Could someone teach me how to use a swing timer
with the following purpose:
I need to have a polygon that begins being animated(simple animation such as rotating) when I click the mouse; and stops animating when I click again.
I do not have problems understanding the way the MouseListener
works, but with the actual animation. I tried simulating the animation with a while block inside the paint()
method where I would draw, erase and redraw the polygon(to simulate a rotation for example), but inside the while, the applet would not listen to the clicks. It would listen only after the while. I would need the swing timer to break the while when I click the mouse.
import javax.swing.Timer;
Add an attribute;
Timer timer;
boolean b; // for starting and stoping animation
Add the following code to frame's constructor.
timer = new Timer(100, new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
// change polygon data
// ...
repaint();
}
});
Override paint(Graphics g)
and draw polygon from the data that was modified by actionPerformed(e)
.
Finally, a button that start/stop animation has the following code in its event handler.
if (b) {
timer.start();
} else {
timer.stop();
}
b = !b;
This example controls a javax.swing.Timer
using a button, while this related example responds to a mouse click. The latter example reverses direction on each click, but start/stop is a straightforward alteration.
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