Show difference of last measurement to pressure average of the the last three hours and an arrow indicating the trend in the widget

apps/widbaroalarm/ChangeLog

@@ -3,3 +3,4 @@
 0.03: Fix crash
 0.04: Use Prompt with dismiss and pause
       Improve barometer value median calculation
+0.05: Show difference of last measurement to pressure average of the the last three hours and an arrow indicating the trend in the widget

apps/widbaroalarm/README.md

@@ -19,7 +19,9 @@ Get a notification when the pressure reaches defined thresholds.
 * Pause delay: Same as Dismiss delay but longer (useful for meetings and such). From 30 to 240 min
 
 ## Widget
-The widget shows two rows: pressure value of last measurement and pressure average of the the last three hours.
+The widget shows two rows: 
+1. pressure value of last measurement
+2. difference of last measurement to pressure average of the the last three hours and an arrow indicating the trend
 
 ## Creator
 Marco ([myxor](https://github.com/myxor))

apps/widbaroalarm/metadata.json

@@ -9,6 +9,7 @@
   "tags": "tool,barometer",
   "supports": ["BANGLEJS2"],
   "readme": "README.md",
+  "screenshots": [{"url":"screenshot-dark.png"}],
   "storage": [
     {"name":"widbaroalarm.wid.js","url":"widget.js"},
     {"name":"widbaroalarm.settings.js","url":"settings.js"},

apps/widbaroalarm/widget.js

@@ -11,18 +11,14 @@
 let settings;
 
 function loadSettings() {
-    settings = Object.assign(
-      storage.readJSON("widbaroalarm.default.json", true) || {},
-      storage.readJSON(SETTINGS_FILE, true) || {}
-    );
+  settings =
+      Object.assign(storage.readJSON("widbaroalarm.default.json", true) || {},
+                    storage.readJSON(SETTINGS_FILE, true) || {});
 }
 
 loadSettings();
 
-
-  function setting(key) {
-    return settings[key];
-  }
+function setting(key) { return settings[key]; }
 
 function saveSetting(key, value) {
   settings[key] = value;
@@ -31,19 +27,17 @@
 
 const interval = setting("interval");
 
-  let history3 = storage.readJSON(LOG_FILE, true) || []; // history of recent 3 hours
+let history3 =
+    storage.readJSON(LOG_FILE, true) || []; // history of recent 3 hours
 
 function showAlarm(body, key) {
-    if (body == undefined) return;
+  if (body == undefined)
+    return;
   stop = true;
 
   E.showPrompt(body, {
      title : "Pressure alarm",
-      buttons: {
-        "Ok": 1,
-        "Dismiss": 2,
-        "Pause": 3
-      }
+     buttons : {"Ok" : 1, "Dismiss" : 2, "Pause" : 3}
    }).then(function(v) {
     const tsNow = Math.round(Date.now() / 1000); // seconds
 
@@ -51,19 +45,20 @@
       saveSetting(key, tsNow);
     }
     if (v == 2) {
-        // save timestamp of the future so that we do not warn again for the same event until then
+      // save timestamp of the future so that we do not warn again for the same
+      // event until then
       saveSetting(key, tsNow + 60 * setting('dismissDelayMin'));
     }
     if (v == 3) {
-        // save timestamp of the future so that we do not warn again for the same event until then
+      // save timestamp of the future so that we do not warn again for the same
+      // event until then
       saveSetting(key, tsNow + 60 * setting('pauseDelayMin'));
     }
     stop = false;
     load();
   });
 
-    if (setting("buzz") &&
-      !(storage.readJSON('setting.json', 1) || {}).quiet) {
+  if (setting("buzz") && !(storage.readJSON('setting.json', 1) || {}).quiet) {
     Bangle.buzz();
   }
 
@@ -73,22 +68,19 @@
   }, 20000);
 }
 
-
 function doWeNeedToWarn(key) {
   const tsNow = Math.round(Date.now() / 1000); // seconds
   return setting(key) == 0 || setting(key) < tsNow;
 }
 
 function checkForAlarms(pressure) {
-    if (pressure == undefined || pressure <= 0) return;
+  if (pressure == undefined || pressure <= 0)
+    return;
 
   let alreadyWarned = false;
 
   const ts = Math.round(Date.now() / 1000); // seconds
-    const d = {
-      "ts": ts,
-      "p": pressure
-    };
+  const d = {"ts" : ts, "p" : pressure};
 
   // delete entries older than 3h
   for (let i = 0; i < history3.length; i++) {
@@ -105,7 +97,8 @@
     // Is below the alarm threshold?
     if (pressure <= setting("min")) {
       if (!doWeNeedToWarn("lastLowWarningTs")) {
-          showAlarm("Pressure low: " + Math.round(pressure) + " hPa", "lastLowWarningTs");
+        showAlarm("Pressure low: " + Math.round(pressure) + " hPa",
+                  "lastLowWarningTs");
         alreadyWarned = true;
       }
     } else {
@@ -117,7 +110,8 @@
     // Is above the alarm threshold?
     if (pressure >= setting("max")) {
       if (doWeNeedToWarn("lastHighWarningTs")) {
-          showAlarm("Pressure high: " + Math.round(pressure) + " hPa", "lastHighWarningTs");
+        showAlarm("Pressure high: " + Math.round(pressure) + " hPa",
+                  "lastHighWarningTs");
         alreadyWarned = true;
       }
     } else {
@@ -146,7 +140,9 @@
           if (diffPressure > drop3halarm) {
             if (doWeNeedToWarn("lastDropWarningTs")) {
               showAlarm((Math.round(diffPressure * 10) / 10) + " hPa/3h from " +
-                  Math.round(oldestPressure) + " to " + Math.round(pressure) + " hPa", "lastDropWarningTs");
+                            Math.round(oldestPressure) + " to " +
+                            Math.round(pressure) + " hPa",
+                        "lastDropWarningTs");
             }
           } else {
             saveSetting("lastDropWarningTs", 0);
@@ -160,7 +156,9 @@
           if (diffPressure > raise3halarm) {
             if (doWeNeedToWarn("lastRaiseWarningTs")) {
               showAlarm((Math.round(diffPressure * 10) / 10) + " hPa/3h from " +
-                  Math.round(oldestPressure) + " to " + Math.round(pressure) + " hPa", "lastRaiseWarningTs");
+                            Math.round(oldestPressure) + " to " +
+                            Math.round(pressure) + " hPa",
+                        "lastRaiseWarningTs");
             }
           } else {
             saveSetting("lastRaiseWarningTs", 0);
@@ -176,8 +174,11 @@
   // write data to storage
   storage.writeJSON(LOG_FILE, history3);
 
-    // calculate 3h average for widget
-    if (history3.length > 0) {
+  calculcate3hAveragePressure();
+}
+
+function calculcate3hAveragePressure() {
+  if (history3 != undefined && history3.length > 0) {
     let sum = 0;
     for (let i = 0; i < history3.length; i++) {
       sum += history3[i]["p"];
@@ -188,7 +189,6 @@
   }
 }
 
-
 /*
  turn on barometer power
  take multiple measurements
@@ -197,11 +197,13 @@
  turn off barometer power
 */
 function check() {
-    if (stop) return;
+  if (stop)
+    return;
   const MEDIANLENGTH = 20;
   Bangle.setBarometerPower(true, "widbaroalarm");
   Bangle.on('pressure', function(e) {
-      while (currentPressures.length > MEDIANLENGTH) currentPressures.pop();
+    while (currentPressures.length > MEDIANLENGTH)
+      currentPressures.pop();
     currentPressures.unshift(e.pressure);
     median = currentPressures.slice().sort();
 
@@ -215,9 +217,7 @@
     }
   });
 
-    setTimeout(function() {
-      turnOff();
-    }, 10000);
+  setTimeout(function() { turnOff(); }, 10000);
 }
 
 function turnOff() {
@@ -225,9 +225,7 @@
     Bangle.setBarometerPower(false, "widbaroalarm");
 }
 
-  function reload() {
-    check();
-  }
+function reload() { check(); }
 
 function draw() {
   if (global.WIDGETS != undefined && typeof global.WIDGETS === "object") {
@@ -241,21 +239,46 @@
   g.reset();
   if (setting("show")) {
     g.setFont("6x8", 1).setFontAlign(1, 0);
+    const x = this.x, y = this.y;
     if (medianPressure == undefined) {
+
+      // trigger a new check
       check();
-        const x = this.x,
-          y = this.y;
-        g.drawString("...", x + 24, y + 6);
-        setTimeout(function() {
-          g.setFont("6x8", 1).setFontAlign(1, 0);
-          g.drawString(Math.round(medianPressure), x + 24, y + 6);
-        }, 10000);
-      } else {
-        g.drawString(Math.round(medianPressure), this.x + 24, this.y + 6);
+
+      // lets load last value from log (if available)
+      if (history3.length > 0) {
+        medianPressure = history3[history3.length - 1]["p"];
       }
 
-      if (threeHourAvrPressure != undefined && threeHourAvrPressure > 0) {
-        g.drawString(Math.round(threeHourAvrPressure), this.x + 24, this.y + 6 + 10);
+      g.drawString("...", x + 24, y + 6);
+      g.setFont("6x8", 1).setFontAlign(1, 0);
+      g.drawString(Math.round(medianPressure), x + 24, y + 6);
+    } else {
+      g.drawString(Math.round(medianPressure), x + 24, y + 6);
+    }
+
+    if (threeHourAvrPressure == undefined) {
+      calculcate3hAveragePressure();
+    } 
+    if (threeHourAvrPressure != undefined) {
+      if (medianPressure != undefined) {
+        let icon;
+
+        const diff = threeHourAvrPressure - medianPressure;
+
+        if (diff == 0) {
+          icon = atob("DAyBAAAAAAAAIAEAGD+AEAIAAAAAAA=="); // allow right
+        } else {
+          if (diff < 0) {
+            icon = atob("DAyBAAAAAAAAfAHALATAgBAAAAAAAA=="); // arrow up
+          } else {
+            icon = atob("DAyBAAAAAAABAAgATALAHAHAeAAAAA=="); // arrow down
+          }
+        }
+
+        g.drawImage(icon, x, y + 6 + 4);
+        g.drawString((diff < 0 ? "+" : "-" ) + Math.round(diff), x + 24, y + 6 + 10);
+      }
     }
   }
 }
@@ -264,5 +287,4 @@
   setInterval(check, interval * 60000);
 }
 draw();
-
 })();