color area between two shapes

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Khoder Makkawi
Khoder Makkawi on 21 Apr 2021
Commented: Khoder Makkawi on 22 Apr 2021
I have two shapes and I want to color the area between them
The first shape is a circle of Radius R=10 for example and with center (0,0), and the second shape is a random shape but surrounds the cirle and may have communs points, but it is impossible to have points inside the circle (as in the picture).
As example for real data that I have:
load('data.mat'); % load the coordinates of the second random shape represented as 'xfs' and 'yfs'
%%%%%%%%% create the circle %%%%%%%%%%
R = 10; C = [0. 0.] ;
xcf = C(1)+R*cos(linspace(0,2*pi,length(xfs))) ;
ycf = C(2)+R*sin(linspace(0,2*pi,length(xfs))) ;
  6 Comments
Matt J
Matt J on 22 Apr 2021
Let's plot it right now:
load(websave('t','https://www.mathworks.com/matlabcentral/answers/uploaded_files/592700/data.mat'))
scatter(xfs,yfs)
Khoder Makkawi
Khoder Makkawi on 22 Apr 2021
It was the wrong data I saved in the second time sorry again.
These are the right coordinates.
I modified the file.

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Accepted Answer

Matt J
Matt J on 22 Apr 2021
Edited: Matt J on 22 Apr 2021
load(websave('t','https://www.mathworks.com/matlabcentral/answers/uploaded_files/592785/data.mat'))
R = 10; C = [0. 0.] ;
xcf = C(1)+R*cos(linspace(0,2*pi,length(xfs))) ;
ycf = C(2)+R*sin(linspace(0,2*pi,length(xfs))) ;
shpOuter=polyshape(xfs,yfs);
shpInner=polyshape(xcf,ycf);
Warning: Polyshape has duplicate vertices, intersections, or other inconsistencies that may produce inaccurate or unexpected results. Input data has been modified to create a well-defined polyshape.
plot(shpOuter,'FaceColor','none');
hold on
plot(shpInner,'FaceColor','none');
plot(subtract(shpOuter,shpInner))
hold off
  5 Comments
Matt J
Matt J on 22 Apr 2021
No. You should upgrade. There have been lots of important new features added since R2016a.
Khoder Makkawi
Khoder Makkawi on 22 Apr 2021
ok Thank you I will try to upgrade.

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