Node:Querying Ellipses, Next:Returning Elements and Information for Ellipses, Previous:Affine Transformations for Ellipses, Up:Ellipse Reference
bool is_elliptical (void) | const function |
Returns true if the Ellipse is elliptical, otherwise
false .
Certain transformations, such as shearing and scaling, can cause
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bool is_quadratic (void )
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Inline const function |
Returns true , because the equation
for an ellipse in the x-y plane with its center at the
origin is the quadratic equation
x^2/a^2 + y^2/b^2 = 1
where a is half the horizontal axis
and b is half the vertical axis.
Ellipse e(origin, 5, 2, 90); e.draw(); Point P(e.angle_point(-35)); cout << ((P.get_x() * P.get_x()) / (e.get_axis_h()/2 * e.get_axis_h()/2)) + ((P.get_y() * P.get_y()) / (e.get_axis_v()/2 * e.get_axis_v()/2)); -| 1
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bool is_cubic (void )
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const virtual functions |
bool is_quartic (void )
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These functions both return false , because the equation of an
ellipse is neither a cubic nor a quartic function.
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