Move and scale graphical objects with a mouse on the panel : Mouse « Event « Java

Move and scale graphical objects with a mouse on the panel


import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.awt.geom.Rectangle2D;

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

public class MouseMoveScale extends JPanel {
  private Rectangle2D.Float myRect = new Rectangle2D.Float(50, 50, 50, 50);

  MovingAdapter ma = new MovingAdapter();

  public MouseMoveScale() {
    addMouseWheelListener(new ScaleHandler());

  public void paint(Graphics g) {

    Graphics2D g2d = (Graphics2D) g;

    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    g2d.setColor(new Color(0, 0, 200));

  class MovingAdapter extends MouseAdapter {

    private int x;

    private int y;

    public void mousePressed(MouseEvent e) {
      x = e.getX();
      y = e.getY();

    public void mouseDragged(MouseEvent e) {

      int dx = e.getX() - x;
      int dy = e.getY() - y;

      if (myRect.getBounds2D().contains(x, y)) {
        myRect.x += dx;
        myRect.y += dy;
      x += dx;
      y += dy;

  class ScaleHandler implements MouseWheelListener {
    public void mouseWheelMoved(MouseWheelEvent e) {

      int x = e.getX();
      int y = e.getY();

      if (e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL) {

        if (myRect.getBounds2D().contains(x, y)) {
          float amount = e.getWheelRotation() * 5f;
          myRect.width += amount;
          myRect.height += amount;

  public static void main(String[] args) {
    JFrame frame = new JFrame("Moving and Scaling");
    MouseMoveScale m = new MouseMoveScale();
    frame.setSize(300, 300);


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