Tangent and normal to an ellipse.
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Description: Geometry application, concerning ellipses. The program determines and draws the tangent and the normal to an ellipse,
described in its standard form, at a given point (entered as point coordinates or in parametric form), as well as the two tangents and the two normals with a
slope entered by the user. A trackbar may be used to reduce or enlarge the drawing. This allows proper drawings for a large range of the ellipse's semi-axes
values (if these are to big or to small, nothing will be drawn or the graph will not be readable...).
Free Pascal features: Radiobuttons and radiogroups. Drawing mathematical curves, using bitmap canvas. Scaling canvas drawings. Usage
of trackbars.
Screenshot:
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