/**
* Setup the view to a first person mode (zoom = 0)
*
* @param view the orbit view to set into a first person view.
*/
protected void setupFirstPersonView(OrbitView view) {
if (view.getZoom() == 0) // already in first person mode
return;
Vec4 eyePoint = view.getEyePoint();
// Center pos at eye pos
Position centerPosition = wwd.getModel().getGlobe().computePositionFromPoint(eyePoint);
// Compute pitch and heading relative to center position
Vec4 normal =
wwd.getModel()
.getGlobe()
.computeSurfaceNormalAtLocation(
centerPosition.getLatitude(), centerPosition.getLongitude());
Vec4 north =
wwd.getModel()
.getGlobe()
.computeNorthPointingTangentAtLocation(
centerPosition.getLatitude(), centerPosition.getLongitude());
// Pitch
view.setPitch(Angle.POS180.subtract(view.getForwardVector().angleBetween3(normal)));
// Heading
Vec4 perpendicular = view.getForwardVector().perpendicularTo3(normal);
Angle heading = perpendicular.angleBetween3(north);
double direction = Math.signum(-normal.cross3(north).dot3(perpendicular));
view.setHeading(heading.multiply(direction));
// Zoom
view.setZoom(0);
// Center pos
view.setCenterPosition(centerPosition);
}
/**
* Reset the view to an orbit view state if in first person mode (zoom = 0)
*
* @param view the orbit view to reset
*/
protected void resetOrbitView(OrbitView view) {
if (view.getZoom() > 0) // already in orbit view mode
return;
// Find out where on the terrain the eye is looking at in the viewport center
// TODO: if no terrain is found in the viewport center, iterate toward viewport bottom until it
// is found
Vec4 centerPoint = computeSurfacePoint(view, view.getHeading(), view.getPitch());
// Reset the orbit view center point heading, pitch and zoom
if (centerPoint != null) {
Vec4 eyePoint = view.getEyePoint();
// Center pos on terrain surface
Position centerPosition = wwd.getModel().getGlobe().computePositionFromPoint(centerPoint);
// Compute pitch and heading relative to center position
Vec4 normal =
wwd.getModel()
.getGlobe()
.computeSurfaceNormalAtLocation(
centerPosition.getLatitude(), centerPosition.getLongitude());
Vec4 north =
wwd.getModel()
.getGlobe()
.computeNorthPointingTangentAtLocation(
centerPosition.getLatitude(), centerPosition.getLongitude());
// Pitch
view.setPitch(Angle.POS180.subtract(view.getForwardVector().angleBetween3(normal)));
// Heading
Vec4 perpendicular = view.getForwardVector().perpendicularTo3(normal);
Angle heading = perpendicular.angleBetween3(north);
double direction = Math.signum(-normal.cross3(north).dot3(perpendicular));
view.setHeading(heading.multiply(direction));
// Zoom
view.setZoom(eyePoint.distanceTo3(centerPoint));
// Center pos
view.setCenterPosition(centerPosition);
}
}
protected void updateView(ScreenAnnotation control, String controlType) {
if (this.wwd == null) return;
if (!(this.wwd.getView() instanceof OrbitView)) return;
OrbitView view = (OrbitView) this.wwd.getView();
view.stopAnimations();
view.stopMovement();
if (controlType.equals(AVKey.VIEW_PAN)) {
resetOrbitView(view);
// Go some distance in the control mouse direction
Angle heading = computePanHeading(view, control);
Angle distance = computePanAmount(this.wwd.getModel().getGlobe(), view, control, panStep);
LatLon newViewCenter =
LatLon.greatCircleEndPosition(view.getCenterPosition(), heading, distance);
// Turn around if passing by a pole - TODO: better handling of the pole crossing situation
if (this.isPathCrossingAPole(newViewCenter, view.getCenterPosition()))
view.setHeading(Angle.POS180.subtract(view.getHeading()));
// Set new center pos
view.setCenterPosition(new Position(newViewCenter, view.getCenterPosition().getElevation()));
} else if (controlType.equals(AVKey.VIEW_LOOK)) {
setupFirstPersonView(view);
Angle heading = computeLookHeading(view, control, headingStep);
Angle pitch = computeLookPitch(view, control, pitchStep);
// Check whether the view will still point at terrain
Vec4 surfacePoint = computeSurfacePoint(view, heading, pitch);
if (surfacePoint != null) {
// Change view state
final Position eyePos = view.getEyePosition(); // Save current eye position
view.setHeading(heading);
view.setPitch(pitch);
view.setZoom(0);
view.setCenterPosition(eyePos); // Set center at the eye position
}
} else if (controlType.equals(AVKey.VIEW_ZOOM_IN)) {
resetOrbitView(view);
view.setZoom(computeNewZoom(view, -zoomStep));
} else if (controlType.equals(AVKey.VIEW_ZOOM_OUT)) {
resetOrbitView(view);
view.setZoom(computeNewZoom(view, zoomStep));
} else if (controlType.equals(AVKey.VIEW_HEADING_LEFT)) {
resetOrbitView(view);
view.setHeading(view.getHeading().addDegrees(headingStep));
} else if (controlType.equals(AVKey.VIEW_HEADING_RIGHT)) {
resetOrbitView(view);
view.setHeading(view.getHeading().addDegrees(-headingStep));
} else if (controlType.equals(AVKey.VIEW_PITCH_UP)) {
resetOrbitView(view);
if (view.getPitch().degrees >= pitchStep)
view.setPitch(view.getPitch().addDegrees(-pitchStep));
} else if (controlType.equals(AVKey.VIEW_PITCH_DOWN)) {
resetOrbitView(view);
if (view.getPitch().degrees <= 90 - pitchStep)
view.setPitch(view.getPitch().addDegrees(pitchStep));
} else if (controlType.equals(AVKey.VIEW_FOV_NARROW)) {
if (view.getFieldOfView().degrees / fovStep >= 4)
view.setFieldOfView(view.getFieldOfView().divide(fovStep));
} else if (controlType.equals(AVKey.VIEW_FOV_WIDE)) {
if (view.getFieldOfView().degrees * fovStep < 120)
view.setFieldOfView(view.getFieldOfView().multiply(fovStep));
} else if (controlType.equals(AVKey.VERTICAL_EXAGGERATION_UP)) {
SceneController sc = this.wwd.getSceneController();
sc.setVerticalExaggeration(sc.getVerticalExaggeration() + this.veStep);
} else if (controlType.equals(AVKey.VERTICAL_EXAGGERATION_DOWN)) {
SceneController sc = this.wwd.getSceneController();
sc.setVerticalExaggeration(Math.max(1d, sc.getVerticalExaggeration() - this.veStep));
}
view.firePropertyChange(AVKey.VIEW, null, view);
}
