MATLAB: Drawing an arc between two elements

circledrawlinesMATLABplotplotting

I want to draw an arc (given its centre and its radius) between two elements.
For example the case given in the image below. I would like to draw an arc (of radius 0.5 (as an example) and the centre de point P drawed) strictly between those two lines
What is the general case of doing it? I mean, in this particular case there are two lines, but I would like a method that would work for whatever elements between I'd want to draw an arc (between a circle and a line, between two circles…etc).

Best Answer

L1=[1 3;
1 6]
L2=[-2 2;
8 -1]
P=InterX(L1,L2);
L = [L2(:,1) P L1(:,2)] ;
p = polyfit(L(1,:),L(2,:),2) ;
xi = linspace(min(L(1,:)),max(L(1,:))) ;
yi = polyval(p,xi) ;
figure
hold on
plot(L1(1,:),L1(2,:),'r')
plot(L2(1,:),L2(2,:),'b')
plot(P(1),P(2),'ro')
plot(xi,yi,'k')
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