MATLAB Answers

How do I create a continuously updating pie chart?

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Aaron Piolat
Aaron Piolat on 15 Oct 2021
Answered: Pavan Guntha on 20 Oct 2021
Hi, I am having problems adding a pie chart that updates when the functions update. The goal is to have a figure filling out an area (an array, that is being transformed from ones to zeros), as well as a chart that, if possible, continuously updates, preferably with percentage. I would guess adding something like "pie((numel(x)/numel(x))*100)", where x is the amount of zeros? I am very new to Matlab so any tips would be much appreciated! Here is what I have so far:
x = 3.0;
y = 3.0;
theta = 20;
xt = cosd(theta);
grass = [0 0.7 0.2
0.4 0.6 0
0.4 0.2 0];
A = ones(30, 20);
A(:, 1) = 2; %B1 = A(:,1);
A(:,20) = 2; %B2 = A(:,20);
A(30,:) = 2; %B3 = A(30,:);
A(1,:) = 2; %B4 = A(1,:);
%A(2,2) = 0;
imagesc(A)
colormap(grass)
axis equal
while sum(A, 'all') > 192
if A(round(y),round(x)+2) == 2
xt = -cosd(theta);
elseif A(round(y),round(x)-2) == 2
xt = cosd(theta);
end
if A(round(y)+2,round(x)) == 2
theta = -abs(theta);
elseif A(round(y)-2,round(x)) == 2
theta = abs(theta);
end
x = x + xt;
y = y + sind(theta);
A(round(y),round(x+1)) = 0;
A(round(y),round(x-1)) = 0;
A(round(y+1),round(x)) = 0;
A(round(y-1),round(x)) = 0;
A(round(y+1),round(x-1)) = 0;
A(round(y+1),round(x+1)) = 0;
A(round(y-1),round(x-1)) = 0;
A(round(y-1),round(x+1)) = 0;
disp("x = "+x+" y = "+y)
imagesc(A)
axis equal
pause(0.0000001)
end
disp(x+" Done "+y)

Answers (1)

Pavan Guntha
Pavan Guntha on 20 Oct 2021
Hello Aaron,
You could use pie command to plot a pie chart. In order to update it dynamically, you could include the pie chart functionality into the while loop in your code as follows:
figure(1)
imagesc(A)
colormap(grass)
axis equal
while sum(A, 'all') > 192
if A(round(y),round(x)+2) == 2
xt = -cosd(theta);
elseif A(round(y),round(x)-2) == 2
xt = cosd(theta);
end
if A(round(y)+2,round(x)) == 2
theta = -abs(theta);
elseif A(round(y)-2,round(x)) == 2
theta = abs(theta);
end
x = x + xt;
y = y + sind(theta);
A(round(y),round(x+1)) = 0;
A(round(y),round(x-1)) = 0;
A(round(y+1),round(x)) = 0;
A(round(y-1),round(x)) = 0;
A(round(y+1),round(x-1)) = 0;
A(round(y+1),round(x+1)) = 0;
A(round(y-1),round(x-1)) = 0;
A(round(y-1),round(x+1)) = 0;
disp("x = "+x+" y = "+y)
figure(1)
imagesc(A)
axis equal
% Pie Chart Plotting functionality
figure(2)
pie([sum(A==0, "all") sum(A~=0, "all")], '%.3f%%')
labels = {'Covered Region', 'Uncovered Region'};
legend(labels,"Location","northeast")
pause(0.0000001)
end
The result of the above code is as follows where the data presented in the Pie chart gets updated in every iteration:
Hope this helps!

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