Java中的简单物理仿真无法正常工作.

我试着尽我所能,
但是我无法在代码中应用所有物理现象,有人可以告诉我,我错了或者我还在做一些愚蠢的编程错误.

当我没有调用反弹方法并且我无法利用弹跳方法并且球向左侧移动而不是在地板上下降/结束时,球正在移动**,

有些身体可以推荐我一些更好的方法或类似的简单方法来完成这个任务,在两个球或更多的球交互性上应用物理.

这是代码;

import java.awt.*;
    public class AdobeBall {

    protected int radius = 20;
    protected Color color;

    // ... Constants
    final static int DIAMETER = 40;

    // ... Instance variables
    private int m_x; // x and y coordinates upper left
    private int m_y;

    private double dx = 3.0; // delta x and y 
    private double dy = 6.0;

    private double m_velocityX; // Pixels to move each time move() is called.
    private double m_velocityY;

    private int m_rightBound; // Maximum permissible x,y values.
    private int m_bottomBound;

    public AdobeBall(int x,int y,double velocityX,double velocityY,Color color1) {
        super();
        m_x = x;
        m_y = y;
        m_velocityX = velocityX;
        m_velocityY = velocityY;
        color = color1;
    }

    public double getSpeed() {
        return Math.sqrt((m_x + m_velocityX - m_x) * (m_x + m_velocityX - m_x)
                + (m_y + m_velocityY - m_y) * (m_y + m_velocityY - m_y));
    }

    public void setSpeed(double speed) {
        double currentSpeed = Math.sqrt(dx * dx + dy * dy);
        dx = dx * speed / currentSpeed;
        dy = dy * speed / currentSpeed;
    }

    public void setDirection(double direction) {
        m_velocityX = (int) (Math.cos(direction) * getSpeed());
        m_velocityY = (int) (Math.sin(direction) * getSpeed());
    }

    public double getDirection() {
        double h = ((m_x + dx - m_x) * (m_x + dx - m_x))
                + ((m_y + dy - m_y) * (m_y + dy - m_y));
        double a = (m_x + dx - m_x) / h;
        return a;
    }

    // ======================================================== setBounds
    public void setBounds(int width,int height)  {
        m_rightBound = width - DIAMETER;
        m_bottomBound = height - DIAMETER;
    }

    // ============================================================== move
    public void move()  {

        double gravAmount = 0.02;
        double gravDir = 90; // The direction for the gravity to be in.
        // ... Move the ball at the give velocity.
        m_x += m_velocityX;
        m_y += m_velocityY;

//       ... Bounce the ball off the walls if necessary.
        if (m_x < 0) { // If at or beyond left side
            m_x = 0; // Place against edge and
            m_velocityX = -m_velocityX;

        } else if (m_x > m_rightBound) { // If at or beyond right side
            m_x = m_rightBound; // Place against right edge.
            m_velocityX = -m_velocityX;
        }

        if (m_y < 0) { // if we're at top
            m_y = 0;
            m_velocityY = -m_velocityY;

        } else if (m_y > m_bottomBound) { // if we're at bottom
            m_y = m_bottomBound;
            m_velocityY = -m_velocityY;
        }

     //   double speed = Math.sqrt((m_velocityX * m_velocityX)
     //         + (m_velocityY * m_velocityY));

        // ...Friction stuff 
        double fricMax = 0.02; // You can use any number,preferably less than 1
        double friction = getSpeed();
        if (friction > fricMax)
            friction = fricMax;
        if (m_velocityX >= 0) {
            m_velocityX -= friction;
        }
        if (m_velocityX <= 0) {
            m_velocityX += friction;
        }
        if (m_velocityY >= 0) {
            m_velocityY -= friction;
        }
        if (m_velocityY <= 0) {
            m_velocityY += friction;
        }

        // ...Gravity stuff

        m_velocityX += Math.cos(gravDir) * gravAmount;
        m_velocityY += Math.sin(gravDir) * gravAmount;

    }

    public Color getColor() {
        return color;
    }

    public void setColor(Color newColor)  {
        color = newColor;
    }

    // ============================================= getDiameter,getX,getY
    public int getDiameter() {
        return DIAMETER;
    }

  public double getRadius() {
        return radius; // radius should be a local variable in Ball.
    }

    public int getX() {
        return m_x;
    }

    public int getY() {
        return m_y;
    }

}

使用adobeBall：

import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;

    public class AdobeBallImplementation implements Runnable {

    private static final long serialVersionUID = 1L;

    private volatile boolean Play;
    private long mFrameDelay;
    private JFrame frame;
    private MyKeyListener pit;

    /** true means mouse was pressed in ball and still in panel. */
    private boolean _canDrag = false;

    private static final int MAX_BALLS = 50; // max number allowed
    private int currentNumBalls = 2; // number currently active
    private AdobeBall[] ball = new AdobeBall[MAX_BALLS];

    public AdobeBallImplementation(Color ballColor) {

        frame = new JFrame("simple gaming loop in java");
        frame.setSize(400,400);
        frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        pit = new MyKeyListener();
        pit.setPreferredSize(new Dimension(400,400));
        frame.setContentPane(pit);

        ball[0] = new AdobeBall(34,150,7,2,Color.YELLOW);
        ball[1] = new AdobeBall(50,50,5,3,Color.BLUE);
        frame.pack();
        frame.setVisible(true);
        frame.setBackground(Color.white);
        start();
        frame.addMouseListener(pit);
        frame.addMouseMotionListener(pit);

    }

    public void start() {
        Play = true;
        Thread t = new Thread(this);
        t.start();
    }

    public void stop() {
        Play = false;
    }

    public void run() {

        while (Play == true) {
            // bounce(ball[0],ball[1]);
            runball();
            pit.repaint();
            try {
                Thread.sleep(mFrameDelay);
            } catch (InterruptedException ie) {
                stop();
            }
        }
    }

    public void drawworld(Graphics g) {

        for (int i = 0; i < currentNumBalls; i++) {
            g.setColor(ball[i].getColor());
            g.fillOval(ball[i].getX(),ball[i].getY(),40,40);
        }
    }

    public double pointDistance (double x1,double y1,double x2,double y2) {
        return Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
    }

    public void runball() {

        while (Play == true) {
            try {

                for (int i = 0; i < currentNumBalls; i++) {
                    for (int j = 0; j < currentNumBalls; j++) {

                        if (pointDistance(ball[i].getX(),ball[j].getX(),ball[j].getY()) < ball[i]
                                                                       .getRadius()
                                                                       + ball[j].getRadius() + 2) {
                            // bounce(ball[i],ball[j]);
                            ball[i].setBounds(pit.getWidth(),pit.getHeight());
                            ball[i].move();

                            pit.repaint();

                        }
                    }
                }

                try {
                    Thread.sleep(50);
                } catch (Exception e) {
                    System.exit(0);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public static double pointDirection(int x1,int y1,int x2,int y2) {
        double H = Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)); // The
        // hypotenuse
        double x = x2 - x1; // The opposite
        double y = y2 - y1; // The adjacent
        double angle = Math.acos(x / H);
        angle = angle * 57.2960285258;
        if (y < 0) {
            angle = 360 - angle;
        }
        return angle;
    }

    public static void bounce(AdobeBall b1,AdobeBall b2) {
        if (b2.getSpeed() == 0 && b1.getSpeed() == 0) {
            // Both balls are stopped.
            b1.setDirection(pointDirection(b1.getX(),b1.getY(),b2.getX(),b2
                    .getY()));
            b2.setDirection(pointDirection(b2.getX(),b2.getY(),b1.getX(),b1
                    .getY()));
            b1.setSpeed(1);
            b2.setSpeed(1);
        } else if (b2.getSpeed() == 0 && b1.getSpeed() != 0) {
            // B1 is moving. B2 is stationary.
            double angle = pointDirection(b1.getX(),b2
                    .getY());
            b2.setSpeed(b1.getSpeed());
            b2.setDirection(angle);
            b1.setDirection(angle - 90);
        } else if (b1.getSpeed() == 0 && b2.getSpeed() != 0) {
            // B1 is moving. B2 is stationary.
            double angle = pointDirection(b2.getX(),b1
                    .getY());
            b1.setSpeed(b2.getSpeed());
            b1.setDirection(angle);
            b2.setDirection(angle - 90);
        } else {
            // Both balls are moving.
            AdobeBall tmp = b1;
            double angle = pointDirection(b2.getX(),b1
                    .getY());
            double origangle = b1.getDirection();
            b1.setDirection(angle + origangle);
            angle = pointDirection(tmp.getX(),tmp.getY(),b2.getY());
            origangle = b2.getDirection();
            b2.setDirection(angle + origangle);
        }
    }

    public static void main(String[] args) {

        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new AdobeBallImplementation(Color.red);
            }
        });
    }

}

*编辑：*确定从这个论坛使用新的重力方法拆分代码：这个代码也不起作用球不在场：

public void mymove() {

    m_x += m_velocityX;
    m_y += m_velocityY;

    if (m_y + m_bottomBound > 400) {
        m_velocityY *= -0.981;
    //  setY(400 - m_bottomBound);
        m_y = 400 - m_bottomBound;

    }

    // ... Bounce the ball off the walls if necessary.
    if (m_x < 0) { // If at or beyond left side
        m_x = 0; // Place against edge and
        m_velocityX = -m_velocityX;

    } else if (m_x > m_rightBound) { // If at or beyond right side
        m_x = m_rightBound - 20; // Place against right edge.
        m_velocityX = -m_velocityX;
    }

    if (m_y < 0) { // if we're at top
        m_y = 1;
        m_velocityY = -m_velocityY;

    } else if (m_y > m_bottomBound) { // if we're at bottom
        m_y = m_bottomBound - 20;
        m_velocityY = -m_velocityY;

    }
}

非常感谢任何纠正和帮助.

jibby