I am trying to rotate a JLabel 90 degrees that shows the current time 90 degrees. After doing some research, most people have recommended using Graphics2D and AffineTransform. This almost works, but when the minute in the time is updated, the new digit appears to merge with the old digit.
This does not happen for the seconds. Does anybody have any idea how to fix this issue or have an alternate solution?
Driver class:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.DisplayMode;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
@SuppressWarnings("serial")
public class Driver extends JFrame implements KeyListener {
private boolean running = true;
ClockWidget clockWidget;
static Dimension screenSize;
public static void main(String[] args) {
screenSize = Toolkit.getDefaultToolkit().getScreenSize();
DisplayMode displayMode = new DisplayMode((int) screenSize.getWidth(), (int) screenSize.getHeight(), 32,
DisplayMode.REFRESH_RATE_UNKNOWN);
new Driver().run(displayMode);
}
public void run(DisplayMode displayMode) {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
getContentPane().setBackground(Color.BLACK);
setFont(new Font("Arial", Font.PLAIN, 24));
Screen screen = new Screen();
screen.setFullScreen(displayMode, this);
initClockWidgit();
addKeyListener(this);
System.out.println("RUNNING");
while (running) {
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
quitProgram(screen);
return;
}
public void initClockWidgit() {
clockWidget = new ClockWidget();
clockWidget.setFont(new Font("Arial", Font.PLAIN, 36));
clockWidget.setForeground(Color.WHITE);
clockWidget.setBackground(Color.BLUE);
clockWidget.setBounds((int) (screenSize.getWidth() * 0.90), (int) (screenSize.getHeight() * 0.10), 250, 100);
add(clockWidget);
new Thread(clockWidget).start();
}
public void quitProgram(Screen screen) {
screen.restoreScreen();
clockWidget.disable();
}
@Override
public void keyPressed(KeyEvent keyEvent) {
int keyCode = keyEvent.getKeyCode();
if (keyCode == KeyEvent.VK_SPACE) {
running = false;
}
keyEvent.consume();
}
@Override
public void keyReleased(KeyEvent keyEvent) {
keyEvent.consume();
}
@Override
public void keyTyped(KeyEvent keyEvent) {
keyEvent.consume();
}
}
ClockWidget Class:
import java.text.SimpleDateFormat;
import java.util.Calendar;
import javax.swing.JLabel;
public class ClockWidget extends RotatedJLabel implements Runnable{
private String currentTime;
private boolean running;
public ClockWidget() {
running = true;
}
@Override
public void run() {
while(running) {
Calendar calendar = Calendar.getInstance();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm:ss a");
currentTime = simpleDateFormat.format(calendar.getTime());
setText(currentTime);
}
}
public void disable() {
running = false;
}
}
RotatedJLabel Class:
[import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import javax.swing.Icon;
import javax.swing.JLabel;
public class RotatedJLabel extends JLabel {
public RotatedJLabel() {
super();
}
public RotatedJLabel(Icon image) {
super(image);
}
public RotatedJLabel(Icon image, int horizontalAlignment) {
super(image, horizontalAlignment);
}
public RotatedJLabel(String text) {
super(text);
}
public RotatedJLabel(String text, Icon icon, int horizontalAlignment) {
super(text, icon, horizontalAlignment);
}
public RotatedJLabel(String text, int horizontalAlignment) {
super(text, horizontalAlignment);
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
AffineTransform aT = g2.getTransform();
Shape oldshape = g2.getClip();
double x = getWidth()/2.0;
double y = getHeight()/2.0;
aT.rotate(Math.toRadians(90), x, y);
g2.setTransform(aT);
g2.setClip(oldshape);
super.paintComponent(g);
}
}
A few things jump out at me:
JLabel
for this purpose, it's a complicate component, starting with aJPanel
and simply painting the text would be simpler. In my testing it was very hard to get the sizing hints to work correctly when the graphics context was rotated.KeyListener
Thread
, you should be using a SwingTimer
, and since you probably really only want to update the seconds, running it at a much slower speed. See Concurrency in Swing and How to Use Swing Timers for more detailsCalendar
andDate
are effectively deprecated. See Standard Calendar for more detailsFor example...
Now, if you "absolutely, must, no questions asked" use a component like
Label
, then I recommend usingJLayer
instead.Unfourtantly, I've not had time to update my examples to use
JLayer
, but they use the predecessor library,JXLayer