Class TLcdGML31ArcStringByBulge
 All Implemented Interfaces:
ILcdDataObject
,ILcdBounded
,ILcdCompositeCurve
,ILcdCurve
,ILcdShape
,ILcdCloneable
,ILcdDeepCloneable
,ILcdFeatured
,ILcdSelfDescribedFeatured
,Serializable
,Cloneable
 Direct Known Subclasses:
TLcdGML31ArcByBulge
 Since:
 10.0
 See Also:

Field Summary
Modifier and TypeFieldDescriptionstatic final TLcdDataProperty
Data property that maps to thebulge
element.static final TLcdDataProperty
Data property that maps to theinterpolation
attribute.static final TLcdDataProperty
Data property that maps to thenormal
element.static final TLcdDataProperty
Data property that maps to thenumArc
attribute.static final TLcdDataProperty
Data property that maps to thenumDerivativeInterior
attribute.static final TLcdDataProperty
Data property that maps to thenumDerivativesAtEnd
attribute.static final TLcdDataProperty
Data property that maps to thenumDerivativesAtStart
attribute.static final TLcdDataProperty
Data property that maps to the choice between thepos
andpointProperty
andpointRep
andposList
andcoordinates
elements.Fields inherited from interface com.luciad.shape.ILcdCurve
INTERPOLATION_CIRCLE_BY_3POINTS, INTERPOLATION_CIRCLE_BY_CENTERPOINT, INTERPOLATION_CIRCULARARC_BY_3POINTS, INTERPOLATION_CIRCULARARC_BY_BULGE, INTERPOLATION_CIRCULARARC_BY_CENTERPOINT, INTERPOLATION_ELLIPTICAL, INTERPOLATION_GEODESIC, INTERPOLATION_LINEAR, INTERPOLATION_MIXED, INTERPOLATION_RHUMB

Constructor Summary
ConstructorDescriptionTLcdGML31ArcStringByBulge
(TLcdDataType aDataType, ILcdModelReference aModelReference, int aNumArcs) Constructs a new TLcdGML31ArcStringByBulge for the given model reference.TLcdGML31ArcStringByBulge
(ILcdModelReference aModelReference, int aNumArcs) Constructs a new TLcdGML31ArcStringByBulge for the given model reference. 
Method Summary
Modifier and TypeMethodDescriptionclone()
Returns a deep clone of this object.Returns a deep clone of this object.void
computePointSFCT
(double aParam, ILcd3DEditablePoint aPointSFCT) Computes a point of the curve, defined by the given parameter.boolean
contains2D
(double aX, double aY) Checks whether thisILcdShape
contains the given point in the 2D space.boolean
contains2D
(ILcdPoint aPoint) Checks whether thisILcdShape
contains the givenILcdPoint
in the 2D space.boolean
contains3D
(double aX, double aY, double aZ) Checks whether thisILcdShape
contains the given point in the 3D space.boolean
contains3D
(ILcdPoint aPoint) Checks whether thisILcdShape
contains the givenILcdPoint
in the 3D space.Returns theILcdBounds
by which the geometry of thisILcdBounded
object is bounded.Returns the value of the property that maps to thebulge
element.Returns a list with the curve's elements.Retrieves the end point of the curve.double
Returns the angle of the curve's tangent at the end point, in degrees counterclockwise from the direction at 3 o'clock.Returns the focus point of thisILcdShape
.Returns the interpolation method used by this curve.Returns the value of the property that maps to theinterpolation
attribute.double
getLength2D
(double aParam1, double aParam2) Returns the length between two points of the curve, defined by the given parameters.int
Returns the number of intersections between this curve and a line segment defined by the two specified points.Returns the value of the property that maps to thenormal
element.Returns the value of the property that maps to thenumArc
attribute.long
Returns the value of the property that maps to thenumDerivativeInterior
attribute.long
Returns the value of the property that maps to thenumDerivativesAtEnd
attribute.long
Returns the value of the property that maps to thenumDerivativesAtStart
attribute.Returns the value of the property that maps to the choice between thepos
andpointProperty
andpointRep
andposList
andcoordinates
elements.Retrieves the start point of the curve.double
Returns the angle of the curve's tangent at the start point, in degrees counterclockwise from the direction at 3 o'clock.double
getTangent2D
(double aParam) Returns the angle of the curve's tangent in the point defined by the given parameter, in degrees counterclockwise from the direction at 3 o'clock.void
Sets the value of the property that maps to theinterpolation
attribute.void
Sets the value of the property that maps to thenumArc
attribute.void
setNumDerivativeInterior
(long aValue) Sets the value of the property that maps to thenumDerivativeInterior
attribute.void
setNumDerivativesAtEnd
(long aValue) Sets the value of the property that maps to thenumDerivativesAtEnd
attribute.void
setNumDerivativesAtStart
(long aValue) Sets the value of the property that maps to thenumDerivativesAtStart
attribute.void
setPosGroup
(Object aValue) Sets the value of the property that maps to the choice between thepos
andpointProperty
andpointRep
andposList
andcoordinates
elements.Methods inherited from class com.luciad.datamodel.TLcdFeaturedDataObject
canSetFeature, getFeature, getFeature, getFeatureCount, getFeaturedDescriptor, setFeature, setFeature
Methods inherited from class com.luciad.datamodel.TLcdDataObject
getDataType, getValue, getValue, hasValue, hasValue, setValue, setValue, toString

Field Details

INTERPOLATION_ATTR_PROPERTY
Data property that maps to theinterpolation
attribute. The possible values for this property are instances ofELcdGML31CurveInterpolation
. 
NUM_ARC_PROPERTY
Data property that maps to thenumArc
attribute. The possible values for this property are instances ofLong
. 
POS_GROUP_PROPERTY
Data property that maps to the choice between thepos
andpointProperty
andpointRep
andposList
andcoordinates
elements. The possible values for this property are instances ofList<TLcdGML31DirectPosition>
List<TLcdGML31PointProperty>
List<TLcdGML31PointProperty>
TLcdGML31DirectPositionList
TLcdGML31Coordinates

BULGE_GML_PROPERTY
Data property that maps to thebulge
element. The possible values for this property are instances ofILcdDoubleList
. 
NORMAL_PROPERTY
Data property that maps to thenormal
element. The possible values for this property are instances ofList<TLcdGML31Vector>
. 
NUM_DERIVATIVE_INTERIOR_PROPERTY
Data property that maps to thenumDerivativeInterior
attribute. The possible values for this property are instances oflong
. 
NUM_DERIVATIVES_AT_END_PROPERTY
Data property that maps to thenumDerivativesAtEnd
attribute. The possible values for this property are instances oflong
. 
NUM_DERIVATIVES_AT_START_PROPERTY
Data property that maps to thenumDerivativesAtStart
attribute. The possible values for this property are instances oflong
.


Constructor Details

TLcdGML31ArcStringByBulge
public TLcdGML31ArcStringByBulge() 
TLcdGML31ArcStringByBulge

TLcdGML31ArcStringByBulge
Constructs a new TLcdGML31ArcStringByBulge for the given model reference. The object is initialized to contain the given number of arcs. Parameters:
aModelReference
 the model reference for this objectaNumArcs
 the number of arcs

TLcdGML31ArcStringByBulge
public TLcdGML31ArcStringByBulge(TLcdDataType aDataType, ILcdModelReference aModelReference, int aNumArcs) Constructs a new TLcdGML31ArcStringByBulge for the given model reference. The object is initialized to contain the given number of arcs. Parameters:
aDataType
 the data type for this objectaModelReference
 the model reference for this objectaNumArcs
 the number of arcs


Method Details

getCurves
Description copied from interface:ILcdCompositeCurve
Returns a list with the curve's elements. Each subcurve's end point, except for the last subcurve, must coincide with the next subcurve's start point.The returned list is not guaranteed to be editable. See
ILcdEditableCompositeCurve
for an editable variant of this interface.Note that this adding curves to the result of calling this method may throw a
ClassCastException
orIllegalArgumentException
in case the class of the curve(s) to add is not compatible with the implementation of the composite curve. Implementations should specify in their documentation all restrictions that apply in this context. Specified by:
getCurves
in interfaceILcdCompositeCurve
 Returns:
 a list with the curve's elements

getStartPoint
Description copied from interface:ILcdCurve
Retrieves the start point of the curve.This is equivalent to
computePointSFCT(0)
. Specified by:
getStartPoint
in interfaceILcdCompositeCurve
 Specified by:
getStartPoint
in interfaceILcdCurve
 Overrides:
getStartPoint
in classTLcdGML31AbstractCurveSegment
 Returns:
 the start point of the curve

getEndPoint
Description copied from interface:ILcdCurve
Retrieves the end point of the curve.This is equivalent to
computePointSFCT(1)
. Specified by:
getEndPoint
in interfaceILcdCompositeCurve
 Specified by:
getEndPoint
in interfaceILcdCurve
 Overrides:
getEndPoint
in classTLcdGML31AbstractCurveSegment
 Returns:
 the end point of the curve

getStartTangent2D
public double getStartTangent2D()Description copied from interface:ILcdCurve
Returns the angle of the curve's tangent at the start point, in degrees counterclockwise from the direction at 3 o'clock.The tangent orientation is from the start point towards the rest of the shape.
This is the same as
getTangent2D(0)
. Specified by:
getStartTangent2D
in interfaceILcdCurve
 Overrides:
getStartTangent2D
in classTLcdGML31AbstractCurveSegment
 Returns:
 the curve's angle in the start point

getEndTangent2D
public double getEndTangent2D()Description copied from interface:ILcdCurve
Returns the angle of the curve's tangent at the end point, in degrees counterclockwise from the direction at 3 o'clock.The tangent orientation is from the end point, away from the curve before it.
This is the same as
getTangent2D(1)
. Specified by:
getEndTangent2D
in interfaceILcdCurve
 Overrides:
getEndTangent2D
in classTLcdGML31AbstractCurveSegment
 Returns:
 the curve's angle in the end point

getTangent2D
public double getTangent2D(double aParam) Description copied from interface:ILcdCurve
Returns the angle of the curve's tangent in the point defined by the given parameter, in degrees counterclockwise from the direction at 3 o'clock.The tangent orientation is from the point at parameter
aParam
towards the rest of the shape. The tangent at parameter 0 is the same as
ILcdCurve.getStartTangent2D()
.  The tangent at parameter 1 is the same as
ILcdCurve.getEndTangent2D()
.
 Specified by:
getTangent2D
in interfaceILcdCurve
 Overrides:
getTangent2D
in classTLcdGML31AbstractCurveSegment
 Parameters:
aParam
 a value of the closed interval [0,1] Returns:
 the curve's angle in the point defined by the given parameter
 The tangent at parameter 0 is the same as

getLength2D
public double getLength2D(double aParam1, double aParam2) Description copied from interface:ILcdCurve
Returns the length between two points of the curve, defined by the given parameters. When
aParam1 == aParam2
, the length is 0.  When
aParam1 == 0 and aParam2 == 1
, the length is the whole length of the curve.  When
aParam1 > aParam2
, the length is (aParam1 to 1
) + (0 to aParam2
).
 Specified by:
getLength2D
in interfaceILcdCurve
 Overrides:
getLength2D
in classTLcdGML31AbstractCurveSegment
 Parameters:
aParam1
 a value of the closed interval [0,1]aParam2
 a value of the closed interval [0,1] Returns:
 the length of the curve.
 When

computePointSFCT
Description copied from interface:ILcdCurve
Computes a point of the curve, defined by the given parameter. At parameter 0, the point is the same as
ILcdCurve.getStartPoint()
.  At parameter 1, the point is the same as
ILcdCurve.getEndPoint()
.
 Specified by:
computePointSFCT
in interfaceILcdCurve
 Overrides:
computePointSFCT
in classTLcdGML31AbstractCurveSegment
 Parameters:
aParam
 a value of the closed interval [0,1]aPointSFCT
 the point to store the computed curve point in
 At parameter 0, the point is the same as

getInterpolation
Description copied from interface:ILcdCurve
Returns the interpolation method used by this curve.A set of predefined constants are defined in this interface, which are used by the default
ILcdCurve
implementations provided by LuciadLightspeed.Custom implementations can define their own constants, and use them to interpret the interpolation of the curve.
 Specified by:
getInterpolation
in interfaceILcdCompositeCurve
 Specified by:
getInterpolation
in interfaceILcdCurve
 Overrides:
getInterpolation
in classTLcdGML31AbstractCurveSegment
 Returns:
 the interpolation method used by this curve.

getLineSegmentIntersectionCount
Description copied from interface:ILcdCurve
Returns the number of intersections between this curve and a line segment defined by the two specified points.This information can be used to perform containment calculations, if this curve is closed or if this curve is part of a composite closed curve. By determining the number of intersections between this curve and a line segment starting from a given point in a fixed direction, one can determine whether a point is located within the closed curve by using the evenodd rule.
 Specified by:
getLineSegmentIntersectionCount
in interfaceILcdCurve
 Overrides:
getLineSegmentIntersectionCount
in classTLcdGML31AbstractCurveSegment
 Parameters:
aP1
 the first point of the line segmentaP2
 the second point of the line segment Returns:
 the number of intersections between the curve and the line segment

getFocusPoint
Description copied from interface:ILcdShape
Returns the focus point of thisILcdShape
. Specified by:
getFocusPoint
in interfaceILcdShape
 Overrides:
getFocusPoint
in classTLcdGML31AbstractCurveSegment
 Returns:
 the focus point of this
ILcdShape
.

contains2D
Description copied from interface:ILcdShape
Checks whether thisILcdShape
contains the givenILcdPoint
in the 2D space. Only the first two dimensions of theILcdShape
and theILcdPoint
are considered. Specified by:
contains2D
in interfaceILcdShape
 Overrides:
contains2D
in classTLcdGML31AbstractCurveSegment
 Parameters:
aPoint
 theILcdPoint
to test. Returns:
 the boolean result of the containment test.
 See Also:

contains2D
public boolean contains2D(double aX, double aY) Description copied from interface:ILcdShape
Checks whether thisILcdShape
contains the given point in the 2D space. Only the first two dimensions of theILcdShape
are considered. Specified by:
contains2D
in interfaceILcdShape
 Overrides:
contains2D
in classTLcdGML31AbstractCurveSegment
 Parameters:
aX
 the x coordinate of the point.aY
 the y coordinate of the point. Returns:
 the boolean result of the containment test.

contains3D
Description copied from interface:ILcdShape
Checks whether thisILcdShape
contains the givenILcdPoint
in the 3D space. Specified by:
contains3D
in interfaceILcdShape
 Overrides:
contains3D
in classTLcdGML31AbstractCurveSegment
 Parameters:
aPoint
 theILcdPoint
to test. Returns:
 the boolean result of the containment test.
 See Also:

contains3D
public boolean contains3D(double aX, double aY, double aZ) Description copied from interface:ILcdShape
Checks whether thisILcdShape
contains the given point in the 3D space. Specified by:
contains3D
in interfaceILcdShape
 Overrides:
contains3D
in classTLcdGML31AbstractCurveSegment
 Parameters:
aX
 the x coordinate of the point.aY
 the y coordinate of the point.aZ
 the z coordinate of the point. Returns:
 the boolean result of the containment test.

getBounds
Description copied from interface:ILcdBounded
Returns theILcdBounds
by which the geometry of thisILcdBounded
object is bounded.If the geometry does not allow retrieving valid bounds (for example a polyline with 0 points) the return value is unspecified. It is highly recommended to return an
undefined
bounds. You can create undefined bounds using the default constructors ofTLcdLonLatBounds
orTLcdXYBounds
. Specified by:
getBounds
in interfaceILcdBounded
 Overrides:
getBounds
in classTLcdGML31AbstractCurveSegment
 Returns:
 the
ILcdBounds
by which the geometry of thisILcdBounded
object is bounded.

clone
Description copied from class:TLcdDataObject
Returns a deep clone of this object. This method delegates toTLcdDataObject.clone(Map)
. Specified by:
clone
in interfaceILcdCloneable
 Overrides:
clone
in classTLcdDataObject
 Returns:
 a deep clone of this object
 See Also:

clone
Description copied from class:TLcdDataObject
Returns a deep clone of this object. If the clone is not already present in the dictionary, a new instance if created as follows: First, a new instance is created using Java's clone() mechanism.
 Then, all properties of this object are cloned and set on the newly created
instance. A property is cloned as follows:
 If the property value is an
ILcdDataObject
, the value is cloned by first creating a new instance via thevalue.getDataType().newInstance()
method, and then cloning its properties one by one.  If the value implements
ILcdDeepCloneable
orILcdCloneable
then this interface is used to clone the value.  Otherwise, the property value is copied by reference.
 If the property value is an
 Specified by:
clone
in interfaceILcdDeepCloneable
 Overrides:
clone
in classTLcdDataObject
 Parameters:
aObjectDictionary
 the Object dictionary that keeps track of the objects for which a clone has already been made, and their corresponding clone Object. Returns:
 a deep clone of this object

getInterpolationAttr
Returns the value of the property that maps to theinterpolation
attribute.The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism uses the control points and control parameters to determine the position of this curve segment. For an ArcStringByBulge the interpolation is fixed as "circularArc2PointWithBulge".
 Returns:
 the value of the
INTERPOLATION_ATTR_PROPERTY
property.

setInterpolationAttr
Sets the value of the property that maps to theinterpolation
attribute.The attribute "interpolation" specifies the curve interpolation mechanism used for this segment. This mechanism uses the control points and control parameters to determine the position of this curve segment. For an ArcStringByBulge the interpolation is fixed as "circularArc2PointWithBulge".
 Parameters:
aValue
 the value to set for theINTERPOLATION_ATTR_PROPERTY
property.

getNumArc
Returns the value of the property that maps to thenumArc
attribute.The number of arcs in the arc string can be explicitly stated in this attribute. The number of control points in the arc string must be numArc + 1.
 Returns:
 the value of the
NUM_ARC_PROPERTY
property.

setNumArc
Sets the value of the property that maps to thenumArc
attribute.The number of arcs in the arc string can be explicitly stated in this attribute. The number of control points in the arc string must be numArc + 1.
 Parameters:
aValue
 the value to set for theNUM_ARC_PROPERTY
property.

getPosGroup
Returns the value of the property that maps to the choice between thepos
andpointProperty
andpointRep
andposList
andcoordinates
elements.The possible values for this property are instances of
List<TLcdGML31DirectPosition>
List<TLcdGML31PointProperty>
List<TLcdGML31PointProperty>
TLcdGML31DirectPositionList
TLcdGML31Coordinates
 Returns:
 the value of the
POS_GROUP_PROPERTY
property.

setPosGroup
Sets the value of the property that maps to the choice between thepos
andpointProperty
andpointRep
andposList
andcoordinates
elements.The possible values for this property are instances of
List<TLcdGML31DirectPosition>
List<TLcdGML31PointProperty>
List<TLcdGML31PointProperty>
TLcdGML31DirectPositionList
TLcdGML31Coordinates
 Parameters:
aValue
 the value to set for thePOS_GROUP_PROPERTY
property.

getBulgeGML
Returns the value of the property that maps to thebulge
element.The bulge controls the offset of each arc's midpoint. The "bulge" is the real number multiplier for the normal that determines the offset direction of the midpoint of each arc. The length of the bulge sequence is exactly 1 less than the length of the control point array, since a bulge is needed for each pair of adjacent points in the control point array. The bulge is not given by a distance, since it is simply a multiplier for the normal. The midpoint of the resulting arc is given by: midPoint = ((startPoint + endPoint)/2.0) + bulge*normal
 Returns:
 the value of the
BULGE_GML_PROPERTY
property.

getNormal
Returns the value of the property that maps to thenormal
element.The attribute "normal" is a vector normal (perpendicular) to the chord of the arc, the line joining the first and last point of the arc. In a 2D coordinate system, there are only two possible directions for the normal, and it is often given as a signed real, indicating its length, with a positive sign indicating a left turn angle from the chord line, and a negative sign indicating a right turn from the chord. In 3D, the normal determines the plane of the arc, along with the start and endPoint of the arc. The normal is usually a unit vector, but this is not absolutely necessary. If the normal is a zero vector, the geometric object becomes equivalent to the straight line between the two end points. The length of the normal sequence is exactly the same as for the bulge sequence, 1 less than the control point sequence length.
 Returns:
 the value of the
NORMAL_PROPERTY
property.

getNumDerivativeInterior
public long getNumDerivativeInterior()Returns the value of the property that maps to thenumDerivativeInterior
attribute.The attribute "numDerivativesInterior" specifies the type of continuity that is guaranteed interior to the curve. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity. NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
 Returns:
 the value of the
NUM_DERIVATIVE_INTERIOR_PROPERTY
property.

setNumDerivativeInterior
public void setNumDerivativeInterior(long aValue) Sets the value of the property that maps to thenumDerivativeInterior
attribute.The attribute "numDerivativesInterior" specifies the type of continuity that is guaranteed interior to the curve. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity. NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
 Parameters:
aValue
 the value to set for theNUM_DERIVATIVE_INTERIOR_PROPERTY
property.

getNumDerivativesAtEnd
public long getNumDerivativesAtEnd()Returns the value of the property that maps to thenumDerivativesAtEnd
attribute.The attribute "numDerivativesAtEnd" specifies the type of continuity between this curve segment and its successor. If this is the last curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity. NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
 Returns:
 the value of the
NUM_DERIVATIVES_AT_END_PROPERTY
property.

setNumDerivativesAtEnd
public void setNumDerivativesAtEnd(long aValue) Sets the value of the property that maps to thenumDerivativesAtEnd
attribute.The attribute "numDerivativesAtEnd" specifies the type of continuity between this curve segment and its successor. If this is the last curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity. NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
 Parameters:
aValue
 the value to set for theNUM_DERIVATIVES_AT_END_PROPERTY
property.

getNumDerivativesAtStart
public long getNumDerivativesAtStart()Returns the value of the property that maps to thenumDerivativesAtStart
attribute.The attribute "numDerivativesAtStart" specifies the type of continuity between this curve segment and its predecessor. If this is the first curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity. NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
 Returns:
 the value of the
NUM_DERIVATIVES_AT_START_PROPERTY
property.

setNumDerivativesAtStart
public void setNumDerivativesAtStart(long aValue) Sets the value of the property that maps to thenumDerivativesAtStart
attribute.The attribute "numDerivativesAtStart" specifies the type of continuity between this curve segment and its predecessor. If this is the first curve segment in the curve, one of these values, as appropriate, is ignored. The default value of "0" means simple continuity, which is a mandatory minimum level of continuity. This level is referred to as "C 0 " in mathematical texts. A value of 1 means that the function and its first derivative are continuous at the appropriate end point: "C 1 " continuity. A value of "n" for any integer means the function and its first n derivatives are continuous: "C n " continuity. NOTE: Use of these values is only appropriate when the basic curve definition is an underdetermined system. For example, line string segments cannot support continuity above C 0 , since there is no spare control parameter to adjust the incoming angle at the end points of the segment. Spline functions on the other hand often have extra degrees of freedom on end segments that allow them to adjust the values of the derivatives to support C 1 or higher continuity.
 Parameters:
aValue
 the value to set for theNUM_DERIVATIVES_AT_START_PROPERTY
property.
