问题
Perhaps there are some of you using NASA's worldwind in WWJ form. I just started and set up everything in NetBeans, so that the latest WWJ runs there with jogl and co. I tested it with basic demo code.
My aim is to display a graph on the WWJ canvas, that will be updated regularly and will be animated in this way. It will be a 2D graph of a dataset, that will be computed in the background and the WWJ programm has to read and display it.
Do you have some tips and EASY examples/tutorials for how I can do that?
Hi, I was able to insert a jfreechart chart, but I haven't been able to "update" the chart yet, could you help me?
package screensaver;
import gov.nasa.worldwind.BasicModel;
import gov.nasa.worldwind.avlist.AVKey;
import gov.nasa.worldwind.awt.WorldWindowGLCanvas;
import gov.nasa.worldwind.geom.Angle;
import gov.nasa.worldwind.geom.Position;
import gov.nasa.worldwind.layers.RenderableLayer;
import gov.nasa.worldwind.render.Offset;
import gov.nasa.worldwind.render.ScreenImage;
import gov.nasa.worldwind.render.Size;
import gov.nasa.worldwind.view.firstperson.BasicFlyView;
import gov.nasa.worldwind.view.firstperson.FlyToFlyViewAnimator;
import java.awt.Frame;
import java.awt.event.KeyEvent;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import javax.imageio.ImageIO;
///
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;
import java.awt.image.BufferedImage;
public class FullScreenTest{
public static double test = 0;
/**
* The animated view
*/
public static BasicFlyView view;
/**
* The ScreenSaver entry point, should run in windowed mode
* with interactivity or fullscreen mode depending on flags
* http://boinc.berkeley.edu/trac/wiki/ScreensaverEnhancements
* @param args
*/
public static void main(String[] args) {
view = new BasicFlyView();
Frame frame = new Frame("WorldwindFull");
final WorldWindowGLCanvas worldWindowGLCanvas = new WorldWindowGLCanvas();
worldWindowGLCanvas.setModel(new BasicModel());
worldWindowGLCanvas.setView(view);
worldWindowGLCanvas.addKeyListener(new java.awt.event.KeyListener() {
public void keyTyped(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
System.exit(0);
}
}
});
RenderableLayer creditsLayer = new RenderableLayer();
creditsLayer.setName("Credits");
try {
creditsLayer.addRenderables(createCredits());
} catch (IOException ioEx) {
ioEx.printStackTrace();
}
worldWindowGLCanvas.getModel().getLayers().add(creditsLayer);
////
RenderableLayer chartsLayer = new RenderableLayer();
chartsLayer.setName("Charts");
try {
chartsLayer.addRenderables(createCharts());
} catch (IOException ioEx) {
ioEx.printStackTrace();
}
worldWindowGLCanvas.getModel().getLayers().add(chartsLayer);
frame.add(worldWindowGLCanvas);
frame.setSize(640, 480);
frame.setUndecorated(true);
int size = frame.getExtendedState();
size |= Frame.MAXIMIZED_BOTH;
frame.setExtendedState(size);
frame.setVisible(true);
worldWindowGLCanvas.requestFocus();
setUpTimer();
}
/**
* Static method to produce credits for all involved
* organisations
* @return
* @throws IOException
*/
public static List<ScreenImage> createCredits() throws IOException
{
List<ScreenImage> allCredits = new ArrayList<ScreenImage>();
ScreenImage creditWWC = new ScreenImage();
creditWWC.setImageSource(ImageIO.read(
new File("src/images/worldwindcentral.gif")));
//TODO: More flexible out of code layout policy
creditWWC.setScreenOffset(new Offset(0.10, 0.90, AVKey.FRACTION, AVKey.FRACTION));
creditWWC.setSize(new Size(Size.MAINTAIN_ASPECT_RATIO, 0.05,
AVKey.FRACTION,Size.MAINTAIN_ASPECT_RATIO, 0.05,
AVKey.FRACTION));
ScreenImage creditRKN = new ScreenImage();
creditRKN.setImageSource(ImageIO.read(
new File("src/images/logo_selfnet1.png")));
//TODO: More flexible out of code layout policy
creditRKN.setScreenOffset(new Offset(0.50, 0.90, AVKey.FRACTION, AVKey.FRACTION));
creditRKN.setSize(new Size(Size.MAINTAIN_ASPECT_RATIO, 0.05,
AVKey.FRACTION,Size.MAINTAIN_ASPECT_RATIO, 0.05,
AVKey.FRACTION));
allCredits.add(creditWWC);
allCredits.add(creditRKN);
return allCredits;
}
public static List<ScreenImage> createCharts() throws IOException
{
// create a dataset...
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("Category 1", 43.2-test);
dataset.setValue("Category 2", 27.9+test);
dataset.setValue("Category 3", 79.5);
// create a chart...
JFreeChart chart = ChartFactory.createPieChart(
"Sample Pie Chart",
dataset,
true, // legend?
true, // tooltips?
false // URLs?
);
//chart.createBufferedImage(100, 100);
// create and display a frame...
//ChartFrame frame1 = new ChartFrame("First", chart);
//frame1.pack();
//frame1.setVisible(true);
//frame1.createImage(100, 100);
final BufferedImage image = chart.createBufferedImage(400, 300);
List<ScreenImage> allCharts = new ArrayList<ScreenImage>();
ScreenImage chart1 = new ScreenImage();
chart1.setImageSource(image);
//TODO: More flexible out of code layout policy
chart1.setScreenOffset(new Offset(0.17, 0.60, AVKey.FRACTION, AVKey.FRACTION));
chart1.setSize(new Size(Size.MAINTAIN_ASPECT_RATIO, 0.05,
AVKey.FRACTION,Size.MAINTAIN_ASPECT_RATIO, 0.05,
AVKey.FRACTION));
allCharts.add(chart1);
return allCharts;
}
/**
* The globe auto-rotate animator
* @param pos
*/
public static void moveToLocation(Position pos) {
if (pos == null) {
return;
}
double elevation = view.getGlobe().getElevation(pos.getLatitude(),
pos.getLongitude());
FlyToFlyViewAnimator animator = FlyToFlyViewAnimator.
createFlyToFlyViewAnimator(view, view.getEyePosition(),
new Position(pos.latitude, pos.longitude, elevation),
view.getHeading(), view.getHeading(), view.getPitch(),
view.getPitch(), view.getEyePosition().getElevation(),
view.getEyePosition().getElevation(), 10000, 0);
view.addAnimator(animator);
animator.start();
view.firePropertyChange(AVKey.VIEW, null, view);
}
/**
* Convenience timer set-up to periodically rotate the globe
*/
public static void setUpTimer()
{
int delay = 5000; // delay for 5 sec.
int period = 10000; // repeat every sec.
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
public void run() {
Position pos = new Position(Angle.fromDegrees(
180*new Random().nextFloat()-90.0),
Angle.fromDegrees(
360*new Random().nextFloat()-180.0),
0.0);
moveToLocation(pos);
Random rn = new Random();
int n = 10 - 0 + 1;
int i = rn.nextInt() % n;
FullScreenTest.test = 0 + i;
System.out.println(FullScreenTest.test);
}
}, delay, period);
}
}
回答1:
So you added a renderable layer called creditsLayer which displays an image. A simple (maybe a bit crude) way to update the image is to dispose the layer (creditsLayer.dispose()) and re-add it with another image and after worldWindowGLCanvas.redraw(). As the screensaver won't update too often this might be acceptable. Or you can have different layers for each image you have and enable/disable them as you need and redraw the canvas. HTH
来源：https://stackoverflow.com/questions/5859286/2d-graph-animation-on-worldwindjava-canvas