How to interpret result of outcode method of Rectangle2D.Double class

Question

I am trying to use Rectangle2D to determine position of a point with respect to a given rectangle.
Here is my code
Rectangle2D.Double rect = new Rectangle2D.Double(10,10,50,50);
          System.out.println(rect.outcode(10,10));
          System.out.println(rect.outcode(10,9));
          System.out.println(rect.outcode(9,10));
          System.out.println(rect.outcode(50,50));
          System.out.println(rect.outcode(60,60));
          System.out.println(rect.outcode(61,10));
          System.out.println(rect.outcode(61,61));
          System.out.println(rect.outcode(61,45));
Here are the results
0
2
1
0
0
4
12
4
I can understand when result is 0 then the point is either inside or on the Rectangle2D.Double object
I can assume if output is 1,2 3 or 4 it can be mean out_left, out_top, out_right, out_bottom but sometimes i get values like 5,9, 12 etc which I cannot figure out. What I can assume for these values
Any pointer to this will be helpful
Thanks Shantanu

Answer 1

Any time you see constants defined in powers of two you can suspect
that they may be added to form unique sums.
So these, found in the Constant Field Values of Rectangle2D
public static final int OUT_BOTTOM = 8
public static final int OUT_LEFT   = 1
public static final int OUT_RIGHT  = 4
public static final int OUT_TOP    = 2may indicate that something like this is possible/useful:
OUT_TOP                =  2    // N
OUT_TOP + OUT_LEFT     =  3    // NW
OUT_LEFT               =  1    // W
OUT_LEFT + OUT_BOTTOM  =  9    // SW
OUT_BOTTOM             =  8    // S
OUT_BOTTOM + OUT_RIGHT = 12    // SE
OUT_RIGHT              =  4    // E
OUT_RIGHT + OUT_TOP    =  6    // Ne
CENTER                 =  0    // inside