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WebcamPanel.java
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WebcamPanel.java
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package com.sarxos.webcam;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.JPanel;
public class WebcamPanel extends JPanel implements WebcamListener {
private static final long serialVersionUID = 5792962512394656227L;
private int frequency = 65; // Hz
private class Repainter extends Thread {
public Repainter() {
setDaemon(true);
}
@Override
public void run() {
super.run();
while (webcam.isOpen()) {
image = webcam.getImage();
try {
if (paused) {
synchronized (this) {
this.wait();
}
}
Thread.sleep(1000 / frequency);
} catch (InterruptedException e) {
e.printStackTrace();
}
repaint();
}
}
}
private Webcam webcam = null;
private Image image = null;
private Repainter repainter = null;
public WebcamPanel(Webcam webcam) {
this.webcam = webcam;
this.webcam.addWebcamListener(this);
this.repainter = new Repainter();
if (webcam.isOpen()) {
setPreferredSize(webcam.getViewSize());
repainter.start();
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (image == null) {
return;
}
g.drawImage(image, 0, 0, null);
}
@Override
public void webcamOpen(WebcamEvent we) {
if (repainter == null) {
repainter = new Repainter();
}
repainter.start();
setPreferredSize(webcam.getViewSize());
}
@Override
public void webcamClosed(WebcamEvent we) {
try {
repainter.join();
repainter = null;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private volatile boolean paused = false;
/**
* Pause rendering.
*/
public void pause() {
if (paused) {
return;
}
paused = true;
System.out.println("paused");
}
/**
* Resume rendering.
*/
public void resume() {
if (!paused) {
return;
}
synchronized (repainter) {
repainter.notifyAll();
}
paused = false;
System.out.println("resumed");
}
/**
* @return Rendering frequency (in Hz or FPS).
*/
public int getFrequency() {
return frequency;
}
/**
* Set rendering frequency (in Hz or FPS). Min is 1 and max is 100.
*
* @param frequency
*/
public void setFrequency(int frequency) {
if (frequency > 100) {
frequency = 100;
}
if (frequency < 1) {
frequency = 1;
}
this.frequency = frequency;
}
}