Move Shape with mouse : Mouse « Event « Java

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Java » Event » MouseScreenshots 
Move Shape with mouse
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(550250));
    f.show();
  }
}

class MyCanvas extends Canvas implements MouseListener, MouseMotionListener {
  Rectangle rect = new Rectangle(0010050);

  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 = (Graphics2Dg;
    Dimension dim = getSize();
    int w = (intdim.getWidth();
    int h = (intdim.getHeight();
    g2.setStroke(new BasicStroke(8.0f));

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

    // Clears the rectangle that was previously drawn.
    g2.setPaint(Color.white);
    g2.fillRect(00, 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, 10050)) {
      return true;
    }
    int new_x = rect.x;
    int new_y = rect.y;

    if ((rect.x + 100> area.getWidth()) {
      new_x = (intarea.getWidth() 99;
    }
    if (rect.x < 0) {
      new_x = -1;
    }
    if ((rect.y + 50> area.getHeight()) {
      new_y = (intarea.getHeight() 49;
    }
    if (rect.y < 0) {
      new_y = -1;
    }
    rect.setLocation(new_x, new_y);
    return false;
  }
}
           
         
    
  
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3. Mouse drag and drawMouse drag and draw
4. MouseMotion Event: mouse move and dragMouseMotion Event: mouse move and drag
5. MouseDrag -- implement simple mouse drag in a windowMouseDrag -- implement simple mouse drag in a window
6. MouseDragClip -- implement simple mouse drag in a window. Speed up by using clipping regions
7. Swing Mouse Motion Event DemoSwing Mouse Motion Event Demo
8. Mouse Event DemoMouse Event Demo
9. Handle mouse motion event
10. Handle mouse button click event?
11. Move and scale graphical objects with a mouse on the panel
12. Detecting Double and Triple Clicks
13. InputEvent.BUTTON1_MASK (for left mouse button)
14. InputEvent.BUTTON2_MASK (for middle mouse button)
15. InputEvent.BUTTON3_MASK (for right mouse button)
16. Handling Mouse Clicks
17. Handling Mouse Motion
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