(octave.info)Two-dimensional Geometric Shapes

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15.2.1.3 Two-dimensional Geometric Shapes
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 -- : rectangle ()
 -- : rectangle (..., "Position", POS)
 -- : rectangle (..., "Curvature", CURV)
 -- : rectangle (..., "EdgeColor", EC)
 -- : rectangle (..., "FaceColor", FC)
 -- : rectangle (HAX, ...)
 -- : H = rectangle (...)
     Draw a rectangular patch defined by POS and CURV.

     The variable ‘POS(1:2)’ defines the lower left-hand corner of the
     patch and ‘POS(3:4)’ defines its width and height.  By default, the
     value of POS is ‘[0, 0, 1, 1]’.

     The variable CURV defines the curvature of the sides of the
     rectangle and may be a scalar or two-element vector with values
     between 0 and 1.  A value of 0 represents no curvature of the side,
     whereas a value of 1 means that the side is entirely curved into
     the arc of a circle.  If CURV is a two-element vector, then the
     first element is the curvature along the x-axis of the patch and
     the second along y-axis.

     If CURV is a scalar, it represents the curvature of the shorter of
     the two sides of the rectangle and the curvature of the other side
     is defined by

          min (pos(1:2)) / max (pos(1:2)) * curv

     Additional property/value pairs are passed to the underlying patch
     command.

     If the first argument HAX is an axes handle, then plot into this
     axes, rather than the current axes returned by ‘gca’.

     The optional return value H is a graphics handle to the created
     rectangle object.

     See also: Note: patch, Note: line, Note:
     cylinder, Note: ellipsoid, Note:
     sphere.