default http://www.smart.net/~phchen/examples/ccsexpr0.htm
rect    http://www.smart.net/~phchen/examples/ccsexpr1.htm 30,5 170,100
rect    http://www.smart.net/~phchen/examples/ccsexpr2.htm 220,55 270,100
rect    http://www.smart.net/~phchen/examples/ccsexpr3.htm 5,155 30,190
circle  http://www.smart.net/~phchen/examples/ccsexpr5.htm 80,200 80,150
circle  http://www.smart.net/~phchen/examples/ccsexpr6.htm 270,200 270,155
rect    http://www.smart.net/~phchen/examples/ccsexpr4.htm 30,100 320,200
poly    http://www.smart.net/~phchen/examples/ccsexpr7.htm 320,150 320,250 420,250