136
4 Geometry standards
Fig. 4.7. GM_ArcStringByBulge
A conic (class GM _ Conic) may be an ellipse, a parabola, or a hyperbola depending on the parameter eccentricity. The given formula represents a conic in polar coordinates. The diagram shows foUf cases of different eccentricity.
E > 1
E=1
Fig. 4.8. GM_Conic (Nitschke 2003)
Polar coordinates: (p,q» with p = P / CI + E * COS q»
P=l
Eccentricity: E=O (circle), O1 (hyperbola)
4 Geometry standards
Fig. 4.7. GM_ArcStringByBulge
A conic (class GM _ Conic) may be an ellipse, a parabola, or a hyperbola depending on the parameter eccentricity. The given formula represents a conic in polar coordinates. The diagram shows foUf cases of different eccentricity.
E > 1
E=1
Fig. 4.8. GM_Conic (Nitschke 2003)
Polar coordinates: (p,q» with p = P / CI + E * COS q»
P=l
Eccentricity: E=O (circle), O