gov.nasa.worldwind.layers
Class SkyGradientLayer

java.lang.Object
  gov.nasa.worldwind.avlist.AVListImpl
      gov.nasa.worldwind.WWObjectImpl
          gov.nasa.worldwind.layers.AbstractLayer
              gov.nasa.worldwind.layers.SkyGradientLayer

All Implemented Interfaces:

AVList, Disposable, MessageListener, Layer, Restorable, WWObject, PropertyChangeListener, EventListener

public class SkyGradientLayer
extends AbstractLayer

Renders an atmosphere around the globe and a sky dome at low altitude.

Note : based on a spherical globe.
Issue : Ellipsoidal globe doesnt match the spherical atmosphere everywhere.

Field Summary

protected float[]	horizonColor
protected static int	SLICES
protected static int	STACKS
protected double	thickness
protected float[]	zenithColor

Constructor Summary

SkyGradientLayer()
Renders an atmosphere around the globe

Method Summary

protected void	applyDrawProjection(DrawContext dc, OGLStackHandler ogsh)
protected void	applyDrawTransform(DrawContext dc, OGLStackHandler ogsh)
protected static Vec4	CartesianToSpherical(double x, double y, double z) Converts position in cartesian coordinates (XYZ) to spherical (radius, lat, lon) coordinates.
void	doRender(DrawContext dc)
protected void	drawSkyDome(DrawContext dc, float radius, double startLat, double endLat, int slices, int stacks, float zenithOpacity, float gradientBias) Draws the sky dome
double	getAtmosphereThickness() Get the atmosphere thickness in meter
Color	getHorizonColor() Get the horizon color
Color	getZenithColor() Get the zenith color
void	setAtmosphereThickness(double thickness) Set the atmosphere thickness in meter
void	setHorizonColor(Color color) Set the horizon color
void	setZenithColor(Color color) Set the zenith color
protected static Vec4	SphericalToCartesian(double latitude, double longitude, double radius) Converts position in spherical coordinates (lat/lon/altitude) to cartesian (XYZ) coordinates.
String	toString()
protected void	updateSkyDome(DrawContext dc)

Methods inherited from class gov.nasa.worldwind.layers.AbstractLayer

createLayerConfigElements, dispose, doPick, doPreRender, getDataFileStore, getExpiryTime, getLayerConfigParams, getMaxActiveAltitude, getMaxEffectiveAltitude, getMinActiveAltitude, getMinEffectiveAltitude, getName, getOpacity, getRestorableState, getScale, getScreenCredit, isAtMaxResolution, isEnabled, isLayerActive, isLayerConfigDocument, isLayerInView, isMultiResolution, isNetworkRetrievalEnabled, isPickEnabled, pick, preRender, render, restoreState, setDataFileStore, setEnabled, setExpiryTime, setMaxActiveAltitude, setMinActiveAltitude, setName, setNetworkRetrievalEnabled, setOpacity, setPickEnabled, setScreenCredit

Methods inherited from class gov.nasa.worldwind.WWObjectImpl

onMessage, propertyChange

Methods inherited from class gov.nasa.worldwind.avlist.AVListImpl

addPropertyChangeListener, addPropertyChangeListener, clearList, copy, firePropertyChange, firePropertyChange, getBooleanValue, getBooleanValue, getChangeSupport, getDoubleValue, getDoubleValue, getEntries, getIntegerValue, getIntegerValue, getLongValue, getLongValue, getRestorableStateForAVPair, getStringValue, getStringValue, getStringValue, getValue, getValues, hasKey, removeKey, removePropertyChangeListener, removePropertyChangeListener, setValue, setValues

Methods inherited from class java.lang.Object

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

Methods inherited from interface gov.nasa.worldwind.avlist.AVList

addPropertyChangeListener, addPropertyChangeListener, clearList, copy, firePropertyChange, firePropertyChange, getEntries, getStringValue, getValue, getValues, hasKey, removeKey, removePropertyChangeListener, removePropertyChangeListener, setValue, setValues

Methods inherited from interface java.beans.PropertyChangeListener

propertyChange

Methods inherited from interface gov.nasa.worldwind.event.MessageListener

onMessage

Field Detail

horizonColor

protected float[] horizonColor

SLICES

protected static final int SLICES

See Also:

Constant Field Values

STACKS

protected static final int STACKS

See Also:

Constant Field Values

thickness

protected double thickness

zenithColor

protected float[] zenithColor

Constructor Detail

SkyGradientLayer

public SkyGradientLayer()

Renders an atmosphere around the globe

Method Detail

applyDrawProjection

protected void applyDrawProjection(DrawContext dc,
                                   OGLStackHandler ogsh)

applyDrawTransform

protected void applyDrawTransform(DrawContext dc,
                                  OGLStackHandler ogsh)

CartesianToSpherical

protected static Vec4 CartesianToSpherical(double x,
                                           double y,
                                           double z)

Converts position in cartesian coordinates (XYZ) to spherical (radius, lat, lon) coordinates.

Parameters:

x - X coordinate

y - Y coordinate

z - Z coordinate

Returns:

a Vec4 point for the spherical coordinates {radius, lat, lon}

doRender

public void doRender(DrawContext dc)

Specified by:

doRender in class AbstractLayer

drawSkyDome

protected void drawSkyDome(DrawContext dc,
                           float radius,
                           double startLat,
                           double endLat,
                           int slices,
                           int stacks,
                           float zenithOpacity,
                           float gradientBias)

Draws the sky dome

Parameters:

dc - the current DrawContext

radius - the sky dome radius

startLat - the horizon latitude

endLat - the zenith latitude

slices - the number of slices - vertical divisions

stacks - the nuber os stacks - horizontal divisions

zenithOpacity - the sky opacity at zenith

gradientBias - determines how fast the sky goes from the horizon color to the zenith color. A value of 1 with produce a balanced gradient, a value greater then 1 will have the zenith color dominate and a value less then 1 will have the opposite effect.

getAtmosphereThickness

public double getAtmosphereThickness()

Get the atmosphere thickness in meter

Returns:

the atmosphere thickness in meter

getHorizonColor

public Color getHorizonColor()

Get the horizon color

Returns:

the horizon color

getZenithColor

public Color getZenithColor()

Get the zenith color

Returns:

the zenith color

setAtmosphereThickness

public void setAtmosphereThickness(double thickness)

Set the atmosphere thickness in meter

Parameters:

thickness - the atmosphere thickness in meter

setHorizonColor

public void setHorizonColor(Color color)

Set the horizon color

Parameters:

color - the horizon color

setZenithColor

public void setZenithColor(Color color)

Set the zenith color

Parameters:

color - the zenith color

SphericalToCartesian

protected static Vec4 SphericalToCartesian(double latitude,
                                           double longitude,
                                           double radius)

Converts position in spherical coordinates (lat/lon/altitude) to cartesian (XYZ) coordinates.

Parameters:

latitude - Latitude in decimal degrees

longitude - Longitude in decimal degrees

radius - Radius

Returns:

the corresponding Point

toString

public String toString()

Overrides:

toString in class AbstractLayer

updateSkyDome

protected void updateSkyDome(DrawContext dc)