public static ViewState computeViewState(Globe globe, Vec4 eyePoint, Vec4 centerPoint, Vec4 up)
{
if (globe == null)
{
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (eyePoint == null)
{
String message = "nullValue.EyePointIsNull";
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (centerPoint == null)
{
String message = "nullValue.CenterPointIsNull";
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (up == null)
{
up = ViewUtil.getUpVector(globe, centerPoint);
}
Matrix modelview = Matrix.fromViewLookAt(eyePoint, centerPoint, up);
return(ViewUtil.computeModelCoordinates(globe, modelview, centerPoint,
eyePoint));
}
public void setOrientation(Position eyePosition, Position centerPosition)
{
if (eyePosition == null || centerPosition == null)
{
String message = Logging.getMessage("nullValue.PositionIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (this.globe == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGlobeIsNull");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
Vec4 newEyePoint = this.globe.computePointFromPosition(eyePosition);
Vec4 newCenterPoint = this.globe.computePointFromPosition(centerPosition);
if (newEyePoint == null || newCenterPoint == null)
{
String message = Logging.getMessage("View.ErrorSettingOrientation", eyePosition, centerPosition);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
// If eye lat/lon != center lat/lon, then the surface normal at the center point will be a good value
// for the up direction.
Vec4 up = this.globe.computeSurfaceNormalAtPoint(newCenterPoint);
// Otherwise, estimate the up direction by using the *current* heading with the new center position.
Vec4 forward = newCenterPoint.subtract3(newEyePoint).normalize3();
if (forward.cross3(up).getLength3() < 0.001)
{
Matrix modelview = ViewUtil.computeTransformMatrix(this.globe, eyePosition, this.heading, Angle.ZERO,
Angle.ZERO);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
up = Vec4.UNIT_Y.transformBy4(modelviewInv);
}
}
}
if (up == null)
{
String message = Logging.getMessage("View.ErrorSettingOrientation", eyePosition, centerPosition);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
ViewUtil.ViewState modelCoords = ViewUtil.computeViewState(
this.globe, newEyePoint, newCenterPoint, up);
setViewState(modelCoords);
this.updateModelViewStateID();
}
protected double computeHorizonDistance(Position eyePosition)
{
if (this.globe != null && eyePosition != null)
{
double elevation = eyePosition.getElevation();
double elevationAboveSurface = ViewUtil.computeElevationAboveSurface(this.dc, eyePosition);
return(ViewUtil.computeHorizonDistance(this.globe, Math.Max(elevation, elevationAboveSurface)));
}
return(0);
}
public void setRoll(Angle roll)
{
if (roll == null)
{
String message = Logging.getMessage("nullValue.AngleIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
this.roll = ViewUtil.normalizedRoll(roll);
this.updateModelViewStateID();
}
public void setHeading(Angle heading)
{
if (heading == null)
{
String message = Logging.getMessage("nullValue.AngleIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
this.heading = ViewUtil.normalizedHeading(heading);
this.heading = heading;
this.updateModelViewStateID();
//resolveCollisionsWithPitch();
}
/**
* Returns the most up-to-date forward vector. Unlike {@link #getForwardVector()}, this method will return the
* View's immediate forward vector.
*
* @return Vec4 of the forward axis.
*/
public Vec4 getCurrentForwardVector()
{
if (this.globe != null)
{
Matrix modelview = ViewUtil.computeTransformMatrix(this.globe, this.eyePosition,
this.heading, this.pitch, this.roll);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
return(Vec4.UNIT_NEGATIVE_Z.transformBy4(modelviewInv));
}
}
}
return(null);
}
public Vec4 getCurrentEyePoint()
{
if (this.globe != null)
{
Matrix modelview = ViewUtil.computeTransformMatrix(this.globe, this.eyePosition,
this.heading, this.pitch, this.roll);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
return(Vec4.UNIT_W.transformBy4(modelviewInv));
}
}
}
return(Vec4.ZERO);
}
public static ViewState computeModelCoordinates(Globe globe, Matrix modelTransform, Vec4 centerPoint,
Vec4 eyePoint)
{
if (globe == null)
{
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (modelTransform == null)
{
String message = "nullValue.ModelTransformIsNull";
Logging.logger().severe(message);
throw new ArgumentException(message);
}
// Compute the center position.
Position centerPos = globe.computePositionFromPoint(centerPoint);
// Compute the center position transform.
Matrix centerTransform = ViewUtil.computePositionTransform(globe, centerPos);
Matrix centerTransformInv = centerTransform.getInverse();
if (centerTransformInv == null)
{
String message = Logging.getMessage("generic.NoninvertibleMatrix");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
// Compute the heading-pitch-zoom transform.
Matrix hpzTransform = modelTransform.multiply(centerTransformInv);
// Extract the heading, pitch, and zoom values from the transform.
Angle heading = ViewUtil.computeHeading(hpzTransform);
Angle pitch = ViewUtil.computePitch(hpzTransform);
if (heading == null || pitch == null)
{
return(null);
}
Position viewPosition = globe.computePositionFromPoint(eyePoint);
return(new ViewState(viewPosition, heading, pitch, Angle.ZERO));
}
protected void setViewState(ViewUtil.ViewState modelCoords)
{
if (modelCoords != null)
{
if (modelCoords.getPosition() != null)
{
this.eyePosition = ViewUtil.normalizedEyePosition(modelCoords.getPosition());
}
if (modelCoords.getHeading() != null)
{
this.heading = ViewUtil.normalizedHeading(modelCoords.getHeading());
}
if (modelCoords.getPitch() != null)
{
this.pitch = ViewUtil.normalizedPitch(modelCoords.getPitch());
}
if (modelCoords.getRoll() != null)
{
this.roll = ViewUtil.normalizedRoll(modelCoords.getRoll());
}
}
}
public Position getCurrentEyePosition()
{
// This method is intended to compute the eye position from this view's current parameters. It can be called
// without having previously applied this view in apply().
if (this.globe != null)
{
Matrix modelview = ViewUtil.computeTransformMatrix(this.globe, this.eyePosition,
this.heading, this.pitch, this.roll);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
Vec4 eyePoint = Vec4.UNIT_W.transformBy4(modelviewInv);
return(this.globe.computePositionFromPoint(eyePoint));
}
}
}
return(Position.ZERO);
}
protected double computeNearDistance(Position eyePosition)
{
// Compute the near clip distance in order to achieve a desired depth resolution at the far clip distance. This
// computed distance is limited such that it does not intersect the terrain when possible and is never less than
// a predetermined minimum (usually one). The computed near distance automatically scales with the resolution of
// the OpenGL depth buffer.
int depthBits = this.dc.getGLRuntimeCapabilities().getDepthBits();
double nearDistance = ViewUtil.computePerspectiveNearDistance(this.farClipDistance, DEFAULT_DEPTH_RESOLUTION,
depthBits);
// Prevent the near clip plane from intersecting the terrain.
if (eyePosition != null && this.dc != null)
{
double distanceToSurface = ViewUtil.computeElevationAboveSurface(this.dc, eyePosition);
if (distanceToSurface > 0)
{
double maxNearDistance = ViewUtil.computePerspectiveNearDistance(this.fieldOfView, distanceToSurface);
if (nearDistance > maxNearDistance)
{
nearDistance = maxNearDistance;
}
}
else
{
nearDistance = MINIMUM_NEAR_DISTANCE;
}
}
// Prevent the near clip plane from becoming unnecessarily small. A very small clip plane is not useful for
// rendering the World Wind scene, and significantly reduces the depth precision in the majority of the scene.
if (nearDistance < MINIMUM_NEAR_DISTANCE)
{
nearDistance = MINIMUM_NEAR_DISTANCE;
}
return(nearDistance);
}
public double computePixelSizeAtDistance(double distance)
{
return(ViewUtil.computePixelSizeAtDistance(distance, this.fieldOfView, this.viewport));
}
public Line computeRayFromScreenPoint(double x, double y)
{
return(ViewUtil.computeRayFromScreenPoint(this, x, y,
this.modelview, this.projection, this.viewport));
}