Add ChildrenInZoomRange method #133
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@paulmach would you please take a look? |
paulmach
reviewed
Jul 14, 2023
maptile/tile.go
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| @@ -226,6 +226,31 @@ func (t Tile) Children() Tiles { | |||
| } | |||
| } | |||
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| // ChildrenInZoomRange returns all the children tiles of tile from ranges [zoomStart, zoomEnd], both ends inclusive. | |||
| func ChildrenInZoomRange(tile Tile, zoomStart, zoomEnd Zoom) Tiles { | |||
| if zoomStart < tile.Z || zoomEnd < tile.Z { | |||
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I think this should be two checks
if !(zoomStart <= zoomEnd) {
panic("zoomStart must be <= zoomEnd")
}
Then
if !(tile.Z <= zoomStart) {
panic("tile.Z must be <= zoomStart")
}
maptile/tile.go
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| for d := zDeltaStart; d <= zDeltaEnd; d++ { | ||
| xTopLeft := tile.X << d | ||
| yTopLeft := tile.Y << d | ||
| dim := uint32(math.Pow(2, float64(d))) |
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Good point, fixed in next commit.
maptile/tile.go
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| res := make([]Tile, 0) | ||
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| for d := zDeltaStart; d <= zDeltaEnd; d++ { | ||
| xTopLeft := tile.X << d |
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this variable seems more like left or xStart
Then the next one is more like top or yStart
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Add a utility method to generate all children tiles of a tile.