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[英]Parrot AR.Drone 2.0 - JavaDrone (Get the drone details E.G. Battery Level, Altitude, Speed etc)?
[英]Javadrone - Unable to get image from Parrot AR.Drone 2.0
我正在開發一個使用Javadrone API
和庫控制Parrot Ar.Drone 2.0
的應用程序。
我能夠連接到無人機並成功起飛/降落。 有2個Java文件: DroneTestVideo.java
, VideoPanel.java
。
DroneTestVideo.java
文件負責連接到無人機並獲取數據,而VideoPanel.java
文件用作設置圖像。
Javadrone API
可以在這里下載。
但是,我不知道為什么我無法從無人機獲取實時圖像。 它只是顯示一個黑屏,上面寫着:
“沒有視頻連接”
這是我的代碼:
DroneTestVideo.java
package dronetest;
import com.codeminders.ardrone.ARDrone;
import com.codeminders.ardrone.ARDrone.VideoChannel;
import com.codeminders.ardrone.DroneStatusChangeListener;
import com.codeminders.ardrone.NavData;
import com.codeminders.ardrone.NavDataListener;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
public class DroneTestVideo extends javax.swing.JFrame implements DroneStatusChangeListener, NavDataListener{
private static final long CONNECT_TIMEOUT = 10000L;
private ARDrone drone;
private final VideoPanel video = new VideoPanel();
public DroneTestVideo() {
initComponents();
initDrone();
videoPanel.add(video);
takeoff();
}
private void initDrone() {
try{
drone = new ARDrone();
drone.addStatusChangeListener(this);
drone.addStatusChangeListener(new DroneStatusChangeListener() {
public void ready() {
org.apache.log4j.Logger.getLogger(getClass().getName()).debug("updateLoop::ready()");
}
});
System.err.println("Configure");
drone.selectVideoChannel(ARDrone.VideoChannel.HORIZONTAL_ONLY);
drone.setCombinedYawMode(true);
drone.enableAutomaticVideoBitrate();
System.err.println("Connecting to the drone");
drone.connect();
drone.waitForReady(CONNECT_TIMEOUT);
drone.clearEmergencySignal();
System.err.println("Connected to the drone");
} catch (IOException ex) {
Logger.getLogger(DroneTestVideo.class.getName()).log(Level.SEVERE, null,ex);
}
drone.addNavDataListener(this);
video.setDrone(drone);
}
private void takeoff()
{
try {
System.err.println("**********\nTRIM\n**********");
drone.trim();
Thread.sleep(2000);
System.err.println("**********\nTAKEOFF\n**********");
drone.takeOff();
Thread.sleep(7000);
drone.land();
} catch (IOException ex) {
Logger.getLogger(DroneTestVideo.class.getName()).log(Level.SEVERE, null, ex);
} catch (InterruptedException ex) {
Logger.getLogger(DroneTestVideo.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new DroneTestVideo().setVisible(true);
}
});
}
}
VideoPanel.java
package dronetest;
import com.codeminders.ardrone.ARDrone;
import com.codeminders.ardrone.DroneVideoListener;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
public class VideoPanel extends javax.swing.JPanel implements DroneVideoListener{
private AtomicReference<BufferedImage> image = new AtomicReference<BufferedImage>();
private AtomicBoolean preserveAspect = new AtomicBoolean(true);
private BufferedImage noConnection = new BufferedImage(320, 240, BufferedImage.TYPE_INT_RGB);
public VideoPanel() {
initComponents();
Graphics2D g2d = (Graphics2D) noConnection.getGraphics();
Font f = g2d.getFont().deriveFont(24.0f);
g2d.setFont(f);
g2d.drawString("No video connection", 40, 110);
image.set(noConnection);
}
public void setDrone(ARDrone drone) {
drone.addImageListener(this);
System.err.println("setDrone function here!");
}
public void setPreserveAspect(boolean preserve) {
preserveAspect.set(preserve);
}
public void frameReceived(BufferedImage im) {
image.set(im);
repaint();
}
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int width = getWidth();
int height = getHeight();
drawDroneImage(g2d, width, height);
}
private void drawDroneImage(Graphics2D g2d, int width, int height) {
BufferedImage im = image.get();
if (im == null) {
return;
}
int xPos = 0;
int yPos = 0;
if (preserveAspect.get()) {
g2d.setColor(Color.BLACK);
g2d.fill3DRect(0, 0, width, height, false);
float widthUnit = ((float) width / 4.0f);
float heightAspect = (float) height / widthUnit;
float heightUnit = ((float) height / 3.0f);
float widthAspect = (float) width / heightUnit;
if (widthAspect > 4) {
xPos = (int) (width - (heightUnit * 4)) / 2;
width = (int) (heightUnit * 4);
} else if (heightAspect > 3) {
yPos = (int) (height - (widthUnit * 3)) / 2;
height = (int) (widthUnit * 3);
}
}
if (im != null) {
g2d.drawImage(im, xPos, yPos, width, height, null);
}
}
}
您不會更新屏幕,因此不會將對drawDroneImage的新調用調用到VideoPanel中。
您應該設置一個循環以刷新JPanel(將其稱為repaint())。
而且,您還需要實施DoubleBuffering策略來獲得更平滑的圖像事務。
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