Adds BatteryChart app and widget

apps.json

@@ -1131,5 +1131,18 @@
     "storage": [
        {"name":"custom"}
     ]
+  },
+  { "id": "batchart",
+    "name": "Battery Chart",
+    "shortName":"BatChart",
+    "icon": "widget.png",
+    "version":"0.01",
+    "description": "A widget and an app for recording and visualizing battery percentage over time.",
+    "tags": "app,widget,battery,time,record,chart,tool",
+    "storage": [
+      {"name":"batchart.wid.js","url":"widget.js"},
+      {"name":"batchart.app.js","url":"app.js"},
+      {"name":"batchart.img.js","url":"app-icon.js"}
+    ]
   }
 ]

apps/batchart/ChangeLog

@@ -0,0 +1 @@
+0.01: New App!

apps/batchart/app.js

@@ -0,0 +1,32 @@
+// place your const, vars, functions or classes here
+
+function renderBatteryChart(){
+  g.drawString("t", 215, 175);
+  g.drawLine(40,190,40,80);
+  
+  g.drawString("%", 39, 70);
+  g.drawString("100", 15, 75);
+  g.drawLine(35,80,40,80);
+  
+  g.drawString("50", 20,125);
+  g.drawLine(35,130,40,130);
+  
+  g.drawString("0", 25, 175);
+  g.drawLine(35,180,210,180);
+  
+  g.drawString("Chart not yet functional", 60, 125);
+}
+
+// special function to handle display switch on
+Bangle.on('lcdPower', (on) => {
+  if (on) {
+    // call your app function here
+    // If you clear the screen, do Bangle.drawWidgets();
+    renderBatteryChart();
+  }
+});
+
+g.clear();
+// call your app function here
+
+renderBatteryChart();

apps/batchart/widget.js

@@ -0,0 +1,35 @@
+WIDGETS = {};
+
+(() => {
+  var settings = {};
+  var batChartFile; // file for battery percentage recording
+  const recordingInterval10Min = 60*10*1000;
+  const recordingInterval10S = 10*1000; //For testing 
+  var recordingInterval = null;
+
+  // draw your widget
+  function draw() {
+    if (!settings.isRecording) return;
+    g.reset();
+    g.drawString("BC", this.x, this.y);
+  }
+
+  // Called by the heart app to reload settings and decide what's
+  function reload() {
+      WIDGETS["batchart"].width = 24;
+      batChartFile = require("Storage").open(".batchart","a");
+      recordingInterval = setInterval(()=>{
+        if (batChartFile)
+          console.log ([getTime().toFixed(0),E.getBattery()].join(","));
+          //batChartfile.write([getTime().toFixed(0),E.getBattery].join(",")+"\n");
+      }, recordingInterval10S)
+  }
+
+  // add the widget
+  WIDGETS["batchart"]={area:"tl",width:24,draw:draw,reload:function() {
+    reload();
+    Bangle.drawWidgets(); // relayout all widgets
+  }};
+  // load settings, set correct widget width
+  reload();
+})()