Set value for elements within a polygon
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Anh Mai
el 7 de Ag. de 2021
Comentada: Anh Mai
el 9 de Ag. de 2021
Hi all,
I am new to Matlab and trying to solve a problem with polygon.
I want to create a random 2-D matrix, let's say 100 by 100 as a domain.
domain=ones(100);
Then by enter the x & y coordinates of the polygon, I would like to draw that polygon and set all the elements inside the polygon to a different value.
xv=[40;50;60;50;40];
yv=[60;50;60;70;60];
plot(xv,yv) %plot the polygon
in=inpolygoon(xq,yq,xv,xv);
domain(in)=2;
I am stuck right here, I dont know how to define xq and yq to complete the inpolygon syntax. Please help :(.
Thank you all.
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Sean de Wolski
el 7 de Ag. de 2021
Something along this line will work too. Note, you may need to deal with x/y v. row/col indexing (swap meshgrid for ndgrid).
domain = ones(100);
[xx,yy] = meshgrid(1:100);
xv=[40;50;60;50;40];
yv=[60;50;60;70;60];
% plot(xv,yv) %plot the polygon
xvec = xx(:);
yvec = yy(:);
in=inpolygon(xx(:),yy(:),xv,yv);
domain(sub2ind([100 100],xvec(in),yvec(in)))=2;
imshow(domain); caxis([0,2])
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