# bspline_udp_1
# written by John Dannenhoffer

DESPMTR   dy        0.3

# make NACA airfoil
UDPRIM    naca      series 0012

# extract the knot vector and control points
EVALUATE  EDGEKT    @nbody       1
DIMENSION edgekt    @edata.size  1
SET       edgekt    @edata

EVALUATE  EDGECP    @nbody       1
DIMENSION edgecp    @edata.size  1
SET       edgecp    @edata

# translate the y control points
PATBEG    i         edgecp.size/3
   SET    edgecp[3*i-1]  edgecp[3*i-1]+dy
PATEND

# create a bspline curve with those knots and control points
UDPARG    bspline   uknots   edgekt
UDPARG    bspline   cps      edgecp
UDPRIM    bspline

END