/* Copyright 2010 ESRI
* 
* All rights reserved under the copyright laws of the United States
* and applicable international laws, treaties, and conventions.
* 
* You may freely redistribute and use this sample code, with or
* without modification, provided you include the original copyright
* notice and use restrictions.
* 
* See the use restrictions.
* 
*/
package arcgissamples.scenario.map;

import java.awt.Dimension;

/**This class is used for rendering offscreen image
 */

public class Display {

  java.awt.Image offscrn = null;
  int width = 0;
  int height = 0;

  java.awt.Graphics2D gx;

  ImagePainter observer = new ImagePainter();

  public void display() {
  }

  /** Draws the image on the specified graphics object. If dispose is set to true
   * the image is flushed to free the resources
   * @param g
   * @param dx1
   * @param dy1
   * @param wd
   * @param ht
   * @param dispose
   */

  public void paint(java.awt.Graphics g, int dx1, int dy1, int wd, int ht, boolean dispose) {
    observer.start(offscrn, g, dx1, dy1, wd, ht, dispose);
  }

  /**Returns the display screen size
   * @return
   */

  @SuppressWarnings("unused")
  private Dimension getSize() {
    return new Dimension(width, height);
  }

  /**Returns the offscreen graphics object
   * @return java.awt.Graphics2D
   */

  public java.awt.Graphics2D getGraphics() {
    if (gx == null)
      gx = (java.awt.Graphics2D) offscrn.getGraphics();
    return gx;
  }

  /**Creates buffered image
   * @param w
   * @param h
   * @return
   */


  private static java.awt.image.BufferedImage createImage(int w, int h) {
    return new java.awt.image.BufferedImage(w, h, java.awt.image.BufferedImage.TYPE_INT_RGB);
  }

  /**Sets the width and height for offscreen image
   *
   * @param w
   * @param h
   */

  public void setSize(int w, int h) {
    width = w;
    height = h;
    if (w > 0 && h > 0) {
      if (offscrn != null)
        offscrn.flush();
      offscrn = createImage(width, height);
      gx = (java.awt.Graphics2D) offscrn.getGraphics();
    }
  }

}