Functions Index :: P :: Parabola
Parabola(float x, float a, bool "up_part", float "xc", float "yc")
Returns the y-value of x so that the point (x,y) lies on a parabola parallel to x axis, with edge located at distance a from its focus and its center located at (xc,yc).
If xc or yc are not provided they default to zero.
up_part determines whether the point will be on the upper or lower part of the curve. If up_part is true or omitted it will on the upper part (ie >= yc), else on the lower (ie < yc).
Notes and conditions on arguments relations:
1] If x >= xc the function returns the y-value that corresponds to a parabola opening towards the right x semi-axis; else the y-value that corresponds to a parabola opening towards the left x semi-axis.
2] Exchange x,y to get a hyperbola with axis parallel to y axis.
TODO in a later version of AVSLib.