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52 lines
1.8 KiB
52 lines
1.8 KiB
/*
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* Copyright 2005 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.geometry;
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/**
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* An S2Region represents a two-dimensional region over the unit sphere. It is
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* an abstract interface with various concrete subtypes.
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*
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* The main purpose of this interface is to allow complex regions to be
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* approximated as simpler regions. So rather than having a wide variety of
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* virtual methods that are implemented by all subtypes, the interface is
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* restricted to methods that are useful for computing approximations.
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*
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*
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*/
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public interface S2Region {
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/** Return a bounding spherical cap. */
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public abstract S2Cap getCapBound();
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/** Return a bounding latitude-longitude rectangle. */
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public abstract S2LatLngRect getRectBound();
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/**
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* If this method returns true, the region completely contains the given cell.
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* Otherwise, either the region does not contain the cell or the containment
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* relationship could not be determined.
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*/
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public abstract boolean contains(S2Cell cell);
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/**
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* If this method returns false, the region does not intersect the given cell.
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* Otherwise, either region intersects the cell, or the intersection
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* relationship could not be determined.
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*/
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public abstract boolean mayIntersect(S2Cell cell);
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}
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