added stitching

2026-04-22 09:06:38 +00:00 · 2025-10-29 11:21:59 +01:00
parent bbb112940d
commit 72eea71507
4 changed files with 179 additions and 48 deletions
@@ -144,5 +144,71 @@ public class GoogleMapsDownloaderV2
        var metersPerPixel = (EARTH_CIRCUMFERENCE_METERS * Math.Cos(latRad)) / (Math.Pow(2, zoomLevel) * TILE_SIZE_PIXELS);
        return metersPerPixel * TILE_SIZE_PIXELS;
    }
+
+    public async Task<List<DownloadedTileInfoV2>> GetTilesWithMetadataAsync(GeoPoint centerGeoPoint, double radiusM, int zoomLevel, CancellationToken token = default)
+    {
+        if (!ALLOWED_ZOOM_LEVELS.Contains(zoomLevel))
+        {
+            throw new ArgumentException($"Zoom level {zoomLevel} is not allowed. Allowed zoom levels are: {string.Join(", ", ALLOWED_ZOOM_LEVELS)}", nameof(zoomLevel));
+        }
+
+        var (latMin, latMax, lonMin, lonMax) = GeoUtils.GetBoundingBox(centerGeoPoint, radiusM);
+
+        var (xMin, yMin) = GeoUtils.WorldToTilePos(new GeoPoint(latMax, lonMin), zoomLevel);
+        var (xMax, yMax) = GeoUtils.WorldToTilePos(new GeoPoint(latMin, lonMax), zoomLevel);
+
+        _logger.LogInformation("Downloading tiles for region: center=({Lat}, {Lon}), radius={Radius}m, zoom={Zoom}", 
+            centerGeoPoint.Lat, centerGeoPoint.Lon, radiusM, zoomLevel);
+        _logger.LogInformation("Tile range: X=[{XMin}, {XMax}], Y=[{YMin}, {YMax}]", xMin, xMax, yMin, yMax);
+
+        var sessionToken = await GetSessionToken();
+        var downloadedTiles = new List<DownloadedTileInfoV2>();
+
+        for (var y = yMin; y <= yMax; y++)
+        {
+            for (var x = xMin; x <= xMax; x++)
+            {
+                token.ThrowIfCancellationRequested();
+
+                var tileCenter = GeoUtils.TileToWorldPos(x, y, zoomLevel);
+                var tileSizeMeters = CalculateTileSizeInMeters(zoomLevel, tileCenter.Lat);
+
+                var server = (x + y) % 4;
+                var url = string.Format(TILE_URL_TEMPLATE, server, x, y, zoomLevel, sessionToken);
+
+                Directory.CreateDirectory(_tilesDirectory);
+
+                var timestamp = DateTime.UtcNow.ToString("yyyyMMddHHmmss");
+                var fileName = $"tile_{zoomLevel}_{x}_{y}_{timestamp}.jpg";
+                var filePath = Path.Combine(_tilesDirectory, fileName);
+
+                try
+                {
+                    using var httpClient = _httpClientFactory.CreateClient();
+                    httpClient.DefaultRequestHeaders.UserAgent.ParseAdd(USER_AGENT);
+
+                    var response = await httpClient.GetAsync(url, token);
+                    response.EnsureSuccessStatusCode();
+
+                    var imageBytes = await response.Content.ReadAsByteArrayAsync(token);
+                    await File.WriteAllBytesAsync(filePath, imageBytes, token);
+
+                    _logger.LogInformation("Downloaded tile ({X}, {Y}) to {FilePath}, center=({Lat:F6}, {Lon:F6}), size={Size:F2}m", 
+                        x, y, filePath, tileCenter.Lat, tileCenter.Lon, tileSizeMeters);
+
+                    downloadedTiles.Add(new DownloadedTileInfoV2(
+                        x, y, zoomLevel, tileCenter.Lat, tileCenter.Lon, filePath, tileSizeMeters));
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, "Failed to download tile ({X}, {Y})", x, y);
+                    throw;
+                }
+            }
+        }
+
+        _logger.LogInformation("Downloaded {Count} tiles for region", downloadedTiles.Count);
+        return downloadedTiles;
+    }
 }