Changed type of tileSize to integer throughout

Minor documentation improvements

lib/src/layer/tile_layer/tile_bounds/tile_bounds.dart

@@ -9,7 +9,7 @@ import 'package:meta/meta.dart';
 abstract class TileBounds {
   /// Reference to the coordinate reference system.
   final Crs crs;
-  final double _tileSize;
+  final int _tileSize;
   final LatLngBounds? _latLngBounds;
 
   /// Constructor that creates an instance of a subclass of [TileBounds]:
@@ -18,7 +18,7 @@ abstract class TileBounds {
   /// [WrappedTileBounds] if the CRS is wrapped.
   factory TileBounds({
     required Crs crs,
-    required double tileSize,
+    required int tileSize,
     LatLngBounds? latLngBounds,
   }) {
     if (crs.infinite && latLngBounds == null) {
@@ -43,7 +43,7 @@ abstract class TileBounds {
   /// parameters.
   bool shouldReplace(
     Crs crs,
-    double tileSize,
+    int tileSize,
     LatLngBounds? latLngBounds,
   ) =>
       crs != this.crs || tileSize != _tileSize || latLngBounds != _latLngBounds;

lib/src/layer/tile_layer/tile_layer.dart

@@ -56,9 +56,13 @@ class TileLayer extends StatefulWidget {
   /// If not `null`, then tiles will pull's WMS protocol requests
   final WMSTileLayerOptions? wmsOptions;
 
-  /// Size for the tile.
-  /// Default is 256
-  late final double tileSize;
+  /// Size in pixels of each tile image
+  ///
+  /// Should be a positive power of 2.
+  ///
+  /// If increasing past 256(px) (default), adjust [zoomOffset] as necessary,
+  /// for example 512px: -1.
+  late final int tileSize;
 
   /// The minimum zoom level down to which this layer will be displayed
   /// (inclusive)
@@ -216,7 +220,7 @@ class TileLayer extends StatefulWidget {
     super.key,
     this.urlTemplate,
     this.fallbackUrl,
-    double tileSize = 256,
+    int tileSize = 256,
     double minZoom = 0,
     double maxZoom = double.infinity,
     int minNativeZoom = 0,
@@ -319,8 +323,7 @@ class TileLayer extends StatefulWidget {
     this.zoomOffset = useSimulatedRetina
         ? (zoomReverse ? zoomOffset - 1.0 : zoomOffset + 1.0)
         : zoomOffset;
-    this.tileSize =
-        useSimulatedRetina ? (tileSize / 2.0).floorToDouble() : tileSize;
+    this.tileSize = useSimulatedRetina ? (tileSize / 2).floor() : tileSize;
   }
 
   @override

lib/src/layer/tile_layer/tile_provider/base_tile_provider.dart

@@ -213,8 +213,9 @@ abstract class TileProvider {
   /// When creating a specialized [TileProvider], prefer overriding URL
   /// generation related methods in the following order:
   ///
-  /// 1. [populateTemplatePlaceholders]
-  /// 2. [generateReplacementMap]
+  /// 1. [TileLayer.additionalOptions] (or [generateReplacementMap] for more
+  /// advanced usage)
+  /// 2. [populateTemplatePlaceholders]
   /// 3. [getTileUrl] and/or [getTileFallbackUrl]
   ///
   /// Note to implementors: it is not safe to assume that at least one of
@@ -224,7 +225,7 @@ abstract class TileProvider {
       populateTemplatePlaceholders(
         options.wmsOptions?.getUrl(
               coordinates,
-              options.tileSize.toInt(),
+              options.tileSize,
               options.resolvedRetinaMode == RetinaMode.simulation,
             ) ??
             options.urlTemplate ??

lib/src/layer/tile_layer/tile_range.dart

@@ -41,7 +41,7 @@ class DiscreteTileRange extends TileRange {
   /// Calculate a [DiscreteTileRange] by using the pixel bounds.
   factory DiscreteTileRange.fromPixelBounds({
     required int zoom,
-    required double tileSize,
+    required int tileSize,
     required Bounds<double> pixelBounds,
   }) {
     final Bounds<int> bounds;

lib/src/layer/tile_layer/tile_range_calculator.dart

@@ -7,7 +7,7 @@ import 'package:meta/meta.dart';
 @immutable
 class TileRangeCalculator {
   /// The tile size in pixels.
-  final double tileSize;
+  final int tileSize;
 
   /// Create a new [TileRangeCalculator] instance.
   const TileRangeCalculator({required this.tileSize});

lib/src/layer/tile_layer/tile_scale_calculator.dart

@@ -6,7 +6,7 @@ class TileScaleCalculator {
   final Crs crs;
 
   /// The size in pixel of tiles.
-  final double tileSize;
+  final int tileSize;
 
   double? _cachedCurrentZoom;
   final Map<int, double> _cache = {};
@@ -18,7 +18,7 @@ class TileScaleCalculator {
   });
 
   /// Returns true to indicate that the TileSizeCache should get replaced.
-  bool shouldReplace(Crs crs, double tileSize) =>
+  bool shouldReplace(Crs crs, int tileSize) =>
       this.crs != crs || this.tileSize != tileSize;
 
   /// Clears the cache if the zoom level does not match the current cached one