Draw circle in a rectangular
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How to draw a Matlab code that draws a red circle with radius 1 at the center of a green square of sides 20. The square borders should be blue.
采纳的回答
s=([0 0 ; 0 1; 1 1; 1 0]-1/2)*20;
t=linspace(0,360,1000)';
c=[cosd(t), sind(t)];
patch('XData',s(:,1),'YData',s(:,2),'FaceColor','g','EdgeColor','b','LineWidth',3);
patch('XData',c(:,1),'YData',c(:,2),'FaceColor','r','LineStyle','none');
axis equal
更多回答（2 个）
c=nsidedpoly(1000);
s=subtract(nsidedpoly(4,'Side',20),c);
h=plot([c,s]); axis equal
h(1).FaceColor='red';
h(1).FaceAlpha=1;
h(2).FaceColor='green';
h(2).EdgeColor='blue';
N=500;
[x,y]=ndgrid(linspace(-10,10,N));
cmsk=x.^2+y.^2>=1;
emsk=padarray(zeros(N-6),[3,3],1);
[R,G,B]=deal(~cmsk&~emsk,cmsk&~emsk,emsk);
I=cat(3,R,G,B);
imshow(I)
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