Remove Material dependency

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/main.dart

@@ -1,7 +1,7 @@
 import "dart:math" as math;
 
-import "package:flutter/material.dart";
 import "package:flutter/services.dart";
+import "package:flutter/widgets.dart";
 
 // dart format off
 const List<int> map = [
@@ -318,7 +318,7 @@ class _PlayerState extends State<Player> {
         }
       }
 
-      Color wallColor = Colors.transparent;
+      Color wallColor = const Color.fromRGBO(0, 0, 0, 0);
 
       if (distanceVert < distanceHor) {
         rayX = vx;
@@ -437,7 +437,7 @@ class PlayerPainter extends CustomPainter {
     // Player dot
     canvas.drawRect(
       Rect.fromLTWH(offset.dx, offset.dy, 8, 8),
-      Paint()..color = Colors.yellow,
+      Paint()..color = const Color.fromRGBO(255, 255, 0, 1),
     );
 
     // Player direction line
@@ -445,7 +445,7 @@ class PlayerPainter extends CustomPainter {
       offset + const Offset(4, 4),
       offset + const Offset(4, 4) + (delta * 5),
       Paint()
-        ..color = Colors.yellow
+        ..color = const Color.fromRGBO(255, 255, 0, 1)
         ..strokeWidth = 2,
     );
   }
@@ -603,9 +603,9 @@ class MapPainter extends CustomPainter {
 
   @override
   void paint(Canvas canvas, Size size) {
-    final paintWhite = Paint()..color = Colors.white;
-    final paintBlack = Paint()..color = Colors.black;
-    final paintGrey = Paint()..color = Colors.grey;
+    final paintWhite = Paint()..color = const Color.fromRGBO(255, 255, 255, 1);
+    final paintBlack = Paint()..color = const Color.fromRGBO(0, 0, 0, 1);
+    final paintGrey = Paint()..color = const Color.fromRGBO(84, 84, 84, 1);
 
     canvas.drawRect(
       Rect.fromLTWH(0, 0, tileSize * mapX, tileSize * mapY),
@@ -645,7 +645,7 @@ class MapRayPainter extends CustomPainter {
         playerCenter,
         ray.hitPosition - const Offset(1, 1),
         Paint()
-          ..color = Colors.cyan
+          ..color = const Color.fromRGBO(0, 255, 255, 1)
           ..strokeWidth = 1,
       );
     }