import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class SwingWithThread extends JComponent {
private Image[] frameList;
private long msPerFrame;
private volatile int currFrame;
private Thread internalThread;
private volatile boolean noStopRequested;
public SwingWithThread(int width, int height, long msPerCycle, int framesPerSec,
Color fgColor) {
setPreferredSize(new Dimension(width, height));
int framesPerCycle = (int) ((framesPerSec * msPerCycle) / 1000);
msPerFrame = 1000L / framesPerSec;
frameList = buildImages(width, height, fgColor, framesPerCycle);
currFrame = 0;
noStopRequested = true;
Runnable r = new Runnable() {
public void run() {
try {
runWork();
} catch (Exception x) {
// in case ANY exception slips through
x.printStackTrace();
}
}
};
internalThread = new Thread(r);
internalThread.start();
}
private Image[] buildImages(int width, int height, Color color, int count) {
BufferedImage[] im = new BufferedImage[count];
for (int i = 0; i < count; i++) {
im[i] = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
double xShape = 0.0;
double yShape = ((double) (i * height)) / (double) count;
double wShape = width;
double hShape = 2.0 * (height - yShape);
Rectangle2D shape = new Rectangle2D.Double(xShape, yShape, wShape,
hShape);
Graphics2D g2 = im[i].createGraphics();
g2.setColor(color);
g2.fill(shape);
g2.dispose();
}
return im;
}
private void runWork() {
while (noStopRequested) {
currFrame = (currFrame + 1) % frameList.length;
repaint();
try {
Thread.sleep(msPerFrame);
} catch (InterruptedException x) {
Thread.currentThread().interrupt();
}
}
}
public void stopRequest() {
noStopRequested = false;
internalThread.interrupt();
}
public boolean isAlive() {
return internalThread.isAlive();
}
public void paint(Graphics g) {
g.drawImage(frameList[currFrame], 0, 0, this);
}
public static void main(String[] args) {
SwingWithThread redSquish = new SwingWithThread(250, 200, 2500L, 10, Color.red);
JFrame f = new JFrame();
f.setLayout(new FlowLayout());
f.add(redSquish);
f.setSize(450, 250);
f.setVisible(true);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
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