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50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
// Copyright (c) 2026 Couchbase, 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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package geov2
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import "github.com/blevesearch/geo/s2"
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// getCellSearchBounds takes a raw uint64 S2 cell ID and returns the
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// minimum and maximum uint64 values defining its absolute spatial range.
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func getCellSearchBounds(cellUint uint64) (min uint64, max uint64) {
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cellID := s2.CellID(cellUint)
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rangeMin := cellID.RangeMin()
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rangeMax := cellID.RangeMax()
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return uint64(rangeMin), uint64(rangeMax)
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}
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// Returns the level of the given S2 cell ID
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func getCellLevel(cell uint64) uint64 {
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return uint64(s2.CellID(cell).Level())
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}
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// Returns the parent cell ID of the given S2 cell ID at the specified level
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func getParentCell(cell uint64, level int) uint64 {
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return uint64(s2.CellID(cell).Parent(level))
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}
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// CalcCellsScore returns the total area of the given S2 cells
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// in level 16 cell units (maxCellLevel in the geo repo's region coverer
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// configuration - see geo/geojson/geojson_v2.go)
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func CalcCellsScore(cells []uint64) uint64 {
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var score uint64
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for _, cell := range cells {
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score += calcScore(0, getCellLevel(cell))
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}
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return score
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}
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