c++ - OpenGl rendering issue -

c++ - OpenGl rendering issue -

i have been working on project , stuck @ 1 point. task drawing bezier curve using b-spline command points. had command points bezier curve , used glmap1 draw final curve. interesting part these b-spline points movable move bezier should move accordingly seems when moving b-spline points curve not acting accordingly.

blue 1 b-spline command points........ here bezier curve , command points

my problem here when moving b-spline points

please guide me this. in cases problem might have occur ? thanks! on first question please discard mistakes.

c++ opengl graphics bezier curve