color area between two shapes

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Khoder Makkawi 2021-4-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/809345-color-area-between-two-shapes

评论： Khoder Makkawi 2021-4-22

采纳的回答： Matt J

data.mat

在 MATLAB Online 中打开

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))) ;

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Matt J 2021-4-22

在 MATLAB Online 中打开

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 2021-4-22

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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采纳的回答

Matt J 2021-4-22

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/809345-color-area-between-two-shapes#answer_681655

编辑：Matt J 2021-4-22

在 MATLAB Online 中打开

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