Draw line between several points 3d
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Hi,
I want to draw a line between several points to form a helix. I have matrix multiplication to create several S=[x;y;z] matrices. I managed to plot the points on 3D. But I couldn't connect the points together. So far, I have the following;
D=[-3.1869;5.8209;-0.9806]
theta=0
delta=0
a=0
while a<72
a=a+1
theta=theta+pi/10
delta=delta+1
Hz=[cos(theta),-sin(theta),0;sin(theta),cos(theta),0;0,0,(delta/-0.98058067569092)+1]
S=Hz*D
scatter3(S(1),S(2),S(3))
hold on
end
I tried to write "line(S(1),S(2),S(3))" inside and outside the while loop. But it didn't do. Any help will be appreciated. Thank you.
1 个评论
Daniel Armyr
2016-3-9
First, lets format your code as code:
D=[-3.1869;5.8209;-0.9806]
theta=0
delta=0
a=0
while a<72
a=a+1
theta=theta+pi/10
delta=delta+1
Hz=[cos(theta),-sin(theta),0;sin(theta),cos(theta),0;
0,0,(delta/-0.98058067569092)+1]
S=Hz*D
scatter3(S(1),S(2),S(3))
hold on
end
回答（1 个）
Daniel Armyr
2016-3-9
Here is code that will draw the helix with markers for each point.
D=[-3.1869;5.8209;-0.9806]
theta=0
delta=0
a=0
lastS = nan(3,1); %Add storage to save the last computed point.
view(3);
while a<72
a=a+1
theta=theta+pi/10
delta=delta+1
Hz=[cos(theta),-sin(theta),0;sin(theta),cos(theta),0;
0,0,(delta/-0.98058067569092)+1]
S=Hz*D
% Use the line command to draw individual line segments.
line( [lastS(1) S(1)], [lastS(2) S(2)], [lastS(3) S(3)], 'Marker', 'o' );
% And store the latest S to use to draw next line.
lastS = S;
end
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