67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
// Copyright 2020 Google Inc. All rights reserved.
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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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package s2
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// A RegionUnion represents a union of possibly overlapping regions.
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// It is convenient for computing a covering of a set of regions.
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type RegionUnion []Region
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// CapBound returns a bounding cap for this RegionUnion.
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func (ru RegionUnion) CapBound() Cap { return ru.RectBound().CapBound() }
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// RectBound returns a bounding latitude-longitude rectangle for this RegionUnion.
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func (ru RegionUnion) RectBound() Rect {
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ret := EmptyRect()
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for _, reg := range ru {
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ret = ret.Union(reg.RectBound())
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}
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return ret
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}
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// ContainsCell reports whether the given Cell is contained by this RegionUnion.
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func (ru RegionUnion) ContainsCell(c Cell) bool {
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for _, reg := range ru {
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if reg.ContainsCell(c) {
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return true
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}
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}
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return false
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}
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// IntersectsCell reports whether this RegionUnion intersects the given cell.
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func (ru RegionUnion) IntersectsCell(c Cell) bool {
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for _, reg := range ru {
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if reg.IntersectsCell(c) {
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return true
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}
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}
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return false
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}
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// ContainsPoint reports whether this RegionUnion contains the Point.
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func (ru RegionUnion) ContainsPoint(p Point) bool {
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for _, reg := range ru {
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if reg.ContainsPoint(p) {
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return true
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}
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}
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return false
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}
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// CellUnionBound computes a covering of the RegionUnion.
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func (ru RegionUnion) CellUnionBound() []CellID {
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return ru.CapBound().CellUnionBound()
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}
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