com.luciad.tea.viewshed

Terrain Analysis EngineClass TLcdMinimalVisibilityComposite

java.lang.Object

com.luciad.tea.viewshed.TLcdMinimalVisibilityComposite

All Implemented Interfaces:

ILcdVisibilityComposite

public class TLcdMinimalVisibilityComposite
extends Object
implements ILcdVisibilityComposite

This ILcdVisibilityComposite will output a minimum value of all provided visibilities.

For instance, if an instance of TLcdMinimalVisibilityComposite would obtain visibilities 0.2, 0.5 and 0.8 respectively, then the result of this composite would be 0.2.

A possible use case for this composite implementation is the combination of multiple objects for the same 3D scene, each of which individually cause the scene to become more invisible in their projections away from the observer. For instance, if each object is a building, and each building has a viewshed, then combining the viewsheds of these buildings can be combined to form a single viewshed of the scene.

Figure 1: This class combines several visibilities to output their minimum.

Since:

11.0

Constructor Summary

Constructors

Constructor and Description
TLcdMinimalVisibilityComposite() Creates a new instance of TLcdMinimalVisibilityComposite

Method Summary

Modifier and Type	Method and Description
double	compose(double aPreviousVisibility, double aCurrentVisibility) Performs one compositing step by combining the previously accumulated visibility value with a new value.
double	initialVisibility() Returns the visibility value with which the compositing should be initialized.
boolean	stop(double aVisibility) Checks whether additional compositing steps are useful.

Methods inherited from class java.lang.Object

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

Constructor Detail

TLcdMinimalVisibilityComposite

public TLcdMinimalVisibilityComposite()

Creates a new instance of TLcdMinimalVisibilityComposite

Method Detail

initialVisibility

public double initialVisibility()

Description copied from interface: ILcdVisibilityComposite

Returns the visibility value with which the compositing should be initialized.

Specified by:

initialVisibility in interface ILcdVisibilityComposite

Returns:

the visibility value with which the compositing should be initialized.

compose

public double compose(double aPreviousVisibility,
                      double aCurrentVisibility)

Description copied from interface: ILcdVisibilityComposite

Performs one compositing step by combining the previously accumulated visibility value with a new value.

Specified by:

compose in interface ILcdVisibilityComposite

Parameters:

aPreviousVisibility - the previously accumulated visibility value

aCurrentVisibility - new visibility value

Returns:

the new composited visibility value

stop

public boolean stop(double aVisibility)

Description copied from interface: ILcdVisibilityComposite

Checks whether additional compositing steps are useful.

Specified by:

stop in interface ILcdVisibilityComposite

Parameters:

aVisibility - the accumulated visibility value so far.

Returns:

whether compositing should be terminated