java - 有没有办法在 Java 中为整个 Jframe 制作动画，使其移动？

Question

我想创建一个程序，其中 Jframe 能够自行自由移动。有点像翻译/过渡。

例如，

1. 点击程序开始。

2. Jframe 在位置 (0,0) 处生成。

3. 自动向右移动(动画)100 像素，使新坐标为 (100,0)。

我知道有 setLocation(x,y) 方法可以在程序运行后设置初始位置，但是有没有办法在程序启动后移动整个 Jframe？

Answer 1

基本概念看起来像这样......

public class MoveMe01 {

    public static void main(String[] args) {
        new MoveMe01();
    }

    public MoveMe01() {

        EventQueue.invokeLater(
                new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                final JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JLabel("Use the Force Luke"));
                frame.pack();
                frame.setLocation(0, 0);
                frame.setVisible(true);

                Timer timer = new Timer(40, new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        Point location = frame.getLocation();
                        Point to = new Point(location);
                        if (to.x < 100) {
                            to.x += 4;
                            if (to.x > 100) {
                                to.x = 100;
                            }
                        }
                        if (to.y < 100) {
                            to.y += 4;
                            if (to.y > 100) {
                                to.y = 100;
                            }
                        }

                        frame.setLocation(to);

                        if (to.equals(location)) {
                            ((Timer)e.getSource()).stop();
                        }
                    }
                });
                timer.setRepeats(true);
                timer.setCoalesce(true);
                timer.start();

            }
        });
    }
}

这是一个非常直接的线性动画。您最好研究可用于 Swing 的众多动画引擎之一，这将使您能够根据当前帧更改动画的速度(例如执行慢入和慢出等操作)

我想看看

• Timing Framework
• Trident
• Universla Tween Engine

更新为“可变时间”解决方案

这基本上是如何制作可变时间动画的示例。也就是说，不是有一个固定的运动，你可以调整时间并让动画根据动画的运行时间来计算运动要求...

public class MoveMe01 {

    public static void main(String[] args) {
        new MoveMe01();
    }

    // How long the animation should run for in milliseconds
    private int runTime = 500;
    // The start time of the animation...
    private long startTime = -1;

    public MoveMe01() {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                final JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JLabel("Use the Force Luke"));
                frame.pack();
                frame.setLocation(0, 0);
                frame.setVisible(true);

                Timer timer = new Timer(40, new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {

                        if (startTime < 0) {
                            // Start time of the animation...
                            startTime = System.currentTimeMillis();
                        }
                        // The current time
                        long now = System.currentTimeMillis();
                        // The difference in time
                        long dif = now - startTime;
                        // If we've moved beyond the run time, stop the animation
                        if (dif > runTime) {
                            dif = runTime;
                            ((Timer)e.getSource()).stop();
                        }
                        // The percentage of time we've been playing...
                        double progress = (double)dif / (double)runTime;

                        Point location = frame.getLocation();
                        Point to = new Point(location);

                        // Calculate the position as perctange over time...
                        to.x = (int)Math.round(100 * progress);
                        to.y = (int)Math.round(100 * progress);
                        // nb - if the start position wasn't 0x0, then you would need to
                        // add these to the x/y position above...

                        System.out.println(to);

                        frame.setLocation(to);
                    }
                });
                timer.setRepeats(true);
                timer.setCoalesce(true);
                timer.start();

            }
        });
    }
}