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geom2d

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geom2d

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13 Jun 2005 (Updated )

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

distancePointPolyline(point, poly, varargin)
function varargout = distancePointPolyline(point, poly, varargin)
%DISTANCEPOINTPOLYLINE  Compute shortest distance between a point and a polyline
%   output = distancePointPolyline(POINT, POLYLINE)
%
%   Example:
%       pt1 = [30 20];
%       pt2 = [30 5];
%       poly = [10 10;50 10;50 50;10 50];
%       distancePointPolyline([pt1;pt2], poly)
%       ans =
%           10
%            5
%
%   See also
%   polygons2d, points2d
%   distancePointEdge, projPointOnPolyline
%
% ------
% Author: David Legland
% e-mail: david.legland@grignon.inra.fr
% Created: 2009-04-30,    using Matlab 7.7.0.471 (R2008b)
% Copyright 2009 INRA - Cepia Software Platform.

%   HISTORY
%   2009-06-23 compute all distances in one call

% number of points
Np = size(point, 1);

% allocate memory for result
minDist = inf * ones(Np, 1);

% process each point
for p = 1:Np
    % construct the set of edges
    edges = [poly(1:end-1, :) poly(2:end, :)];
    
    % compute distance between current each point and all edges
    dist = distancePointEdge(point(p, :), edges);

    % update distance if necessary
    minDist(p) = min(dist);
end

% process output arguments
if nargout<=1
    varargout{1} = minDist;
end

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