frenet frame plot with arrows

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mustafa
mustafa 2014-8-13
回答： mustafa 2014-8-14
I use this m file for franet frame. It realy works well. But i want arrows instead of line. Please help me, it is very importand for me.
function z = curveframeplot (curve,parameter, start, fin,num,len)
newcurve=subs(curve,parameter , 't');
t= start:.01*(fin-start):fin;
x = eval(vectorize(newcurve(1)));
y = eval(vectorize(newcurve(2)));
w =eval(vectorize(newcurve(3)));
plot3(x,y,w)
hold on
curvevel=diff(curve);
curvetan=unitvec(curvevel);
curvenorm=unitvec(diff(curvetan));
curvebin=cross(curvetan,curvenorm);
t1=start:(fin-start)/num:fin;
newcurve1=subs(curve,parameter,'t1');
norm1=subs(curvenorm,parameter,'t1');
bin1=subs(curvebin,parameter,'t1');
x1 = eval(vectorize(newcurve1(1)));
y1 = eval(vectorize(newcurve1(2)));
w1 =eval(vectorize(newcurve1(3)));
xnorm = eval(vectorize(newcurve1(1)+len*norm1(1)));
ynorm = eval(vectorize(newcurve1(2)+len*norm1(2)));
wnorm=eval(vectorize(newcurve1(3)+len*norm1(3)));
xbin = eval(vectorize(newcurve1(1)+len*bin1(1)));
ybin = eval(vectorize(newcurve1(2)+len*bin1(2)));
wbin =eval(vectorize(newcurve1(3)+len*bin1(3)));
for n=1:length(t1)
plot3([x1(n),xnorm(n)],[y1(n),ynorm(n)],[w1(n),wnorm(n)],'red')
plot3([x1(n),xbin(n)],[y1(n),ybin(n)],[w1(n),wbin(n)],'green')
end
hold off

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回答（2 个）

Chad Greene
Chad Greene 2014-8-13
mustafa
mustafa 2014-8-14
Thank you, but all i need is that curveframeplot.m plots n and b vectors as line, i need them as a arrowhead, could you please modify the m file curveframeplot.m?

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