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Summary:
Definition of affinity in a plane and its properties. Ellipse as an image of a circle in different types of affinity in a plane. The cross-piece construction of an ellipse and its relationship to the parallelogram method. Construction of an ellipse based on affinity between a circle and an ellipse which is different from the cross-piece construction. The draftman's method and the trammel method of ellipse construction and their relationship.
References:
[1] Urban, A.: Deskriptivní geometrie I. (1965). Praha: SNTL.
[2] Piska, R., Medek, V.: Deskriptivní geometrie I. (1966). Praha: SNTL.
[3] Kraemer, E.: Zobrazovací metody (promítání rovnoběžné) I. díl. (1991) Praha: SPN. ISBN 80-04-21778-8.
[4] Borecká, K.: Konstruktivní geometrie. et al. (2002). Brno: Akademické nakladatelství CERM, s.r.o. ISBN 80-214-2205-X.
[5] Wikipedia.org: http://en.wikipedia.org/wiki/Ellipse</b>
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