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Shapes
<rect> draws a rectangle......OCGPS
......transform
......x="<coord.>": the xcoord. of the upper-left corner
......y="<coord.>":the ycoord. of the upper-left corner
......width="<length>": the width
......height="<length>": the height
......rx="<length>": the xradius of the corner roundness
......ry="<length>": the y radius of the corner roundness
<circle> draws a circle......OCGPS
......transform
......cx="<coord.>": the x coord. of the center
......cy="<coord.>": the y coord. of the center
......r="<length>": the radius
<ellipse> draws an ellipse......OCGPS
......transform
......cx="<coord.>": the x coord. of the center
......cy="<coord.>": the y coord. of the center
......rx="<length>": the x radius
......ry="<length>": the y radius
<polygon> draws a polygon......OCGPS
......transform
......points="<x1,y1 x2,y2......>": the corner points