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x32x01

ADMINISTRATOR
Staff Member
Move & scale graphical objects with a mouse on the panel

dBKRMhB.png

Java:
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() {
    addMouseMotionListener(ma);
    addMouseListener(ma);
    addMouseWheelListener(new ScaleHandler());
  }

  public void paint(Graphics g) {
    super.paint(g);

    Graphics2D g2d = (Graphics2D) g;

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

    g2d.setColor(new Color(0, 0, 200));
    g2d.fill(myRect);
  }

  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;
        repaint();
      }
      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;
          repaint();
        }
      }
    }
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("Moving and Scaling");
    MouseMoveScale m = new MouseMoveScale();
    m.setDoubleBuffered(true);
    frame.add(m);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300, 300);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}
 
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