mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-09-21 11:00:07 +00:00
98263a7de6
* start fixing up tests * fix up tests + automate with drone * fiddle with linting * messing about with drone.yml * some more fiddling * hmmm * add cache * add vendor directory * verbose * ci updates * update some little things * update sig
71 lines
2.8 KiB
Go
71 lines
2.8 KiB
Go
// Copyright 2014 Google Inc. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package s2
|
|
|
|
// A Region represents a two-dimensional region on the unit sphere.
|
|
//
|
|
// The purpose of this interface is to allow complex regions to be
|
|
// approximated as simpler regions. The interface is restricted to methods
|
|
// that are useful for computing approximations.
|
|
type Region interface {
|
|
// CapBound returns a bounding spherical cap. This is not guaranteed to be exact.
|
|
CapBound() Cap
|
|
|
|
// RectBound returns a bounding latitude-longitude rectangle that contains
|
|
// the region. The bounds are not guaranteed to be tight.
|
|
RectBound() Rect
|
|
|
|
// ContainsCell reports whether the region completely contains the given region.
|
|
// It returns false if containment could not be determined.
|
|
ContainsCell(c Cell) bool
|
|
|
|
// IntersectsCell reports whether the region intersects the given cell or
|
|
// if intersection could not be determined. It returns false if the region
|
|
// does not intersect.
|
|
IntersectsCell(c Cell) bool
|
|
|
|
// ContainsPoint reports whether the region contains the given point or not.
|
|
// The point should be unit length, although some implementations may relax
|
|
// this restriction.
|
|
ContainsPoint(p Point) bool
|
|
|
|
// CellUnionBound returns a small collection of CellIDs whose union covers
|
|
// the region. The cells are not sorted, may have redundancies (such as cells
|
|
// that contain other cells), and may cover much more area than necessary.
|
|
//
|
|
// This method is not intended for direct use by client code. Clients
|
|
// should typically use Covering, which has options to control the size and
|
|
// accuracy of the covering. Alternatively, if you want a fast covering and
|
|
// don't care about accuracy, consider calling FastCovering (which returns a
|
|
// cleaned-up version of the covering computed by this method).
|
|
//
|
|
// CellUnionBound implementations should attempt to return a small
|
|
// covering (ideally 4 cells or fewer) that covers the region and can be
|
|
// computed quickly. The result is used by RegionCoverer as a starting
|
|
// point for further refinement.
|
|
CellUnionBound() []CellID
|
|
}
|
|
|
|
// Enforce Region interface satisfaction.
|
|
var (
|
|
_ Region = Cap{}
|
|
_ Region = Cell{}
|
|
_ Region = (*CellUnion)(nil)
|
|
_ Region = (*Loop)(nil)
|
|
_ Region = Point{}
|
|
_ Region = (*Polygon)(nil)
|
|
_ Region = (*Polyline)(nil)
|
|
_ Region = Rect{}
|
|
)
|