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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.awt.*;
  4. import java.awt.event.*;
  5. import java.awt.geom.*;
  6. import javax.swing.*;
  7.  
  8. public class Yp_16 {
  9.  
  10.     public static void main(String[] args) {
  11.         JFrame fr = new JFrame("Вращение треугольника вокруг своего центра тяжести");
  12.         fr.setPreferredSize(new Dimension(300, 300));
  13.         final JPanel pan = new JPanel();
  14.         fr.add(pan);
  15.         fr.setVisible(true);
  16.         fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  17.         fr.pack();
  18.         Timer tm = new Timer(500, new ActionListener() {
  19.             int i = 0;
  20.  
  21.             @Override
  22.             public void actionPerformed(ActionEvent arg0) {
  23.                 Graphics2D gr = (Graphics2D) pan.getRootPane().getGraphics();
  24.                 pan.update(gr);
  25.                 GeneralPath path = new GeneralPath();
  26.                 path.append(new Polygon(new int[]{60, -80, 50}, new int[]{-60, -50, 40}, 3), true);
  27.                 int x = (60 - 80 + 50) / 3, y = (-60 - 50 + 40) / 3;
  28.                 gr.translate(150, 150);
  29.                 AffineTransform tranforms = AffineTransform.getRotateInstance((i++) * 0.07, x, y);
  30.                 gr.transform(tranforms);
  31.                 gr.draw(path);
  32.             }
  33.         });
  34.         tm.start();
  35.     }
  36. }
  37.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:8: error: class Yp_16 is public, should be declared in a file named Yp_16.java
public class Yp_16 {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/Ml47ID
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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