Interface DwgHeader

The AutoCAD drawing database version number:

• AC1006: R10
• AC1009: R11 and R12
• AC1012: R13
• AC1014: R14
• AC1015: AutoCAD 2000
• AC1018: AutoCAD 2004
• AC1021: AutoCAD 2007
• AC1024: AutoCAD 2010
• AC1027: AutoCAD 2013
• AC1032: AutoCAD 2018

The zero (0) base angle with respect to the current UCS. Initial value: 0.0000

The direction of positive angles Initial value: 0

• 0: Counterclockwise angles
• 1: Clockwise angles

Attribute visibility Initial value: 1

• 0: Off: Makes all attributes invisible
• 1: Normal: Retains current visibility of each attribute; visible attributes are displayed; invisible attributes are not
• 2: On: Makes all attributes visible

Units format for angles Initial value: 0

• 0: Decimal degrees
• 1: Degrees/minutes/seconds
• 2: Gradians
• 3: Radians
• 4: Surveyor's units

The display precision for angular units and coordinates. However, the internal precision of angular values and coordinates is always maintained, regardless of the display precision. AUPREC does not affect the display precision of dimension text (see DIMSTYLE). Valid values are integers from 0 to 8. Initial value: 0

Current entity color number 0 = BYBLOCK; 256 = BYLAYER Initial value: 256

The linetype scaling for new objects relative to the LTSCALE command setting. A line created with CELTSCALE = 2 in a drawing with LTSCALE set to 0.5 would appear the same as a line created with CELTSCALE = 1 in a drawing with LTSCALE = 1. Initial value: 1.0000

Entity linetype name, or BYBLOCK or BYLAYER Initial value: BYLAYER

The lineweight of new objects. Initial value: -1

• -1: Sets the lineweight to "BYLAYER."
• -2: Sets the lineweight to "BYBLOCK."
• -3: Sets the lineweight to "DEFAULT." "DEFAULT" is controlled by the LWDEFAULT system variable.

Plotstyle handle of new objects; if CEPSNTYPE is 3, then this value indicates the handle

Plot style type of new objects:

• 0: Plot style by layer
• 1: Plot style by block
• 2: Plot style by dictionary default
• 3: Plot style by object ID/handle

The first chamfer distance Initial value: 0.0000

The second chamfer distance Initial value: 0.0000

Chamfer length

Chamfer angle

Current layer name Initial value: '0'

Current multiline justification Initial value: 0

• 0: Top
• 1: Middle
• 2: Bottom

Current multiline scale. A scale factor of 2.0 produces a multiline twice as wide as the style definition. A zero scale factor collapses the multiline into a single line. A negative scale factor flips the order of the offset lines (that is, the smallest or most negative is placed on top when the multiline is drawn from left to right). Initial value: 1.0000 (imperial) or 20.0000 (metric)

The multiline style that governs the appearance of the multiline. Initial value: 'Standard'

Shadow mode for a 3D object

• 0: Casts and receives shadows
• 1: Casts shadows
• 2: Receives shadows
• 3: Ignores shadows Note: Starting with AutoCAD 2016-based products, this variable is obsolete but still supported for backwards compatibility.

The number of precision places displayed in angular dimensions Initial value: 0

• -1: Angular dimensions display the number of decimal places specified by DIMDEC
• 0-8: Specifies the number of decimal places displayed in angular dimensions (independent of DIMDEC)

The display of alternate units in dimensions. Initial value: 0

• 0: Disables alternate units
• 1: Enables alternate units

The number of decimal places in alternate units. If DIMALT is turned on, DIMALTD sets the number of digits displayed to the right of the decimal point in the alternate measurement. Initial value: 2 (imperial) or 3 (metric)

The multiplier for alternate units. If DIMALT is turned on, DIMALTF multiplies linear dimensions by a factor to produce a value in an alternate system of measurement. The initial value represents the number of millimeters in an inch. Initial value: 25.4000 (imperial) or 0.0394 (metric)

Rounds off the alternate dimension units. Initial value: 0.0000

The number of decimal places for the tolerance values in the alternate units of a dimension. Initial value: 2 (imperial) or 3 (metric)

Controls suppression of zeros for alternate tolerance values. Initial value: 0

• 0: Suppresses zero feet and precisely zero inches
• 1: Includes zero feet and precisely zero inches
• 2: Includes zero feet and suppresses zero inches
• 3: Includes zero inches and suppresses zero feet

To suppress leading or trailing zeros, add the following values to one of the preceding values:

• 4: Suppresses leading zeros
• 8: Suppresses trailing zeros

Units format for alternate units of all dimension style family members except angular: Initial value: 2

• 1: Scientific
• 2: Decimal
• 3: Engineering
• 4: Architectural (stacked)
• 5: Fractional (stacked)
• 6: Architectural
• 7: Fractional
• 8: Operating system defines the decimal separator and number grouping symbols

Controls suppression of zeros for alternate unit dimension values. Initial value: 0

• 0: Suppresses zero feet and precisely zero inches
• 1: Includes zero feet and precisely zero inches
• 2: Includes zero feet and suppresses zero inches
• 3: Includes zero inches and suppresses zero feet
• 4: Suppresses leading zeros in decimal dimensions
• 8: Suppresses trailing zeros in decimal dimensions
• 12: Suppresses both leading and trailing zeros

Specifies a text prefix or suffix (or both) to the alternate dimension measurement for all types of dimensions except angular. For instance, if the current units are Architectural, DIMALT is on, DIMALTF is 25.4 (the number of millimeters per inch), DIMALTD is 2, and DIMAPOST is set to "mm", a distance of 10 units would be displayed as 10"[254.00mm]. To turn off an established prefix or suffix (or both), set it to a single period (.). Initial value: ""

1 = Create associative dimensioning 0 = Draw individual entities Note: Obsolete; see DIMASSOC.

Controls the associativity of dimension objects Initial value: 2

• 0: Creates exploded dimensions; there is no association between elements of the dimension, and the lines, arcs, arrowheads, and text of a dimension are drawn as separate objects
• 1: Creates non-associative dimension objects; the elements of the dimension are formed into a single object, and if the definition point on the object moves, then the dimension value is updated
• 2: Creates associative dimension objects; the elements of the dimension are formed into a single object and one or more definition points of the dimension are coupled with association points on geometric objects

Controls the size of dimension line and leader line arrowheads. Also controls the size of hook lines. Multiples of the arrowhead size determine whether dimension lines and text should fit between the extension lines. DIMASZ is also used to scale arrowhead blocks if set by DIMBLK. DIMASZ has no effect when DIMTSZ is other than zero. Initial value: 0.1800 (imperial) or 2.5000 (metric)

Determines how dimension text and arrows are arranged when space is not sufficient to place both within the extension lines. Initial value: 3

• 0: Places both text and arrows outside extension lines
• 1: Moves arrows first, then text
• 2: Moves text first, then arrows
• 3: Moves either text or arrows, whichever fits best

Angle format for angular dimensions Initial value: 0

• 0: Decimal degrees
• 1: Degrees/minutes/seconds
• 2: Gradians
• 3: Radians
• 4: Surveyor's units

Suppresses zeros for angular dimensions Initial value: 0

• 0: Displays all leading and trailing zeros
• 1: Suppresses leading zeros in decimal dimensions (for example, 0.5000 becomes .5000)
• 2: Suppresses trailing zeros in decimal dimensions (for example, 12.5000 becomes 12.5)
• 3: Suppresses leading and trailing zeros (for example, 0.5000 becomes .5)

Sets the arrowhead block displayed at the ends of dimension lines. To return to the default, closed-filled arrowhead display, enter a single period (.). Arrowhead block entries and the names used to select them in the New, Modify, and Override Dimension Style dialog boxes are shown below. You can also enter the names of user-defined arrowhead blocks. Initial value: ""

• "": closed filled
• "_DOT": dot
• "_DOTSMALL": dot small
• "_DOTBLANK": dot blank
• "_ORIGIN": origin indicator
• "_ORIGIN2": origin indicator 2
• "_OPEN": open
• "_OPEN90": right angle
• "_OPEN30": open 30
• "_CLOSED": closed
• "_SMALL": dot small blank
• "_NONE": none
• "_OBLIQUE": oblique
• "_BOXFILLED": box filled
• "_BOXBLANK": box
• "_CLOSEDBLANK": closed blank
• "_DATUMFILLED": datum triangle filled
• "_DATUMBLANK": datum triangle
• "_INTEGRAL": integral
• "_ARCHTICK": architectural tick

The arrowhead for the first end of the dimension line when DIMSAH is on. Initial value: ""

The arrowhead for the second end of the dimension line when DIMSAH is on. Initial value: ""

Controls drawing of circle or arc center marks and centerlines by the DIMCENTER, DIMDIAMETER, and DIMRADIUS commands. Initial value: 0.0900 (imperial) or 2.5000 (metric)

• 0: No center marks or lines are drawn
• <0: Centerlines are drawn

• 0: Center marks are drawn

Dimension line color: range is 0 = BYBLOCK; 256 = BYLAYER Initial value: 0

Dimension extension line color

• 0 = BYBLOCK
• 256 = BYLAYER

Dimension text color

• 0 = BYBLOCK
• 256 = BYLAYER

Number of decimal places for the tolerance values of a primary units dimension

Dimension line extension

Dimension line increment

Single-character decimal separator used when creating dimensions whose unit format is decimal

Extension line extension

Extension line offset

Scale factor used to calculate the height of text for dimension fractions and tolerances

Dimension line gap

Horizontal dimension text position

• 0 = Above dimension line and center-justified between extension lines
• 1 = Above dimension line and next to first extension line
• 2 = Above dimension line and next to second extension line
• 3 = Above and center-justified to first extension line
• 4 = Above and center-justified to second extension line

Arrow block name for leaders

Linear measurements scale factor

Dimension limits generated if nonzero

Sets units for all dimension types except Angular

• 1 = Scientific
• 2 = Decimal
• 3 = Engineering
• 4 = Architectural
• 5 = Fractional
• 6 = Operating system

Dimension line lineweight

• -3 = Standard
• -2 = ByLayer
• -1 = ByBlock
• 0-211 = 100th of mm

Extension line lineweight

• -3 = Standard
• -2 = ByLayer
• -1 = ByBlock
• 0-211 = 100th of mm

General dimensioning suffix

Rounding value for dimension distances

Use separate arrow blocks if nonzero

Overall dimensioning scale factor

Suppression of first extension line

• 0 = Not suppressed
• 1 = Suppressed

Suppression of second extension line

• 0 = Not suppressed
• 1 = Suppressed

First extension line suppressed if nonzero

Second extension line suppressed if nonzero

Recompute dimensions while dragging

• 0 = Drag original image
• 1 = Recompute

Suppress outside-extensions dimension lines if nonzero

Dimension style name

Text above dimension line if nonzero

Number of decimal places to display the tolerance values

Dimension tolerance display scale factor

Text inside horizontal if nonzero

Force text inside extensions if nonzero

Minus tolerance

Dimension text movement rules

• 0 = Moves the dimension line with dimension text
• 1 = Adds a leader when dimension text is moved
• 2 = Allows text to be moved freely without a leader

If text is outside the extension lines, dimension lines are forced between the extension lines if nonzero

Text outside horizontal if nonzero

Dimension tolerances generated if nonzero

Vertical justification for tolerance values

• 0 = Top
• 1 = Middle
• 2 = Bottom

Plus tolerance

Dimensioning tick size

• 0 = Draws arrowheads

• 0 = Draws oblique strokes

Text vertical position

Dimension text style

Dimensioning text height

Controls suppression of zeros for tolerance values

• 0 = Suppresses zero feet and precisely zero inches
• 1 = Includes zero feet and precisely zero inches
• 2 = Includes zero feet and suppresses zero inches
• 3 = Includes zero inches and suppresses zero feet
• 4 = Suppresses leading zeros in decimal dimensions
• 8 = Suppresses trailing zeros in decimal dimensions
• 12 = Suppresses both leading and trailing zeros

Cursor functionality for user-positioned text

• 0 = Controls only the dimension line location
• 1 = Controls the text position as well

Controls suppression of zeros for primary unit values

• 0 = Suppresses zero feet and precisely zero inches
• 1 = Includes zero feet and precisely zero inches
• 2 = Includes zero feet and suppresses zero inches
• 3 = Includes zero inches and suppresses zero feet
• 4 = Suppresses leading zeros in decimal dimensions
• 8 = Suppresses trailing zeros in decimal dimensions
• 12 = Suppresses both leading and trailing zeros

Controls the display of silhouette curves of body objects in Wireframe mode

• 0 = Off
• 1 = On

Hard-pointer ID to visual style while creating 3D solid primitives. The default value is NULL

Drawing code page; set to the system code page when a new drawing is created

Current elevation set by ELEV command

Lineweight endcaps setting for new objects

• 0 = None
• 1 = Round
• 2 = Angle
• 3 = Square

X, Y, and Z drawing extents upper-right corner (in WCS)

X, Y, and Z drawing extents lower-left corner (in WCS)

Controls symbol table naming

• 0 = AutoCAD Release 14 compatibility
• 1 = AutoCAD 2000

Fillet radius

Fill mode on if nonzero

Set at creation time, uniquely identifies a particular drawing

Specifies a gap to be displayed where an object is hidden by another object

Next available handle

Specifies HIDETEXT system variable

• 0 = HIDE ignores text objects
• 1 = HIDE does not ignore text objects

Path for all relative hyperlinks in the drawing

Controls whether layer and spatial indexes are created and saved in drawing files

• 0 = No indexes are created
• 1 = Layer index is created
• 2 = Spatial index is created
• 3 = Layer and spatial indexes are created

Insertion base set by BASE command (in WCS)

Default drawing units for AutoCAD DesignCenter blocks

• 0: Unitless
• 1: Inches
• 2: Feet
• 3: Miles
• 4: Millimeters
• 5: Centimeters
• 6: Meters
• 7: Kilometers
• 8: Microinches
• 9: Mils
• 10: Yards
• 11: Angstroms
• 12: Nanometers
• 13: Microns
• 14: Decimeters
• 15: Decameters
• 16: Hectometers
• 17: Gigameters
• 18: Astronomical units
• 19: Light years
• 20: Parsecs
• 21: US Survey Feet
• 22: US Survey Inch
• 23: US Survey Yard
• 24: US Survey Mile

Represents the ACI color index of the "interference objects" created during the INTERFERE command Default value is 1

Hard-pointer ID to the visual style for interference objects Default visual style is Conceptual

Hard-pointer ID to the visual style for the viewport during interference checking Default visual style is 3d Wireframe

Specifies the entity color of intersection polylines Values 1-255 designate an AutoCAD color index (ACI) 0 = Color BYBLOCK 256 = Color BYLAYER 257 = Color BYENTITY

Specifies the display of intersection polylines

• 0: Turns off the display of intersection polylines
• 1: Turns on the display of intersection polylines

Lineweight joint setting for new objects

• 0: None
• 1: Round
• 2: Angle
• 3: Flat

Nonzero if limits checking is on

XY drawing limits upper-right corner (in WCS)

XY drawing limits lower-left corner (in WCS)

Global linetype scale

Units format for coordinates and distances

Units precision for coordinates and distances

Controls the display of lineweights on the Model or Layout tab

• 0: Lineweight is not displayed
• 1: Lineweight is displayed

Sets maximum number of viewports to be regenerated

Sets drawing units

• 0: English
• 1: Metric

Name of menu file

Mirror text if nonzero

Specifies the color of obscured lines

• 0 and 256: Entity color
• 1-255: An AutoCAD color index (ACI)

Specifies the linetype of obscured lines

• 0: Off
• 1: Solid
• 2: Dashed
• 3: Dotted
• 4: Short Dash
• 5: Medium Dash
• 6: Long Dash
• 7: Double Short Dash
• 8: Double Medium Dash
• 9: Double Long Dash
• 10: Medium Long Dash
• 11: Sparse Dot

Ortho mode on if nonzero

Point display mode

Point display size

Current paper space elevation

Maximum X, Y, and Z extents for paper space

Minimum X, Y, and Z extents for paper space

Paper space insertion base point

Limits checking in paper space when nonzero

Maximum X and Y limits in paper space

Minimum X and Y limits in paper space

Governs the generation of linetype patterns around the vertices of a 2D polyline

• 1: Linetype is generated in a continuous pattern around vertices of the polyline
• 0: Each segment of the polyline starts and ends with a dash

Default polyline width

Assigns a project name to the current drawing

Controls the saving of proxy object images

Controls paper space linetype scaling

• 1: No special linetype scaling
• 0: Viewport scaling governs linetype scaling

Indicates whether the current drawing is in a Color-Dependent or Named Plot Style mode

• 0: Uses named plot style tables in the current drawing
• 1: Uses color-dependent plot style tables in the current drawing

View scale factor for new viewports

• 0: Scaled to fit

• 0: Scale factor (a positive real value)

Name of the UCS that defines the origin and orientation of orthographic UCS settings (paper space only)

Current paper space UCS name

Current paper space UCS origin

Point which becomes the new UCS origin after changing paper space UCS to BACK when PUCSBASE is set to WORLD

Point which becomes the new UCS origin after changing paper space UCS to BOTTOM when PUCSBASE is set to WORLD

Point which becomes the new UCS origin after changing paper space UCS to FRONT when PUCSBASE is set to WORLD

Point which becomes the new UCS origin after changing paper space UCS to LEFT when PUCSBASE is set to WORLD

Point which becomes the new UCS origin after changing paper space UCS to RIGHT when PUCSBASE is set to WORLD

Point which becomes the new UCS origin after changing paper space UCS to TOP when PUCSBASE is set to WORLD

If paper space UCS is orthographic (PUCSORTHOVIEW not equal to 0), this is the name of the UCS that the orthographic UCS is relative to

Orthographic view type of paper space UCS

• 0: UCS is not orthographic
• 1: Top
• 2: Bottom
• 3: Front
• 4: Back
• 5: Left
• 6: Right

Current paper space UCS X axis

Current paper space UCS Y axis

Quick Text mode on if nonzero

REGENAUTO mode on if nonzero

Controls the shading of edges

• 0: Faces shaded, edges not highlighted
• 1: Faces shaded, edges highlighted in black
• 2: Faces not filled, edges in entity color
• 3: Faces in entity color, edges in black

Percent ambient/diffuse light; range 1-100; default 70

Location of the ground shadow plane. This is a Z axis ordinate.

Sketch record increment

Determines the object type created by the SKETCH command

• 0: Generates lines
• 1: Generates polylines
• 2: Generates splines

Controls the object sorting methods; accessible from the Options dialog box User Preferences tab. SORTENTS uses the following bitcodes

• 0: Disables SORTENTS
• 1: Sorts for object selection
• 2: Sorts for object snap
• 4: Sorts for redraws; obsolete
• 8: Sorts for MSLIDE command slide creation; obsolete
• 16: Sorts for REGEN commands
• 32: Sorts for plotting
• 64: Sorts for PostScript output; obsolete

Number of line segments per spline patch

Spline curve type for PEDIT Spline

Number of mesh tabulations in first direction

Number of mesh tabulations in second direction

Surface type for PEDIT Smooth

Surface density (for PEDIT Smooth) in M direction

Surface density (for PEDIT Smooth) in N direction

Local date/time of drawing creation

Cumulative editing time for this drawing

Universal date/time the drawing was created

Local date/time of last drawing update

User-elapsed timer

Universal date/time of the last update/save

Default text height

Current text style name

Current thickness set by ELEV command

1 for previous release compatibility mode; 0 otherwise

Default trace width

Specifies the maximum depth of the spatial index

Name of the UCS that defines the origin and orientation of orthographic UCS settings

Name of current UCS

Origin of current UCS (in WCS)

Point which becomes the new UCS origin after changing model space UCS to BACK when UCSBASE is set to WORLD

Point which becomes the new UCS origin after changing model space UCS to BOTTOM when UCSBASE is set to WORLD

Point which becomes the new UCS origin after changing model space UCS to FRONT when UCSBASE is set to WORLD

Point which becomes the new UCS origin after changing model space UCS to LEFT when UCSBASE is set to WORLD

Point which becomes the new UCS origin after changing model space UCS to RIGHT when UCSBASE is set to WORLD

Point which becomes the new UCS origin after changing model space UCS to TOP when UCSBASE is set to WORLD

If model space UCS is orthographic (UCSORTHOVIEW not equal to 0), this is the name of the UCS that the orthographic UCS is relative to. If blank, UCS is relative to WORLD

Orthographic view type of model space UCS

• 0: UCS is not orthographic
• 1: Top
• 2: Bottom
• 3: Front
• 4: Back
• 5: Left
• 6: Right

Direction of the current UCS X axis (in WCS)

Direction of the current UCS Y axis (in WCS)

Low bit set = Display fractions, feet-and-inches, and surveyor's angles in input format

Five integer variables intended for use by third-party developers

Five real variables intended for use by third-party developers

Controls the user timer for the drawing

• 0: Timer off
• 1: Timer on

Uniquely identifies a particular version of a drawing. Updated when the drawing is modified

Controls the properties of xref-dependent layers

• 0: Don't retain xref-dependent visibility settings
• 1: Retain xref-dependent visibility settings

Determines whether input for the DVIEW and VPOINT command evaluated as relative to the WCS or current UCS

• 0: Don't change UCS
• 1: Set UCS to WCS during DVIEW/VPOINT

Controls the visibility of xref clipping boundaries

• 0: Clipping boundary is not visible
• 1: Clipping boundary is visible

Controls whether the current drawing can be edited in-place when being referenced by another drawing

• 0: Can't use in-place reference editing
• 1: Can use in-place reference editing