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  1. import java.awt.*;
  2. import java.awt.event.*;
  3. import javax.swing.*;
  4. import static java.lang.Math.*;
  5.  
  6. class MyPanel extends JPanel {
  7.     int w, h, h1, hh;
  8.     int x0, y0, a, b;
  9.  
  10.     public MyPanel() {
  11.         this.w = 500;
  12.         this.h = 250;
  13.         this.h1 = 25;
  14.         this.hh = 50;
  15.         setPreferredSize(new Dimension(w, h));
  16.     }
  17.  
  18.     private void _throw(Graphics g) {
  19.         double y = y0;
  20.         for(int tt=0; y>0; tt++) {
  21.             double t = tt / 50.d;
  22.             double x = x0 + t * a;
  23.             y = y0 + t * b - t * t * 9.8 / 2;
  24.             g.fillOval(w/2+(int)x, h-hh-(int)y, 2, 2);
  25.         }
  26.     }
  27.  
  28.     @Override public void paint(Graphics g) {
  29.         super.paint(g);
  30.         g.drawLine(0, h-hh, w, h-hh);
  31.         g.drawLine(w/2, h1, w/2, h-hh);
  32.         _throw(g);
  33.     }
  34. }
  35.  
  36. class MyFrame extends JFrame implements ActionListener {
  37.     JTextField txtX0, txtY0, txtA, txtB;
  38.     JButton btnThrow;
  39.     MyPanel p;
  40.  
  41.     public MyFrame() {
  42.         this.setSize(600, 300);
  43.         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  44.         this.setResizable(false);
  45.         JLabel l1 = new JLabel("初期位置");
  46.         JLabel l2 = new JLabel("X0");
  47.         this.txtX0 = new JTextField(3);
  48.         JLabel l3 = new JLabel("Y0");
  49.         this.txtY0 = new JTextField(3);
  50.         JLabel l4 = new JLabel("初速度");
  51.         JLabel l5 = new JLabel("A");
  52.         this.txtA = new JTextField(3);
  53.         JLabel l6 = new JLabel("B");
  54.         this.txtB = new JTextField(3);
  55.         this.btnThrow = new JButton("投げる");
  56.         this.txtX0.setText("150");
  57.         this.txtY0.setText("100");
  58.         this.txtA.setText("-20");
  59.         this.txtB.setText("10");
  60.         this.p = new MyPanel();
  61.         JPanel p1 = new JPanel();
  62.         p1.add(l1);
  63.         p1.add(l2);
  64.         p1.add(txtX0);
  65.         p1.add(l3);
  66.         p1.add(txtY0);
  67.         p1.add(l4);
  68.         p1.add(l5);
  69.         p1.add(txtA);
  70.         p1.add(l6);
  71.         p1.add(txtB);
  72.         p1.add(btnThrow);
  73.         p1.add(p);
  74.         getContentPane().add(p1);
  75.         this.btnThrow.addActionListener(this);
  76.     }
  77.  
  78.     @Override public void actionPerformed(ActionEvent e) {
  79.         p.x0 = Integer.parseInt(txtX0.getText());
  80.         p.y0 = Integer.parseInt(txtY0.getText());
  81.         p.a  = Integer.parseInt(txtA.getText());
  82.         p.b  = Integer.parseInt(txtB.getText());
  83.         p.repaint();
  84.     }
  85. }
  86.  
  87. public class P72_019 {
  88.     public static void main(String[] args) {
  89.         new MyFrame().setVisible(true);
  90.     }
  91. }
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https://ideone.com/9oU2s
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
secret

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