initial commit adding metronome app

apps.json

@@ -1293,5 +1293,25 @@
         "evaluate": true
       }
     ]
+  },
+  {
+    "id": "Metronome",
+    "name": "Metronome",
+    "icon": "metronome_icon.png",
+    "version": "0.03",
+    "description": "Makes the watch blinking and vibrating with a given rate",
+    "tags": "tool",
+    "allow_emulator": true,
+    "storage": [
+      {
+        "name": "metronome.app.js",
+        "url": "metronome.js"
+      },
+      {
+        "name": "metronome.img",
+        "url": "metronome-icon.js",
+        "evaluate": true
+      }
+    ]
   }
 ]

apps/metronome/README.md

@@ -0,0 +1,10 @@
+# Metronome
+
+This metronome makes your watch blink and vibrate with a given rate.
+
+## Usage
+
+* Tap the screen at least three times. The app calculates the mean rate of your tapping. This rate is displayed in bmp while the text blinks and the watch softly vibrates with every beat.
+* Use `BTN1` to increase the bmp value by one.
+* Use `BTN3` to decrease the bmp value by one.
+* You can change the bpm value any time by tapping the screen or using `BTN1` and `BTN3`.

apps/metronome/metronome-icon.js

@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwxH+ABt4AB4fOFyFOABtUGDotOAAYvcp4ARqovbq0rACAvbqwABF98yGCAvdGAcHgAAEF8tWmIuGGA6QaF4lWFw4vgFwovPmIvuYDIvd0ejF59cF6qQFFwIvnMAguSqxfaFyQvYvOi0QuTF64uCAAQuRXwIvUqouEF6guFF5+cAAiOZF6iOaF5sxv+iF6xfRmVWFwWjv8rp4tSL6YvBqwuDMgQvnFwovURwIvQRggAELygvPgwuIF8ouEBwIvnFwwwXF54uBvwuFq0yF6buCF5guClQuFGAgvfFwcAF49WmIvRFwQvKFwkAmQvHYQMxF7l+FwgvKGAIvalQuGF5dWFx1VABVUvF4p0qAAdPCZNPF51OAD4vOKQIACF/4waF9wuEqgv/F/gwMF97vvAAUqADYtQAAMAADYuRGDgmLA="))

apps/metronome/metronome.info

@@ -0,0 +1 @@
+{"id":"metronome","name":"Metronome","src":"metronome.app.js", "icon": "metronome_icon.png", "sortorder":-2,"version":"0.03","files":"metronome.info,metronome.app.js, metronome_icon.png"}

apps/metronome/metronome.js

@@ -0,0 +1,93 @@
+var tStart = Date.now();
+var cindex=0;  // index to iterate through colous
+var bpm=60;  // ininital bpm value
+var time_diffs = [1000, 1000, 1000];  //array to calculate mean bpm
+var tindex=0;  //index to iterate through time_diffs
+
+Bangle.setLCDTimeout(undefined);  //do not deaktivate display while running this app
+
+function changecolor() {
+  const maxColors = 2;
+  const colors = {
+        0: { value: 0xFFFF, name: "White" },
+        1: { value: 0x000F, name: "Navy" },
+     //   2: { value: 0x03E0, name: "DarkGreen" },
+     //   3: { value: 0x03EF, name: "DarkCyan" },
+     //   4: { value: 0x7800, name: "Maroon" },
+     //   5: { value: 0x780F, name: "Purple" },
+     //   6: { value: 0x7BE0, name: "Olive" },
+     //   7: { value: 0xC618, name: "LightGray" },
+     //   8: { value: 0x7BEF, name: "DarkGrey" },
+     //   9: { value: 0x001F, name: "Blue" },
+     //   10: { value: 0x07E0, name: "Green" },
+     //   11: { value: 0x07FF, name: "Cyan" },
+     //   12: { value: 0xF800, name: "Red" },
+     //   13: { value: 0xF81F, name: "Magenta" },
+     //   14: { value: 0xFFE0, name: "Yellow" },
+     //   15: { value: 0xFFFF, name: "White" },
+     //   16: { value: 0xFD20, name: "Orange" },
+     //   17: { value: 0xAFE5, name: "GreenYellow" },
+     //   18: { value: 0xF81F, name: "Pink" },
+    };
+    g.setColor(colors[cindex].value);
+    if (cindex == maxColors-1) {
+      cindex = 0;
+    }
+    else {
+    cindex += 1;
+    }
+    return cindex;
+}
+
+function updateScreen() {
+  g.clear();
+  changecolor();
+  Bangle.buzz(50, 0.75);
+  g.setFont("Vector",48);
+  g.drawString(Math.floor(bpm)+"bpm", -1, 70);
+}
+
+Bangle.on('touch', function(button) {
+// setting bpm by tapping the screen. Uses the mean time difference between several tappings.
+    if (tindex < time_diffs.length) {
+      if (Date.now()-tStart < 5000) {
+     	 time_diffs[tindex] = Date.now()-tStart;
+      }
+    } else {
+      tindex=0;
+         time_diffs[tindex] = Date.now()-tStart;
+         }
+    tindex += 1;
+    mean_time = 0.0;
+    for(count = 0; count < time_diffs.length; count++) {
+      mean_time += time_diffs[count];
+    }
+    time_diff = mean_time/count;
+
+    tStart = Date.now();
+    clearInterval(time_diff);
+    g.clear();
+    g.setFont("Vector",48);
+    bpm = (60 * 1000/(time_diff));
+    g.drawString(Math.floor(bpm)+"bpm", -1, 70);
+    clearInterval(interval);
+    interval = setInterval(updateScreen, 60000 / bpm);
+  return bpm;
+});
+
+// enable bpm finetuning via buttons.
+setWatch(() => {
+  bpm += 1;
+  clearInterval(interval);
+  interval = setInterval(updateScreen, 60000 / bpm);
+}, BTN1, {repeat:true});
+
+setWatch(() => {
+  if (bpm > 1) {
+  bpm -= 1;
+  clearInterval(interval);
+  interval = setInterval(updateScreen, 60000 / bpm);
+  }
+}, BTN3, {repeat:true});
+
+interval = setInterval(updateScreen, 60000 / bpm);