%% Copyright (C) 2003 Mark Spink %% %% 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 2 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/>. function demodercrv % Demonstrates the construction of a general % curve and determine of the derivative. % % make and draw nurbs test curve crv = nrbtestcrv; nrbplot(crv,48); title('First derivatives along a test curve.'); npts = 9; tt = linspace(0.0,1.0,npts); dcrv = nrbderiv(crv); % first derivative [p1, dp] = nrbdeval(crv,dcrv,tt); p2 = vecnorm(dp); hold on; plot(p1(1,:),p1(2,:),'ro'); h = quiver(p1(1,:),p1(2,:),p2(1,:),p2(2,:),0); set(h,'Color','black'); hold off;

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