BezierCurve:evaluate
Evaluate Bézier curve at parameter t. The parameter must be between 0 and 1 (inclusive).

This function can be used to move objects along paths or tween parameters. However it should not be used to render the curve, see BezierCurve:render for that purpose.
x, y = BezierCurve:evaluate( t )
t number Where to evaluate the curve.
x number x coordinate of the curve at parameter t.
y number y coordinate of the curve at parameter t.