generate coordinates circle,square,rectangle

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Tomas
Tomas 2014-2-28
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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采纳的回答

Image Analyst
Image Analyst 2014-3-2
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.

更多回答（1 个）

Giorgos Papakonstantinou
% 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
  1 个评论
Will Reeves
Will Reeves 2018-4-6
编辑：Will Reeves 2018-4-6
nice... although the "r*" shouldn't apply to the centre coordinate offset:
m=r*[cos(theta') sin(theta')] + C; % the points you asked
instead of this:
m=r*[cos(theta')+C(1) sin(theta')+C(2)]; % the points you asked
Or am I being silly?!

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