demokntins.m

非均匀有理B样条的matlab程序

function demokntins
% Demonstration of the knot insertion algorithm.
%

% D.M. Spink
% Copyright (c) 2000.

crv = nrbtestcrv;

% plot the control points
plot(crv.coefs(1,:),crv.coefs(2,:),'bo')
title('Knot insertion along test curve.');
hold on;
plot(crv.coefs(1,:),crv.coefs(2,:),'b--');

% draw nurbs curve
nrbplot(crv,48);

% insert new knots and plot new control points
icrv = nrbkntins(crv,[0.125 0.375 0.625 0.875] );
plot(icrv.coefs(1,:),icrv.coefs(2,:),'ro')
plot(icrv.coefs(1,:),icrv.coefs(2,:),'r--');

hold off;