Package com.luciad.geometry.topology.cartesian

Class TLcdCartesianAdvancedBinaryTopology

java.lang.Object

com.luciad.geometry.topology.cartesian.TLcdCartesianAdvancedBinaryTopology

All Implemented Interfaces:

ILcd2DAdvancedBinaryTopology

public class TLcdCartesianAdvancedBinaryTopology
extends Object
implements ILcd2DAdvancedBinaryTopology

Implementation of ILcd2DAdvancedBinaryTopology for 2D Cartesian geometry. This implementation currently supports instances of the following interfaces:

• ILcdPoint,
• ILcdPolyline,
• ILcdPolygon,
• ILcdComplexPolygon,
• ILcdArc,
• ILcdCircularArc,
• ILcdEllipse,
• ILcdCircle,
• ILcdBounds,
• ILcdArcBand,
• ILcdGeoBuffer.

Geodesic geometry is supported by this implementation. Geodesic lines are treated as straight lines.

Performance

The current implementation caches (intermediate) results for ILcdShape instances which implement the ILcdCache interface. When performing repeated checks with the same shape or shapes, it is generally more efficient to reuse the same ILcd2DAdvancedBinaryTopology object, instead of creating a new instance for every check.

Since:

10.0

Constructor Summary

Constructors

Constructor	Description
TLcdCartesianAdvancedBinaryTopology()	Default constructor for TLcdCartesianAdvancedBinaryTopology
TLcdCartesianAdvancedBinaryTopology(double aTolerance)	Constructor for TLcdCartesianAdvancedBinaryTopology allowing to specify a tolerance.

Method Summary

Modifier and Type	Method	Description
boolean	checkTopology(ILcdShape aShape1, ILcdShape aShape2, ILcdIntersectionMatrixPattern aMatrixPattern)	Checks whether the two given shapes satisfy the binary topology relation defined by the given matrix pattern.
ILcdIntersectionMatrix	computeIntersectionMatrix(ILcdShape aShape1, ILcdShape aShape2)	Computes the intersection matrix of the two given shapes.
double	getTolerance()	Returns the tolerance value used in the binary topology computations when checking the equality of two points.
void	setTolerance(double aTolerance)	Sets the tolerance value used in the binary topology computations when checking the equality of two points.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

TLcdCartesianAdvancedBinaryTopology

public TLcdCartesianAdvancedBinaryTopology()

Default constructor for TLcdCartesianAdvancedBinaryTopology

TLcdCartesianAdvancedBinaryTopology

public TLcdCartesianAdvancedBinaryTopology(double aTolerance)

Constructor for TLcdCartesianAdvancedBinaryTopology allowing to specify a tolerance.

In some cases, the result obtained when checking the topological relation between two shapes depends on the accuracy of the data used to represent both shapes.

For example, you would expect that neighboring countries touch but not overlap. However, if the contours of the polygons used to represent both countries slightly cross at the common border (due to small errors in the data), the calculations would lead to the opposite result.

This constructor allow you to set a tolerance value which is taken into account in the topology calculations. Points that lie within this tolerance value from each other are considered to be coincident.

Parameters:

aTolerance - tolerance value used to determine the equality of two points in the topology calculations of two shapes. This value is expressed in model coordinate units of these shapes.

Method Details

computeIntersectionMatrix

public ILcdIntersectionMatrix computeIntersectionMatrix(ILcdShape aShape1,
 ILcdShape aShape2)

Description copied from interface: ILcd2DAdvancedBinaryTopology

Computes the intersection matrix of the two given shapes. Both shapes must be in the same coordinate system.

Specified by:

computeIntersectionMatrix in interface ILcd2DAdvancedBinaryTopology

Parameters:

aShape1 - the first shape

aShape2 - the second shape

Returns:

the intersection matrix of the two given shapes

checkTopology

public boolean checkTopology(ILcdShape aShape1,
 ILcdShape aShape2,
 ILcdIntersectionMatrixPattern aMatrixPattern)

Description copied from interface: ILcd2DAdvancedBinaryTopology

Checks whether the two given shapes satisfy the binary topology relation defined by the given matrix pattern. Both shapes must be in the same coordinate system.

Specified by:

checkTopology in interface ILcd2DAdvancedBinaryTopology

Parameters:

aShape1 - the first shape

aShape2 - the second shape

aMatrixPattern - the matrix pattern defining the binary topology relation to be checked

Returns:

true if the binary topology relation defined by aMatrixPattern holds true for aShape1 and aShape2, false otherwise.

getTolerance

public double getTolerance()

Returns the tolerance value used in the binary topology computations when checking the equality of two points.

Returns:

the tolerance value used in the binary topology computations when checking the equality of two points.

setTolerance

public void setTolerance(double aTolerance)

Sets the tolerance value used in the binary topology computations when checking the equality of two points. The tolerance value should be expressed in model coordinate units of the two shapes for which topology computations are carried out.

Parameters:

aTolerance - the tolerance value used in the binary topology computations.