Class AcDbMLine

Represents the AutoCAD MLINE entity.

Hierarchy (View Summary)

Constructors

constructor

Properties

typeName

Accessors

attrs closed color database dxfTypeName extensionDictionary flags geometricExtents isTemp justification layer lineStyle lineType linetypeScale lineWeight normal objectId ownerId properties resolvedColor rgbColor scale segments startPosition styleCount styleName styleObjectHandle suppressEndCaps suppressStartCaps transparency type vertexCount visibility

Methods

appendSegment clearSegments clone close createExtensionDictionary dxfOut dxfOutFields erase getAttr getAttrWithoutException getEntityColor getGeneralProperties getLayerColor getXData hasExplicitColor hasExplicitLayer hasExplicitTransparency removeXData resolveEffectiveProperties setAttr setEntityColor setXData shouldResolveColorFromCecolor subGetGripPoints subGetOsnapPoints subWorldDraw transformBy triggerModifiedEvent worldDraw

Constructors

constructor

Properties

StatictypeName

typeName: string = 'MLine'

Runtime type name used by the entity factory and RTTI helpers.

Accessors

attrs

closed

color

database

  • get database(): AcDbDatabase

  • Gets the database in which this object is resident.

    When an object isn't added to a database, this property returns the current working database. After it is added to a database, it will be set automatically. You should never set this value manually.

    Returns AcDbDatabase

    The database this object belongs to

    Example

    const db = obj.database;
  • set database(db: AcDbDatabase): void

  • Sets the database for this object.

    This is typically set automatically when the object is added to a database. Manual setting should be avoided unless you know what you're doing.

    Parameters

    Returns void

    Example

    obj.database = myDatabase;

dxfTypeName

extensionDictionary

  • get extensionDictionary(): undefined | string

  • Gets the objectId of the extension dictionary owned by this object.

    If the object does not have an extension dictionary, this returns undefined.

    In ObjectARX terms, this is equivalent to AcDbObject::extensionDictionary().

    Returns undefined | string

    The extension dictionary objectId, or undefined

    Example

    const dictId = obj.extensionDictionary
    if (dictId) {
      console.log('Has extension dictionary:', dictId)
    }
  • set extensionDictionary(value: undefined | string): void

  • Sets the objectId of the extension dictionary owned by this object.

    This does not create or delete the dictionary object itself — it only establishes or clears the ownership relationship.

    Passing undefined removes the association.

    Parameters

    • value: undefined | string

      The extension dictionary objectId, or undefined

    Returns void

    Example

    obj.extensionDictionary = dict.objectId

flags

geometricExtents

isTemp

  • get isTemp(): any

  • Returns true if this object is temporary and not yet committed to the database.

    A temporary object is identified by its objectId starting with the TEMP prefix.

    Returns any

justification

layer

  • get layer(): string

  • Gets the name of the layer referenced by this entity.

    Returns string

    The layer name

    Example

    const layerName = entity.layer;
  • set layer(value: string): void

  • Sets the name of the layer for this entity.

    Parameters

    • value: string

      The new layer name

    Returns void

    Example

    entity.layer = 'MyLayer';

lineStyle

  • get lineStyle(): AcGiLineStyle

  • Gets the line style for this entity.

    This method returns the line style based on the entity's linetype and other properties.

    Returns AcGiLineStyle

    The line style object

    Example

    const lineStyle = entity.lineStyle;

lineType

  • get lineType(): string

  • Gets the name of the line type referenced by this entity.

    Returns string

    The linetype name

    Example

    const lineType = entity.lineType;
  • set lineType(value: string): void

  • Sets the name of the line type for this entity.

    Parameters

    • value: string

      The new linetype name

    Returns void

    Example

    entity.lineType = 'DASHED';

linetypeScale

  • get linetypeScale(): number

  • Gets the line type scale factor of this entity.

    When an entity is first instantiated, its line type scale is initialized to an invalid value. When the entity is added to the database, if a linetype scale has not been specified for the entity, it is set to the database's current line type scale value.

    Returns number

    The linetype scale factor

    Example

    const scale = entity.linetypeScale;
  • set linetypeScale(value: number): void

  • Sets the line type scale factor for this entity.

    Parameters

    • value: number

      The new linetype scale factor

    Returns void

    Example

    entity.linetypeScale = 2.0;

lineWeight

normal

objectId

  • get objectId(): string

  • Gets the object ID.

    AutoCAD uses 64-bit integers to represent handles, which exceed the maximum integer value of JavaScript. Therefore, strings are used to represent object handles.

    Returns string

    The object ID as a string

    Example

    const id = obj.objectId;
    console.log(`Object ID: ${id}`);
  • set objectId(value: string): void

  • Sets the object ID.

    Parameters

    • value: string

      The new object ID

    Returns void

    Example

    obj.objectId = 'new-object-id';

ownerId

  • get ownerId(): string

  • Gets the object ID of the owner of this object.

    Returns string

    The owner object ID

    Example

    const ownerId = obj.ownerId;
  • set ownerId(value: string): void

  • Sets the object ID of the owner of this object.

    Parameters

    • value: string

      The new owner object ID

    Returns void

    Example

    obj.ownerId = 'parent-object-id';

properties

resolvedColor

rgbColor

  • get rgbColor(): number

  • Gets the RGB color of this entity.

    This method handles the conversion of color indices (including ByLayer and ByBlock) to actual RGB colors. It resolves layer colors and block colors as needed.

    Returns number

    The RGB color value as a number

    Example

    const rgbColor = entity.rgbColor;
    console.log(`RGB: ${rgbColor.toString(16)}`);

scale

segments

startPosition

styleCount

  • get styleCount(): number

  • Gets the number of style elements expected by the entity.

    Returns number

    Style element count.

  • set styleCount(value: number): void

  • Sets the style element count. Negative values are clamped to 0.

    Parameters

    • value: number

      Requested style element count.

    Returns void

styleName

styleObjectHandle

suppressEndCaps

  • get suppressEndCaps(): boolean

  • Indicates whether end caps are suppressed during rendering.

    Returns boolean

    true when the SuppressEndCaps flag is set.

  • set suppressEndCaps(value: boolean): void

  • Enables or disables end cap suppression.

    Parameters

    • value: boolean

      true to suppress end caps.

    Returns void

suppressStartCaps

  • get suppressStartCaps(): boolean

  • Indicates whether start caps are suppressed during rendering.

    Returns boolean

    true when the SuppressStartCaps flag is set.

  • set suppressStartCaps(value: boolean): void

  • Enables or disables start cap suppression.

    Parameters

    • value: boolean

      true to suppress start caps.

    Returns void

transparency

type

  • get type(): string

  • Gets the type name of this entity.

    This method returns the entity type by removing the "AcDb" prefix from the constructor name.

    Returns string

    The entity type name

    Example

    const entity = new AcDbLine();
    console.log(entity.type); // "Line"

vertexCount

visibility

  • get visibility(): boolean

  • Gets whether this entity is visible.

    Returns boolean

    True if the entity is visible, false otherwise

    Example

    const isVisible = entity.visibility;
  • set visibility(value: boolean): void

  • Sets whether this entity is visible.

    Parameters

    • value: boolean

      True to make the entity visible, false to hide it

    Returns void

    Example

    entity.visibility = false; // Hide the entity

Methods

appendSegment

clearSegments

clone

  • clone(): this

  • Creates a deep clone of this object.

    The cloned object is a detached in-memory object:

    • It has a new temporary objectId
    • It is not attached to any database instance

    Returns this

close

  • close(): void

  • Closes the object.

    All changes made to the object since it was opened are committed to the database, and a "closed" notification is sent. This method can be overridden by subclasses to provide specific cleanup behavior.

    Returns void

    Example

    obj.close();

createExtensionDictionary

  • createExtensionDictionary(): undefined | string

  • Creates the extension dictionary for this object if it does not already exist.

    This method closely mirrors the behavior of AcDbObject::createExtensionDictionary() in ObjectARX.

    • If the object already owns an extension dictionary, no new dictionary is created and the existing dictionary's objectId is returned.
    • Otherwise, a new AcDbDictionary is created, added to the same database, owned by this object, and its objectId is stored on this object.

    Returns undefined | string

    The objectId of the extension dictionary

    Example

    const dictId = obj.createExtensionDictionary()

dxfOut

dxfOutFields

erase

  • erase(): boolean

  • Erase the current entity from the associated database.

    Returns boolean

    — true if an entity in the database existed and has been removed, or false if the entity does not exist.

getAttr

  • getAttr(attrName: string): any

  • Gets the value of the specified attribute.

    This method will throw an exception if the specified attribute doesn't exist. Use getAttrWithoutException() if you want to handle missing attributes gracefully.

    Parameters

    • attrName: string

      The name of the attribute to retrieve

    Returns any

    The value of the specified attribute

    Throws

    When the specified attribute doesn't exist

    Example

    try {
      const value = obj.getAttr('objectId');
    } catch (error) {
      console.error('Attribute not found');
    }

getAttrWithoutException

  • getAttrWithoutException(attrName: string): any

  • Gets the value of the specified attribute without throwing an exception.

    This method returns undefined if the specified attribute doesn't exist, making it safer for optional attributes.

    Parameters

    • attrName: string

      The name of the attribute to retrieve

    Returns any

    The value of the specified attribute, or undefined if it doesn't exist

    Example

    const value = obj.getAttrWithoutException('optionalAttribute');
    if (value !== undefined) {
      // Use the value
    }

ProtectedgetEntityColor

ProtectedgetGeneralProperties

ProtectedgetLayerColor

  • getLayerColor(): null | AcCmColor

  • Gets the color of the layer this entity belongs to.

    This method retrieves the color from the layer table for the layer this entity belongs to.

    Returns null | AcCmColor

    The layer color, or undefined if the layer doesn't exist

    Example

    const layerColor = entity.getLayerColor();

getXData

  • getXData(appId: string): undefined | AcDbResultBuffer

  • Retrieves the XData associated with this object for a given application ID.

    Extended Entity Data (XData) allows applications to attach arbitrary, application-specific data to an AcDbObject. Each XData entry is identified by a registered application name (AppId) and stored as an AcDbResultBuffer.

    This method is conceptually equivalent to AcDbObject::xData() in ObjectARX, but simplified to return the entire result buffer for the specified AppId.

    Parameters

    • appId: string

      The application ID (registered AppId name) that owns the XData

    Returns undefined | AcDbResultBuffer

    The AcDbResultBuffer associated with the AppId, or undefined if no XData exists for that AppId

    Example

    const xdata = obj.getXData('MY_APP')
    if (xdata) {
      // Read values from the result buffer
    }

ProtectedhasExplicitColor

ProtectedhasExplicitLayer

ProtectedhasExplicitTransparency

removeXData

  • removeXData(appId: string): void

  • Removes the XData associated with the specified application ID.

    After removal, calls to getXData() for the same AppId will return undefined. If no XData exists for the given AppId, this method has no effect.

    This mirrors the behavior of clearing XData for a specific application in ObjectARX rather than removing all XData from the object.

    Parameters

    • appId: string

      The application ID whose XData should be removed

    Returns void

    Example

    obj.removeXData('MY_APP')

resolveEffectiveProperties

  • resolveEffectiveProperties(): void

  • Resolves the effective properties of this entity.

    This method determines the final, usable values for entity properties such as layer, linetype, lineweight, color, and other display-related attributes. If a property is not explicitly set on the entity (for example, it is undefined or specified as ByLayer / ByBlock), the value is resolved according to the current AutoCAD system variables and drawing context.

    Typical system variables involved in the resolution process include, but are not limited to:

    • CLAYER – Current layer
    • CELTYPE – Current linetype
    • CELWEIGHT – Current lineweight
    • CECOLOR – Current color

    The resolution follows AutoCAD semantics:

    • Explicitly assigned entity properties take precedence
    • ByLayer properties are inherited from the entity’s layer
    • ByBlock properties are inherited from the owning block reference
    • If no explicit value can be determined, the corresponding system variable or default drawing value is used

    This method does not change user-defined property settings; it only computes and applies the final effective values used for display, selection, and downstream processing.

    Returns void

setAttr

ProtectedsetEntityColor

setXData

  • setXData(resbuf: AcDbResultBuffer): void

  • Attaches or replaces XData for this object.

    If XData already exists for the given AppId, it is replaced by the provided AcDbResultBuffer. The caller is responsible for ensuring that:

    • The AppId is registered in the database's AppId table
    • The result buffer follows valid DXF/XData conventions (e.g. starts with a 1001 group code for the AppId)

    This method is conceptually similar to AcDbObject::setXData() in ObjectARX.

    Parameters

    Returns void

    Example

    const rb = new AcDbResultBuffer([
      { code: AcDbDxfCode.ExtendedDataRegAppName, value: 'MY_APP' },
      { code: AcDbDxfCode.ExtendedDataAsciiString, value: 'custom value' }
    ])

    obj.setXData('MY_APP', rb)

ProtectedshouldResolveColorFromCecolor

subGetGripPoints

  • subGetGripPoints(): AcGePoint3d[]

  • Gets the grip points for this entity.

    Grip points are the control points that can be used to modify the entity. This method should be overridden by subclasses to provide entity-specific grip points.

    Returns AcGePoint3d[]

    Array of grip points as 3D points

    Example

    const gripPoints = entity.subGetGripPoints();

subGetOsnapPoints

  • subGetOsnapPoints(
        osnapMode: AcDbOsnapMode,
        pickPoint: AcGePoint3dLike,
        lastPoint: AcGePoint3dLike,
        snapPoints: AcGePoint3dLike[],
        gsMark?: any,
        insertionMat?: AcGeMatrix3d,
    ): void

  • Gets the object snap points for this entity.

    Object snap points are the points that can be used for precise positioning when drawing or editing. This method should be overridden by subclasses to provide entity-specific snap points.

    Parameters

    • osnapMode: AcDbOsnapMode

      The object snap mode

    • pickPoint: AcGePoint3dLike

      The pick point

    • lastPoint: AcGePoint3dLike

      The last point

    • snapPoints: AcGePoint3dLike[]

      Array to populate with snap points

    • OptionalgsMark: any

      The object id of subentity. For now, it is used by INSERT entity only. In AutoCAD, it uses AcGiSubEntityTraits::setSelectionMarkerInput to set GS marker of the subentity involved in the object snap operation. For now, we don't provide such a GS marker mechanism yet. So passed id of subentity as GS marker. Maybe this behavior will change in the future.

    • OptionalinsertionMat: AcGeMatrix3d

      Cumulative insertion transform matrix from nested block references. This parameter is primarily used by INSERT entities.

    Returns void

    Example

    const snapPoints: AcGePoint3d[] = [];
    entity.subGetOsnapPoints(AcDbOsnapMode.Endpoint, 0, pickPoint, lastPoint, snapPoints);

subWorldDraw

transformBy

triggerModifiedEvent

worldDraw

  • worldDraw(
        renderer: AcGiRenderer<AcGiEntity>,
        delay?: boolean,
    ): undefined | AcGiEntity

  • Called by cad application when it wants the entity to draw itself in WCS (World Coordinate System) and acts as a wrapper / dispatcher around subWorldDraw(). The children class should never overidde this method.

    It executes the following logic:

    • Handles traits (color, linetype, lineweight, transparency, etc.)
    • Calls subWorldDraw() to do the actual geometry output

    Parameters

    • renderer: AcGiRenderer<AcGiEntity>

      The renderer to use for drawing

    • Optionaldelay: boolean

      The flag to delay creating one rendered entity and just create one dummy entity. Renderer can delay heavy calculation operation to avoid blocking UI when this flag is true. For now, text and mtext entity supports this flag only. Other types of entities just ignore this flag.

    Returns undefined | AcGiEntity

    The rendered entity, or undefined if drawing failed

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