(From aduros) AbstractRectangle.contains should contain bounds.

Points on the top and left edges are considered contained, so should points on
right and bottom. This also makes contains() consistent with outcode().

src/main/java/pythagoras/d/AbstractRectangle.java

@@ -108,7 +108,7 @@ public abstract class AbstractRectangle extends RectangularShape implements IRec
 
         px -= x;
         py -= y;
-        return px < width() && py < height();
+        return px <= width() && py <= height();
     }
 
     @Override // from interface IShape

src/main/java/pythagoras/f/AbstractRectangle.java

@@ -108,7 +108,7 @@ public abstract class AbstractRectangle extends RectangularShape implements IRec
 
         px -= x;
         py -= y;
-        return px < width() && py < height();
+        return px <= width() && py <= height();
     }
 
     @Override // from interface IShape