com.luciad.geometry.spherical

Advanced GIS EngineClass TLcdSphericalConstructiveGeometry

java.lang.Object

com.luciad.geometry.spherical.TLcdSphericalConstructiveGeometry

All Implemented Interfaces:

ILcdConstructiveGeometry

public class TLcdSphericalConstructiveGeometry
extends Object
implements ILcdConstructiveGeometry

ILcdConstructiveGeometry implementation for spherical topology. This implementation supports the following shapes:

• ILcdPoint
• ILcdPolypoint
• ILcdPolyline
• ILcdPolygon
• ILcdComplexPolygon
• ILcdShapeList
• ILcdSurface (Outer and inner rings must be instances of ILcdPolygon)
• TLcdXYGeoBuffer
• TLcdLonLatGeoBuffer
• TLcdLonLatHeightVariableGeoBuffer
• TLcdLonLatBuffer
• TLcdLonLatHeightBuffer

Depending on the type of input shapes and the interaction of the input shapes, the output can be any of the following shapes or an ILcdShapeList containing the following shapes:

• ILcdPoint
• ILcdPolyline
• ILcdPolygon
• ILcdComplexPolygon
• ILcdShapeList

Since:

10.1

Constructor Summary

Constructors

Constructor and Description
TLcdSphericalConstructiveGeometry(double aRadius, double aTolerance) Creates a new TLcdSphericalConstructiveGeometry.

Method Summary

Modifier and Type	Method and Description
ILcdShape	convexHull(ILcdShape... aShapes) Finds the convex hull of the given shape or shapes.
ILcdShape	difference(ILcdShape... aShapes) Calculates the difference of the given shapes.
ILcdShape	intersection(ILcdShape... aShapes) Calculates the intersection of the given shapes.
ILcdShape	symmetricDifference(ILcdShape... aShapes) Calculates the symmetric difference of the given shapes.
ILcdShape	union(ILcdShape... aShapes) Calculates the union of the given shapes.

Methods inherited from class java.lang.Object

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

Constructor Detail

TLcdSphericalConstructiveGeometry

public TLcdSphericalConstructiveGeometry(double aRadius,
                                         double aTolerance)

Creates a new TLcdSphericalConstructiveGeometry.

The tolerance allows the calculation to treat nearby points of the two different shapes, as if they are coincident. If the tolerance is too large, incorrect results can occur. The calculations are most stable if the tolerance is smaller than the length of the smallest line segment.

Parameters:

aRadius - The radius of the sphere on which the geometry is defined, in meters.

aTolerance - The tolerance in which points are considered equal, in meters.

Method Detail

union

public ILcdShape union(ILcdShape... aShapes)

Description copied from interface: ILcdConstructiveGeometry

Calculates the union of the given shapes. The resulting shape contains all points that are contained in any of the given shapes. The returned shape may be any type of shape, or a shape list of multiple shapes, depending on what is required to describe the resulting shape.

Red and blue shapes are the input shapes. The green shape is the result.

Specified by:

union in interface ILcdConstructiveGeometry

Parameters:

aShapes - The input shapes. There must be at least two shapes.

Returns:

A shape representing the union of the input shapes

intersection

public ILcdShape intersection(ILcdShape... aShapes)

Description copied from interface: ILcdConstructiveGeometry

Calculates the intersection of the given shapes. The resulting shape only contains points that are contained in all of the given shapes. The returned shape may be any type of shape, or a shape list of multiple shapes, depending on what is required to describe the resulting shape.

Red and blue shapes are the input shapes. The green shape is the result.

Specified by:

intersection in interface ILcdConstructiveGeometry

Parameters:

aShapes - The input shapes. There must be at least two shapes.

Returns:

A shape representing the intersection of the input shapes

difference

public ILcdShape difference(ILcdShape... aShapes)

Description copied from interface: ILcdConstructiveGeometry

Calculates the difference of the given shapes. All next shapes are subtracted from the first shape. The returned shape may be any type of shape, or a shape list of multiple shapes, depending on what is required to describe the resulting shape.

Red and blue shapes are the input shapes. The green shape is the result.

Specified by:

difference in interface ILcdConstructiveGeometry

Parameters:

aShapes - The input shapes. There must be at least two shapes.

Returns:

A shape representing the difference of the input shapes

symmetricDifference

public ILcdShape symmetricDifference(ILcdShape... aShapes)

Description copied from interface: ILcdConstructiveGeometry

Calculates the symmetric difference of the given shapes. The resulting shape contains all points that are inside an odd amount of the input shapes. This can be compared to the XOR boolean operation. The returned shape may be any type of shape, or a shape list of multiple shapes, depending on what is required to describe the resulting shape.

Red and blue shapes are the input shapes. The green shape is the result.

Specified by:

symmetricDifference in interface ILcdConstructiveGeometry

Parameters:

aShapes - The input shapes. There must be at least two shapes.

Returns:

A shape representing the symmetric difference of the input shapes

convexHull

public ILcdShape convexHull(ILcdShape... aShapes)

Description copied from interface: ILcdConstructiveGeometry

Finds the convex hull of the given shape or shapes. The convex hull is defined as the smallest convex polygon that contains the shapes. If multiple shapes are given, the result is the convex hull around the points of all shapes together.

Convex hull of the United Kingdom.

Specified by:

convexHull in interface ILcdConstructiveGeometry

Parameters:

aShapes - the shape or shapes for which to find the convex hull.

Returns:

a shape representing the convex hull as a polygon.