分别利用点、线图元生成锥形螺旋曲线和环形螺旋曲线，要求可以设置点的大小、线可以设置线形和宽度。

锥形螺旋曲线的参数方程为：



环形螺旋曲线的参数方程为：



其中，t为参数且 。a，b和c是常数，比如可取a=2.0，b=3.0，c=18.0。-Respectively use point, line elements generate a conical spiral ring spiral curves and curves, you can set the size of the requested point, you can set the line width and alignment.

Conical spiral curve parameter equation is:

 

     　The swirling circular curve parametric equation is:

 

Wherein, t and a parameter. a, b and c are constants, such as preferably a = 2.0, b = 3.0, c = 18.0.