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Change the position of a pie chart

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Alessia Giorgi
Alessia Giorgi on 21 Dec 2022
Commented: Mathieu NOE on 31 Jan 2023
Hi everyone,
I'd like to change the position of a pie chart from "Initial position" to "Final position" (see figure below).
Can anyone help me?
Thank you.
Alessia

Answers (2)

Mathieu NOE
Mathieu NOE on 21 Dec 2022
hello
try this
X = [0.1 0.2 0.2];
subplot(1,2,1),
pie(X);
subplot(1,2,2),
pie(X);
set(gca, 'CameraViewAngleMode', 'manual', 'CameraTargetMode', 'manual', ...
'CameraPositionMode', 'manual');
ang = 3*pi/2;
set(gca, 'CameraUpVector', [sin(ang), cos(ang), 0]);
  3 Comments
Mathieu NOE
Mathieu NOE on 22 Dec 2022
My pleasure !
If my submission fullfills your request, do you mind accepting it ?
tx
Mathieu NOE
Mathieu NOE on 31 Jan 2023
hello again
If my submission fullfills your request, do you mind accepting it ?
tx

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Adam Danz
Adam Danz on 21 Dec 2022
Edited: Adam Danz on 22 Dec 2022
The solution below rotates the set of objects that create a pie chart by using an hgtransform.
The text label alignment needs updated since the initial alignment is designed to be to the left of the pie segments but after rotation, the labels should be centered above the segments. The text alignment adjustment is fairly easy for this example but if the pie chart contained all segements around the circle, a bit more work would be needed to assign the best alignment property values.
% Create initial pie chart
ax = axes();
h = pie([.167 .167 .167]);
% rotate 90 deg clockwise
ang = -90; % angle of rotation, degrees, negative is clockwise
tform = hgtransform('Parent',ax);
set(h, 'Parent', tform)
Rz = makehgtform('zrotate',ang*pi/180);
set(tform,'Matrix',Rz)
% Adjust text label alignment
tobj = findobj(h,'type','text');
set(tobj, 'VerticalAlignment', 'Bottom', 'HorizontalAlignment', 'Center')

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