boxToPolygon

BOXTOPOLYGON Convert a bounding box to a square polygon.

   poly = boxToPolygon(box)
   Utility function that convert box data in [XMIN XMAX YMIN YMAX] format
   to polygon data corresponding to the box boundary. The resulting POLY
   is a 4-by-2 array.


   Example
     box = [ 10 50 20 40];
     poly = boxToPolygon(box)
     poly = 
         10    20
         50    20
         50    40
         10    40

   See also
     boxes2d, polygons2d, boxToRect

0001 function poly = boxToPolygon(box)
0002 %BOXTOPOLYGON Convert a bounding box to a square polygon.
0003 %
0004 %   poly = boxToPolygon(box)
0005 %   Utility function that convert box data in [XMIN XMAX YMIN YMAX] format
0006 %   to polygon data corresponding to the box boundary. The resulting POLY
0007 %   is a 4-by-2 array.
0008 %
0009 %
0010 %   Example
0011 %     box = [ 10 50 20 40];
0012 %     poly = boxToPolygon(box)
0013 %     poly =
0014 %         10    20
0015 %         50    20
0016 %         50    40
0017 %         10    40
0018 %
0019 %   See also
0020 %     boxes2d, polygons2d, boxToRect
0021  
0022 % ------
0023 % Author: David Legland
0024 % e-mail: david.legland@nantes.inra.fr
0025 % Created: 2017-09-10,    using Matlab 8.6.0.267246 (R2015b)
0026 % Copyright 2017 INRA - Cepia Software Platform.
0027 
0028 % extreme coordinates
0029 xmin = box(1);  
0030 xmax = box(2);
0031 ymin = box(3);  
0032 ymax = box(4);
0033 
0034 % convert to polygon
0035 poly = [...
0036     xmin ymin; ...
0037     xmax ymin; ...
0038     xmax ymax; ...
0039     xmin ymax];