To draw a rotated rectangle in MATLAB, the built-in ‘rectangle’ function is not suitable, as it only supports axis-aligned rectangles. Instead, the rectangle can be manually constructed by calculating the coordinates of its four corners after rotation and then using the ‘fill’ or ‘patch’ function to render it.
Below is a sample code snippet that demonstrates this approach:
x = 227; y = 360; w = 105; h = 65;
corners = [x, y; x+w, y; x+w, y+h; x, y+h]';
corners_centered = corners - [cx; cy];
R = [cosd(theta) -sind(theta); sind(theta) cosd(theta)];
rotated_corners = R * corners_centered + [cx; cy];
h = fill(rotated_corners(1,:), rotated_corners(2,:), 'r');
set(h, 'FaceColor', 'none', 'EdgeColor', 'r', 'LineWidth', 2);
Above code calculates the corners of a rectangle based on its position and size, then rotates it around its center using a rotation matrix. After applying the transformation, it uses the “fill” function to draw the rotated rectangle with a red border and no fill color. This approach allows for flexible visualization of rectangles at any orientation.
For more information, refer to the following documentations:
