H = 0.6
Rb = 1.4
S = (H / (2*PI)) * ( (t * 360 * PI / 180 ) - sin (t * 360))
V = ((2* H) / PI ) * (1 - cos ( t * 360))
x = (Rb + S) * sin (t * 90) + V * cos (t * 90)
y = (Rb + S) * cos (t * 90) - V * sin (t * 90)
z = 0
curve 2:
H = 0.6
Rb = 1.4
S = H
V = 0
x = (Rb + S) * sin (90 + t * 60) + V * cos (90 + t * 60)
y = (Rb + S) * cos (90 + t * 60) - V * sin (90 + t * 60)
z = 0
curve 3:
H = 0.6
Rb = 1.4
S = H - (H / (2*PI)) * ( (t * 360 * PI / 180 ) - sin (t * 360))
V = -((2* H) / PI ) * (1 - cos ( t * 360))
x = (Rb + S) * sin (150 + t * 90) + V * cos (150 + t * 90)
y = (Rb + S) * cos (150 + t * 90) - V * sin (150 + t * 90)
z = 0
curve 4:
H = 0.6
Rb = 1.4
S = 0
V = 0
x = (Rb + S) * sin (240 + t * 120) + V * cos (240 + t * 120)
y = (Rb + S) * cos (240 + t * 120) - V * sin (240 + t * 120)
z = 0