Perfect, that worked. It also updates the line when i move the box around, but
i think i can fix that.
The weird thing is, am having the exact same problem with images rotating,
where the previous images are left on the screen and i thought this fix would
fix it also, but it doesn't.
I can get this program to work if i make it a Frame instead of JPanel.
Here is the code.
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Panel;
import java.awt.Frame;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import javax.swing.JButton;
import java.awt.BorderLayout;
import java.awt.Rectangle;
//To import an image
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//Used for Timer
import javax.swing.Timer;
import java.awt.event.*;
import javax.swing.JPanel;
import java.awt.Point;
import java.applet.Applet;
public class panel_Compass extends JPanel implements Runnable{
private static final long serialVersionUID = 1L;
//Import the image of the compass
//Image compass = new ImageIcon("comp1.gif").getImage(); //
@jve:decl-index=0:
Image compass = new ImageIcon("compass.gif").getImage(); //
@jve:decl-index=0:
//Import the image of the arrow
Image arrow = new ImageIcon("arrow.gif").getImage(); //
@jve:decl-index=0:
//Import the image of the boat
Image boat = new ImageIcon("boat.gif").getImage(); //
@jve:decl-index=0:
//Timer timer;
Thread thread;
//Buffered Images
Image bufferImage; // @jve:decl-index=0:
//Buffred graphic
Graphics2D bufferGraphic; // @jve:decl-index=0:
//Store current Average Angle
double avgAngle = 0.0;
//Store current index to get average angle
int index = 1;
int index2 = 1;
private JButton startButton = null;
/**
* This is the default constructor
*/
public panel_Compass() {
super();
initialize();
//Create a thread to display the compass
thread = new Thread(this);
}
/**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setLayout(null);
this.setSize(400, 400);
this.setOpaque(false);
this.setDoubleBuffered(false);
//this.setTitle("Frame");
this.add(getStartButton(), null);
}
public double getAngle(){
//Randomly generate a number between 0 - 360;
double newAngle = Math.random()*360;
System.out.println("New Angle = " + Double.toString(newAngle));
//Return the random angle
return newAngle;
}
public double avgAngle() {
double angle = Math.random()*360;
this.avgAngle = this.avgAngle + angle;
double outputAngle = this.avgAngle/this.index;
index++;
System.out.println("Index =" + index + " avgAngle=" + avgAngle
+ " outputAngle =" + outputAngle);
return outputAngle;
}
public void paintComponent(Graphics g){
//Create a 2d graphics object
Graphics2D g2d = (Graphics2D)g;
//Reduced the area that is being updated to this rectangle
g2d.clipRect(0, 0, 400, 400);
//Create a buffer
if (bufferImage == null){
bufferImage = createImage(400,400);
}
//Create something in the buffer
bufferGraphic = (Graphics2D)bufferImage.getGraphics();
//Display a compass in the buffer
bufferGraphic.drawImage(compass, 0,0,400,400,this);
//Display a rotated arrow in the buffer
bufferGraphic.rotate(Math.toRadians(getAngle()),200 , 200);
bufferGraphic.drawImage(arrow,100,100,200,200,this);
//Display a rotated boat image in the buffer
bufferGraphic.rotate(Math.toRadians(getAngle()),200 , 200);
bufferGraphic.drawImage(boat, 100,100,200,200,this);
//Display the image from the buffer
g2d.drawImage(bufferImage, 0, 0,400,400, this);
//Clear the buffer for a new image
bufferGraphic.dispose();
//g2d.dispose();
//g.dispose();
}
/**
* This method initializes startButton
*
* @return javax.swing.JButton
*/
private JButton getStartButton() {
if (startButton == null) {
startButton = new JButton();
startButton.setBounds(new Rectangle(6, 32, 40, 21));
startButton.addActionListener(new
java.awt.event.ActionListener() {
public void
actionPerformed(java.awt.event.ActionEvent e) {
System.out.println("actionPerformed()"); // TODO Auto-generated Event stub
actionPerformed()
if(!thread.isAlive()){
thread.start();
}
}
});
}
return startButton;
}
//The thread will repaint using overloaded update() every 200ms
public void run() {
while(true){
try {
repaint();
Thread.sleep(200);
}
catch(Exception e) {
System.out.println("Stop");
thread.stop();
}
}
}
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