The rotation in the rectangle function in matlab cannot be used, but the 2022 version can be used.

rectangle('Position',[1 2 5 6],'Rotation',45);

axis([0 10 0 10]);

Answer 1

[Steven Lord]

try
    rectangle('Position',[1 2 5 6],'Rotation',45);
catch ME
    fprintf("This command threw the following error:\n%s", ME.message)
end

This command threw the following error:
Unrecognized property Rotation for class Rectangle.

The word Rotation does not appear at all on the documentation page listing the properties for the object created by the rectangle function.

You could create a rectangle and call rotate on it.

There is an object in Image Processing Toolbox, images.roi.Rectangle, that has rotation-related properties. Did you meant to create one of those?

obj = images.roi.Rectangle('Position',[1 2 5 6],'Rotation',45)

obj = 
  Rectangle with properties:

         Position: [1 2 5 6]
    RotationAngle: 45
      AspectRatio: 1.2000
            Label: ''

  Use GET to show all properties

Or you could create a polyshape object and call its rotate method.

There are a number of other functions that show up when I search the documentation for "rectangle rotation" -- if you meant to use one of those please clarify which type of object you're trying to use and we may be able to suggest the right approach (or tell you that what you're trying to do isn't supported.)

[道夫]

thank you

[道夫]

I want to try to achieve this effect

[道夫]

I want the rotated rectangles to be arranged periodically, but with the above code I don’t know how to loop and arrange the rectangles at different positions.

[DGM]

The rotate() function does not work on rectangle objects.

hr = rectangle('Position',[1 2 5 6]);
rotate(hr,[0 0 1],45) % does nothing
axis equal

You can use hgtransform on rectangle objects:

% initial rectangle parameters
rsize = [5 7]; % [w h]
center = [3.5 5]; % [x y]

% cycle parameters
offset = [8 0]; % [x y]
anglerange = [0 90]; 
nsteps = 7;

% draw a sequence of rectangles
angles = linspace(anglerange(1),anglerange(2),nsteps);
g = gobjects(nsteps,1);
hr = gobjects(nsteps,1);
for k = 1:nsteps
    g(k) = hgtransform;
    hr(k) = rectangle('Position',[-rsize/2 rsize],'parent',g(k),'facecolor','r');
    Mrot = makehgtform('zrotate',deg2rad(angles(k)));
    Mtrans = makehgtform('translate',[(center + (k-1)*offset) 0]);
    g(k).Matrix = Mtrans*Mrot;
    hold on
end
axis equal

... or you can use rotate() on patch() objects (or polyshapes)

% initial rectangle parameters
rsize = [5 7]; % [w h]
center = [3.5 5]; % [x y]

% cycle parameters
offset = [8 0]; % [x y]
anglerange = [0 90]; 
nsteps = 7;

% draw a sequence of rectangles
angles = linspace(anglerange(1),anglerange(2),nsteps);
hr = gobjects(nsteps,1);
for k = 1:nsteps
    thisc = center + (k-1)*offset;
    vx = thisc(1) + [-1 1 1 -1]*rsize(1)/2;
    vy = thisc(2) + [-1 -1 1 1]*rsize(2)/2;
    hr(k) = patch(vx,vy,'r');
    rotate(hr(k),[0 0 1],angles(k),[thisc 0]);
    hold on
end
axis equal

See also:

https://blogs.mathworks.com/graphics/2015/09/28/homogeneous-coordinates/

[道夫]

thank you very much