viewwithroi.java

Digital Image Processing: A Practical Introduction Using Java Nick Efford

/***************************************************************************

  ViewWithROI.java

  Written by Nick Efford.

  Copyright (c) 2000, Pearson Education Ltd.  All rights reserved.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

***************************************************************************/


package com.pearsoneduc.ip.gui;


import java.awt.*;
import java.awt.image.BufferedImage;


/**
 * A simple image display component that overlays a region of interest,
 * or ROI.  The ROI is represented as a coloured rectangular outline.
 * The colour can be modified if desired.  The component is repainted
 * whenever the ROI is changed.
 *
 * @author Nick Efford
 * @version 1.1 [1999/06/28]
 * @see java.awt.image.BufferedImage
 */

public class ViewWithROI extends ImageView {


  /////////////////////////// INSTANCE VARIABLES ///////////////////////////


  /** Region of interest (ROI). */
  private Rectangle region = new Rectangle();

  /** Colour of ROI outline. */
  private Color colour = Color.red;


  //////////////////////////////// METHODS /////////////////////////////////


  /**
   * Constructs a component to display the specified image.
   * @param image the BufferedImage to be displayed
   */

  public ViewWithROI(BufferedImage image) {
    super(image);
  }


  /**
   * Changes the region of interest that is drawn over the image.
   * @param x the x coordinate of the new region
   * @param y the y coordinate of the new region
   * @param w the width of the new region
   * @param h the height of the new region
   */

  public void setROI(int x, int y, int w, int h) {
    region.x = x;
    region.y = y;
    region.width = w;
    region.height = h;
    repaint();
  }

  /**
   * Changes the region of interest that is drawn over the image.
   * @param region ROI parameters, packed into a Rectangle
   */

  public void setROI(Rectangle region) {
    setROI(region.x, region.y, region.width, region.height);
  }


  /**
   * @return current region of interest for the displayed image.
   */

  public Rectangle getROI() {
    return new Rectangle(region.x, region.y, region.width, region.height);
  }


  /**
   * Changes the colour of the ROI outline drawn on the image.
   * @param c Color object defining the new colour of the outline
   */

  public void setROIColour(Color c) {
    colour = c;
  }


  /**
   * @return colour being used for ROI outline.
   */

  public Color getROIColour() {
    return colour;
  }


  /**
   * Paints component.
   * @param g graphics context of the component
   */

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;
    if (region.width > 0 && region.height > 0) {
      g2.setPaint(colour);
      g2.draw(region);
    }
  }


}