Image.java example

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/*********************************************************************
*
*      Copyright (C) 2004 Andrew Khan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***************************************************************************/

package jxl;

import jxl.common.LengthUnit;

import java.io.File;

/**
 * Accessor functions for an image
 */
public interface Image
{
  /**
   * Accessor for the image position
   *
   * @return the column number at which the image is positioned
   */
  public double getColumn();

  /**
   * Accessor for the image position
   *
   * @return the row number at which the image is positioned
   */
  public double getRow();

  /**
   * Accessor for the image dimensions
   *
   * @return  the number of columns this image spans
   */
  public double getWidth();

  /**
   * Accessor for the image dimensions
   *
   * @return the number of rows which this image spans
   */
  public double getHeight();

  /**
   * Accessor for the image file
   *
   * @return the file which the image references
   */
  public File getImageFile();

  /**
   * Accessor for the image data
   *
   * @return the image data
   */
  public byte[] getImageData();

  /**
   * Get the width of this image as rendered within Excel
   *
   * @param unit the unit of measurement
   * @return the width of the image within Excel
   */
  public double getWidth(LengthUnit unit);

  /**
   * Get the height of this image as rendered within Excel
   *
   * @param unit the unit of measurement
   * @return the height of the image within Excel
   */
  public double getHeight(LengthUnit unit);

  /**
   * Gets the width of the image.  Note that this is the width of the 
   * underlying image, and does not take into account any size manipulations
   * that may have occurred when the image was added into Excel
   *
   * @return the image width in pixels
   */
  public int getImageWidth();

  /**
   * Gets the height of the image.  Note that this is the height of the 
   * underlying image, and does not take into account any size manipulations
   * that may have occurred when the image was added into Excel
   *
   * @return the image height in pixels
   */
  public int getImageHeight();

  /**
   * Gets the horizontal resolution of the image, if that information
   * is available.
   *
   * @return the number of dots per unit specified, if available, 0 otherwise
   */
  public double getHorizontalResolution(LengthUnit unit);

  /**
   * Gets the vertical resolution of the image, if that information
   * is available.
   *
   * @return the number of dots per unit specified, if available, 0 otherwise
   */
  public double getVerticalResolution(LengthUnit unit);
}