mpl_toolkits.axisartist.floating_axes.ExtremeFinderFixed

class mpl_toolkits.axisartist.floating_axes.ExtremeFinderFixed(extremes)

Bases: ExtremeFinderSimple

This subclass always returns the same bounding box.

Parameters:

extremes(float, float, float, float)

The bounding box that this helper always returns.

__call__(transform_xy, x1, y1, x2, y2)

Compute an approximation of the bounding box obtained by applying transform_xy to the box delimited by (x1, y1, x2, y2).

The intended use is to have (x1, y1, x2, y2) in axes coordinates, and have transform_xy be the transform from axes coordinates to data coordinates; this method then returns the range of data coordinates that span the actual axes.

The computation is done by sampling nx * ny equispaced points in the (x1, y1, x2, y2) box and finding the resulting points with extremal coordinates; then adding some padding to take into account the finite sampling.

As each sampling step covers a relative range of 1/nx or 1/ny, the padding is computed by expanding the span covered by the extremal coordinates by these fractions.