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/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.render;
import gov.nasa.worldwind.geom.*;
import gov.nasa.worldwind.globes.Globe;
import gov.nasa.worldwind.util.*;
import java.util.*;
/**
* @author dcollins
* @version $Id: SurfaceEllipse.java 1634 2013-09-27 18:40:01Z dcollins $
*/
public class SurfaceEllipse extends AbstractSurfaceShape
{
protected static final int MIN_NUM_INTERVALS = 8;
protected static final int DEFAULT_NUM_INTERVALS = 32;
protected LatLon center = LatLon.ZERO;
protected double majorRadius;
protected double minorRadius;
protected Angle heading = Angle.ZERO;
private int intervals = DEFAULT_NUM_INTERVALS;
/**
* Constructs a new surface ellipse with the default attributes, default center location, default radii, and default
* heading.
*/
public SurfaceEllipse()
{
}
/**
* Constructs a new surface ellipse with the specified normal (as opposed to highlight) attributes, default center
* location, default radii, and default heading. Modifying the attribute reference after calling this constructor
* causes this shape's appearance to change accordingly.
*
* @param normalAttrs the normal attributes. May be null, in which case default attributes are used.
*/
public SurfaceEllipse(ShapeAttributes normalAttrs)
{
super(normalAttrs);
}
/**
* Constructs a new surface ellipse with the default attributes, the specified center location and radii (in
* meters).
*
* @param center the ellipse's center location.
* @param majorRadius the ellipse's major radius, in meters.
* @param minorRadius the ellipse's minor radius, in meters.
*
* @throws IllegalArgumentException if the center is null, or if either radii is negative.
*/
public SurfaceEllipse(LatLon center, double majorRadius, double minorRadius)
{
if (center == null)
{
String message = Logging.getMessage("nullValue.CenterIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (majorRadius < 0)
{
String message = Logging.getMessage("Geom.RadiusIsNegative", majorRadius);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (minorRadius < 0)
{
String message = Logging.getMessage("Geom.RadiusIsNegative", majorRadius);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.center = center;
this.majorRadius = majorRadius;
this.minorRadius = minorRadius;
}
/**
* Constructs a new surface ellipse with the default attributes, the specified center location, radii (in meters),
* and heading clockwise from North.
*
* @param center the ellipse's center location.
* @param majorRadius the ellipse's major radius, in meters.
* @param minorRadius the ellipse's minor radius, in meters.
* @param heading the ellipse's heading, clockwise from North.
*
* @throws IllegalArgumentException if the center or heading are null, or if either radii is negative.
*/
public SurfaceEllipse(LatLon center, double majorRadius, double minorRadius, Angle heading)
{
this(center, majorRadius, minorRadius);
if (heading == null)
{
String message = Logging.getMessage("nullValue.HeadingIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.heading = heading;
}
/**
* Constructs a new surface ellipse with the default attributes, the specified center location, radii (in meters),
* heading clockwise from North, and initial number of geometry intervals.
*
* @param center the ellipse's center location.
* @param majorRadius the ellipse's major radius, in meters.
* @param minorRadius the ellipse's minor radius, in meters.
* @param heading the ellipse's heading, clockwise from North.
* @param intervals the initial number of intervals (or slices) defining the ellipse's geometry.
*
* @throws IllegalArgumentException if the center or heading are null, if either radii is negative, or if the number
* of intervals is less than 8.
*/
public SurfaceEllipse(LatLon center, double majorRadius, double minorRadius, Angle heading, int intervals)
{
this(center, majorRadius, minorRadius, heading);
if (intervals < MIN_NUM_INTERVALS)
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", intervals);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.intervals = intervals;
}
/**
* Constructs a new surface ellipse with the specified normal (as opposed to highlight) attributes, the specified
* center location, and radii (in meters). Modifying the attribute reference after calling this constructor causes
* this shape's appearance to change accordingly.
*
* @param normalAttrs the normal attributes. May be null, in which case default attributes are used.
* @param center the ellipse's center location.
* @param majorRadius the ellipse's major radius, in meters.
* @param minorRadius the ellipse's minor radius, in meters.
*
* @throws IllegalArgumentException if the center is null, or if either radii is negative.
*/
public SurfaceEllipse(ShapeAttributes normalAttrs, LatLon center, double majorRadius, double minorRadius)
{
super(normalAttrs);
if (center == null)
{
String message = Logging.getMessage("nullValue.CenterIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (majorRadius < 0)
{
String message = Logging.getMessage("Geom.RadiusIsNegative", majorRadius);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (minorRadius < 0)
{
String message = Logging.getMessage("Geom.RadiusIsNegative", majorRadius);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.center = center;
this.majorRadius = majorRadius;
this.minorRadius = minorRadius;
}
/**
* Constructs a new surface ellipse with the specified normal (as opposed to highlight) attributes, the specified
* center location, radii (in meters), and heading clockwise from North. Modifying the attribute reference after
* calling this constructor causes this shape's appearance to change accordingly.
*
* @param normalAttrs the normal attributes. May be null, in which case default attributes are used.
* @param center the ellipse's center location.
* @param majorRadius the ellipse's major radius, in meters.
* @param minorRadius the ellipse's minor radius, in meters.
* @param heading the ellipse's heading, clockwise from North.
*
* @throws IllegalArgumentException if the center or heading are null, or if either radii is negative.
*/
public SurfaceEllipse(ShapeAttributes normalAttrs, LatLon center, double majorRadius, double minorRadius,
Angle heading)
{
this(normalAttrs, center, majorRadius, minorRadius);
if (heading == null)
{
String message = Logging.getMessage("nullValue.HeadingIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.heading = heading;
}
/**
* Constructs a new surface ellipse with the specified normal (as opposed to highlight) attributes, the specified
* center location, radii (in meters), heading clockwise from North, and initial number of geometry intervals.
* Modifying the attribute reference after calling this constructor causes this shape's appearance to change
* accordingly.
*
* @param normalAttrs the normal attributes. May be null, in which case default attributes are used.
* @param center the ellipse's center location.
* @param majorRadius the ellipse's major radius, in meters.
* @param minorRadius the ellipse's minor radius, in meters.
* @param heading the ellipse's heading, clockwise from North.
* @param intervals the initial number of intervals (or slices) defining the ellipse's geometry.
*
* @throws IllegalArgumentException if the center or heading are null, if either radii is negative, or if the number
* of intervals is less than 8.
*/
public SurfaceEllipse(ShapeAttributes normalAttrs, LatLon center, double majorRadius, double minorRadius,
Angle heading, int intervals)
{
this(normalAttrs, center, majorRadius, minorRadius, heading);
if (intervals < MIN_NUM_INTERVALS)
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", intervals);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.intervals = intervals;
}
public LatLon getCenter()
{
return this.center;
}
public void setCenter(LatLon center)
{
if (center == null)
{
String message = Logging.getMessage("nullValue.CenterIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.center = center;
this.onShapeChanged();
}
public double getMajorRadius()
{
return this.majorRadius;
}
public double getMinorRadius()
{
return this.minorRadius;
}
public void setMajorRadius(double radius)
{
if (radius < 0)
{
String message = Logging.getMessage("Geom.RadiusIsNegative", radius);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.majorRadius = radius;
this.onShapeChanged();
}
public void setMinorRadius(double radius)
{
if (radius < 0)
{
String message = Logging.getMessage("Geom.RadiusIsNegative", radius);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.minorRadius = radius;
this.onShapeChanged();
}
public void setRadii(double majorRadius, double minorRadius)
{
this.setMajorRadius(majorRadius);
this.setMinorRadius(minorRadius);
}
public Angle getHeading()
{
return this.heading;
}
public void setHeading(Angle heading)
{
if (heading == null)
{
String message = Logging.getMessage("nullValue.HeadingIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.heading = heading;
this.onShapeChanged();
}
public int getIntervals()
{
return this.intervals;
}
public void setIntervals(int intervals)
{
if (intervals < MIN_NUM_INTERVALS)
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", intervals);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.intervals = intervals;
this.onShapeChanged();
}
/**
* {@inheritDoc}
*
* Overridden to include the globe's state key in the returned state key.
*
* @see gov.nasa.worldwind.globes.Globe#getStateKey(DrawContext)
*/
@Override
public Object getStateKey(DrawContext dc)
{
// Store a copy of the active attributes to insulate the key from changes made to the shape's active attributes.
return new SurfaceShapeStateKey(this.getUniqueId(), this.lastModifiedTime, this.getActiveAttributes().copy(),
dc.getGlobe().getStateKey(dc));
}
public Iterable getLocations(Globe globe)
{
if (globe == null)
{
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
return this.computeLocations(globe, this.intervals);
}
public Position getReferencePosition()
{
return new Position(this.center, 0);
}
protected void doMoveTo(Position oldReferencePosition, Position newReferencePosition)
{
Angle heading = LatLon.greatCircleAzimuth(oldReferencePosition, this.center);
Angle pathLength = LatLon.greatCircleDistance(oldReferencePosition, this.center);
this.setCenter(LatLon.greatCircleEndPosition(newReferencePosition, heading, pathLength));
}
protected List computeLocations(Globe globe, int intervals)
{
if (globe == null)
{
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (this.majorRadius == 0 && this.minorRadius == 0)
return null;
int numLocations = 1 + Math.max(MIN_NUM_INTERVALS, intervals);
double da = (2 * Math.PI) / (numLocations - 1);
double globeRadius = globe.getRadiusAt(this.center.getLatitude(), this.center.getLongitude());
LatLon[] locations = new LatLon[numLocations];
for (int i = 0; i < numLocations; i++)
{
double angle = (i != numLocations - 1) ? i * da : 0;
double xLength = this.majorRadius * Math.cos(angle);
double yLength = this.minorRadius * Math.sin(angle);
double distance = Math.sqrt(xLength * xLength + yLength * yLength);
// azimuth runs positive clockwise from north and through 360 degrees.
double azimuth = (Math.PI / 2.0) - (Math.acos(xLength / distance) * Math.signum(yLength)
- this.heading.radians);
locations[i] = LatLon.greatCircleEndPosition(this.center, azimuth, distance / globeRadius);
}
return Arrays.asList(locations);
}
protected List> createGeometry(Globe globe, SurfaceTileDrawContext sdc)
{
if (globe == null)
{
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
double edgeIntervalsPerDegree = this.computeEdgeIntervalsPerDegree(sdc);
int intervals = this.computeNumIntervals(globe, edgeIntervalsPerDegree);
List drawLocations = this.computeLocations(globe, intervals);
if (drawLocations == null)
return null;
ArrayList> geom = new ArrayList>();
geom.add(drawLocations);
return geom;
}
protected int computeNumIntervals(Globe globe, double edgeIntervalsPerDegree)
{
if (globe == null)
{
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
int numEdgeIntervals = this.computeNumEdgeIntervals(globe, edgeIntervalsPerDegree);
return numEdgeIntervals * this.intervals;
}
protected int computeNumEdgeIntervals(Globe globe, double edgeIntervalsPerDegree)
{
if (globe == null)
{
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
int numPositions = 1 + Math.max(MIN_NUM_INTERVALS, intervals);
double radius = Math.max(this.majorRadius, this.minorRadius);
double da = (2 * Math.PI) / (numPositions - 1);
Angle edgePathLength = Angle.fromRadians(da * radius / globe.getRadiusAt(this.center));
double edgeIntervals = WWMath.clamp(edgeIntervalsPerDegree * edgePathLength.degrees,
this.minEdgeIntervals, this.maxEdgeIntervals);
return (int) Math.ceil(edgeIntervals);
}
//**************************************************************//
//******************** Restorable State ***********************//
//**************************************************************//
protected void doGetRestorableState(RestorableSupport rs, RestorableSupport.StateObject context)
{
super.doGetRestorableState(rs, context);
rs.addStateValueAsLatLon(context, "center", this.getCenter());
rs.addStateValueAsDouble(context, "majorRadius", this.getMajorRadius());
rs.addStateValueAsDouble(context, "minorRadius", this.getMinorRadius());
rs.addStateValueAsDouble(context, "headingDegrees", this.getHeading().degrees);
rs.addStateValueAsInteger(context, "intervals", this.getIntervals());
}
protected void doRestoreState(RestorableSupport rs, RestorableSupport.StateObject context)
{
super.doRestoreState(rs, context);
LatLon ll = rs.getStateValueAsLatLon(context, "center");
if (ll != null)
this.setCenter(ll);
Double d = rs.getStateValueAsDouble(context, "majorRadius");
if (d != null)
this.setMajorRadius(d);
d = rs.getStateValueAsDouble(context, "minorRadius");
if (d != null)
this.setMinorRadius(d);
d = rs.getStateValueAsDouble(context, "headingDegrees");
if (d != null)
this.setHeading(Angle.fromDegrees(d));
Integer i = rs.getStateValueAsInteger(context, "intervals");
if (d != null)
this.setIntervals(i);
}
protected void legacyRestoreState(RestorableSupport rs, RestorableSupport.StateObject context)
{
super.legacyRestoreState(rs, context);
// These properties has not changed since the last version, but they're shown here for reference.
//Double major = rs.getStateValueAsDouble(context, "majorRadius");
//Double minor = rs.getStateValueAsDouble(context, "minorRadius");
//if (major != null && minor != null)
// this.setAxisLengths(major, minor);
// This property has not changed since the last version, but it's shown here for reference.
//LatLon center = rs.getStateValueAsLatLon(context, "center");
//if (center != null)
// this.setCenter(center);
// This property has not changed since the last version, but it's shown here for reference.
//Integer intervals = rs.getStateValueAsInteger(context, "intervals");
//if (intervals != null)
// this.setIntervals(intervals);
Double od = rs.getStateValueAsDouble(context, "orientationDegrees");
if (od != null)
this.setHeading(Angle.fromDegrees(od));
}
}
