How to color the area bounded by several circles?

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JoLin
JoLin 2020-9-16
评论： JoLin 2020-9-17
Hello all,
I have drawn 3 half-circles (Mohr circles) and wanting to shade the area bounded by them as indicated in the attached picture. This is my code for creating these half-circles:
theta = 0:1/1000*pi:pi;
R1 = (SHmax-Shmin)/2; %first mohr circle
C1 = Shmin+R1;
x1 = cos(theta)*R1+C1;
y1 = sin(theta)*R1;
R2 = (Sv-Shmin)/2; %second mohr circle
C2 = Shmin+R2;
x2 = cos(theta)*R2+C2;
y2 = sin(theta)*R2;
R3 = (SHmax-Sv)/2; %third mohr circle
C3 = Sv+R3;
x3 = cos(theta)*R3+C3;
y3 = sin(theta)*R3;
figure (1)
hold on
plot(x1,y1)
plot(x2,y2)
plot(x3,y3)
I have tried using fill() and patch() but am new to programming and could not figure out how to correctly use them. Can someone please help me out? Thank you very much!!

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Walter Roberson
Walter Roberson 2020-9-17
Fx= [x1,fliplr(x2),fliplr(x3)];
Fy = [y1,fliplr(y2),fliplr(y3)];
fill(Fx, Fy);
Tested with input values I made up. For your input values, it is possible that you might need to flip or not flip different arrays.
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Walter Roberson
Walter Roberson 2020-9-17
fill() is actually a patch() and patch() can do that if you set the correct properties.
However by that point you might as well go ahead and use patch() directly.
JoLin
JoLin 2020-9-17
Ok I see, will give it a try, thanks alot for the help!

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