Mouse drag and draw : Mouse « Event « Java

Mouse drag and draw

Mouse drag and draw
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

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

public class MouseDragActionPanel extends JPanel implements MouseMotionListener {
  private static final int SquareWidth = 10;

  private static final int Max = 100;

  private Rectangle[] squares = new Rectangle[Max];

  private int squareCount = 0;

  private int currentSquareIndex = -1;

  public MouseDragActionPanel() {
    addMouseListener(new MouseAdapter() {
      public void mousePressed(MouseEvent evt) {
        int x = evt.getX();
        int y = evt.getY();
        currentSquareIndex = getSquare(x, y);
        if (currentSquareIndex < 0) // not inside a square
          add(x, y);

      public void mouseClicked(MouseEvent evt) {
        int x = evt.getX();
        int y = evt.getY();

        if (evt.getClickCount() >= 2) {

  public void paintComponent(Graphics g) {
    for (int i = 0; i < squareCount; i++)

  public int getSquare(int x, int y) {
    for (int i = 0; i < squareCount; i++)
        return i;
    return -1;

  public void add(int x, int y) {
    if (squareCount < Max) {
      squares[squareCount] = new Rectangle(x, y,SquareWidth,SquareWidth);
      currentSquareIndex = squareCount;

  public void remove(int n) {
    if (n < 0 || n >= squareCount)
    squares[n] = squares[squareCount];
    if (currentSquareIndex == n)
      currentSquareIndex = -1;

  public void mouseMoved(MouseEvent evt) {
    int x = evt.getX();
    int y = evt.getY();

    if (getSquare(x, y) >= 0)

  public void mouseDragged(MouseEvent evt) {
    int x = evt.getX();
    int y = evt.getY();

    if (currentSquareIndex >= 0) {
      Graphics g = getGraphics();
      squares[currentSquareIndex].x = x;
      squares[currentSquareIndex].y = y;

  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setSize(300, 200);
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {

    Container contentPane = frame.getContentPane();
    contentPane.add(new MouseDragActionPanel());;

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