health: calculate distance from steps

- multiplies step counts with stride length
- distance menu under step counting is only available if stride length is
set

apps/health/ChangeLog

@@ -29,3 +29,4 @@
 0.26: Implement API for activity fetching
 0.27: Fix typo in daily summary graph code causing graph not to load
       Fix daily summaries for 31st of the month
+0.28: Calculate distance from steps if new stride length setting is set

apps/health/app.js

@@ -1,3 +1,5 @@
+let settings;
+
 function menuMain() {
   E.showMenu({
     "": { title: /*LANG*/"Health Tracking" },
@@ -5,16 +7,30 @@ function menuMain() {
     /*LANG*/"Step Counting": () => menuStepCount(),
     /*LANG*/"Movement": () => menuMovement(),
     /*LANG*/"Heart Rate": () => menuHRM(),
-    /*LANG*/"Settings": () => eval(require("Storage").read("health.settings.js"))(()=>menuMain())
+    /*LANG*/"Settings": () => eval(require("Storage").read("health.settings.js"))(()=>{loadSettings();menuMain();})
   });
 }
 
 function menuStepCount() {
-  E.showMenu({
+  const menu = {
     "": { title:/*LANG*/"Steps" },
     /*LANG*/"< Back": () => menuMain(),
-    /*LANG*/"per hour": () => stepsPerHour(),
-    /*LANG*/"per day": () => stepsPerDay()
+    /*LANG*/"per hour": () => stepsPerHour(menuStepCount),
+    /*LANG*/"per day": () => stepsPerDay(menuStepCount)
+  };
+  if (settings.strideLength) {
+      menu[/*LANG*/"distance"] = () => menuDistance();
+  }
+
+  E.showMenu(menu);
+}
+
+function menuDistance() {
+  E.showMenu({
+    "": { title:/*LANG*/"Distance" },
+    /*LANG*/"< Back": () => menuStepCount(),
+    /*LANG*/"per hour": () => stepsPerHour(menuDistance, settings.strideLength),
+    /*LANG*/"per day": () => stepsPerDay(menuDistance, settings.strideLength)
   });
 }
 
@@ -36,23 +52,23 @@ function menuHRM() {
   });
 }
 
-function stepsPerHour() {
+function stepsPerHour(back, mult) {
   E.showMessage(/*LANG*/"Loading...");
   current_selection = "stepsPerHour";
   var data = new Uint16Array(24);
   require("health").readDay(new Date(), h=>data[h.hr]+=h.steps);
-  setButton(menuStepCount);
-  barChart(/*LANG*/"HOUR", data);
+  setButton(back, mult);
+  barChart(/*LANG*/"HOUR", data, mult);
 }
 
-function stepsPerDay() {
+function stepsPerDay(back, mult) {
   E.showMessage(/*LANG*/"Loading...");
   current_selection = "stepsPerDay";
   var data = new Uint16Array(32);
   require("health").readDailySummaries(new Date(), h=>data[h.day]+=h.steps);
-  setButton(menuStepCount);
-  barChart(/*LANG*/"DAY", data);
-  drawHorizontalLine(settings.stepGoal);
+  setButton(back, mult);
+  barChart(/*LANG*/"DAY", data, mult);
+  drawHorizontalLine(settings.stepGoal * (mult || 1));
 }
 
 function hrmPerHour() {
@@ -139,7 +155,11 @@ function get_data_length(arr) {
   return nlen;
 }
 
-function barChart(label, dt) {
+function barChart(label, dt, mult) {
+  if (mult !== undefined) {
+    // Calculate distance from steps
+    dt.forEach((val, i) => dt[i] = val*mult);
+  }
   data_len = get_data_length(dt);
   chart_index = Math.max(data_len - 5, -5);  // choose initial index that puts the last day on the end
   chart_max_datum = max(dt);                 // find highest bar, for scaling
@@ -180,7 +200,7 @@ function drawHorizontalLine(value) {
   g.setColor(g.theme.fg).drawLine(0, top ,g.getWidth(), top);
 }
 
-function setButton(fn) {
+function setButton(fn, mult) {
   Bangle.setUI({mode:"custom",
                 back:fn,
                 swipe:(lr,ud) => {
@@ -194,12 +214,16 @@ function setButton(fn) {
     }
     drawBarChart();
     if (current_selection == "stepsPerDay") {
-      drawHorizontalLine(settings.stepGoal);
+      drawHorizontalLine(settings.stepGoal * (mult || 1));
     }
   }});
 }
 
+function loadSettings() {
+  settings = require("Storage").readJSON("health.json",1)||{};
+}
+
 Bangle.loadWidgets();
 Bangle.drawWidgets();
-var settings = require("Storage").readJSON("health.json",1)||{};
+loadSettings();
 menuMain();

apps/health/metadata.json

@@ -2,7 +2,7 @@
   "id": "health",
   "name": "Health Tracking",
   "shortName": "Health",
-  "version": "0.27",
+  "version": "0.28",
   "description": "Logs health data and provides an app to view it",
   "icon": "app.png",
   "tags": "tool,system,health",

apps/health/settings.js

@@ -8,44 +8,85 @@
   function setSettings() {
     require("Storage").writeJSON("health.json", settings);
   }
-  E.showMenu({
-    "": { title: /*LANG*/"Health Tracking" },
 
-    /*LANG*/"< Back": () => back(),
+  function settingsMenu() {
+    E.showMenu({
+      "": { title: /*LANG*/"Health Tracking" },
 
-    /*LANG*/"HRM Interval": {
-      value: settings.hrm,
-      min: 0,
-      max: 3,
-      format: v => [
-        /*LANG*/"Off",
-        /*LANG*/"3 min",
-        /*LANG*/"10 min",
-        /*LANG*/"Always"
-      ][v],
-      onchange: v => {
-        settings.hrm = v;
-        setSettings();
-      }
-    },
+      /*LANG*/"< Back": () => back(),
 
-    /*LANG*/"Daily Step Goal": {
-      value: settings.stepGoal,
-      min: 0,
-      max: 20000,
-      step: 250,
-      onchange: v => {
-        settings.stepGoal = v;
+      /*LANG*/"HRM Interval": {
+        value: settings.hrm,
+        min: 0,
+        max: 3,
+        format: v => [
+          /*LANG*/"Off",
+          /*LANG*/"3 min",
+          /*LANG*/"10 min",
+          /*LANG*/"Always"
+        ][v],
+        onchange: v => {
+          settings.hrm = v;
+          setSettings();
+        }
+      },
+
+      /*LANG*/"Daily Step Goal": {
+        value: settings.stepGoal,
+        min: 0,
+        max: 20000,
+        step: 250,
+        onchange: v => {
+          settings.stepGoal = v;
+          setSettings();
+        }
+      },
+
+      /*LANG*/"Step Goal Notification": {
+        value: "stepGoalNotification" in settings ? settings.stepGoalNotification : false,
+        format: () => (settings.stepGoalNotification ? 'Yes' : 'No'),
+        onchange: () => {
+          settings.stepGoalNotification = !settings.stepGoalNotification;
+          setSettings();
+        }
+      },
+
+      /*LANG*/"Stride length": () => strideLengthMenu()
+    });
+  }
+
+  function strideLengthMenu() {
+    const menu = {
+      "" : { title : /*LANG*/"Stride length" },
+
+      "< Back" : () => {
         setSettings();
-      }
-    },
-    /*LANG*/"Step Goal Notification": {
-      value: "stepGoalNotification" in settings ? settings.stepGoalNotification : false,
-      format: () => (settings.stepGoalNotification ? 'Yes' : 'No'),
-      onchange: () => {
-        settings.stepGoalNotification = !settings.stepGoalNotification;
-        setSettings();
-      }
-    }
-  });
+        settingsMenu();
+      },
+
+      "x 0.01" : {
+        value : settings.strideLength === undefined ? 0 : settings.strideLength,
+        min:0,
+        step:0.01,
+        format: v => require("locale").distance(v, 2),
+        onchange : v => {
+          settings.strideLength=v;
+          menu["x 0.1"].value = v;
+        },
+      },
+      "x 0.1" : {
+        value : settings.strideLength === undefined ? 0 : settings.strideLength,
+        min:0,
+        step:0.1,
+        format: v => require("locale").distance(v, 2),
+        onchange : v => {
+          settings.strideLength=v;
+          menu["x 0.01"].value = v;
+        },
+      },
+    };
+    E.showMenu(menu);
+  }
+
+  settingsMenu();
 })