x4000) = Enables viewport zoom locking
32768 (0x8000) = Currently always enabled
65536 (0x10000) = Enables non-rectangular clipping
131072 (0x20000) = Turns the viewport off

340

Hard-pointer ID/handle to entity that serves as the viewport's clipping boundary (only present if viewport is non-rectangular)

1

Plot style sheet name assigned to this viewport

281

Render mode:
0 = 2D Optimized (classic 2D)
1 = Wireframe
2 = Hidden line
3 = Flat shaded
4 = Gouraud shaded
5 = Flat shaded with wireframe
6 = Gouraud shaded with wireframe

All rendering modes other than 2D Optimized engage the new 3D graphics pipeline. These values directly correspond to the SHADEMODE command and the AcDbAbstractViewTableRecord::RenderMode enum

71

UCS per viewport flag:
0 = The UCS will not change when this viewport becomes active.
1 = This viewport stores its own UCS which will become the current UCS whenever the viewport is activated.

74

Display UCS icon at UCS origin flag:

Controls whether UCS icon represents viewport UCS or current UCS (these will be different if UCSVP is 1 and viewport is not active).  However, this field is currently being ignored and the icon always represents the viewport UCS.

110

UCS origin
DXF: X value; APP: 3D point

120, 130

DXF: Y and Z values of UCS origin

111

UCS X-axis
DXF: X value; APP: 3D vector

121, 131

DXF: Y and Z values of UCS X-axis

112

UCS Y-axis
DXF: X value; APP: 3D vector

122, 132

DXF: Y and Z values of UCS Y-axis

345

ID/handle of AcDbUCSTableRecord if UCS is a named UCS.  If not present, then UCS is unnamed.

346

ID/handle of AcDbUCSTableRecord of base UCS if UCS is orthographic (79 code is non-zero).  If not present and 79 code is non-zero, then base UCS is taken to be WORLD.

79

Orthographic type of UCS
0 = UCS is not orthographic;
1 = Top; 2 = Bottom;
3 = Front; 4 = Back;
5 = Left; 6 = Right

146

Elevation

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