贝塞尔曲线以及B样条曲线的Matlab函数

function spline(n,order) % function spline(n,order) % % Plots the B-slpine-curve of n control-points. % The control points can be chosen by clicking % with the mouse on the figure. % % COMMAND: spline(n,order) % INPUT: n Number of Control-Points % order Order ob B-Splines % Argnument is arbitrary % default: order = 4 % % Date: 2007-11-28 % Author: Stefan H�eber close all; if (nargin ~= 2) order = 4; end nplot = 100; if (n < order) display([' !!! Error: Choose n >= order=',num2str(order),' !!!']); return; end figure(1); hold on; box on; set(gca,'Fontsize',16); t = linspace(0,1,nplot); for i = 1:n title(['Choose ',num2str(i),' th. control point']); p(i,:) = ginput(1); hold off; plot(p(:,1),p(:,2),'k-','LineWidth',2); axis([0 1 0 1]); hold on; box on; if (i >= order) T = linspace(0,1,i-order+2); y = linspace(0,1,1000); p_spl = DEBOOR(T,p,y,order); plot(p_spl(:,1),p_spl(:,2),'b-','LineWidth',4); end plot(p(:,1),p(:,2),'ro','MarkerSize',10,'MarkerFaceColor','r'); end title(['B-Spline-curve with ',num2str(n),' control points of order ',num2str(order)]);