螺旋片
close all;
clc;
clear;
N=90;
Na=30;
R=0.8;
xd=[0,0];
yd=[1,4];
zd=[1,1];
set(gcf,'Position',[7 266 560 420]);
plot3(xd,yd,zd,'k');
axis([0,3,0,5,0,3]);
axis equal;
hold on;
xn(1)=0;
yn(1)=4;
zn(1)=1+R;
dy=3/N;
dA=pi*2/Na;
plot3([xn(1),xd(1)],[yn(1),yd(2)],[zn(1),zd(1)],'k');
view([-49,32]);
A=0;
C=[0.1,0.3,0.9];
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rand('state',1)
Cr=rand(Na,3);
for k=1:N;
A=A-dA;
xn(k+1)=R*sin(A);
yn(k+1)=yn(k)-dy;
zn(k+1)=1+R*cos(A);
plot3([xn(k+1),xd(1)],[yn(k+1),yn(k+1)],[zn(k+1),zd(1)],'k');
plot3([xn(k+1),xn(k)],[yn(k+1),yn(k)],[zn(k+1),zn(k)],'k');
F=fill3([xn(k),xn(k+1),xn(1),xn(1)],...
[yn(k),yn(k+1),yn(k+1),yn(k)],...
[zn(k),zn(k+1),zd(1),zd(1)],Cr(mod(k-1,Na)+1,:),...
'EdgeColor',Cr(mod(k-1,Na)+1,:));
end
text(0,3,2.2,'{\ithelix}','Fontsize',18,...
'Fontname','Times new roman');
axis off;
结果如下：
