File: fillMeshFaces.m

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## Copyright (C) 2024 David Legland
## All rights reserved.
## 
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
## 
##     1 Redistributions of source code must retain the above copyright notice,
##       this list of conditions and the following disclaimer.
##     2 Redistributions in binary form must reproduce the above copyright
##       notice, this list of conditions and the following disclaimer in the
##       documentation and/or other materials provided with the distribution.
## 
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## 
## The views and conclusions contained in the software and documentation are
## those of the authors and should not be interpreted as representing official
## policies, either expressed or implied, of the copyright holders.

function varargout = fillMeshFaces(varargin)
%FILLMESHFACES Fill the faces of a mesh with the specified colors.
%
%   fillMeshFaces(V, F, VERTEXCOLORS)
%   Colorizes a mesh by filling faces with an array of values. The colors
%   can be a NV-by-1 array of values, or a NV-by-3 array of values.
%   Face filling uses 'interp' coloring mode.
%
%   fillMeshFaces(V, F, FACECOLORS)
%   Colorizes the mesh by specifying the value or the color associated to
%   each face. Face filling uses 'flat' coloring mode.
%
%   fillMeshFaces(..., PNAME, PVALUE)
%   Specifies additional parameters that will be passed to the 'patch'
%   function.
%
%   Example
%     % Colorize mesh based on z-coordinate of vertices.
%     [v, f] = createIcosahedron;
%     values = v(:,3);
%     figure; axis equal; view(3);
%     fillMeshFaces(v, f, values);
%
%     % Colorize mesh using specific color for each face
%     [v, f] = createIcosahedron;
%     colors = jet(20);
%     figure; axis equal; view(3);
%     fillMeshFaces(v, f, colors);
%
%   See also 
%     drawMesh

% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2020-04-16, using Matlab 9.7.0.1247435 (R2019b) Update 2
% Copyright 2020-2023 INRAE - BIA Research Unit - BIBS Platform (Nantes)

%% Parse input arguments

% extract first argument
var1 = varargin{1};
varargin(1) = [];

% Check if first input argument is an axes handle
if isAxisHandle(var1)
    ax = var1;
    var1 = varargin{1};
    varargin(1) = [];
else
    ax = gca;
end

% Check if the input is a mesh structure
if isstruct(var1)
    % extract data to display
    vertices = var1.vertices;
    faces = var1.faces;
else
    % assumes input is given with vertices+faces arrays
    vertices = var1;
    faces = varargin{1};
    varargin(1) = [];
end

% next argument is face color
colors = varargin{1};
varargin(1) = [];

% adapt the face color key value depending on the size of the "color" input
% argument
faceColorMode = 'interp';
if size(colors, 1) == size(faces, 1)
    faceColorMode = 'flat';
end

% array FACES is a NF-by-NV indices array, with NV number of vertices of
% each face, and NF number of faces
h = patch('Parent', ax, ...
    'vertices', vertices, 'faces', faces, 'FaceVertexCData', colors, ...
    'FaceColor', faceColorMode, varargin{:});


%% Process output arguments

% format output parameters
if nargout > 0
    varargout = {h};
end