30 lines
595 B
Go
30 lines
595 B
Go
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package cache
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import (
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"goposm/binary"
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"goposm/element"
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)
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func packNodes(nodes []element.Node) *DeltaCoords {
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var lastLon, lastLat int64
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var lon, lat int64
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var lastId, id int64
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ids := make([]int64, len(nodes))
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lons := make([]int64, len(nodes))
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lats := make([]int64, len(nodes))
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for i, nd := range nodes {
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id = nd.Id
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lon = int64(binary.CoordToInt(nd.Long))
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lat = int64(binary.CoordToInt(nd.Lat))
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ids[i] = id - lastId
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lons[i] = lon - lastLon
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lats[i] = lat - lastLat
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lastId = id
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lastLon = lon
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lastLat = lat
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}
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return &DeltaCoords{Ids: ids, Lats: lats, Lons: lons}
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}
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