How to plot a rectangle from a single point ?

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Salem
Salem 2021-8-24
评论： Wan Ji 2021-8-24
Is there a way to plot a rectangle from a single point?

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Wan Ji
Wan Ji 2021-8-24
编辑：Wan Ji 2021-8-24
Hi,
Use rectangle function
rectangle('Position',[0,0,2,4]); % [x_left_down_corner, y_left_down_corner, length, width]
Use axis function make it look clear
axis([-1,3,-1,5])
axis equal
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Salem
Salem 2021-8-24
Thank you, I have a point named for ex. 'dot' which has x and y value. Can I recall the name of a point rather than specify in numbers again the position of the rectangle?
Wan Ji
Wan Ji 2021-8-24
It is not enough to have x and y, but still length and width are required.
length = 2;
width = 4;
rectangle('Position',[ex.x, ex.y, length, width]); % [x_left_down_corner, y_left_down_corner, length, width]

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