gov.nasa.worldwind.render
Class Ellipsoid

java.lang.Object
  gov.nasa.worldwind.avlist.AVListImpl
      gov.nasa.worldwind.WWObjectImpl
          gov.nasa.worldwind.render.AbstractShape
              gov.nasa.worldwind.render.RigidShape
                  gov.nasa.worldwind.render.Ellipsoid

All Implemented Interfaces:

AVList, MessageListener, Exportable, ExtentHolder, Movable, GeographicExtent, Highlightable, OrderedRenderable, Renderable, Restorable, WWObject, PropertyChangeListener, EventListener

public class Ellipsoid
extends RigidShape

A general ellipsoid volume defined by a center position and the three ellipsoid axis radii. If A is the radius in the north-south direction, and b is the radius in the east-west direction, and c is the radius in the vertical direction (increasing altitude), then A == B == C defines a sphere, A == B > C defines a vertically flattened spheroid (disk-shaped), A == B < C defines a vertically stretched spheroid.

Nested Class Summary

Nested classes/interfaces inherited from class gov.nasa.worldwind.render.RigidShape

RigidShape.Offsets, RigidShape.ShapeData

Nested classes/interfaces inherited from class gov.nasa.worldwind.render.AbstractShape

AbstractShape.AbstractShapeData

Field Summary

protected static int	DEFAULT_SUBDIVISIONS
protected int	subdivisions

Fields inherited from class gov.nasa.worldwind.render.RigidShape

centerPosition, DEFAULT_GEOMETRY_CACHE_SIZE, detailHint, eastWestRadius, faceCount, GEOMETRY_CACHE_KEY, GEOMETRY_CACHE_NAME, geometryBuilder, heading, imageSources, northSouthRadius, offsets, offsetTextureCoords, previousIntersectionGlobeStateKey, previousIntersectionShapeData, previousIntersectionTerrain, renderExtent, roll, skewEastWest, skewNorthSouth, textures, tilt, verticalRadius

Fields inherited from class gov.nasa.worldwind.render.AbstractShape

activeAttributes, altitudeMode, BEogsh, currentData, DEFAULT_ALTITUDE_MODE, DEFAULT_GEOMETRY_GENERATION_INTERVAL, DEFAULT_HIGHLIGHT_MATERIAL, DEFAULT_INTERIOR_MATERIAL, DEFAULT_OUTLINE_MATERIAL, DEFAULT_OUTLINE_PICK_WIDTH, defaultAttributes, delegateOwner, enableBatchPicking, enableBatchRendering, enableDepthOffset, highlightAttrs, highlighted, maxExpiryTime, minExpiryTime, normalAttrs, outlinePickWidth, outlineShapeRenderer, pickLayer, pickSupport, referencePosition, sector, shapeDataCache, VBO_THRESHOLD, viewDistanceExpiration, visible

Fields inherited from interface gov.nasa.worldwind.Exportable

FORMAT_NOT_SUPPORTED, FORMAT_PARTIALLY_SUPPORTED, FORMAT_SUPPORTED

Constructor Summary

Ellipsoid()
Construct a default ellipsoid with centerPosition ZERO and radii all equal to one.

Ellipsoid(Position centerPosition, double northSouthRadius, double verticalRadius, double eastWestRadius)
Construct an ellipsoid from a specified center position and axes lengths.

Ellipsoid(Position centerPosition, double northSouthRadius, double verticalRadius, double eastWestRadius, Angle heading, Angle tilt, Angle roll)
Construct an ellipsoid from a specified center position, axes lengths and rotation angles.

Method Summary

protected double	computeDetailThreshold() Computes a threshold value, based on the current detailHint, for use in the sufficientDetail() calculation.
protected void	computeSubdivisions(DrawContext dc, RigidShape.ShapeData shapeData) Computes the number of subdivisions necessary to achieve the expected Level of Detail given the shape's relationship to the viewer.
protected RigidShape.ShapeData	createIntersectionGeometry(Terrain terrain)
protected void	doExportAsKML(XMLStreamWriter xmlWriter) Exports shape-specific fields.
protected void	drawGeometry(DrawContext dc, int mode, int count, int type, Buffer elementBuffer, RigidShape.ShapeData shapeData, int face) Renders the Ellipsoid, using data from the provided buffer and the given parameters.
int	getSubdivisions()
String	isExportFormatSupported(String mimeType) No export formats supported.
protected void	makeEllipsoid(double a, double b, double c, int subdivisions, Geometry dest) Generates ellipsoidal geometry, including the vertices, indices, normals and texture coordinates, tessellated with the specified number of divisions.
protected void	makeGeometry(RigidShape.ShapeData shapeData) Sets the Geometry mesh for this Ellipsoid, either by pulling it from the geometryCache, or by creating it anew if the appropriate geometry does not yet exist in the cache.
protected void	makeUnitSphere(int subdivisions, Geometry dest) Generates a unit sphere geometry, including the vertices, indices, normals and texture coordinates, tessellated with the specified number of divisions.
protected boolean	mustRegenerateGeometry(DrawContext dc) Indicates whether this shape's renderable geometry must be recomputed, either as a result of an attribute or property change or the expiration of the geometry regeneration interval.
protected boolean	sufficientDetail(DrawContext dc, int subdivisions, RigidShape.ShapeData shapeData)

Methods inherited from class gov.nasa.worldwind.render.RigidShape

beginDrawing, clearCachedVbos, clearIntersectionGeometry, computeExtent, computeReferencePoint, computeReferencePoint, computeRenderMatrix, computeRenderMatrix, computeRenderMatrixInverse, computeTransformedVertices, createCacheEntry, doDrawInterior, doDrawOutline, doGetRestorableState, doMakeOrderedRenderable, doRestoreState, drawGeometry, fillVBO, getCenterPosition, getCurrentShapeData, getDetailHint, getEastWestRadius, getExtent, getFaceCount, getGeometryBuilder, getGeometryCache, getHeading, getImageSource, getNorthSouthRadius, getOffsets, getReferencePosition, getRestorableState, getRoll, getSector, getSkewEastWest, getSkewNorthSouth, getTexture, getTilt, getVboIds, getVerticalRadius, initialize, intersect, intersect, intersect, intersectFace, isOrderedRenderableValid, isSameAsPreviousTerrain, moveTo, mustApplyTexture, mustApplyTexture, reset, restoreState, setCenterPosition, setDetailHint, setEastWestRadius, setFaceCount, setHeading, setImageSource, setImageSources, setImageSources, setModelViewMatrix, setNorthSouthRadius, setOffset, setRoll, setSkewEastWest, setSkewNorthSouth, setTexture, setTilt, setUpGeometryCache, setVerticalRadius

Methods inherited from class gov.nasa.worldwind.render.AbstractShape

addOrderedRenderable, checkViewDistanceExpiration, computeExtentFromPositions, computePoint, countTriangleVertices, createPickedObject, determineActiveAttributes, doDrawOrderedRenderable, drawBatched, drawInterior, drawOrderedRenderable, drawOutline, endDrawing, export, exportAsKML, getActiveAttributes, getAltitudeMode, getAttributes, getCurrentData, getDelegateOwner, getDistanceFromEye, getExtent, getGeometryRegenerationInterval, getHighlightAttributes, getOutlinePickWidth, getReferencePoint, getVboIds, intersectsFrustum, isEnableBatchPicking, isEnableBatchRendering, isEnableDepthOffset, isHighlighted, isTerrainDependent, isViewDistanceExpiration, isVisible, makeOrderedRenderable, makeTexture, move, mustApplyLighting, mustApplyLighting, mustCreateNormals, mustCreateNormals, mustDrawInterior, mustDrawOutline, pick, prepareToDrawInterior, prepareToDrawOutline, render, setAltitudeMode, setAttributes, setDelegateOwner, setEnableBatchPicking, setEnableBatchRendering, setEnableDepthOffset, setGeometryRegenerationInterval, setHighlightAttributes, setHighlighted, setOutlinePickWidth, setReferencePosition, setViewDistanceExpiration, setVisible, shouldUseVBOs

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, toString, 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

Field Detail

DEFAULT_SUBDIVISIONS

protected static final int DEFAULT_SUBDIVISIONS

See Also:

Constant Field Values

subdivisions

protected int subdivisions

Constructor Detail

Ellipsoid

public Ellipsoid()

Construct a default ellipsoid with centerPosition ZERO and radii all equal to one.

Ellipsoid

public Ellipsoid(Position centerPosition,
                 double northSouthRadius,
                 double verticalRadius,
                 double eastWestRadius)

Construct an ellipsoid from a specified center position and axes lengths.

Parameters:

centerPosition - the ellipsoid's center position.

northSouthRadius - the ellipsoid's north-south radius, in meters.

verticalRadius - the ellipsoid's vertical radius, in meters.

eastWestRadius - the ellipsoid's east-west radius, in meters.

Throws:

IllegalArgumentException - if the center position is null or any of the radii are not greater than 0.

Ellipsoid

public Ellipsoid(Position centerPosition,
                 double northSouthRadius,
                 double verticalRadius,
                 double eastWestRadius,
                 Angle heading,
                 Angle tilt,
                 Angle roll)

Construct an ellipsoid from a specified center position, axes lengths and rotation angles. All angles are specified in degrees and positive angles are counter-clockwise.

Parameters:

centerPosition - the ellipsoid's center position.

northSouthRadius - the ellipsoid's north-south radius, in meters.

verticalRadius - the ellipsoid's vertical radius, in meters.

eastWestRadius - the ellipsoid's east-west radius, in meters.

heading - the ellipsoid's azimuth, its rotation about its vertical axis.

tilt - the ellipsoids pitch, its rotation about its east-west axis.

roll - the ellipsoid's roll, its rotation about its north-south axis.

Method Detail

computeDetailThreshold

protected double computeDetailThreshold()

Computes a threshold value, based on the current detailHint, for use in the sufficientDetail() calculation.

Returns:

the detailThreshold

computeSubdivisions

protected void computeSubdivisions(DrawContext dc,
                                   RigidShape.ShapeData shapeData)

Computes the number of subdivisions necessary to achieve the expected Level of Detail given the shape's relationship to the viewer.

Specified by:

computeSubdivisions in class RigidShape

Parameters:

dc - the current drawContext.

shapeData - the current globe-specific shape data

createIntersectionGeometry

protected RigidShape.ShapeData createIntersectionGeometry(Terrain terrain)

Specified by:

createIntersectionGeometry in class RigidShape

doExportAsKML

protected void doExportAsKML(XMLStreamWriter xmlWriter)
                      throws IOException,
                             XMLStreamException

Description copied from class: AbstractShape

Exports shape-specific fields.

Specified by:

doExportAsKML in class AbstractShape

Parameters:

xmlWriter - the export writer to write to.

Throws:

IOException - if an IO error occurs while writing to the output destination.

XMLStreamException - if an exception occurs converting this shape's fields to XML.

drawGeometry

protected void drawGeometry(DrawContext dc,
                            int mode,
                            int count,
                            int type,
                            Buffer elementBuffer,
                            RigidShape.ShapeData shapeData,
                            int face)

Renders the Ellipsoid, using data from the provided buffer and the given parameters.

Specified by:

drawGeometry in class RigidShape

Parameters:

dc - the current draw context

mode - the render mode

count - the number of elements to be drawn

type - the data type of the elements to be drawn

elementBuffer - the buffer containing the list of elements to be drawn

shapeData - this shape's current globe-specific shape data

face - the shape face currently being drawn

getSubdivisions

public int getSubdivisions()

Specified by:

getSubdivisions in class RigidShape

isExportFormatSupported

public String isExportFormatSupported(String mimeType)

No export formats supported.

Specified by:

isExportFormatSupported in interface Exportable

Overrides:

isExportFormatSupported in class AbstractShape

Parameters:

mimeType - Desired export format.

Returns:

One of Exportable.FORMAT_SUPPORTED, Exportable.FORMAT_NOT_SUPPORTED, or Exportable.FORMAT_PARTIALLY_SUPPORTED.

See Also:

Exportable.export(String, Object)

makeEllipsoid

protected void makeEllipsoid(double a,
                             double b,
                             double c,
                             int subdivisions,
                             Geometry dest)

Generates ellipsoidal geometry, including the vertices, indices, normals and texture coordinates, tessellated with the specified number of divisions.

Parameters:

a - the Ellipsoid radius along the east-west axis

b - the Ellipsoid radius along the vertical axis

c - the Ellipsoid radius along the north-south axis

subdivisions - the number of times to subdivide the unit sphere geometry

dest - the Geometry container to hold the computed points, etc.

makeGeometry

protected void makeGeometry(RigidShape.ShapeData shapeData)

Sets the Geometry mesh for this Ellipsoid, either by pulling it from the geometryCache, or by creating it anew if the appropriate geometry does not yet exist in the cache.

Specified by:

makeGeometry in class RigidShape

Parameters:

shapeData - the current shape data.

makeUnitSphere

protected void makeUnitSphere(int subdivisions,
                              Geometry dest)

Generates a unit sphere geometry, including the vertices, indices, normals and texture coordinates, tessellated with the specified number of divisions.

Parameters:

subdivisions - the number of times to subdivide the unit sphere geometry

dest - the Geometry container to hold the computed points, etc.

mustRegenerateGeometry

protected boolean mustRegenerateGeometry(DrawContext dc)

Description copied from class: AbstractShape

Indicates whether this shape's renderable geometry must be recomputed, either as a result of an attribute or property change or the expiration of the geometry regeneration interval.

A AbstractShape.AbstractShapeData must be current when this method is called.

Overrides:

mustRegenerateGeometry in class RigidShape

Parameters:

dc - the current draw context.

Returns:

true if this shape's geometry must be regenerated, otherwise false.

sufficientDetail

protected boolean sufficientDetail(DrawContext dc,
                                   int subdivisions,
                                   RigidShape.ShapeData shapeData)