How can I Draw a Line on a 3D plot?

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Joshua Mitchell
Joshua Mitchell 2021년 6월 22일
댓글: Bretislav Kubes 2023년 1월 5일
I am trying to draw a red line across a 3D surface plot for an app:
I have the 2D plot coded to do this as follows:
surf(app.UIAxes2,Bat);
ylim(app.UIAxes2, [0 60]);
xlim(app.UIAxes2, [0 60]);
view(app.UIAxes2,2);
app.UIAxes2.PositionConstraint = 'outerposition';
xline(app.UIAxes2,value,'Color','red','LineStyle','-','LineWidth',1.5);
but the xline command will not work for the 3D plot, as it does not follow the Z data and draws a line straight through the dipole I am modelling.
"value" in the above code is whatever line is selected by the app user.
"Bat" is the matrix data I am modelling.
Does anyone know how to plot a red line like this that will contour to my Z data? Here is the code for my 3D plot below:
surf(app.UIAxes3,Bat);
ylim(app.UIAxes3, [0 60]);
xlim(app.UIAxes3, [0 60]);
view(app.UIAxes3,3);
app.UIAxes3.PositionConstraint = 'outerposition';
ztickformat(app.UIAxes3,'%g');
ax = app.UIAxes3;
ax.ZAxis.Exponent = 0;
Any help is appreciated, thank you.
  댓글 수: 2
Scott MacKenzie
Scott MacKenzie 2021년 6월 22일
Have your tried line, instead of xline? It allows for x, y, and z input arguments.
Joshua Mitchell
Joshua Mitchell 2021년 6월 23일
I am trying to use line and it seems like it is possible, but I'm having a hard time figuring out how it should work with my data specifically.
I've tried:
surf(app.UIAxes3,Bat);
ylim(app.UIAxes3, [0 60]);
xlim(app.UIAxes3, [0 60]);
view(app.UIAxes3,3);
app.UIAxes3.PositionConstraint = 'outerposition';
ztickformat(app.UIAxes3,'%g');
ax = app.UIAxes3;
ax.ZAxis.Exponent = 0;
line(app.UIAxes3,Bat(value,:),Bat(:,value),Bat(:,10),'Color','red','LineStyle','--','LineWidth',1.5);
And it is giving me strange lines like:
It is probably just how I am setting the x,y,z value but I can't seem to come up with a decent line.

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채택된 답변

Scott MacKenzie
Scott MacKenzie 2021년 6월 24일
편집: Scott MacKenzie 2021년 6월 24일
Here's an example using line. I used your code, but re-assigned ax.UIAxes2, Bat, and value so the code would execute on my machine.
UIAxes3 = gca; % your app.UIAxes3
Bat = peaks; % for testing
value = 30; % test value
surf(UIAxes3, Bat);
ylim(UIAxes3, [0 60]);
xlim(UIAxes3, [0 60]);
view(UIAxes3, 3);
UIAxes3.PositionConstraint = 'outerposition';
ztickformat(UIAxes3,'%g');
UIAxes3.ZAxis.Exponent = 0;
x = 1:size(Bat,2);
y = ones(1,size(Bat,2)) * value;
z = Bat(value,:);
line(UIAxes3,x,y,z,'Color','red','LineStyle','--','LineWidth',2.5);
  댓글 수: 3
Scott MacKenzie
Scott MacKenzie 2021년 6월 25일
편집: Scott MacKenzie 2021년 6월 25일
You need to change z as well, to pull z data along the y-axis instead of the x-axis:
z = Bat(:,value);
Joshua Mitchell
Joshua Mitchell 2021년 6월 25일
Of course! Thank you so much, I really appreciate it.

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추가 답변 (1개)

KSSV
KSSV 2021년 6월 24일
[X,Y,Z] = peaks(100) ;
% DRaw a line at origin
x = linspace(-3,3) ;
y = repelem(0,1,length(x)) ;
z = interp2(X,Y,Z,x,y) ;
% plot
surf(X,Y,Z)
hold on
plot3(x,y,z,'r','linewidth',3)
  댓글 수: 1
Bretislav Kubes
Bretislav Kubes 2023년 1월 5일
Wonderful easy solution, thanks!

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