function dist = distancePointLine(point, line)
%DISTANCEPOINTLINE Minimum distance between a point and a line
% D = distancePointLine(POINT, LINE)
% Return the euclidean distance between line LINE and point POINT.
% LINE has the form : [x0 y0 dx dy], and POINT is [x y].
% If LINE is N-by-4 array, result is N-by-1 array computes for each line.
% If POINT is N-by-2, then result is computed for each point.
% If both POINT and LINE are array, result is N-by-1, computed for each
% corresponding point and line.
% See also:
% lines2d, points2d, distancePoints, distancePointEdge
% author : David Legland
% INRA - CEPIA URPOI - MIA MathCell
% created the 24/06/2005
% HISTORY :
if size(line, 1)==1 && size(point, 1)>1
line = repmat(line, [size(point, 1) 1]);
if size(point, 1)==1 && size(line, 1)>1
point = repmat(point, [size(line, 1) 1]);
dx = line(:, 3);
dy = line(:, 4);
% compute position of points projected on line
tp = ((point(:, 2) - line(:, 2)).*dy + (point(:, 1) - line(:, 1)).*dx) ./ (dx.*dx+dy.*dy);
p0 = line(:, 1:2) + [tp tp].*[dx dy];
% compute distances between points and their projections
dx = point - p0;
dist = sqrt(sum(dx.*dx, 2));