wt1.1.2 new treeview, bar chart for muscle development

lib/util/calculate.dart

@@ -0,0 +1,15 @@
+mixin Calculate {
+
+  double calculate1RM(double quantity, double unitQuantity) {
+    double weight = unitQuantity;
+    double repeat = quantity;
+    if ( weight == 0 || repeat == 0) {
+      return 0;
+    }
+    double rmWendler = weight * repeat * 0.0333 + weight;
+    double rmOconner = weight * (1 + repeat / 40);
+    double average = (rmWendler + rmOconner)/2;
+
+    return average;
+  }
+}

lib/util/common.dart

@@ -73,4 +73,10 @@ mixin Common {
     return _passwordRegExp.hasMatch(password);
   }
 
+  /// Calculates week number from a date as per https://en.wikipedia.org/wiki/ISO_week_date#Calculation
+  int weekNumber(DateTime date) {
+    int dayOfYear = int.parse(DateFormat("D").format(date));
+    return ((dayOfYear - date.weekday + 10) / 7).floor();
+  }
+
 }