improved graph appearance to be more clear

lib/Widgets/reading_graph.dart

@@ -12,10 +12,6 @@ class ReadingGraph extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    if (_readings.isEmpty) {
-      return Text('No readings on record.');
-    }
-
     final spots = _readings
         .map<FlSpot>(
           (e) => FlSpot(
@@ -46,6 +42,7 @@ class ReadingGraph extends StatelessWidget {
         ],
         titlesData: FlTitlesData(
           bottomTitles: getBottomTitles(spots),
+          leftTitles: getLeftTitles(spots),
           topTitles: const AxisTitles(sideTitles: SideTitles()),
           rightTitles: const AxisTitles(sideTitles: SideTitles()),
         ),
@@ -54,28 +51,31 @@ class ReadingGraph extends StatelessWidget {
   }
 
   AxisTitles getBottomTitles(List<FlSpot> spots) {
-    final maxX = double.parse(
-        spots.map<double>((e) => (e.x)).reduce(max).toStringAsFixed(0));
-    final minX = double.parse(
-        spots.map<double>((e) => e.x).reduce(min).toStringAsFixed(0));
-    final middle =
-        double.parse(spots[spots.length ~/ 2].x.toStringAsFixed(0)) + 4;
-
     return AxisTitles(
       sideTitles: SideTitles(
-        interval: 1,
+        interval: 90,
+        reservedSize: 40,
         showTitles: true,
-        getTitlesWidget: (value, meta) {
-          String text = '';
-          if (value == maxX) {
-            text = getDate(spots.first.x);
-          } else if (double.parse(value.toStringAsFixed(0)) == minX) {
-            text = getDate(spots.last.x);
-          } else if (value == middle) {
-            text = getDate(middle);
-          }
-          return Text(text);
-        },
+        maxIncluded: false,
+        getTitlesWidget: (value, meta) => SideTitleWidget(
+          meta: meta,
+          child: Text(getDate(value)),
+        ),
+      ),
+    );
+  }
+
+  AxisTitles getLeftTitles(List<FlSpot> spots) {
+    return AxisTitles(
+      sideTitles: SideTitles(
+        reservedSize: 50,
+        showTitles: true,
+        maxIncluded: false,
+        minIncluded: false,
+        getTitlesWidget: (value, meta) => SideTitleWidget(
+          meta: meta,
+          child: Text(value.toStringAsFixed(2)),
+        ),
       ),
     );
   }