sknano.core.geometric_regions.Ellipse

class sknano.core.geometric_regions.Ellipse(center=None, rx=1, ry=1)

Geometric2DRegion for an ellipse.

New in version 0.3.0.

Represents an axis-aligned ellipse centered at $(c_x, c_y)$ with semi-axes lengths $r_x, r_y$.

Parameters:

center : array_like, optional

Center of axis-aligned ellipse with semi-axes lengths $r_x, r_y$

rx, ry : float

Lengths of semi-axes $r_x, r_y$

Notes

Ellipse represents the axis-aligned ellipsoid:

$$\left\{\{x, y, z\}\in R^3| \left(\frac{x-c_x}{r_x}\right)^2 + \left(\frac{y-c_y}{r_y}\right)^2 + \left(\frac{z-c_z}{r_z}\right)^2\le 1\right\}$$

Calling Ellipse with no parameters is equivalent to Ellipse(center=[0, 0], rx=1, ry=1).

Attributes

area	Ellipse area, $A=\pi r_x r_y$.
center	Ellipse center point $(c_x, c_y)$.
centroid	Alias for center.
fmtstr	Format string.
measure	Alias for area, which is the measure of a 2D geometric region.
rx	Length of semi-axis $r_x$.
ry	Length of semi-axis $r_y$.

Methods

center_centroid()	Center centroid on origin.
contains(point)	Test region membership of point in Ellipse.
rotate([angle, axis, anchor_point, ...])	Rotate GeometricRegion points and vectors.
todict()	Returns a dict of the Ellipse constructor parameters.
translate(t[, fix_anchor_points])	Translate GeometricRegion points and vectors by Vector t.