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0
forked from MTSR/mapserver
mapserver/coords/tilecoords.go

47 lines
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package coords
import (
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"math"
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)
type TileCoords struct {
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X, Y int
Zoom int
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LayerId int
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}
type TileQuadrants struct {
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UpperLeft, UpperRight, LowerLeft, LowerRight TileCoords
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}
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func NewTileCoords(x, y, zoom int, layerId int) TileCoords {
return TileCoords{X: x, Y: y, Zoom: zoom, LayerId: layerId}
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}
func (tc TileCoords) GetZoomedOutTile() TileCoords {
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return TileCoords{
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X: int(math.Floor(float64(tc.X) / 2.0)),
Y: int(math.Floor(float64(tc.Y) / 2.0)),
Zoom: tc.Zoom - 1,
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LayerId: tc.LayerId}
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}
func (tc TileCoords) GetZoomedQuadrantsFromTile() TileQuadrants {
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nextZoom := tc.Zoom + 1
nextZoomX := tc.X * 2
nextZoomY := tc.Y * 2
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upperLeft := TileCoords{X: nextZoomX, Y: nextZoomY, Zoom: nextZoom, LayerId: tc.LayerId}
upperRight := TileCoords{X: nextZoomX + 1, Y: nextZoomY, Zoom: nextZoom, LayerId: tc.LayerId}
lowerLeft := TileCoords{X: nextZoomX, Y: nextZoomY + 1, Zoom: nextZoom, LayerId: tc.LayerId}
lowerRight := TileCoords{X: nextZoomX + 1, Y: nextZoomY + 1, Zoom: nextZoom, LayerId: tc.LayerId}
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return TileQuadrants{
UpperLeft: upperLeft,
UpperRight: upperRight,
LowerLeft: lowerLeft,
LowerRight: lowerRight,
}
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}