function h = drawPoint3d(varargin)
%DRAWPOINT3D Draw 3D point on the current axis.
%
%   drawPoint3d(X, Y, Z) 
%   will draw points defined by coordinates X, Y and Z. 
%   X, Y and Z are N*1 array, with N being number of points to be drawn.
%   
%   drawPoint3d(COORD) packs coordinates in a single [N*3] array.
%
%   drawPoint3d(..., OPT) will draw each point with given option. OPT is a 
%   string compatible with 'plot' model.
%
%   drawPoint3d(AX,...) plots into AX instead of GCA.
%
%   H = drawPoint3d(...) returns a handle H to the line object
%
%   Example
%     % generate points on a 3D circle
%     pts = circleToPolygon([40 30 20], 120);
%     mat = eulerAnglesToRotation3d([30 20 10]);
%     pts3d = transformPoint3d([pts zeros(120,1)],mat);
%     figure; drawPoint3d(pts3d, 'b.');
%     view(3); axis equal;
%
%   See also 
%     points3d, clipPoints3d, drawPoint
%

% ------
% Author : David Legland 
% E-mail: david.legland@inrae.fr
% Created: 2005-02-18
% Copyright 2005-2023 INRA - TPV URPOI - BIA IMASTE

%

if isAxisHandle(varargin{1})
    hAx = varargin{1};
    varargin(1)=[];
else
    hAx = gca;
end

if length(varargin) == 1 && size(varargin{1}, 2) == 3
    % points are given as one single array with 3 columns
    px = varargin{1}(:,1);
    py = varargin{1}(:,2);
    pz = varargin{1}(:,3);
    varargin = {};
elseif length(varargin) == 2 && size(varargin{1}, 2) == 3
    % points are given as one single array with 3 columns
    px = varargin{1}(:,1);
    py = varargin{1}(:,2);
    pz = varargin{1}(:,3);
    varargin = varargin(2);
elseif length(varargin) >= 3 && size(varargin{1}, 2) == 3
    % points are given as one single array with 3 columns
    px = varargin{1}(:,1);
    py = varargin{1}(:,2);
    pz = varargin{1}(:,3);
    varargin = varargin(2:end);
elseif length(varargin) == 3 && numel(varargin{1})==numel(varargin{2}) && numel(varargin{1})==numel(varargin{3})
    % points are given as 3 columns with equal lengths
    px = varargin{1};
    py = varargin{2};
    pz = varargin{3};
    varargin = {};
elseif length(varargin) > 3
    % points are given as 3 columns with equal lengths
    px = varargin{1};
    py = varargin{2};
    pz = varargin{3};
    varargin = varargin(4:end);
else
    error('wrong number of arguments in drawPoint3d');
end

% default draw style: no line, marker is 'o'
if length(varargin) ~= 1
    varargin = ['linestyle', 'none', 'marker', 'o', varargin];
end

% plot only points inside the axis.
hh = plot3(hAx, px, py, pz, varargin{:});

if nargout > 0
    h = hh;
end