Allowed shapes

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Rectangular box; the two coordinates are two opposite corners:

box[[x1, y1], [x2, y2]]
Center box; [x, y] define the center point of the box and [x_width, y_width] the width of the sides:

centerbox[[x, y], [x_width, y_width]]
Rotated box; [x, y] define the center point of the box; [x_width, y_width] the width of the sides; rotang the rotation angle:

rotbox[[x, y], [x_width, y_width], rotang]
Polygon; there could be many [x, y] corners; note that the last point will connect with the first point to close the polygon:

poly[[x1, y1], [x2, y2], [x3, y3], ...]
Circle; center of the circle [x,y], r is the radius:

circle[[x, y], r]
Annulus; center of the circle is [x, y], [r1, r2] are inner and outer radii:

annulus[[x, y], [r1, r2]]
Ellipse; center of the ellipse is [x, y]; semi-major and semi-minor axes are [bmaj, bmin]; position angle of the major axis is pa:

ellipse[[x, y], [bmaj, bmin], pa]

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