Trying to rotate a shape made with drawpolygon

Kshitij Singh answered . 2024-12-21 00:51:54

Here's a solution that you can tweak to your liking. As demonstrated below, the code creates a red rotatable rectangle around the polygon object. Rotate the red rectangle and double click to confirm. The original polygon will rotate correspondingly.

imshow(ones(1000));


my_vertices = [500 500;400 600;400 700;500 800;600 800;700 700; 700 600];
h = drawpolygon('Position',my_vertices);

manualRotate(h);

function manualRotate(h)

  [xl,yl]=polyshape(h.Position).boundingbox;

  dx=diff(xl); dy=diff(yl); c=[xl(1)+dx/2, yl(1)+dy/2];

  hr = drawrectangle('Position',[xl(1),yl(1), dx, dy],'Rotatable',1,'Color','r'); 
  wait(hr)

  t=hr.RotationAngle;
  R=[cosd(t) -sind(t);sind(t) cosd(t)];

  h.Position=(h.Position-c)*R +c;

  delete(hr);


end

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