MATLAB Answers

Filling pie graph partitions without the Pie command

1 view (last 30 days)
Daniel
Daniel on 26 Dec 2019
Answered: Chidvi Modala on 30 Dec 2019
Hi everyone,
I have created a code which basically produces a pie graph between two rings, but I am stuck at filling my partitions with different colors. Does anyone have an Idea to how to solve this? I tried using patch and fill but I can't seem to get them to follow the circles (they just connect the endlines of the partition with a line, not following the circle)

  2 Comments

Sergey Kasyanov
Sergey Kasyanov on 27 Dec 2019
I will try to complete your code if you attache it or I will write my own code for plotiing a pie with filled sectors.
Daniel
Daniel on 27 Dec 2019
I have found a solution which does the job but isn't very nice. It's basically plotting a lot of fat lines to fill the circle.
Thanks anyways for the quick reply!

Sign in to comment.

Answers (1)

Chidvi Modala
Chidvi Modala on 30 Dec 2019
You can make you of following code
function pie_chart
% Define quadrants and color
r1 = 1; % Outer radius
r = 0.5; % Inner radius
v = [5 15 25 20 35];
C = {'r' 'b' 'm' 'c' 'g'};
theta= 0:0.01:2*pi;
idx_spokes = round( [1 cumsum(v)/100*length(theta) ] ) ; % find the indices of the spokes
for k=1:length(idx_spokes)-1
t = theta( idx_spokes(k):idx_spokes(k+1) ) ; % Theta for Inner ring
si=theta( idx_spokes(k)); % Start index of polygon to be filled
t1 = theta( idx_spokes(k+1):-1:idx_spokes(k) ) ; % Theta for Outer ring
x=[r*cos(t) r1*cos(t1) r*cos(si)];
y=[r*sin(t) r1*sin(t1) r*sin(si)];
plot(x,y);
hold on
fill(x,y, C{k} );
end
axis square
axis on

  0 Comments

Sign in to comment.

Tags

Products