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  1. import java.awt.*;
  2. import java.awt.event.*;
  3. import java.util.*;
  4. import javax.swing.*;
  5. import static java.lang.Math.*;
  6.  
  7. class Log {
  8.     int shape = -1;
  9.     int startX = -1, startY = -1, endX = -1, endY = -1, rad = -1, width = -1, height = -1;
  10.     public Log(int shape, int startX, int startY, int endX, int endY, int rad, int width, int height) {
  11.         this.shape = shape;
  12.         this.startX = startX;
  13.         this.startY = startY;
  14.         this.endX = endX;
  15.         this.endY = endY;
  16.         this.rad = rad;
  17.         this.width = width;
  18.         this.height = height;
  19.     }
  20. }
  21.  
  22. class MyPanel extends JPanel implements ActionListener {
  23.     int shape = -3;
  24.     int startX, startY, endX, endY, rad, width, height;
  25.     JButton btnUndo, btnRedo;
  26.     ArrayList<Log> logs;
  27.     int now = 0;
  28.  
  29.     public MyPanel() {
  30.         JPanel p = new JPanel();
  31.         this.btnUndo = new JButton("Undo");
  32.         this.btnUndo.setEnabled(false);
  33.         this.btnUndo.addActionListener(this);
  34.         this.btnRedo = new JButton("Redo");
  35.         this.btnRedo.setEnabled(false);
  36.         this.btnRedo.addActionListener(this);
  37.         p.add(btnUndo);
  38.         p.add(btnRedo);
  39.         this.add(p);
  40.         this.logs = new ArrayList<Log>();
  41.     }
  42.  
  43.     @Override public void actionPerformed(ActionEvent e) {
  44.         JButton source = (JButton)e.getSource();
  45.         if(source == btnUndo) {
  46.             shape = -2;
  47.             repaint();
  48.         } else if(source == btnRedo) {
  49.             shape = -1;
  50.             repaint();
  51.         }
  52.     }
  53.  
  54.     @Override public void paint(Graphics g) {
  55.         super.paint(g);
  56.         if(shape == -2) {
  57.             now -= 1;
  58.         } else if(shape == -1) {
  59.             now += 1;
  60.         }
  61.         for(int i=0; i<now; i++) {
  62.             Log log = logs.get(i);
  63.             if(log.shape == 0) {
  64.                 g.fillArc(log.startX, log.startY, log.rad, log.rad, 0, 360);
  65.             } else if(log.shape == 1) {
  66.                 g.fillRect(log.startX, log.startY, log.width, log.height);
  67.             } else if(log.shape == 2) {
  68.                 g.drawLine(log.startX, log.startY, log.endX, log.endY);
  69.             }
  70.         }
  71.         if(shape == 0) {
  72.             g.fillArc(startX, startY, rad, rad, 0, 360);
  73.             if(now + 1 == logs.size() - 1) {
  74.                 logs.add(new Log(0, startX, startY, -1, -1, rad, -1, -1));
  75.             } else {
  76.                 for(int i=now; i<logs.size(); ) {
  77.                     logs.remove(i);
  78.                 }
  79.                 logs.add(new Log(0, startX, startY, -1, -1, rad, -1, -1));
  80.             }
  81.             now = logs.size();
  82.         } else if(shape == 1) {
  83.             g.fillRect(startX, startY, width, height);
  84.             if(now + 1 == logs.size() - 1) {
  85.                 logs.add(new Log(1, startX, startY, -1, -1, -1, width, height));
  86.             } else {
  87.                 for(int i=now; i<logs.size(); ) {
  88.                     logs.remove(i);
  89.                 }
  90.                 logs.add(new Log(1, startX, startY, -1, -1, -1, width, height));
  91.             }
  92.             now = logs.size();
  93.         } else if(shape == 2) {
  94.             g.drawLine(startX, startY, endX, endY);
  95.             if(now + 1 == logs.size() - 1) {
  96.                 logs.add(new Log(2, startX, startY, endX, endY, -1, -1, -1));
  97.             } else {
  98.                 for(int i=now; i<logs.size(); ) {
  99.                     logs.remove(i);
  100.                 }
  101.                 logs.add(new Log(2, startX, startY, endX, endY, -1, -1, -1));
  102.             }
  103.             now = logs.size();
  104.         }
  105.         if(now > 0) { this.btnUndo.setEnabled(true); }
  106.         else { this.btnUndo.setEnabled(false); }
  107.         if(now == logs.size()) { this.btnRedo.setEnabled(false); }
  108.         else { this.btnRedo.setEnabled(true); }
  109.     }
  110. }
  111.  
  112. class MyFrame extends JFrame implements MouseListener {
  113.     JPanel pnlNorth;
  114.     MyPanel pnlCenter;
  115.     JRadioButton radCircle, radRectangle, radLine;
  116.     int startX, startY, endX, endY;
  117.     public MyFrame() {
  118.         this.setLayout(new BorderLayout());
  119.         this.setSize(800, 600);
  120.         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  121.         this.pnlCenter = new MyPanel();
  122.         this.pnlCenter.addMouseListener(this);
  123.         ButtonGroup group = new ButtonGroup();
  124.         this.radCircle = new JRadioButton("Circle");
  125.         this.radCircle.setSelected(true);
  126.         this.radRectangle = new JRadioButton("Rectangle");
  127.         this.radLine = new JRadioButton("Line");
  128.         group.add(radCircle);
  129.         group.add(radRectangle);
  130.         group.add(radLine);
  131.         pnlNorth = new JPanel();
  132.         pnlNorth.add(radCircle);
  133.         pnlNorth.add(radRectangle);
  134.         pnlNorth.add(radLine);
  135.         this.add(pnlNorth, BorderLayout.NORTH);
  136.         this.add(pnlCenter, BorderLayout.CENTER);
  137.     }
  138.  
  139.     @Override public void mouseClicked(MouseEvent e) {}
  140.     @Override public void mouseExited(MouseEvent e) {}
  141.     @Override public void mouseEntered(MouseEvent e) {}
  142.     @Override public void mousePressed(MouseEvent e) {
  143.         startX = e.getX();
  144.         startY = e.getY();
  145.     }
  146.     @Override public void mouseReleased(MouseEvent e) {
  147.         endX = e.getX();
  148.         endY = e.getY();
  149.         if(radCircle.isSelected()) {
  150.             pnlCenter.shape = 0;
  151.             if(endY < startY || startX < startY) { return; }
  152.             pnlCenter.startX = startX;
  153.             pnlCenter.startY = startY;
  154.             pnlCenter.rad = endX - startX;
  155.         } else if(radRectangle.isSelected()) {
  156.             pnlCenter.shape = 1;
  157.             if(endY < startY || startX < startY) { return; }
  158.             pnlCenter.startX = startX;
  159.             pnlCenter.startY = startY;
  160.             pnlCenter.width = endX - startX;
  161.             pnlCenter.height = endY - startY;
  162.         } else if(radLine.isSelected()) {
  163.             pnlCenter.shape = 2;
  164.             pnlCenter.startX = startX;
  165.             pnlCenter.startY = startY;
  166.             pnlCenter.endX = endX;
  167.             pnlCenter.endY = endY;
  168.         }
  169.         repaint();
  170.     }
  171. }
  172.  
  173. public class Main {
  174.     public static void main(String[] args) {
  175.         new MyFrame().setVisible(true);
  176.     }
  177. }
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https://ideone.com/yuSCd
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
secret

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