edgeToPolyline

EDGETOPOLYLINE Convert an edge to a polyline with a given number of segments.

   POLY = edgeToPolyline(EDGE, N)
   
   Example
     edge = [10 20 60 40];
     poly = edgeToPolyline(edge, 10);
     drawEdge(edge, 'lineWidth', 2);
     hold on
     drawPoint(poly);
     axis equal;

   See also
     edges2d, drawEdge, drawPolyline

 ------
 Author: David Legland
 e-mail: david.legland@grignon.inra.fr
 Created: 2011-11-25,    using Matlab 7.9.0.529 (R2009b)
 Copyright 2011 INRA - Cepia Software Platform.

0001 function poly = edgeToPolyline(edge, N)
0002 %EDGETOPOLYLINE Convert an edge to a polyline with a given number of segments.
0003 %
0004 %   POLY = edgeToPolyline(EDGE, N)
0005 %
0006 %   Example
0007 %     edge = [10 20 60 40];
0008 %     poly = edgeToPolyline(edge, 10);
0009 %     drawEdge(edge, 'lineWidth', 2);
0010 %     hold on
0011 %     drawPoint(poly);
0012 %     axis equal;
0013 %
0014 %   See also
0015 %     edges2d, drawEdge, drawPolyline
0016 %
0017 % ------
0018 % Author: David Legland
0019 % e-mail: david.legland@grignon.inra.fr
0020 % Created: 2011-11-25,    using Matlab 7.9.0.529 (R2009b)
0021 % Copyright 2011 INRA - Cepia Software Platform.
0022 
0023 if N < 1
0024     error('number of segments must be greater than 1');
0025 end
0026 
0027 
0028 if length(edge) == 4
0029     % case of planar edges
0030     p1 = edge(1:2);
0031     p2 = edge(3:4);
0032     poly = [linspace(p1(1), p2(1), N+1)' linspace(p1(2), p2(2), N+1)'];
0033     
0034 else
0035     % case of 3D edges
0036     p1 = edge(1:3);
0037     p2 = edge(4:6);
0038     poly = [...
0039         linspace(p1(1), p2(1), N+1)' ...
0040         linspace(p1(2), p2(2), N+1)' ...
0041         linspace(p1(3), p2(3), N+1)'];
0042 end