RGComputeBoundingBox#

Determines the endpoints of a rectangle in the complex plane that contains the region.

Synopsis#

#include "slepcrg.h" 
PetscErrorCode RGComputeBoundingBox(RG rg,PetscReal *a,PetscReal *b,PetscReal *c,PetscReal *d)

Not Collective

Input Parameter#

  • rg - the region context

Output Parameters#

  • a - left endpoint of the bounding box in the real axis

  • b - right endpoint of the bounding box in the real axis

  • c - bottom endpoint of the bounding box in the imaginary axis

  • d - top endpoint of the bounding box in the imaginary axis

Note#

The bounding box is defined as \([a,b]\times[c,d]\). In regions that are not bounded (e.g., an open interval) or with the complement flag set, it makes no sense to compute a bounding box, so the return values are infinite.

See Also#

RG: Region, RGComputeContour(), RGSetScale(), RGSetComplement()

Level#

intermediate

Location#

src/sys/classes/rg/interface/rgbasic.c

Implementations#

RGComputeBoundingBox_Ellipse() in src/sys/classes/rg/impls/ellipse/rgellipse.c
RGComputeBoundingBox_Interval() in src/sys/classes/rg/impls/interval/rginterval.c
RGComputeBoundingBox_Polygon() in src/sys/classes/rg/impls/polygon/rgpolygon.c
RGComputeBoundingBox_Ring() in src/sys/classes/rg/impls/ring/rgring.c

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