Java OrbitView.getZoom方法代码示例

import gov.nasa.worldwind.view.orbit.OrbitView; //导入方法依赖的package包/类
@Override
protected MapPlace createPlace(MapPlace root, String text, double x,
		double y, double zoom) {
	WorldWindowGLCanvas wwd = ((WWMap) map).wwd;
	OrbitView view = (OrbitView) wwd.getView();

	zoom = ((WWMap) map).getGMAZoom();
	Position pos = view.getCenterPosition();
	double pitch = view.getPitch().degrees;
	double heading = view.getHeading().degrees;
	double zoom2 = view.getZoom();
	double ve = wwd.getSceneController().getVerticalExaggeration();

	return new WWMapPlace( 
			root,
			text, 
			pos.getLongitude().degrees,
			pos.getLatitude().degrees,
			zoom,
			pitch,
			heading,
			zoom2,
			ve);
}
 

import gov.nasa.worldwind.view.orbit.OrbitView; //导入方法依赖的package包/类
/**
 * 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);
}
 

import gov.nasa.worldwind.view.orbit.OrbitView; //导入方法依赖的package包/类
protected double computeNewZoom(OrbitView view, double amount)
{
    double coeff = 0.05;
    double change = coeff * amount;
    double logZoom = view.getZoom() != 0 ? Math.log(view.getZoom()) : 0;
    // Zoom changes are treated as logarithmic values. This accomplishes two things:
    // 1) Zooming is slow near the globe, and fast at great distances.
    // 2) Zooming in then immediately zooming out returns the viewer to the same zoom value.
    return Math.exp(logZoom + change);
}
 

import gov.nasa.worldwind.view.orbit.OrbitView; //导入方法依赖的package包/类
/**
 * 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);
    }
}
 

import gov.nasa.worldwind.view.orbit.OrbitView; //导入方法依赖的package包/类
public void zoomToWESN(double[] wesn) {
	double delta_x = wesn[1] - wesn[0];
	double delta_y = wesn[3] - wesn[2];

	double earthRadius = wwd.getModel().getGlobe().getRadius();

	double horizDistance = earthRadius * delta_x;
	double vertDistance = earthRadius * delta_y;

	// Form a triangle consisting of the longest distance on the ground and the ray from the eye to the center point 
	// The ray from the eye to the midpoint on the ground bisects the FOV
	double distance = Math.max(horizDistance, vertDistance) / 64;
	double altitude = distance / Math.tan(wwd.getView().getFieldOfView().radians / 2);

	LatLon latlon = LatLon.fromDegrees(wesn[2] + delta_y / 2, wesn[0] + delta_x / 2);
	Position pos = new Position(latlon, altitude);
	final OrbitView view = (OrbitView) wwd.getView();
	Position oldPos = view.getEyePosition();
	view.setEyePosition(pos);

	Position center = view.getCenterPosition();
	Angle heading = view.getHeading();
	Angle pitch = view.getPitch();
	double zoom = view.getZoom();
	view.setEyePosition(oldPos);

	FlyToOrbitViewAnimator fto = 
		FlyToOrbitViewAnimator.createFlyToOrbitViewAnimator(
			view,
			view.getCenterPosition(), center,
			view.getHeading(), heading,
			view.getPitch(), pitch,
			view.getZoom(), zoom,
			5000, WorldWind.CONSTANT); //was true

	view.addAnimator(fto);

	SwingUtilities.invokeLater(new Runnable() {
		public void run() {
			((MapApp)getApp()).getFrame().toFront();
			view.firePropertyChange(AVKey.VIEW,  null, view);
		}
	});
}