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Function to draw a tilted rectangle
by Sudarshan
Specify width, height and angle of orientation of the rectangle, that is drawn on an image
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| drawRectangleonImageAtAngle(img,center,width, height,angle)
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function hdl = drawRectangleonImageAtAngle(img,center,width, height,angle)
% To draw a rectangle at a given pixel location (center) with any width and
% height rotated at an angle
% Input:
% img - image (gray scale or color)
% center - the pixel location of the center of rectangle 2x1 vector
% width - width of rectangle in pixels
% height - height of rectangle in pixels
% angle - rotation angle of rectangle in degrees
% output:
% hdl = handle to figure
% Sudarshan Ramenahalli, Johns Hopkins University (sudarshan@jhu.edu)
hdl = imshow(img); hold on;
theta = angle*(pi/180);
coords = [center(1)-(width/2) center(1)-(width/2) center(1)+(width/2) center(1)+(width/2);...
center(2)-(height/2) center(2)+(height/2) center(2)+(height/2) center(2)-(height/2)]
R = [cos(theta) sin(theta);...
-sin(theta) cos(theta)];
rot_coords = R*(coords-repmat(center,[1 4]))+repmat(center,[1 4]);
rot_coords(:,5)=rot_coords(:,1);
line(rot_coords(1,:),rot_coords(2,:),'LineWidth',3);
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