Drags within the image : Mouse « Event « Java

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Java » Event » Mouse 




Drags within the image
Drags within the image
   
/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

/*
 * SelectionDemo.java is a 1.4 application that requires one other file:
 * images/starfield.gif
 */

import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.event.MouseInputAdapter;
import java.awt.*;
import java.awt.event.MouseEvent;

/*
 * This displays an image. When the user drags within the image, this program
 * displays a rectangle and a string indicating the bounds of the rectangle.
 */
public class SelectionDemo {
  JLabel label;

  static String starFile = "starfield.gif";

  private void buildUI(Container container, ImageIcon image) {
    container.setLayout(new BoxLayout(container, BoxLayout.PAGE_AXIS));

    SelectionArea area = new SelectionArea(image, this);
    container.add(area);

    label = new JLabel("Drag within the image.");
    label.setLabelFor(area);
    container.add(label);

    //Align the left edges of the components.
    area.setAlignmentX(Component.LEFT_ALIGNMENT);
    label.setAlignmentX(Component.LEFT_ALIGNMENT)//redundant
  }

  public void updateLabel(Rectangle rect) {
    int width = rect.width;
    int height = rect.height;

    //Make the coordinates look OK if a dimension is 0.
    if (width == 0) {
      width = 1;
    }
    if (height == 0) {
      height = 1;
    }

    label.setText("Rectangle goes from (" + rect.x + ", " + rect.y
        ") to (" (rect.x + width - 1", "
        (rect.y + height - 1").");
  }

  /** Returns an ImageIcon, or null if the path was invalid. */
  protected static ImageIcon createImageIcon(String path) {
    java.net.URL imgURL = SelectionDemo.class.getResource(path);
    if (imgURL != null) {
      return new ImageIcon(imgURL);
    else {
      System.err.println("Couldn't find file: " + path);
      return null;
    }
  }

  /**
   * Create the GUI and show it. For thread safety, this method should be
   * invoked from the event-dispatching thread.
   */
  private static void createAndShowGUI() {
    //Make sure we have nice window decorations.
    JFrame.setDefaultLookAndFeelDecorated(true);

    //Create and set up the window.
    JFrame frame = new JFrame("SelectionDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Set up the content pane.
    SelectionDemo controller = new SelectionDemo();
    controller.buildUI(frame.getContentPane(), createImageIcon(starFile));

    //Display the window.
    frame.pack();
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    //Schedule a job for the event-dispatching thread:
    //creating and showing this application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    });
  }

  private class SelectionArea extends JLabel {
    Rectangle currentRect = null;

    Rectangle rectToDraw = null;

    Rectangle previousRectDrawn = new Rectangle();

    SelectionDemo controller;

    public SelectionArea(ImageIcon image, SelectionDemo controller) {
      super(image)//This component displays an image.
      this.controller = controller;
      setOpaque(true);
      setMinimumSize(new Dimension(1010))//don't hog space

      MyListener myListener = new MyListener();
      addMouseListener(myListener);
      addMouseMotionListener(myListener);
    }

    private class MyListener extends MouseInputAdapter {
      public void mousePressed(MouseEvent e) {
        int x = e.getX();
        int y = e.getY();
        currentRect = new Rectangle(x, y, 00);
        updateDrawableRect(getWidth(), getHeight());
        repaint();
      }

      public void mouseDragged(MouseEvent e) {
        updateSize(e);
      }

      public void mouseReleased(MouseEvent e) {
        updateSize(e);
      }

      /*
       * Update the size of the current rectangle and call repaint.
       * Because currentRect always has the same origin, translate it if
       * the width or height is negative.
       
       * For efficiency (though that isn't an issue for this program),
       * specify the painting region using arguments to the repaint()
       * call.
       *  
       */
      void updateSize(MouseEvent e) {
        int x = e.getX();
        int y = e.getY();
        currentRect.setSize(x - currentRect.x, y - currentRect.y);
        updateDrawableRect(getWidth(), getHeight());
        Rectangle totalRepaint = rectToDraw.union(previousRectDrawn);
        repaint(totalRepaint.x, totalRepaint.y, totalRepaint.width,
            totalRepaint.height);
      }
    }

    protected void paintComponent(Graphics g) {
      super.paintComponent(g)//paints the background and image

      //If currentRect exists, paint a box on top.
      if (currentRect != null) {
        //Draw a rectangle on top of the image.
        g.setXORMode(Color.white)//Color of line varies
        //depending on image colors
        g.drawRect(rectToDraw.x, rectToDraw.y, rectToDraw.width - 1,
            rectToDraw.height - 1);

        controller.updateLabel(rectToDraw);
      }
    }

    private void updateDrawableRect(int compWidth, int compHeight) {
      int x = currentRect.x;
      int y = currentRect.y;
      int width = currentRect.width;
      int height = currentRect.height;

      //Make the width and height positive, if necessary.
      if (width < 0) {
        width = - width;
        x = x - width + 1;
        if (x < 0) {
          width += x;
          x = 0;
        }
      }
      if (height < 0) {
        height = - height;
        y = y - height + 1;
        if (y < 0) {
          height += y;
          y = 0;
        }
      }

      //The rectangle shouldn't extend past the drawing area.
      if ((x + width> compWidth) {
        width = compWidth - x;
      }
      if ((y + height> compHeight) {
        height = compHeight - y;
      }

      //Update rectToDraw after saving old value.
      if (rectToDraw != null) {
        previousRectDrawn.setBounds(rectToDraw.x, rectToDraw.y,
            rectToDraw.width, rectToDraw.height);
        rectToDraw.setBounds(x, y, width, height);
      else {
        rectToDraw = new Rectangle(x, y, width, height);
      }
    }
  }
}

           
         
    
    
  














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