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Get proper cached images from the tile server

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Eli Ribble 2026-04-16 20:51:17 +00:00
parent b3a89d9c68
commit f1890332ae
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2 changed files with 41 additions and 8 deletions
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43
platform/tile.go
View file

@ -6,6 +6,7 @@ import (
"embed"
"fmt"
"io"
"math"
"math/rand"
"net/http"
"os"
@ -30,17 +31,47 @@ var emptyTileFS embed.FS
func GetTile(ctx context.Context, w http.ResponseWriter, org Organization, z, y, x uint) error {
return getTile(ctx, w, org.model, z, y, x)
}
func GetTileLatLng(ctx context.Context, w http.ResponseWriter, org *models.Organization, level uint, lat, lng float64) error {
y, x := LatLngToTile(level, lat, lng)
return getTile(ctx, w, org, level, y, x)
}
func ImageAtPoint(ctx context.Context, org Organization, level uint, lat, lng float64) (*TileRaster, error) {
return imageAtPoint(ctx, org.model, level, lat, lng)
}
func WriteTile(ctx context.Context, w http.ResponseWriter, org *models.Organization, level uint, lat, lng float64) error {
image, err := imageAtPoint(ctx, org, level, lat, lng)
if err != nil {
return fmt.Errorf("image at point: %w", err)
// LatLngToTile converts GPS coordinates to ArcGIS tile coordinates
func LatLngToTile(level uint, lat, lng float64) (row, column uint) {
// Get number of tiles per dimension at this zoom level
numTiles := math.Pow(2, float64(level))
// Convert longitude to tile column
// Range: -180 to 180 degrees maps to 0 to numTiles
column = uint(math.Floor((lng + 180.0) / 360.0 * numTiles))
// Convert latitude to tile row using Mercator projection
// First convert lat to radians
latRad := lat * math.Pi / 180.0
// Apply Mercator projection formula
// This maps latitude from -85.0511 to 85.0511 degrees to 0 to numTiles
mercatorY := 0.5 - math.Log(math.Tan(latRad)+1/math.Cos(latRad))/(2*math.Pi)
row = uint(math.Floor(mercatorY * numTiles))
// Ensure values are within valid range
if column < 0 {
column = 0
} else if column >= uint(numTiles) {
column = uint(numTiles) - 1
}
writeTile(w, image)
return nil
if row < 0 {
row = 0
} else if row >= uint(numTiles) {
row = uint(numTiles) - 1
}
return row, column
}
// Writes a random tile from the cache. This is a very odd thing to do, it's for testing

6
resource/compliance.go
View file

@ -101,9 +101,11 @@ func imagePoolGet(ctx context.Context, w http.ResponseWriter, public_id string)
return fmt.Errorf("no pool feature")
}
level := uint(15)
err = platform.WriteTile(ctx, w, organization, level, pool_feature.Location.Latitude, pool_feature.Location.Longitude)
level := uint(19)
err = platform.GetTileLatLng(ctx, w, organization, level, pool_feature.Location.Latitude, pool_feature.Location.Longitude)
if err != nil {
// Try to get the tile from stadia
return fmt.Errorf("write tile at %d, %f %f: %w", level, pool_feature.Location.Longitude, pool_feature.Location.Latitude, err)
}
w.WriteHeader(http.StatusOK)