Parabola drawing linkage 1
Move the green bar to trace the red parabola.
Equation of the parabola in coordinate system xOy:
y = (x*x)/b
b is the distance from O to the stationary guide line for the green bar.
F is the parabola focus.
OF = b/4
Line D is the directrix of the parabola.
MK is the distance from K to the directrix D.
MF = MK (the geometrical definition of a parabola).
Inventor files of this video:
http://www.mediafire.com/file/jsz0fks...