/usr/share/octave/packages/nurbs-1.3.10/nrbctrlplot.m is in octave-nurbs 1.3.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | function nrbctrlplot (nurbs)
% NRBCTRLPLOT: Plot a NURBS entity along with its control points.
%
% Calling Sequence:
%
% nrbctrlplot (nurbs)
%
% INPUT:
%
% nurbs: NURBS curve, surface or volume, see nrbmak.
%
% Example:
%
% Plot the test curve and test surface with their control polygon and
% control net, respectively
%
% nrbctrlplot(nrbtestcrv)
% nrbctrlplot(nrbtestsrf)
%
% See also:
%
% nrbkntplot
%
% Copyright (C) 2011, 2012 Rafael Vazquez
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
if (nargin < 1)
error ('nrbctrlplot: Need a NURBS to plot!');
end
% Default values
light='on';
cmap='summer';
colormap (cmap);
hold_flag = ishold;
if (iscell (nurbs.knots))
if (size (nurbs.knots,2) == 3)
nsub = 100;
nrbplot (nurbs, [nsub nsub nsub], 'light', light, 'colormap', cmap);
hold on
% Plot the control points
coefs = bsxfun (@rdivide, nurbs.coefs(1:3,:,:,:), nurbs.coefs(4,:,:,:));
coefs = reshape (coefs, 3, []);
plot3 (coefs(1,:), coefs(2,:), coefs(3,:), 'r.','MarkerSize',20);
% Plot the control net
for ii = 1:size (nurbs.coefs, 2)
for jj = 1:size (nurbs.coefs, 3)
coefs = reshape (nurbs.coefs(1:3,ii,jj,:), 3, []);
weights = reshape (nurbs.coefs(4,ii,jj,:), 1, []);
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'k--')
end
for kk = 1:size (nurbs.coefs, 4)
coefs = reshape (nurbs.coefs(1:3,ii,:,kk), 3, []);
weights = reshape (nurbs.coefs(4,ii,:,kk), 1, []);
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'k--')
end
end
for jj = 1:size (nurbs.coefs, 3)
for kk = 1:size (nurbs.coefs, 4)
coefs = reshape (nurbs.coefs(1:3,:,jj,kk), 3, []);
weights = reshape (nurbs.coefs(4,:,jj,kk), 1, []);
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'k--')
end
end
elseif (size (nurbs.knots,2) == 2) % plot a NURBS surface
nsub = 100;
nrbplot (nurbs, [nsub nsub], 'light', light, 'colormap', cmap);
hold on
% And plot the control net
for ii = 1:size (nurbs.coefs, 2)
coefs = reshape (nurbs.coefs(1:3,ii,:), 3, []);
weights = reshape (nurbs.coefs(4,ii,:), 1, []);
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'k--')
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'r.','MarkerSize',20)
end
for jj = 1:size (nurbs.coefs, 3)
coefs = reshape (nurbs.coefs(1:3,:,jj), 3, []);
weights = reshape (nurbs.coefs(4,:,jj), 1, []);
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'k--')
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'r.','MarkerSize',20)
end
end
else % plot a NURBS curve
nsub = 1000;
nrbplot (nurbs, nsub);
hold on
% And plot the control polygon
coefs = nurbs.coefs(1:3,:);
weights = nurbs.coefs(4,:);
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'k--')
plot3 (coefs(1,:)./weights, coefs(2,:)./weights, coefs(3,:)./weights,'r.','MarkerSize',20)
end
if (~hold_flag)
hold off
end
end
%!demo
%! crv = nrbtestcrv;
%! nrbctrlplot(crv)
%! title('Test curve')
%! hold off
%!demo
%! srf = nrbtestsrf;
%! nrbctrlplot(srf)
%! title('Test surface')
%! hold off
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