generate coordinates circle,square,rectangle

Question

Tomas 2014-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/119597-generate-coordinates-circle-square-rectangle

编辑： Will Reeves 2018-4-6

Hello,

I have to generate points(matrix),so that i have view the points as a circle(square,rectagle), when i display points(matrix) through plot.

Could someone help me?

Thanks.

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Answer 1

Image Analyst 2014-3-2

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在 MATLAB Online 中打开

For circle and ellipse, see the FAQ for code examples: http://matlab.wikia.com/wiki/FAQ?title=FAQ&cb=7341#How_do_I_create_a_circle.3F

For a square or rectangle, if you have x1, x2, y1, and y2, you can make it with plot by making coordinates of the box and calling plot

xBox = [x1 x2 x2 x1 x1];
yBox = [y1 y1 y2 y2 y1];
plot(xBox, yBox, 'r-', 'LineWidth', 2);

Of course that can ge generalized to any polygon, just list all the vertices.

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Answer 2

Giorgos Papakonstantinou 2014-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/119597-generate-coordinates-circle-square-rectangle#answer_126757

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% circle
r=1; % radius
C=[1 1];
theta=0:2*pi/360:2*pi; % the angle
m=r*[cos(theta')+C(1) sin(theta')+C(2)]; % the points you asked
plot(m(:,1), m(:,2))
axis equal
hold all
% Rectangle
a=1; % side a
b=.5; % side b
s=[0.5 0.75]; % bottom left start point
A=[s(1) s(1)+a s(1)+a s(1) s(1);s(2) s(2) s(2)+b s(2)+b s(2)];
plot(A(1,:), A(2,:))
axis equal