Source Code : Move Shape with mouse

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Move Shape with mouse

   
import java.applet.Applet;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Label;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JApplet;
//Use double buffering to remove rectangle flickers and make it repaint faster.
public class ShapeMover extends JApplet {
  static protected Label label = new Label(
      "Drag rectangle around within the area");

  public void init() {

    getContentPane().setLayout(new BorderLayout());
    getContentPane().add(new MyCanvas());

    getContentPane().add("South", label);
  }

  public static void main(String s[]) {
    Frame f = new Frame("ShapeMover");
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    Applet applet = new ShapeMover();
    f.add("Center", applet);
    applet.init();
    f.pack();
    f.setSize(new Dimension(550, 250));
    f.show();
  }
}

class MyCanvas extends Canvas implements MouseListener, MouseMotionListener {
  Rectangle rect = new Rectangle(0, 0, 100, 50);

  Graphics2D g2;

  int preX, preY;

  boolean isFirstTime = true;

  Rectangle area;

  boolean pressOut = false;

  public MyCanvas() {
    setBackground(Color.white);
    addMouseMotionListener(this);
    addMouseListener(this);
  }

  public void mousePressed(MouseEvent e) {
    preX = rect.x - e.getX();
    preY = rect.y - e.getY();

    if (rect.contains(e.getX(), e.getY()))
      updateLocation(e);
    else {
      ShapeMover.label.setText("Drag it.");
      pressOut = true;
    }
  }

  public void mouseDragged(MouseEvent e) {
    if (!pressOut)
      updateLocation(e);
    else
      ShapeMover.label.setText("Drag it.");
  }

  public void mouseReleased(MouseEvent e) {
    if (rect.contains(e.getX(), e.getY()))
      updateLocation(e);
    else {
      ShapeMover.label.setText("Drag it.");
      pressOut = false;
    }
  }

  public void mouseMoved(MouseEvent e) {
  }

  public void mouseClicked(MouseEvent e) {
  }

  public void mouseExited(MouseEvent e) {
  }

  public void mouseEntered(MouseEvent e) {
  }

  public void updateLocation(MouseEvent e) {
    rect.setLocation(preX + e.getX(), preY + e.getY());

    if (checkRect()) {
      ShapeMover.label.setText(rect.getX() + ", " + rect.getY());
    } else {
      ShapeMover.label.setText("drag inside the area.");
    }

    repaint();
  }

  public void paint(Graphics g) {
    update(g);
  }

  public void update(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    Dimension dim = getSize();
    int w = (int) dim.getWidth();
    int h = (int) dim.getHeight();
    g2.setStroke(new BasicStroke(8.0f));

    if (isFirstTime) {
      area = new Rectangle(dim);
      rect.setLocation(w / 2 - 50, h / 2 - 25);
      isFirstTime = false;
    }

    // Clears the rectangle that was previously drawn.
    g2.setPaint(Color.white);
    g2.fillRect(0, 0, w, h);

    g2.setColor(Color.red);
    g2.draw(rect);
    g2.setColor(Color.black);
    g2.fill(rect);
  }

  boolean checkRect() {
    if (area == null) {
      return false;
    }

    if (area.contains(rect.x, rect.y, 100, 50)) {
      return true;
    }
    int new_x = rect.x;
    int new_y = rect.y;

    if ((rect.x + 100) > area.getWidth()) {
      new_x = (int) area.getWidth() - 99;
    }
    if (rect.x < 0) {
      new_x = -1;
    }
    if ((rect.y + 50) > area.getHeight()) {
      new_y = (int) area.getHeight() - 49;
    }
    if (rect.y < 0) {
      new_y = -1;
    }
    rect.setLocation(new_x, new_y);
    return false;
  }
}
           
         
    
    
  

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