Added first version of CRP Assist app

apps.json

@@ -2033,5 +2033,30 @@
       {"name":"widancs.wid.js","url":"ancs.min.js"},
       {"name":"widancs.settings.js","url":"settings.js"}
     ]
+  },
+  {
+    "id": "cprassist",
+    "name":"CPR Assist",
+    "icon":"cprassist-icon.png",
+    "version": "0.01",
+    "readme": "README.md",
+    "description": "Provides assistance while performing a CPR",
+    "tags": "tool,firstaid",
+    "allow_emulator": true,
+    "storage": [
+      {
+        "name": "cprassist.app.js",
+        "url": "cprassist.js"
+      },
+      {
+        "name": "cprassist.img",
+        "url": "cprassist-icon.js",
+        "evaluate": true
+      },
+      {
+        "name": "cprassist.settings.js",
+        "url": "settings.js"
+      }
+    ]
   }
 ]

apps/cprassist/ChangeLog

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

apps/cprassist/README.md

@@ -0,0 +1,24 @@
+# CPR Assist
+
+Provides assistance while performing a CPR
+
+## Usage
+
+The app alternates between the phases for
+chest compression and rescue breaths in an in an endless loop.
+In the chest compression phase the the watch will provide a
+buzz at a rate of 100 rpm for 30 repetitions.
+A longer buzz introduces an interval of 4 seconds to perform
+2 rescue breaths.
+A ratio of chest compressions to rescue breaths is also
+displayed in the bottom of the screen.
+
+The number of repetitions for chest compression and
+rescue breaths, the rpm rate and the duration of the
+rescue breath phase can be adjusted in the settings.
+See e.g. [CPR on Wikipedia](https://en.wikipedia.org/wiki/Cardiopulmonary_resuscitation)
+for futher information and updates on the recommendations.
+
+## Attributions
+
+Icon source: https://commons.wikimedia.org/wiki/File:ISO_7010_E003_-_First_aid_sign.svg

apps/cprassist/cprassist-icon.js

@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwwhC/AH4Arg93AB1wC/dxkQACi4XRuf/AAU3C/4X/C+sTmYABn4XD+YICmIXJl4TDAA/yC/4X/C+LXXAAdzC4c3BQgX/C/4X0uMiAAUXC6IAKC+wA/AH4AkA=="))

apps/cprassist/cprassist.js

@@ -0,0 +1,79 @@
+const SETTINGS_FILE = 'cprassist.settings.json';
+const SHORT_BUZZ_PERIOD = 80;
+const LONG_BUZZ_PERIOD = 800;
+
+Bangle.setLCDTimeout(undefined);  // do not deaktivate display while running this app
+
+let settings;
+
+function setting(key) {
+  const DEFAULTS = {
+    'compression_count': 30,
+    'breath_count': 2,
+    'compression_rpm': 100,
+    'breath_period_sec': 4
+  };
+  if (!settings) {
+    const storage = require("Storage");
+    settings = storage.readJSON(SETTINGS_FILE, 1) || {};
+  }
+  return (key in settings)
+    ? settings[key]
+    : DEFAULTS[key];
+}
+
+let counter = setting('compression_count');
+
+function provideFeedback() {
+  let period = counter > 0
+    ? SHORT_BUZZ_PERIOD
+    : LONG_BUZZ_PERIOD;
+  try {
+    Bangle.buzz(period, 1.0);
+  } catch(err) {
+  }
+}
+
+function drawHeart() {
+  g.fillCircle(40, 92, 12);
+  g.fillCircle(60, 92, 12);
+  g.fillPoly([29, 98, 50, 120, 71, 98]);
+}
+
+function updateScreen() {
+  const colors = [0xFFFF, 0x9492];
+  g.reset().clearRect(0, 50, 250, 150);
+  if (counter > 0) {
+    g.setFont("Vector", 40).setFontAlign(0, 0);
+    g.setColor(colors[counter%2]);
+    drawHeart();
+    g.drawString(counter + "", g.getWidth()/2, 100);
+  } else {
+    g.setFont("Vector", 20).setFontAlign(0, 0);
+    g.drawString("RESCUE", g.getWidth()/2, 70);
+    g.drawString("BREATHS", g.getWidth()/2, 120);
+  }
+}
+
+function tick() {
+  provideFeedback();
+  updateScreen();
+  if (counter == 0) {
+    var reset = function() {
+      counter = setting('compression_count');
+      clearInterval(interval);
+      interval = setInterval(tick, 60000/setting('compression_rpm'));
+    };
+    clearInterval(interval);
+    interval = setInterval(reset, setting('breath_period_sec')*1000);
+  }
+  counter -= 1;
+}
+
+interval = setInterval(tick, 60000/setting('compression_rpm'));
+
+g.clear(1).setFont("6x8");
+g.drawString(setting('compression_count') + ' / ' + setting('breath_count'), 30, 200);
+
+Bangle.loadWidgets();
+Bangle.drawWidgets();

apps/cprassist/settings.js

@@ -0,0 +1,64 @@
+// This file should contain exactly one function, which shows the app's settings
+/**
+ * @param {function} back Use back() to return to settings menu
+ */
+(function(back) {
+  const SETTINGS_FILE = 'cprassist.settings.json';
+
+  // initialize with default settings...
+  let s = {
+    'compression_count': 30,
+    'breath_count': 2,
+    'compression_rpm': 100,
+    'breath_period_sec': 4
+  };
+  // ...and overwrite them with any saved values
+  // This way saved values are preserved if a new version adds more settings
+  const storage = require('Storage');
+  const saved = storage.readJSON(SETTINGS_FILE, 1) || {};
+  for (const key in saved) {
+    s[key] = saved[key];
+  }
+
+  // creates a function to safe a specific setting
+  function save(key) {
+    return function(value) {
+      s[key] = value;
+      storage.write(SETTINGS_FILE, s);
+    };
+  }
+
+  const menu = {
+    '': { 'title': 'CPR Assist' },
+    '< Back': back,
+    'chest compr.': {
+      value: s.compression_count,
+      min: 1,
+      max: 200,
+      step: 1,
+      onchange: save('compression_count'),
+    },
+    'rescue breaths': {
+      value: s.breath_count,
+      min: 0,
+      max: 100,
+      step: 1,
+      onchange: save('breath_count'),
+    },
+    'rpm': {
+      value: s.compression_rpm,
+      min: 1,
+      max: 200,
+      step: 10,
+      onchange: save('compression_rpm'),
+    },
+    'breaths period': {
+      value: s.breath_period_sec,
+      min: 1,
+      max: 60,
+      step: 1,
+      onchange: save('breath_period_sec'),
+    }
+  };
+  E.showMenu(menu);
+});