diff --git a/analysis_options.yaml b/analysis_options.yaml
index b60ac5b8..ae848fce 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -20,6 +20,7 @@
 
 analyzer:
   strong-mode:
+    implicit-casts: false
     implicit-dynamic: false
   errors:
     # treat missing required parameters as a warning (not a hint)
@@ -43,7 +44,7 @@ linter:
     - always_specify_types
     - annotate_overrides
     # - avoid_annotating_with_dynamic # conflicts with always_specify_types
-    - avoid_as
+    # - avoid_as # conflicts with implicit-casts: false
     # - avoid_bool_literals_in_conditional_expressions # not yet tested
     # - avoid_catches_without_on_clauses # we do this commonly
     # - avoid_catching_errors # we do this commonly
diff --git a/lib/avd.dart b/lib/avd.dart
index 068b2e16..dbc32d50 100644
--- a/lib/avd.dart
+++ b/lib/avd.dart
@@ -21,7 +21,7 @@ final Avd avd = Avd._();
 class Avd {
   Avd._();
 
-  FutureOr<PictureInfo> avdPictureDecoder(
+  Future<PictureInfo> avdPictureDecoder(
       Uint8List raw,
       bool allowDrawingOutsideOfViewBox,
       ColorFilter colorFilter,
@@ -33,7 +33,7 @@ class Avd {
     return PictureInfo(picture: pic, viewport: avdRoot.viewport.viewBoxRect);
   }
 
-  FutureOr<PictureInfo> avdPictureStringDecoder(
+  Future<PictureInfo> avdPictureStringDecoder(
     String raw,
     bool allowDrawingOutsideOfViewBox,
     ColorFilter colorFilter,
@@ -49,7 +49,7 @@ class Avd {
     );
   }
 
-  FutureOr<DrawableRoot> fromAvdBytes(Uint8List raw, String key) async {
+  Future<DrawableRoot> fromAvdBytes(Uint8List raw, String key) async {
     // TODO(dnfield): do utf decoding in another thread?
     // Might just have to live with potentially slow(ish) decoding, this is causing errors.
     // See: https://github.com/dart-lang/sdk/issues/31954
diff --git a/lib/src/picture_provider.dart b/lib/src/picture_provider.dart
index 20d2e626..853d95a7 100644
--- a/lib/src/picture_provider.dart
+++ b/lib/src/picture_provider.dart
@@ -87,7 +87,7 @@ class PictureConfiguration {
     Locale locale,
     TextDirection textDirection,
     Rect viewBox,
-    String platform,
+    TargetPlatform platform,
     ColorFilter colorFilter,
   }) {
     return PictureConfiguration(
@@ -132,13 +132,13 @@ class PictureConfiguration {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final PictureConfiguration typedOther = other;
-    return typedOther.bundle == bundle &&
-        typedOther.locale == locale &&
-        typedOther.textDirection == textDirection &&
-        typedOther.viewBox == viewBox &&
-        typedOther.platform == platform &&
-        typedOther.colorFilter == colorFilter;
+    return other is PictureConfiguration &&
+        other.bundle == bundle &&
+        other.locale == locale &&
+        other.textDirection == textDirection &&
+        other.viewBox == viewBox &&
+        other.platform == platform &&
+        other.colorFilter == colorFilter;
   }
 
   @override
@@ -399,10 +399,10 @@ class AssetBundlePictureKey {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final AssetBundlePictureKey typedOther = other;
-    return bundle == typedOther.bundle &&
-        name == typedOther.name &&
-        colorFilter == typedOther.colorFilter;
+    return other is AssetBundlePictureKey &&
+        bundle == other.bundle &&
+        name == other.name &&
+        colorFilter == other.colorFilter;
   }
 
   @override
@@ -516,8 +516,9 @@ class NetworkPicture extends PictureProvider<NetworkPicture> {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final NetworkPicture typedOther = other;
-    return url == typedOther.url && colorFilter == typedOther.colorFilter;
+    return other is NetworkPicture &&
+        url == other.url &&
+        colorFilter == other.colorFilter;
   }
 
   @override
@@ -583,9 +584,9 @@ class FilePicture extends PictureProvider<FilePicture> {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final FilePicture typedOther = other;
-    return file?.path == typedOther.file?.path &&
-        typedOther.colorFilter == colorFilter;
+    return other is FilePicture &&
+        file?.path == other.file?.path &&
+        other.colorFilter == colorFilter;
   }
 
   @override
@@ -649,8 +650,9 @@ class MemoryPicture extends PictureProvider<MemoryPicture> {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final MemoryPicture typedOther = other;
-    return bytes == typedOther.bytes && colorFilter == typedOther.colorFilter;
+    return other is MemoryPicture &&
+        bytes == other.bytes &&
+        colorFilter == other.colorFilter;
   }
 
   @override
@@ -715,8 +717,9 @@ class StringPicture extends PictureProvider<StringPicture> {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final StringPicture typedOther = other;
-    return string == typedOther.string && colorFilter == typedOther.colorFilter;
+    return other is StringPicture &&
+        string == other.string &&
+        colorFilter == other.colorFilter;
   }
 
   @override
@@ -858,10 +861,10 @@ class ExactAssetPicture extends AssetBundlePictureProvider {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final ExactAssetPicture typedOther = other;
-    return keyName == typedOther.keyName &&
-        bundle == typedOther.bundle &&
-        colorFilter == typedOther.colorFilter;
+    return other is ExactAssetPicture &&
+        keyName == other.keyName &&
+        bundle == other.bundle &&
+        colorFilter == other.colorFilter;
   }
 
   @override
diff --git a/lib/src/picture_stream.dart b/lib/src/picture_stream.dart
index 7dffdbcb..b580b533 100644
--- a/lib/src/picture_stream.dart
+++ b/lib/src/picture_stream.dart
@@ -50,10 +50,10 @@ class PictureInfo {
     if (other.runtimeType != runtimeType) {
       return false;
     }
-    final PictureInfo typedOther = other;
-    return typedOther.picture == picture &&
-        typedOther.viewport == viewport &&
-        typedOther.size == size;
+    return other is PictureInfo &&
+        other.picture == picture &&
+        other.viewport == viewport &&
+        other.size == size;
   }
 }
 
@@ -253,7 +253,7 @@ abstract class PictureStreamCompleter extends Diagnosticable {
       DiagnosticsNode context, dynamic exception, dynamic stack) {
     FlutterError.reportError(FlutterErrorDetails(
       exception: exception,
-      stack: stack,
+      stack: stack as StackTrace,
       library: 'SVG',
       context: context,
     ));
diff --git a/lib/src/render_picture.dart b/lib/src/render_picture.dart
index c06daa0a..f428c332 100644
--- a/lib/src/render_picture.dart
+++ b/lib/src/render_picture.dart
@@ -208,7 +208,12 @@ void scaleCanvasToViewBox(
       desiredSize.width / viewBox.width,
       desiredSize.height / viewBox.height,
     );
-    final Offset shift = desiredSize / 2.0 - viewBox.size * scale / 2.0;
+    final Size scaledHalfViewBoxSize = viewBox.size * scale / 2.0;
+    final Size halfDesiredSize = desiredSize / 2.0;
+    final Offset shift = Offset(
+      halfDesiredSize.width - scaledHalfViewBoxSize.width,
+      halfDesiredSize.height - scaledHalfViewBoxSize.height,
+    );
     canvas.translate(shift.dx, shift.dy);
     canvas.scale(scale, scale);
   }
diff --git a/lib/src/svg/parsers.dart b/lib/src/svg/parsers.dart
index cb600a0e..e93e383e 100644
--- a/lib/src/svg/parsers.dart
+++ b/lib/src/svg/parsers.dart
@@ -200,7 +200,8 @@ Future<Image> resolveImage(String href) async {
     return null;
   }
 
-  final Function decodeImage = (Uint8List bytes) async {
+  final Future<Image> Function(Uint8List) decodeImage =
+      (Uint8List bytes) async {
     final Codec codec = await instantiateImageCodec(bytes);
     final FrameInfo frame = await codec.getNextFrame();
     return frame.image;
diff --git a/lib/src/svg/xml_parsers.dart b/lib/src/svg/xml_parsers.dart
index f3314154..ba13ad5b 100644
--- a/lib/src/svg/xml_parsers.dart
+++ b/lib/src/svg/xml_parsers.dart
@@ -147,7 +147,7 @@ DashOffset parseDashOffset(List<XmlElementAttribute> attributes) {
 double parseOpacity(List<XmlElementAttribute> attributes) {
   final String rawOpacity = getAttribute(attributes, 'opacity', def: null);
   if (rawOpacity != null) {
-    return parseDouble(rawOpacity).clamp(0.0, 1.0);
+    return parseDouble(rawOpacity).clamp(0.0, 1.0).toDouble();
   }
   return null;
 }
@@ -181,7 +181,7 @@ DrawablePaint parseStroke(
     def: '1.0',
   );
   final String rawOpacity = getAttribute(attributes, 'opacity');
-  double opacity = parseDouble(rawStrokeOpacity).clamp(0.0, 1.0);
+  double opacity = parseDouble(rawStrokeOpacity).clamp(0.0, 1.0).toDouble();
   if (rawOpacity != '') {
     opacity *= parseDouble(rawOpacity).clamp(0.0, 1.0);
   }
@@ -244,7 +244,7 @@ DrawablePaint parseFill(
   final String rawFill = getAttribute(el, 'fill');
   final String rawFillOpacity = getAttribute(el, 'fill-opacity', def: '1.0');
   final String rawOpacity = getAttribute(el, 'opacity');
-  double opacity = parseDouble(rawFillOpacity).clamp(0.0, 1.0);
+  double opacity = parseDouble(rawFillOpacity).clamp(0.0, 1.0).toDouble();
   if (rawOpacity != '') {
     opacity *= parseDouble(rawOpacity).clamp(0.0, 1.0);
   }
diff --git a/lib/src/vector_drawable.dart b/lib/src/vector_drawable.dart
index a811b684..41465b52 100644
--- a/lib/src/vector_drawable.dart
+++ b/lib/src/vector_drawable.dart
@@ -604,7 +604,7 @@ class DrawableDefinitionServer {
   /// Retreive a gradient from the pre-defined [DrawableGradient] collection.
   T getGradient<T extends DrawableGradient>(String id) {
     assert(id != null);
-    return _gradients[id];
+    return _gradients[id] as T;
   }
 
   /// Add a [DrawableGradient] to the pre-defined collection by [id].
@@ -1108,7 +1108,12 @@ class DrawableRasterImage implements Drawable {
       );
     }
     if (scale != 1.0 || offset != Offset.zero || transform != null) {
-      final Offset shift = desiredSize / 2.0 - imageSize * scale / 2.0;
+      final Size halfDesiredSize = desiredSize / 2.0;
+      final Size scaledHalfImageSize = imageSize * scale / 2.0;
+      final Offset shift = Offset(
+        halfDesiredSize.width - scaledHalfImageSize.width,
+        halfDesiredSize.height - scaledHalfImageSize.height,
+      );
       canvas.save();
       canvas.translate(offset.dx + shift.dx, offset.dy + shift.dy);
       canvas.scale(scale, scale);
diff --git a/lib/svg.dart b/lib/svg.dart
index 88adb6cd..0b72b74b 100644
--- a/lib/svg.dart
+++ b/lib/svg.dart
@@ -36,7 +36,7 @@ class Svg {
   /// The `colorFilter` property will be applied to any [Paint] objects used during drawing.
   ///
   /// The [key] will be used for debugging purposes.
-  FutureOr<PictureInfo> svgPictureDecoder(
+  Future<PictureInfo> svgPictureDecoder(
     Uint8List raw,
     bool allowDrawingOutsideOfViewBox,
     ColorFilter colorFilter,
@@ -64,7 +64,7 @@ class Svg {
   /// The `colorFilter` property will be applied to any [Paint] objects used during drawing.
   ///
   /// The [key] will be used for debugging purposes.
-  FutureOr<PictureInfo> svgPictureStringDecoder(
+  Future<PictureInfo> svgPictureStringDecoder(
       String raw,
       bool allowDrawingOutsideOfViewBox,
       ColorFilter colorFilter,
@@ -84,7 +84,7 @@ class Svg {
   /// Produces a [Drawableroot] from a [Uint8List] of SVG byte data (assumes UTF8 encoding).
   ///
   /// The [key] will be used for debugging purposes.
-  FutureOr<DrawableRoot> fromSvgBytes(Uint8List raw, String key) async {
+  Future<DrawableRoot> fromSvgBytes(Uint8List raw, String key) async {
     // TODO(dnfield): do utf decoding in another thread?
     // Might just have to live with potentially slow(ish) decoding, this is causing errors.
     // See: https://github.com/dart-lang/sdk/issues/31954
diff --git a/test/widget_svg_test.dart b/test/widget_svg_test.dart
index 45e993da..4e448a62 100644
--- a/test/widget_svg_test.dart
+++ b/test/widget_svg_test.dart
@@ -61,7 +61,7 @@ void main() {
     </g>
 </svg>''';
 
-  final Uint8List svg = utf8.encode(svgStr);
+  final Uint8List svg = utf8.encode(svgStr) as Uint8List;
 
   testWidgets('SvgPicture can work with a FittedBox',
       (WidgetTester tester) async {
@@ -258,10 +258,14 @@ void main() {
           onError: anyNamed('onError'),
           cancelOnError: anyNamed('cancelOnError')))
       .thenAnswer((Invocation invocation) {
-    final void Function(Uint8List) onData = invocation.positionalArguments[0];
-    final void Function(Object) onError = invocation.namedArguments[#onError];
-    final void Function() onDone = invocation.namedArguments[#onDone];
-    final bool cancelOnError = invocation.namedArguments[#cancelOnError];
+    final void Function(Uint8List) onData =
+        invocation.positionalArguments[0] as void Function(Uint8List);
+    final void Function(Object) onError =
+        invocation.namedArguments[#onError] as void Function(Object);
+    final VoidCallback onDone =
+        invocation.namedArguments[#onDone] as VoidCallback;
+    final bool cancelOnError =
+        invocation.namedArguments[#cancelOnError] as bool;
 
     return Stream<Uint8List>.fromIterable(<Uint8List>[svg]).listen(
       onData,
diff --git a/test/xml_svg_test.dart b/test/xml_svg_test.dart
index 6d7d4b11..eb0a0c5d 100644
--- a/test/xml_svg_test.dart
+++ b/test/xml_svg_test.dart
@@ -9,12 +9,13 @@ import 'package:flutter_svg/src/utilities/xml.dart';
 void main() {
   test('Xlink href tests', () {
     final XmlStartElementEvent el =
-        parseEvents('<test href="http://localhost" />').first;
+        parseEvents('<test href="http://localhost" />').first
+            as XmlStartElementEvent;
 
     final XmlStartElementEvent elXlink =
         parseEvents('<test xmlns:xlink="$kXlinkNamespace" '
                 'xlink:href="http://localhost" />')
-            .first;
+            .first as XmlStartElementEvent;
 
     expect(getHrefAttribute(el.attributes), 'http://localhost');
     expect(getHrefAttribute(elXlink.attributes), 'http://localhost');
@@ -24,7 +25,7 @@ void main() {
     final XmlStartElementEvent el =
         parseEvents('<test stroke="#fff" fill="#eee" stroke-dashpattern="1 2" '
                 'style="stroke-opacity:1;fill-opacity:.23" />')
-            .first;
+            .first as XmlStartElementEvent;
 
     expect(getAttribute(el.attributes, 'stroke'), '#fff');
     expect(getAttribute(el.attributes, 'fill'), '#eee');
@@ -40,7 +41,8 @@ void main() {
   // if the parsing logic changes, we can simplify some methods.  for now assert that whitespace in attributes is preserved
   test('Attribute WhiteSpace test', () {
     final XmlStartElementEvent xd =
-        parseEvents('<test attr="  asdf" attr2="asdf  " attr3="asdf" />').first;
+        parseEvents('<test attr="  asdf" attr2="asdf  " attr3="asdf" />').first
+            as XmlStartElementEvent;
 
     expect(
       xd.attributes[0].value,
@@ -60,15 +62,19 @@ void main() {
     const Rect rect = Rect.fromLTWH(0.0, 0.0, 100.0, 100.0);
 
     final XmlStartElementEvent svgWithViewBox =
-        parseEvents('<svg viewBox="0 0 100 100" />').first;
+        parseEvents('<svg viewBox="0 0 100 100" />').first
+            as XmlStartElementEvent;
     final XmlStartElementEvent svgWithViewBoxAndWidthHeight =
         parseEvents('<svg width="50px" height="50px" viewBox="0 0 100 100" />')
-            .first;
+            .first as XmlStartElementEvent;
     final XmlStartElementEvent svgWithWidthHeight =
-        parseEvents('<svg width="100" height="100" />').first;
+        parseEvents('<svg width="100" height="100" />').first
+            as XmlStartElementEvent;
     final XmlStartElementEvent svgWithViewBoxMinXMinY =
-        parseEvents('<svg viewBox="42 56 100 100" />').first;
-    final XmlStartElementEvent svgWithNoSizeInfo = parseEvents('<svg />').first;
+        parseEvents('<svg viewBox="42 56 100 100" />').first
+            as XmlStartElementEvent;
+    final XmlStartElementEvent svgWithNoSizeInfo =
+        parseEvents('<svg />').first as XmlStartElementEvent;
 
     expect(parseViewBox(svgWithViewBoxAndWidthHeight.attributes).size,
         const Size(50, 50));
@@ -86,15 +92,20 @@ void main() {
 
   test('TileMode tests', () {
     final XmlStartElementEvent pad =
-        parseEvents('<linearGradient spreadMethod="pad" />').first;
+        parseEvents('<linearGradient spreadMethod="pad" />').first
+            as XmlStartElementEvent;
     final XmlStartElementEvent reflect =
-        parseEvents('<linearGradient spreadMethod="reflect" />').first;
+        parseEvents('<linearGradient spreadMethod="reflect" />').first
+            as XmlStartElementEvent;
     final XmlStartElementEvent repeat =
-        parseEvents('<linearGradient spreadMethod="repeat" />').first;
+        parseEvents('<linearGradient spreadMethod="repeat" />').first
+            as XmlStartElementEvent;
     final XmlStartElementEvent invalid =
-        parseEvents('<linearGradient spreadMethod="invalid" />').first;
+        parseEvents('<linearGradient spreadMethod="invalid" />').first
+            as XmlStartElementEvent;
 
-    final XmlStartElementEvent none = parseEvents('<linearGradient />').first;
+    final XmlStartElementEvent none =
+        parseEvents('<linearGradient />').first as XmlStartElementEvent;
 
     expect(parseTileMode(pad.attributes), TileMode.clamp);
     expect(parseTileMode(invalid.attributes), TileMode.clamp);
@@ -106,9 +117,11 @@ void main() {
 
   test('@stroke-dashoffset tests', () {
     final XmlStartElementEvent abs =
-        parseEvents('<stroke stroke-dashoffset="20" />').first;
+        parseEvents('<stroke stroke-dashoffset="20" />').first
+            as XmlStartElementEvent;
     final XmlStartElementEvent pct =
-        parseEvents('<stroke stroke-dashoffset="20%" />').first;
+        parseEvents('<stroke stroke-dashoffset="20%" />').first
+            as XmlStartElementEvent;
 
     // TODO(dnfield): DashOffset is completely opaque right now, maybe expose the raw value?
     expect(parseDashOffset(abs.attributes), isNotNull);