Creating a rectangle with 4 points

Question

Umut Ege Ulucay 2020-5-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/522267-creating-a-rectangle-with-4-points

编辑： Adam Danz 2020-5-4

采纳的回答： Adam Danz

Hello, I have 4 points with (x,y,z) and I want to have a closed shape which connects them.

I actually want to draw 4 lines between the 4 points and make them a rectangle.

Thank you for help.

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Answer 1

Adam Danz 2020-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/522267-creating-a-rectangle-with-4-points#answer_429634

编辑：Adam Danz 2020-5-4

 plot3([2 4 4 2 2],[1 1 5 5 1], [3 3 3 3 3], '-k')   % for (x,y,z)
%  plot([2 4 4 2 2],[1 1 5 5 1], '-k')                 % for (x,y)
 grid on 
 axis equal

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Umut Ege Ulucay 2020-5-2

编辑：Umut Ege Ulucay 2020-5-2

This one works pretty well, thank you.

I want to ask one more question. What if I have couple of rectangles and I want to fill the inside of them according to some values and a colorbar to show the values. Thanks for your help so far.

edit: As I see, I can use fill3 function, am i right?

Adam Danz 2020-5-2

编辑：Adam Danz 2020-5-4

You can check out fill3(). There are examples toward the bottom of that page.

This page also shows you how to do it with patch().

To link the colors of the rectangles to a colobar, you can define a color map which will be a nx3 matrix of RGB values. Assign the colormap to your axes, and then use the rows of the colormap to assign color to each patch. If you get stuck, let me know where I can help.

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Answer 2

Image Analyst 2020-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/522267-creating-a-rectangle-with-4-points#answer_429635

Did you try rectangle()?

rectangle('Position', [x1, y1, x2-x1, y2-y1], 'FaceColor', 'r', 'EdgeColor', 'k');

or using line():

line([x1,x2], [y1, y1], 'Color', 'r', 'LineWidth', 2);
hold on;
line([x1,x2], [y2, y2], 'Color', 'r', 'LineWidth', 2);
line([x1,x1], [y1, y2], 'Color', 'r', 'LineWidth', 2);
line([x2,x2], [y1, y2], 'Color', 'r', 'LineWidth', 2);
hold off;