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  1. import java.applet.Applet;
  2. import java.awt.Graphics;
  3. import java.awt.Color;
  4. import java.awt.Image;
  5. import java.awt.Dimension;
  6.  
  7. /* <applet code="houbutsu.class" width="800" height="500"></applet> */
  8.  
  9. public class houbutsu extends Applet implements Runnable {
  10.   final static double grav = 9.81;        // 重力加速度
  11.   final static double x_start = 20.0;     // スタート位置 x
  12.   final static double y_start = 220.0;     // スタート位置 y
  13.   final static double vx_start = 50.0;    // 初速 x
  14.   final static double vy_start = 30.0;    // 初速 y
  15.   final static double delta = 0.12;        // 時間間隔(調整可能）
  16.   final static int hosei = 30;
  17.   final static int speed = 100;            // 画面表示のスピード（調整可能）
  18.  
  19.   double x, y, prev1_x, prev1_y, prev2_x, prev2_y, stop_y;
  20.   double t;
  21.   double dim_y;
  22.  
  23.   Thread th;
  24.   Image buff;
  25.   Graphics ct;
  26.   Dimension dim;
  27.  
  28.   public void init() {
  29.     t = 0.0;
  30.  
  31.     th = new Thread(this);
  32.     th.start();
  33.     dim = getSize();
  34.     buff = createImage(dim.width, dim.height);
  35.     dim_y = (double)dim.height;
  36.   }    
  37.  
  38.   public void run() {
  39.     try {
  40.       while (true) {
  41.  
  42. /* 描画関係 */
  43.         prev2_x = prev1_x;
  44.         prev2_y = prev1_y;
  45.         prev1_x = x;
  46.         prev1_y = y;
  47.  
  48. /* 以下、運動の記述 */
  49.         x = x_start + t * vx_start;
  50.         y = dim_y - (stop_y = y_start + t * vy_start - 0.5 * grav * t * t) - hosei;
  51.         t += delta;
  52.  
  53. /* 停止条件 */
  54.         if (stop_y < 0)
  55.           break;
  56.  
  57.         repaint();
  58.         Thread.sleep(speed);
  59.       }
  60.     } catch (InterruptedException e) { };
  61.   }
  62.  
  63.  
  64.   public void update(Graphics g) {
  65.     paint(g);
  66.   }
  67.  
  68.   public void paint(Graphics g) {
  69.     if (ct == null) ct = buff.getGraphics();
  70.     ct.setColor(Color.white);
  71.     ct.fillRect((int)prev2_x, (int)prev2_y, 20, 20);
  72.     ct.fillRect((int)prev1_x, (int)prev1_y, 20, 20);
  73. //    ct.fillRect(0, 0, dim.width, dim.height);
  74.     ct.setColor(Color.red);
  75.     ct.fillOval((int)x, (int)y, 20, 20);
  76.     g.drawImage(buff, 0, 0, this);
  77.   }
  78. }
  79. /* end */
  80.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:9: class houbutsu is public, should be declared in a file named houbutsu.java
public class houbutsu extends Applet implements Runnable {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/Gccjw
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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