matlab实现三次贝塞尔曲线

根据bezier定义

% Bezier Square Curve Ploter

% This file will create a Bezier square curve and dispay the plot.

% The parameter is the Vertex matrix.

function [X] = bezier2(Vertex)

BCon=[1 -2 1;-2 2 0;1 0 0]; % constant Matrix

for i = 1:1:50

par = (i - 1)/49;

XY(i,:) = [par^2 par 1]*BCon*Vertex; % create data

end

% display the vertices and the curve using Matlabs built-in graphic functions

clf % this will clear the figure

plot(Vertex(:,1),Vertex(:,2),'ro',XY(:,1),XY(:,2),'b-')

% create a plot of both the V ertices and curve, the vertices will be red “o”

% while the curve is blue line

line(Vertex(:,1),Vertex(:,2),'color','g') % add the control polygon.

xlabel(' x ')

ylabel ('y ')

title('Square Bezier Curve')

legend('控制顶点','Bezier曲线','控制多边形') % you can move the legend on the plot

然后，在命令行定义Bez2Vertex=[ 0 0 ; 0.3 0.7 ; 1.0 0.2]，即定义，，，再在命令行输入bezier2(Bez2Vertex)