add: 4th layer on bar chart

app/lib/widgets/bar_graph/bar_data.dart

@@ -16,14 +16,15 @@ class _BarDataState extends State<BarData> {
   // NB should be allocated values dynamically
   // Bar items show data for 10 previous days
   static const barData = <int, List<double>>{
-    0: [1.5, 4, 2.5],
-    1: [1.8, 5.6, 3],
-    2: [1.5, 3.1, 3.5],
-    3: [1.5, 1.5, 4],
-    4: [2, 2, 5],
-    5: [1.2, 1.5, 4.3],
-    6: [1.2, 4.8, 5],
+    0: [1.5, 3.2, 1.5, 2.2],
+    1: [1.8, 4.6, 2, 3.1],
+    2: [1.5, 2.1, 2.5, 1.8],
+    3: [1.5, 1, 3, 2.6],
+    4: [2, 2, 3.9, 2.3],
+    5: [1.2, 1.2, 3.3, 2.9],
+    6: [1.2, 2.3, 3.3, 3.2],
   };
+
   int touchedIndex = -1;
 
   @override
@@ -36,8 +37,9 @@ class _BarDataState extends State<BarData> {
       double value1,
       double value2,
       double value3,
+      double value4,
       ) {
-    final sum = value1 + value2 + value3;
+    final sum = value1 + value2 + value3 + value4;
     final isTouched = touchedIndex == x;
     return BarChartGroupData(
       x: x,
@@ -64,6 +66,11 @@ class _BarDataState extends State<BarData> {
             BarChartRodStackItem(
               value1 + value2,
               value1 + value2 + value3,
+              const Color(0xFF3766E0),
+            ),
+            BarChartRodStackItem(
+              value1 + value2 + value3,
+              value1 + value2 + value3 + value4,
               Colors.white60,
             ),
           ],
@@ -144,6 +151,7 @@ class _BarDataState extends State<BarData> {
                       e.value[0],
                       e.value[1],
                       e.value[2],
+                      e.value[3],
                     ),
                   ).toList(),
                 ),
@@ -156,8 +164,9 @@ class _BarDataState extends State<BarData> {
                   mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                   children: [
                     _buildLegendItem(Colors.white60, "Snow"),
+                    _buildLegendItem(const Color(0xFF3766E0), "Slush ice"),
                     _buildLegendItem(const Color(0xFF000085), "Black ice"),
-                    _buildLegendItem(const Color(0xFF13dbff), "Slush ice"),
+                    _buildLegendItem(const Color(0xFF13dbff), "Steel ice"),
                   ],
                 ),
               ),

app/lib/widgets/main_layout.dart

@@ -60,7 +60,7 @@ class _MapContainerWidgetState extends State<MapContainerWidget> {
   void handleSelection(int index) {
     String indexString = index.toString();
     setState(() {
-      // NB should be optimalised
+      // NB should be optimised
       for (Measurement measurement in widget.markerList) {
         for (SubDiv subdivision in measurement.subDivs) {
           if (subdivision.sub_div_id == indexString) {
@@ -283,8 +283,8 @@ class _MapContainerWidgetState extends State<MapContainerWidget> {
                             const SizedBox(width: 10),
                             Expanded(
                               child: Text(
-                                'For every x of y, there has to be z cm of '
-                                    'q for every kg of applied weight to ensure ?',
+                                'There may be multiple layers of black ice and slush ice stacked'
+                                    ' between the snow and the steel ice.',
                                 style: regTextStyle,
                               ),
                             ),