How do I create a continuously updating pie chart?

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)

Answer 1

[Pavan Guntha]

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!