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|
package demoanimation
;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.KeyboardFocusManager;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.plaf.basic.BasicArrowButton;
public class DemoAnimationContinue extends JPanel {
private static final int SPEED = 5;
private final Image image;
private volatile Point location;
private volatile Point direction;
private final Timer timer = new Timer();
private final TimerTask timertask;
public DemoAnimationContinue(Image image) {
this.image=image;
this.location = new Point(0,0);
this.direction = new Point(0,0);
this.timertask = new TimerTask() {
@Override
public void run() {
moveImage();
}
};
}
public void startTimer() {
timer.scheduleAtFixedRate(timertask, 33, 33);
}
public void stopTimer() {
timertask.cancel();
}
public void resetLocation() {
System.out.println(image.getWidth(this));
int x=(getWidth()-image.getWidth(this))/2;
int y=(getHeight()-image.getHeight(this))/2;
direction = new Point(0,0);
location = new Point(x,y);
}
public void moveUp(int length) {
direction = new Point(direction.x,-length);
}
public void moveDown(int length) {
direction = new Point(direction.x,length);
}
public void moveRight(int length) {
direction = new Point(length,direction.y);
}
public void moveLeft(int length) {
direction = new Point(-length,direction.y);
}
private void moveImage() {
Point newLocation = new Point(location.x + direction.x, location.y + direction.y);
if ( newLocation.x+image.getWidth(this)>getWidth() ) {
newLocation.x = getWidth()-image.getWidth(this);
direction=new Point(-direction.x,direction.y);
}
if ( newLocation.x<0 ) {
newLocation.x = 0;
direction=new Point(-direction.x,direction.y);
}
if ( newLocation.y+image.getHeight(this)>getHeight() ) {
newLocation.y = getHeight()-image.getHeight(this);
direction=new Point(direction.x,-direction.y);
}
if ( newLocation.y<0 ) {
newLocation.y = 0;
direction=new Point(direction.x,-direction.x);
}
location = newLocation;
repaint();
}
@Override
public void paint(Graphics g) {
super.paint(g);
drawImage(g, location);
}
private void drawImage(Graphics g, Point location) {
g.drawImage(image, location.x, location.y, this);
}
public static void main(String[] args) {
run(new ImageIcon("ballon.gif").getImage());
}
public static void run(Image image) {
DemoAnimationContinue demoPanel = new DemoAnimationContinue(image);
JButton up = new BasicArrowButton(BasicArrowButton.NORTH);
up.addActionListener(e-> demoPanel.moveUp(SPEED));
JButton down = new BasicArrowButton(BasicArrowButton.SOUTH);
down.addActionListener(e-> demoPanel.moveDown(SPEED));
JButton right = new BasicArrowButton(BasicArrowButton.EAST);
right.addActionListener(e-> demoPanel.moveRight(SPEED));
JButton left = new BasicArrowButton(BasicArrowButton.WEST);
left.addActionListener(e-> demoPanel.moveLeft(SPEED));
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(e-> {
switch(e.getKeyCode()) {
case KeyEvent.VK_RIGHT:
demoPanel.moveRight(SPEED);
return false;
case KeyEvent.VK_LEFT:
demoPanel.moveLeft(SPEED);
return false;
case KeyEvent.VK_UP:
demoPanel.moveUp(SPEED);
return false;
case KeyEvent.VK_DOWN:
demoPanel.moveDown(SPEED);
return false;
}
return true;
});
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(demoPanel);
frame.add(up, BorderLayout.NORTH);
frame.add(left, BorderLayout.WEST);
frame.add(right, BorderLayout.EAST);
frame.add(down, BorderLayout.SOUTH);
frame.setSize(600, 400);
frame.setLocationRelativeTo(null);
frame.addWindowListener(new WindowAdapter() {
public void windowClosed(java.awt.event.WindowEvent e) {
demoPanel.stopTimer();
}
});
frame.setVisible(true);
demoPanel.resetLocation();
demoPanel.startTimer();
}
} |
