抛体运动问题，45度斜抛和垂直上抛

来源：互联网发布：买卖闲置软件编辑：程序博客网时间：2024/04/30 19:26

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class XYThrowMain {

   static class XYThrow extends JPanel {
       double x1, y1; // 垂直上抛坐标
       double x21, y21, x22, y22; // 斜抛坐标
       double v01 = 6000;
       boolean stop = false; //停止标志
       int t = 0;
       double v02 = 100; //斜抛出去的初速度
       double g = 9.8; //重力加速度
       double xscale = 300; //为了方便作图而做的缩小变换
       double yscale = 20000;

       private void setAffine(Graphics2D g) {
           AffineTransform a1 = new AffineTransform(1, 0, 0, -1, 50, 100);
           g.setTransform(a1);
       }

       @Override
       public void paint(Graphics g1) {
           super.paint(g1);
           //System.out.println(x21 + " " + y21 + " " + x22 + " " + y22);
           Graphics2D g = (Graphics2D) g1;
           setAffine(g);
           g.setPaint(Color.white);
           coordinate(g);
           paintV(g);
           paintTow(g);

       }

       private void coordinate(Graphics2D g) {
           g.drawLine(0, -900, 0, 100); // y
           g.drawLine(-100, 0, 900, 0);// x
           Paint tmp = g.getPaint();
           g.setPaint(Color.red);
           g.drawString("0", -10, -5); //坐标原点
           g.drawString("x", 700, 10);
           g.setPaint(Color.black); //画一条基准线，方便观察
           g.drawLine(20, -900, 20, 100);
           g.setPaint(tmp);

       }

       public void start() throws InterruptedException {
           new Thread(new VerticalThrow()).start();
           new Thread(new ParabolaThrow()).start();
           for (int i = 0; i < 250; i++) {
               t += 10; //模拟时间进度
               Thread.sleep(100);
               repaint();
           }

       }

       private List<Line2D> towList = new ArrayList<Line2D>();

       private void paintTow(Graphics2D g) {
           g.setPaint(Color.red);
           towList.add(new Line2D.Double(x21 / xscale, y21 / yscale, x22
                   / xscale, y22 / yscale));
           for (Line2D l : towList) {
               g.draw(l);
           }
       }

       private void paintV(Graphics2D g) {
           Paint tmp = g.getPaint();
           g.setPaint(Color.red);
           g.fill(new Ellipse2D.Double(x1,y1/yscale,3,3));
           g.setPaint(tmp);
       }

       @Override
       public void update(Graphics g) {
           paint(g);
       }

       class VerticalThrow implements Runnable {
           @Override
           public void run() {
               while (!stop) {
                   x1 = 20;
                   y1 = v01 * t - 0.5 * g * Math.pow(t, 2);
                   try {
                       Thread.sleep(100);
                   } catch (InterruptedException e) {
                       // TODO Auto-generated catch block
                       e.printStackTrace();
                   }
               }
           }

       }

       class ParabolaThrow implements Runnable {
           @Override
           public void run() {
               while (!stop) {
                   x21 = x22;
                   y21 = y22;
                   x22 = v02 * t *Math.cos(45);
                   y22 = v02 * t * Math.sin(45) - 0.5 * g * Math.pow(t, 2);
                   try {
                       Thread.sleep(200);
                   } catch (InterruptedException e) {
                       // TODO Auto-generated catch block
                       e.printStackTrace();
                   }

               }

           }

       }

   }

   /**
   * @param args
   * @throws InterruptedException
   */
   public static void main(String[] args) throws InterruptedException {
       final JFrame jframe = new JFrame();
       jframe.addWindowListener(new WindowAdapter(){
           @Override
           public void windowClosed(WindowEvent e) {
               jframe.dispose();
           }

       });
       XYThrow jpanel = new XYThrow();
       jframe.add(jpanel);
       jframe.setBounds(50, 50, 900, 800);
       jframe.setVisible(true);
       jpanel.start();

   }

}