display.java

来自「一个TSP问题的图形演示程序」· Java 代码 · 共 59 行

/*
 *  This code is from the book:
 *
 *    Winder, R and Roberts, G (2000) Developing Java
 *    Software, second edition, John Wiley & Sons.
 *
 *  It is copyright (c) 2000 Russel Winder and Graham Roberts.
 */

package SimFrameWork ;
/**
 *  Abstract Display class for rendering grids.
 *
 *  @version 2.0 March 1999
 *  @author Graham Roberts
 */
public abstract class Display {
  /**
   *  Create new display for a grid of given grid size.  Use x,y
   *  coordinates to refer to patches.  In this abstract class the
   *  width and height are given in terms of the number of patches,
   *  not any graphics unit.
   *
   *  @param w width in patches of display.
   *  @param h height in patches of display.
   */
  public Display(int w, int h) {
    width = w ;
    height = h ;
  }
  /**
   *  Display patch at x,y with value c.
   *
   *  @param x patch x coordinate.
   *  @param y patch y coordinate.
   *  @param c value of patch to be displayed
   */
  public abstract void show(int x,int y,int c) ;
  // The following methods should be overridden by derived classes
  // but may be defined to do nothing, depending on the way the
  // actual display class works.
  /**
   *  Clear display area so it is blank.
   */
  public abstract void clear() ;
  /**
   *  Update display to show current grid.
   */
  public abstract void showGrid() ;
  /**
   *  Display width in patches.
   */
  protected int width ;
  /**
   *  Display height in patches.
   */
  protected int height ;
}