RandomLayout


1   package prefuse.action.layout;
2   
3   import java.awt.geom.Rectangle2D  ;
4   import java.util.Iterator  ;
5   import java.util.Random  ;
6   
7   import prefuse.visual.VisualItem;
8   
9   
10  /**
11   * Performs a random layout of items within the layout bounds.
12   *
13   * @author <a HREF="http://jheer.org">jeffrey heer</a>
14   */
15  public class RandomLayout extends Layout {
16  
17      private Random   r = new Random  (12345678L);
18      
19      /**
20       * Create a new RandomLayout that processes all items.
21       */
22      public RandomLayout() {
23          super();
24      }
25      
26      /**
27       * Create a new RandomLayout.
28       * @param group the data group to layout
29       */
30      public RandomLayout(String   group) {
31          super(group);
32      }
33  
34      /**
35       * Set the seed value for the random number generator.
36       * @param seed the random seed value
37       */
38      public void setRandomSeed(long seed) {
39          r.setSeed(seed);
40      }
41      
42      /**
43       * @see prefuse.action.Action#run(double)
44       */
45      public void run(double frac) {
46          Rectangle2D   b = getLayoutBounds();
47          double x, y;
48          double w = b.getWidth();
49          double h = b.getHeight();
50          Iterator   iter = getVisualization().visibleItems(m_group);
51          while ( iter.hasNext() ) {
52              VisualItem item = (VisualItem)iter.next();
53              x = (int)(b.getX() + r.nextDouble()*w);
54              y = (int)(b.getY() + r.nextDouble()*h);
55              setX(item,null,x);
56              setY(item,null,y);
57          }
58      }
59  
60  } // end of class RandomLayout
61
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