Code covered by the BSD License

# geom2d

### David Legland (view profile)

13 Jun 2005 (Updated )

Geometry library for matlab. Performs geometric computations on points, lines, circles, polygons...

splitPolygons(polygon)
```function polygons = splitPolygons(polygon)
%SPLITPOLYGONS Convert a NaN separated polygon list to a cell array of polygons
%
%   POLYGONS = splitPolygons(POLYGON);
%   POLYGON is a N*2 array of points, with possibly couples of NaN values.
%   The functions separates each component separated by NaN values, and
%   returns a cell array of polygons.
%
%   polygons2d
%
% ------
% Author: David Legland
% e-mail: david.legland@grignon.inra.fr
% Created: 2007-10-12,    using Matlab 7.4.0.287 (R2007a)
% Copyright 2007 INRA - BIA PV Nantes - MIAJ Jouy-en-Josas.

if iscell(polygon)
% case of a cell array
polygons = polygon;

elseif sum(isnan(polygon(:))) == 0
% single polygon -> no break
polygons = {polygon};

else
% find indices of NaN couples
inds = find(sum(isnan(polygon), 2) > 0);

% number of polygons
N = length(inds) + 1;
polygons = cell(N, 1);

% iterate over NaN-separated regions to create new polygon
inds = [0; inds; size(polygon, 1)+1];
for i = 1:N
polygons{i} = polygon((inds(i)+1):(inds(i+1)-1), :);
end
end
```