How to mirror a plot in x and y axis.

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Matthew
Matthew 2013-4-8
评论： Siddharth Behal 2021-12-17
I want to mirror a plot in x and y axis so i forms a symmetrical shape made of four of the same randomly generated polygon.
prompt = {'Enter Number of vertices:',}
numberOfVertices = str2num(cell2mat(inputdlg(prompt, 'enter a number', 5)))
%numberOfVertices = 7; % Fixed at 7 for this demo.
coordinates = rand(numberOfVertices, 2);
coordinates(1,:) = [0, 0]; % Force first coord to 0,0
coordinates(end+1,:) = [0, 0]; % Force last coord to 0,0
plot(coordinates(:,1), coordinates(:,2));
grid on;
randomColor = rand(1,3);
patch(coordinates(:,1), coordinates(:,2), randomColor); % Can use fill() also.
set(gca, 'xdir', 'reverse');
grid on;

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Yao Li
Yao Li 2013-4-8
编辑：Yao Li 2013-4-8
*mirror both in x axis and y axis
hold on
plot(-coordinates(:,1), -coordinates(:,2));
mirror only in x axis
hold on
plot(coordinates(:,1), -coordinates(:,2));
mirror only in y axis
hold on
plot(-coordinates(:,1), coordinates(:,2));
*
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