forked from MTSR/mapserver
46 lines
876 B
Go
46 lines
876 B
Go
package coords
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import (
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"mapserver/layer"
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"math"
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)
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const (
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MAX_ZOOM = 13
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)
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func GetTileCoordsFromMapBlock(mbc MapBlockCoords, layers []layer.Layer) *TileCoords {
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tc := TileCoords{X: mbc.X, Y: (mbc.Z + 1) * -1, Zoom: MAX_ZOOM}
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var layerid *int
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for _, l := range layers {
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if (mbc.Y*16) >= l.From && (mbc.Y*16) <= l.To {
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layerid = &l.Id
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}
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}
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if layerid == nil {
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return nil
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}
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tc.LayerId = *layerid
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return &tc
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}
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func GetMapBlockRangeFromTile(tc *TileCoords, y int) MapBlockRange {
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scaleDiff := float64(MAX_ZOOM - tc.Zoom)
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scale := int(math.Pow(2, scaleDiff))
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mapBlockX1 := tc.X * scale
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mapBlockZ1 := (tc.Y * scale * -1) - 1
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mapBlockX2 := mapBlockX1 + scale - 1
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mapBlockZ2 := (mapBlockZ1 + ((scale - 1) * -1))
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return MapBlockRange{
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Pos1: NewMapBlockCoords(mapBlockX1, y, mapBlockZ1),
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Pos2: NewMapBlockCoords(mapBlockX2, y, mapBlockZ2),
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}
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}
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