【JAVA】重力反弹，反弹高次一次比一次低

墨蓝 2024-02-05 17:15 26阅读 0赞

本来是想实现泡泡屏保([javascript实现漂亮的气泡碰撞效果(Chrome浏览器下更佳) 下载-脚本之家][javascript_Chrome_ _-])的，还未实现

**20231221晚上整理了下，看起来简洁些，也加了点注释：**

[JAVA小球碰撞\_哔哩哔哩\_bilibili][JAVA_bilibili]

import javax.swing.*;
    import java.awt.*;
    import java.util.LinkedList;
    
    class Bubble
    {
        public int x;
        public int y;
        public int vx;
        public int vy;
        public int radius;
    
        public Bubble(int x, int y, int vx, int vy, int radius) {
            this.x = x;
            this.y = y;
            this.vx = vx;
            this.vy = vy;
            this.radius = radius;
        }
    
        @Override
        public String toString() {
            return "Bubble{" + "x=" + x + ", y=" + y + ", vx=" + vx + ", vy=" + vy + ", radius=" + radius + '}';
        }
    }
    
    public class MainFrame extends JFrame implements Runnable {
        Graphics graphics;
        private final int windowWidth; //画板的宽度
        private final int windowHeight; //画板的高度
        private final LinkedList<Bubble> bubbleLinkedList;
    
        MainFrame()
        {
            windowWidth = 629;
            windowHeight = 990;
            setSize(windowWidth, windowHeight);
            setVisible(true);
            graphics = getContentPane().getGraphics();
            bubbleLinkedList = new LinkedList<>();
    
            //初始化小球
            for (int i = 0; i < 3; i++) {
                int x =(int) ((Math.random() - 0.5) * windowWidth);
                int y = (int) ((Math.random() - 0.5) * windowHeight);
                int vx = (int) ((Math.random() - 0.5) * 16);
                int vy = (int) ((Math.random() - 0.5) * 16);
                bubbleLinkedList.add(new Bubble(x, y, vx, vy, 40));
            }
        }
    
        @Override
        public void run() {
            while (true)
            {
                graphics.clearRect(0, 0, windowWidth, windowHeight);
                int color = 0;
                for (Bubble b: bubbleLinkedList) {
                    graphics.setColor(new Color(color,0,0));
                    graphics.fillArc(b.x,b.y, b.radius, b.radius,0,360);
                    move(b);
                    color += 255 / bubbleLinkedList.size();
                }
    
                for (Bubble bubble0: bubbleLinkedList)
                {
                    for (Bubble bubble1: bubbleLinkedList)
                    {
                        if (!bubble0.equals(bubble1)) {
                            BulletHit(bubble0, bubble1);
                        }
                    }
                }
    
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    
        public void move(Bubble bubble) //球移动，并且判断是否超出屏幕的上下左右
        {
            bubble.vy += 2;
            bubble.x += bubble.vx;
            bubble.y += bubble.vy;
            System.out.println(bubble);
            if (bubble.y > windowHeight - 2 * bubble.radius)
            {
                bubble.y = windowHeight - 2 * bubble.radius;
                bubble.vy *= -0.95;
            }
    
            if (bubble.y <  bubble.radius )
            {
                bubble.y = bubble.radius;
                bubble.vy *= -0.95;
            }
    
            if (bubble.x  > windowWidth - bubble.radius) {
                bubble.x = windowWidth - bubble.radius;
                bubble.vx *= -1;
            }
            if( bubble.x < 0 )
            {
                bubble.x = 0;
                bubble.vx *= -1;
            }
        }
    
        public void BulletHit(Bubble bubble0, Bubble bubble1) //如果两个球撞击
        {
            int dx = bubble1.x - bubble0.x;
            int dy = bubble1.y - bubble0.y;
            int DistanceCenter = (int) Math.sqrt(dx * dx + dy * dy);
            int DistanceRadius = (bubble0.radius + bubble1.radius) / 2;
            if (DistanceCenter < DistanceRadius)
            {
                double angle = Math.atan2(dy, dx);
                double ax = (bubble0.x - bubble1.x + Math.cos(angle) * DistanceRadius) * 0.9;
                double ay = (bubble0.y - bubble1.y + Math.sin(angle) * DistanceRadius) * 0.9;
    
                bubble0.vx -= ax;
                bubble1.vx += ax;
                bubble0.vy -= ay;
                bubble1.vy += ay;
            }
        }
    
        public static void main(String[] args) {
            new Thread(new MainFrame()).start();
        }
    }

import javax.swing.*;
    import java.awt.*;
    import java.util.LinkedList;
    import java.util.Random;
    
    class Bubble
    {
        public static Image image;
        public int x;
        public int y;
        public int vx;
        public int vy;
        public int displayWidth;
        public int displayHeight;
        public int gravity;
    
        public double bounce;
    
        public Bubble(String image, int x, int y, int vx, int vy, int displayWidth, int displayHeight) {
            this.image = Toolkit.getDefaultToolkit().getImage("src//" + image);
            this.x = x;
            this.y = y;
            this.vx = vx;
            this.vy = vy;
            this.displayWidth = displayWidth;
            this.displayHeight = displayHeight;
            gravity = 1;
    
            bounce = 0.9;
    
        }
    
        public void move()
        {
        }
    
        @Override
        public String toString() {
            return "Bubble{" +
                    "x=" + x +
                    ", y=" + y +
                    ", vx=" + vx +
                    ", vy=" + vy +
                    ", displayWidth=" + displayWidth +
                    ", displayHeight=" + displayHeight +
                    ", gravity=" + gravity +
                    ", bounce=" + bounce +
                    '}';
        }
    }
    
    public class MainFrame extends JFrame implements Runnable {
        Graphics graphics;
        Image image;
    
        int x;
        int y;
        private final int windowWidth;//画板的宽度
        private final int windowHeight;//画板的高度
        private LinkedList<Bubble> bubbleLinkedList;
    
        private double gravity= 2;  // 重力
    
        {
            setLayout(null);
            windowWidth = 629;
            windowHeight = 990;
            setSize(windowWidth, windowHeight);
            setLocationRelativeTo(null);
            setVisible(true);
            graphics = getContentPane().getGraphics();
        }
    
        MainFrame()
        {
            bubbleLinkedList = new LinkedList<>();
            for (int i = 0; i < 1; i++) {
    
                int x = new Random().nextInt(windowWidth / 10);
                int y = new Random().nextInt(windowHeight / 20);
                int vx = (int) (Math.random() * 16 - 8);
                int vy = (int) (Math.random() * 16 - 8);
                bubbleLinkedList.add(new Bubble("background.jpg", x, y, vx, vy, 20, 20));
            }
        }
    
        @Override
        public void run() {
            while (true)
            {
                for (Bubble b: bubbleLinkedList) {
                    graphics.drawImage(b.image, b.x, b.y, b.displayWidth, b.displayHeight, this);
                    BulletHit();
                    b.move();
                }
    
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    
        public void move(Bubble bubble)
        {
            //gravity += 2;
            bubble.vy += gravity;
            bubble.x += bubble.vx;
            bubble.y += bubble.vy;
            System.out.println(bubble.x + ": " + bubble.y + ": " + bubble.displayHeight + ": " + windowHeight);
            if (bubble.y + bubble.displayHeight > windowHeight)
            {
                bubble.y = windowHeight  - bubble.displayHeight;
                bubble.vy *= -0.95;
            }
    
            if (bubble.x + bubble.displayWidth > windowWidth) {
                bubble.x = windowWidth  - bubble.displayWidth;
                bubble.vx *= -1;
            }
            if( bubble.x <= bubble.displayWidth )
            {
                bubble.x = bubble.displayWidth;
                bubble.vx *= -1;
            }
        }
    
        public void BulletHit()
        {
            for (Bubble bubble0: bubbleLinkedList)
            {
                for (Bubble bubble1: bubbleLinkedList)
                {
                    if (!bubble0.equals(bubble1))
                    {
                        double x = Math.abs(bubble0.x - bubble1.x);
                        double x0 = bubble0.x - bubble1.x;
                        double y = Math.abs(bubble0.y - bubble1.y);
                        double y0 = bubble0.y - bubble1.y;
                        double dist = Math.sqrt(x * x + y * y);
                        if (dist <= bubble0.displayWidth)
                        {
                            double angle = Math.atan2(y0, x0);
                            double tx = bubble0.x + Math.cos(angle) * dist;
                            double ty = bubble0.y + Math.sin(angle) * dist;
                            double ax = (tx - bubble1.x) * 0.9;
                            double ay = (ty - bubble1.y) * 0.9;
    
                            bubble0.x -= ax;
                            bubble0.y -= ay;
                            bubble1.x -= ax;
                            bubble1.y -= ay;
                        }
                    }
                }
            }
    
            for (Bubble bubble0: bubbleLinkedList)
            {
                move(bubble0);
            }
        }
    
        public static void main(String[] args) {
            MainFrame mainFrame = new MainFrame();
            new Thread(mainFrame).start();
        }
    }

显示效果：

![e4eaaf9b98b94c1a90e3bb75bcca43e0.png][]

import javax.swing.*;
    import java.awt.*;
    import java.util.LinkedList;
    import java.util.Random;
    
    class Bubble
    {
        public static Image image;
        public int x;
        public int y;
        public int displayWidth;
        public int displayHeight;
        public int gravity;
    
        public double bounce;
    
        public Bubble(String image, int x, int y, int displayWidth, int displayHeight) {
            this.image = Toolkit.getDefaultToolkit().getImage("src//" + image);
            this.x = x;
            this.y = y;
            this.displayWidth = displayWidth;
            this.displayHeight = displayHeight;
            gravity = 1;
    
            bounce = 0.9;
    
        }
    
        public void move()
        {
        }
    
        @Override
        public String toString() {
            return "Bubble{" +
                    "x=" + x +
                    ", y=" + y +
                    ", displayWidth=" + displayWidth +
                    ", displayHeight=" + displayHeight +
                    '}';
        }
    }
    
    public class MainFrame extends JFrame implements Runnable {
        Graphics graphics;
        Image image;
    
        int x;
        int y;
        private final int windowWidth;//画板的宽度
        private final int windowHeight;//画板的高度
        private LinkedList<Bubble> bubbleLinkedList;
    
        private double ballsnum= 5;   // 小球数目
        private double spring= 0.8;   // 弹力加速度
        private double bounce= -0.95; // 反弹
        private double gravity= 0.1;  // 重力
    
        {
            setLayout(null);
            windowWidth = 629;
            windowHeight = 990;
            setSize(windowWidth, windowHeight);
            setLocationRelativeTo(null);
            setVisible(true);
            graphics = getContentPane().getGraphics();
        }
    
        MainFrame()
        {
            bubbleLinkedList = new LinkedList<>();
            for (int i = 0; i < 1; i++) {
    
                Integer x = new Random().nextInt(windowWidth / 10);
                Integer y = new Random().nextInt(windowHeight / 20);
                bubbleLinkedList.add(new Bubble("background.jpg", x, y, 20, 20));
            }
        }
    
        @Override
        public void run() {
            while (true)
            {
                for (Bubble b: bubbleLinkedList) {
                    graphics.drawImage(b.image, b.x, b.y, b.displayWidth, b.displayHeight, this);
                    BulletHit();
                    b.move();
                }
    
                y+=10;
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    
        public void move(Bubble bubble)
        {
            gravity += 2;
            bubble.x += 2;
            bubble.y += gravity;
            System.out.println(bubble.x + ": " + bubble.y + ": " + bubble.displayHeight + ": " + windowHeight);
            if (bubble.y + bubble.displayHeight > windowHeight)
            {
                bubble.y = windowHeight  - bubble.displayHeight;
                gravity *= -0.8;
            }
        }
    
        public void BulletHit()
        {
            for (Bubble bubble0: bubbleLinkedList)
            {
                for (Bubble bubble1: bubbleLinkedList)
                {
                    if (!bubble0.equals(bubble1))
                    {
                        double x = Math.abs(bubble0.x - bubble1.x);
                        double x0 = bubble0.x - bubble1.x;
                        double y = Math.abs(bubble0.y - bubble1.y);
                        double y0 = bubble0.y - bubble1.y;
                        double dist = Math.sqrt(x * x + y * y);
                        if (dist <= bubble0.displayWidth)
                        {
                            double angle = Math.atan2(y0, x0);
                            double tx = bubble0.x + Math.cos(angle) * dist;
                            double ty = bubble0.y + Math.sin(angle) * dist;
                            double ax = (tx - bubble1.x) * spring;
                            double ay = (ty - bubble1.y) * spring;
    
                            bubble0.x -= ax;
                            bubble0.y -= ay;
                            bubble1.x -= ax;
                            bubble1.y -= ay;
                        }
                    }
                }
            }
    
            for (Bubble bubble0: bubbleLinkedList)
            {
                move(bubble0);
            }
        }
    
        public static void main(String[] args) {
            MainFrame mainFrame = new MainFrame();
            new Thread(mainFrame).start();
        }
    }

![7eec821bf95b4d55b097c2cebe063539.png][]

[javascript_Chrome_ _-]: https://www.jb51.net/jiaoben/28295.html#downintro2
[JAVA_bilibili]: https://www.bilibili.com/video/BV1Ua4y1z7qq/?vd_source=0578c14da2b84f0964bbee439d4fd921
[e4eaaf9b98b94c1a90e3bb75bcca43e0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/00d04a015afb4dd4afb23bf615f4ff9c.png
[7eec821bf95b4d55b097c2cebe063539.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/89525adf158645a3b25e31672b848164.png