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## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## 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.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{h} =} drawCylinder (@var{cyl})
## @deftypefnx {Function File} {@var{h} =} drawCylinder (@var{cyl},@var{n})
## @deftypefnx {Function File} {@var{h} =} drawCylinder (@dots{}, @var{opt})
## @deftypefnx {Function File} {@var{h} =} drawCylinder (@dots{}, @asis{"Facecolor"},@var{color})
## @deftypefnx {Function File} {@var{h} =} drawCylinder (@dots{})
## Draw a cylinder
##
## drawCylinder(@var{cyl})
## where @var{cyl} is a cylinder defined by [x1 y1 z1 x2 y2 z2 r]:
## [x1 y2 z1] are coordinates of starting point, [x2 y2 z2] are
## coordinates of ending point, and R is the radius of the cylinder,
## draws the corresponding cylinder on the current axis.
##
## drawCylinder(@var{cyl}, @var{N})
## uses @var{N} points for discretisation of angle. Default value is 32.
##
## drawCylinder(..., @var{opt})
## with @var{opt} = 'open' (default) or 'closed', specify if bases of the
## cylinder should be drawn.
##
## drawCylinder(..., @asis{"FaceColor"}, @var{color})
## Specifies the color of the cylinder. Any couple of parameters name and
## value can be given as argument, and will be transfered to the 'surf'
## matlab function
##
## @var{h} = drawCylinder(...)
## returns a handle to the patch representing the cylinder.
##
## Run @code{demo drawCylinder} to see several examples.
##
## WARNING: This function doesn't work in gnuplot (as of version 4.2).
##
## @seealso{drawSphere, drawLine3d, surf}
## @end deftypefn
function varargout = drawCylinder(cyl, varargin)
## Input argument processing
if iscell(cyl)
res = zeros(length(cyl), 1);
for i=1:length(cyl)
res(i) = drawCylinder(cyl{i}, varargin{:});
end
if nargout>0
varargout{1} = res;
end
return;
end
# default values
N = 32;
closed = true;
# check number of discretization steps
if ~isempty(varargin)
var = varargin{1};
if isnumeric(var)
N = var;
varargin = varargin(2:end);
end
end
# check if cylinder must be closed or open
if ~isempty(varargin)
var = varargin{1};
if ischar(var)
if strncmpi(var, 'open', 4)
closed = false;
varargin = varargin(2:end);
elseif strncmpi(var, 'closed', 5)
closed = true;
varargin = varargin(2:end);
end
end
end
## Computation of mesh coordinates
# extreme points of cylinder
p1 = cyl(1:3);
p2 = cyl(4:6);
# radius of cylinder
r = cyl(7);
# compute orientation angle of cylinder
[theta phi rho] = cart2sph2d(p2 - p1);
dphi = linspace(0, 2*pi, N+1);
# generate a cylinder oriented upwards
x = repmat(cos(dphi) * r, [2 1]);
y = repmat(sin(dphi) * r, [2 1]);
z = repmat([0 ; rho], [1 length(dphi)]);
# transform points
trans = localToGlobal3d(p1, theta, phi, 0);
pts = transformPoint3d([x(:) y(:) z(:)], trans);
# reshape transformed points
x2 = reshape(pts(:,1), size(x));
y2 = reshape(pts(:,2), size(x));
z2 = reshape(pts(:,3), size(x));
## Display cylinder mesh
# add default drawing options
varargin = [{'FaceColor', 'g', 'edgeColor', 'none'} varargin];
# plot the cylinder as a surface
hSurf = surf(x2, y2, z2, varargin{:});
# eventually plot the ends of the cylinder
if closed
ind = find(strcmpi(varargin, 'facecolor'), 1, 'last');
if isempty(ind)
color = 'k';
else
color = varargin{ind+1};
end
patch(x2(1,:)', y2(1,:)', z2(1,:)', color, 'edgeColor', 'none');
patch(x2(2,:)', y2(2,:)', z2(2,:)', color, 'edgeColor', 'none');
end
# format ouptut
if nargout == 1
varargout{1} = hSurf;
end
endfunction
%!demo
%! figure;
%! h = drawCylinder([0 0 0 10 20 30 5],'FaceColor', 'r');
%! set(h, 'facecolor', 'g');
%! axis equal
%! view([60 30])
%!
%! figure;
%! drawCylinder([0 0 0 10 20 30 5], 'open');
%! axis equal
%! view([60 30])
%!
%! figure;
%! drawCylinder([0 0 0 10 20 30 5], 'FaceColor', 'r');
%! axis equal
%! view([60 30])
%!
%! figure;
%! h = drawCylinder([0 0 0 10 20 30 5]);
%! set(h, 'facecolor', 'b');
%! axis equal
%! view([60 30])
%!demo
%! # Draw three mutually intersecting cylinders
%! p0 = [30 30 30];
%! p1 = [90 30 30];
%! p2 = [30 90 30];
%! p3 = [30 30 90];
%!
%! figure;
%! drawCylinder([p0 p1 25], 'FaceColor', 'r');
%! hold on
%! drawCylinder([p0 p2 25], 'FaceColor', 'g');
%! drawCylinder([p0 p3 25], 'FaceColor', 'b');
%! axis equal
%! view([60 30])
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