net.java.balloontip.utils.FadingUtils Maven / Gradle / Ivy
/**
* Copyright (c) 2011 Bernhard Pauler, Tim Molderez.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the 3-Clause BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/BSD-3-Clause
*/
package net.java.balloontip.utils;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
import net.java.balloontip.BalloonTip;
/**
* A utility class for adding simple linear fade-in/out effects to balloon tips
* @author Tim Molderez
*/
public final class FadingUtils {
/*
* Disallow instantiating this class
*/
private FadingUtils() {}
/**
* Execute a fade-in effect on a balloon tip
* @param balloon the balloon tip
* @param onStop this action listener is triggered once the effect has stopped
* @param time the duration of the fade-in effect (in ms)
* @param refreshRate at how many frames-per-second should the effect run
*/
public static void fadeInBalloon(final BalloonTip balloon, final ActionListener onStop, final int time, final int refreshRate) {
balloon.setOpacity(0.0f);
balloon.setVisible(true);
final int timeDelta = 1000/refreshRate;
// Trigger this timer at the desired refresh rate and stop it once full opacity is reached.
final Timer timer = new Timer(timeDelta, new ActionListener () {
int curTime=0;
public void actionPerformed(ActionEvent e) {
curTime += timeDelta;
float newOpacity = ((float)curTime)/time; // f(time)=curTime/time
if (newOpacity >= 0.9999999f || Float.isNaN(newOpacity)) {
((Timer)e.getSource()).stop();
/* Because of some weird bug, possibly in AlphaComposite, the balloon tip is shifted 1px when the opacity is 1.0f
* We'll just use something as close to 1 as a workaround, for now.. */
balloon.setOpacity(0.9999999f);
onStop.actionPerformed(e);
} else {
balloon.setOpacity(newOpacity);
}
}
});
timer.setRepeats(true);
timer.start();
}
/**
* Execute a fade-in effect on a balloon tip
* @param balloon the balloon tip
* @param onStop this action listener is triggered once the effect has stopped
* @param time the duration of the fade-out effect (in ms)
* @param refreshRate at how many frames-per-second should the effect run
*/
public static void fadeOutBalloon(final BalloonTip balloon, final ActionListener onStop, final int time, final int refreshRate) {
balloon.setOpacity(0.9999999f);
balloon.setVisible(true);
final int timeDelta = 1000/refreshRate;
final Timer timer = new Timer(timeDelta, new ActionListener () {
int curTime=0;
public void actionPerformed(ActionEvent e) {
curTime += timeDelta;
float newOpacity = (-1.0f/time)*curTime+1.0f; // f(time)=(-1/time)*curTime+1
if (newOpacity <= 0.0f || Float.isNaN(newOpacity)) {
((Timer)e.getSource()).stop();
balloon.setOpacity(0.0f);
onStop.actionPerformed(e);
} else {
balloon.setOpacity(newOpacity);
}
}
});
timer.setRepeats(true);
timer.start();
}
}