OdDbArc Class

Class Hierarchy

Syntax

C++

class OdDbArc : public OdDbCurve;

File

DbArc.h

Description

This class implements the circular arc object (Arc entity) in the database. This class inherits the base functionality of entities. An arc is a circular segment in world space.

See Also

Working with Circular Arcs

Example of Working with the Circular Arc

OdDbCircle class, OdDbEllipse class

Group

OdDb Classes

Public Methods

	Name	Description
	OdDbArc	Builds an instance of the circular arc object.

OdDbArc Methods

	Name	Description
	center	Returns the WCS coordinates of the arc center (DXF 10) as three-dimensional point instance.
	dwgInFields	Reads the .dwg file data of this object.
	DWGMAP_DECLARE_MEMBERS
	dwgOutFields	Writes the .dwg file data of this object.
	dxfInFields	Reads the DXF data of this object.
	dxfInFields_R12	Reads the DXF R12 format data of this object.
	dxfOutFields	Writes the DXF data of this object.
	dxfOutFields_R12	Writes the DXF data of this object.
	endAngle	Returns the end angle of the circular arc in radians (DXF 51).
	getArea	Returns the area calculated for the closed figure formed by the circular arc and a line passed from the end point to the start point.
	getDistAtParam	Computes the distance along the circular arc measured from the start point to the point on circular curve specified by the parameter.
	getEcs	Returns the entity coordinate system matrix.
	getEndParam	Gets the end parameter value. The end parameter equals the end angle. Parameter is an angle measured counterclockwise from the OCS X-axis in the range 0 to 2PI radians.
	getEndPoint	Computes the WCS coordinates of the end point on the circular arc for which the parameter equals the end angle.
	getFirstDeriv	Computes the first derivative for the specified parameter of the circular arc entity and returns the three-dimensional vector instance.
	getOdGeCurve	Returns an OdGeCurve3d that is geometrically identical to this OdDbCurve.
	getParamAtDist	Computes the parameter at the distance along the circular arc. Parameter is an angle measured from the OCS X-axis in the range 0 to 2PI radians.
	getParamAtPoint	Computes the parameter at the point placed on the circular arc. Parameter is an angle measured counterclockwise from the OCS X-axis in the range 0 to 2PI radians.
	getPlane	Gets a plane in which the circular arc entity places. This method is inherited from the OdDbEntity class.
	getPointAtParam	Computes the WCS coordinates of the point on the circular arc at the specified parameter value. Parameter is an angle measured counterclockwise from the OCS X-axis in the range 0 to 2PI radians.
	getSecondDeriv	Computes the second derivative for the specified parameter of the circular arc entity and returns the three-dimensional vector instance.
	getStartParam	Gets the start parameter value. The start parameter equals equals the start angle. Parameter is an angle measured counterclockwise from the OCS X-axis in the range 0 to 2PI radians.
	getStartPoint	Computes the WCS coordinates of the start point on the circular arc for which the parameter equals the start angle.
	isClosed	Returns true if and only if this Curve object is closed.
	isPeriodic	Returns true if and only if this Curve object is periodic.
	isPlanar	Determines whether the circular arc entity is planar as a Boolean value and returns True. This method is inherited from the OdDbEntity class.
	normal	Returns the WCS unit vector which is the normal to the plane of the circular arc entity (DXF 210). The normal defines the orientation of the arc plane in world space.
	radius	Returns the radius of the circular arc (DXF 40).
	reverseCurve	Reverses this curve entity so the start becomes the end, and vice versa.
	setCenter	Sets the center point of the circular arc (DXF 10) in WCS. The initial value is (0,0,0) by default.
	setEndAngle	Sets the end angle of the circular arc in the range ±2PI radians (DXF 51). A positive value specifies the angle measured from the OCS X-axis counterclockwise. A negative value specifies the angle measured from the OCS X-axis clockwise. The initial value is zero by default.
	setFromOdGeCurve	Takes an OdGeCurve3d and sets this OdDbCurve to be geometrically identical to the OdGeCurve3d.
	setNormal	Sets the WCS normal to the plane of the circular arc entity (DXF 210). The normal defines the orientation of the arc plane in world space. The initial value is (0,0,1) by default.
	setRadius	Sets the radius of the circular arc (DXF 40). The initial value is 0.0 by default.
	setStartAngle	Sets the start angle of the circular arc in the range ±2PI radians (DXF 50). A positive value specifies the angle measured from the OCS X-axis counterclockwise. A negative value specifies the angle measured from the OCS X-axis clockwise. The initial value is zero by default.
	setThickness	Sets the thickness of the circular arc entity (DXF 39) in drawing units. Thickness is the extrusion length along the normal. A positive value extrudes along the normal. A negative value extrudes opposite from the normal. A zero value defines an arc without thickness. The initial value is zero by default.
	startAngle	Returns the start angle of the circular arc in radians (DXF 50).
	subGetClassID	overridables
	subGetTransformedCopy
	subSubentPtr
	subTransformBy
	subWorldDraw
	TD_USING	This is the overview for the TD_USING method overload.
	thickness	Returns the thickness of the circular arc entity (DXF 39) in drawing units. Thickness is the extrusion length along the normal. A positive value defines the thickness to be drawn along the normal direction. A negative value defines the thickness to be drawn in the opposite direction from the normal. A zero value defines an arc without thickness.

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