Metrics: Add Calories based on average HR

fixes #1249

src/BasicRideMetrics.cpp

@@ -2553,3 +2553,69 @@ static bool addLeftRight()
 }
 static bool leftRightAdded = addLeftRight();
 //////////////////////////////////////////////////////////////////////////////
+
+struct TotalCalories : public RideMetric {
+    Q_DECLARE_TR_FUNCTIONS(TotalCalories)
+
+    private:
+    double average_hr, athlete_weight, duration, athlete_age;
+
+    public:
+
+    TotalCalories()
+    {
+        setSymbol("total_kcalories");
+        setInternalName("Calories");
+    }
+    void initialize() {
+        setName(tr("Calories (HR)"));
+        setMetricUnits(tr("kcal"));
+        setImperialUnits(tr("kcal"));
+        setType(RideMetric::Total);
+    }
+    void compute(const RideFile *ride, const Zones *, int,
+                 const HrZones *, int,
+                 const QHash<QString,RideMetric*> &deps,
+                 const Context *context) {
+
+        average_hr = deps.value("average_hr")->value(true);
+        athlete_weight = deps.value("athlete_weight")->value(true);
+        duration = deps.value("time_riding")->value(true); // time_riding or workout_time ?
+
+        athlete_age = ride->startTime().date().year() - appsettings->cvalue(context->athlete->cyclist, GC_DOB).toDate().year();
+        bool male = appsettings->cvalue(context->athlete->cyclist, GC_SEX).toInt() == 0;
+
+        double kcalories = 0.0;
+
+        if (duration>0 && average_hr>0 && athlete_weight>0 && athlete_age>0) {
+            //Male: ((-55.0969 + (0.6309 x HR) + (0.1988 x W) + (0.2017 x A))/4.184) x 60 x T
+            //Female: ((-20.4022 + (0.4472 x HR) - (0.1263 x W) + (0.074 x A))/4.184) x 60 x T
+            if (male)
+                kcalories = ((-55.0969 + (0.6309 * average_hr) + (0.1988 * athlete_weight) + (0.2017 * athlete_age))/4.184) * duration/60;
+            else
+                kcalories = ((-20.4022 + (0.4472 * average_hr) + (0.1263 * athlete_weight) + (0.074 * athlete_age))/4.184) * duration/60;
+
+        }
+        setValue(kcalories);
+    }
+
+    bool isRelevantForRide(const RideItem *ride) const { return ride->present.contains("H"); }
+
+    RideMetric *clone() const { return new TotalCalories(*this); }
+};
+
+static bool addTotalCalories() {
+    QVector<QString> deps;
+
+    deps.append("average_hr");
+    deps.append("time_riding");
+    deps.append("athlete_weight");
+
+    RideMetricFactory::instance().addMetric(TotalCalories(), &deps);
+    return true;
+}
+
+static bool totalCaloriesAdded = addTotalCalories();
+
+
+///////////////////////////////////////////////////////////////////////////////

src/RideMetric.cpp

@@ -102,8 +102,9 @@
 // 96  06  Jan 2015 Damien Grauser     Garmin Cycling Dynamics
 // 97  07  Jan 2015 Mark Liversedge    Added isSwim first class variable
 // 98  10  Jan 2015 Ale Martinez       Added Triscore and SwimScore metrics
+// 99  14  Jan 2015 Damien Grauser     Added TotalCalories
 
-int DBSchemaVersion = 98;
+int DBSchemaVersion = 99;
 
 RideMetricFactory *RideMetricFactory::_instance;
 QVector<QString> RideMetricFactory::noDeps;