/* For cartesian coordinate system, enter parametric equation
/* in terms of t (which will vary from 0 to 1) for x, y and z
/* For example: for a circle in x-y plane, centered at origin
/* and radius = 4, the parametric equations will be:
/* x = 4 * cos ( t * 360 )
/* y = 4 * sin ( t * 360 )
/* z = 0
/*-------------------------------------------------------------------
/*椭圆ellipse,旋转时修改x项后面的角度为任意,如(t*360+45,....
x=4*cos(t*360+30)
y=2*sin(t*360)
z=0
by this way:curve ---from equation
catia sketch can do it, any angle no problem,proe have constrains |