Add new, more useful spirit level app

apps/angles/ChangeLog

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+0.01: New App!

apps/angles/app.js

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+g.clear().setRotation(1);
+// g.setRotation ALSO changes accelerometer axes
+var avrAngle = undefined;
+var history = [];
+
+var R = Bangle.appRect;
+var W = g.getWidth();
+var H = g.getHeight();
+var relativeTo = undefined;
+
+function draw(v) {
+  if (v===undefined) v = Bangle.getAccel();
+  // current angle
+  var d = Math.sqrt(v.y*v.y + v.z*v.z);
+  var ang = Math.atan2(-v.x, d)*180/Math.PI;
+  // Median filter
+  if (history.length > 10) history.shift(); // pull old reading off the start
+  history.push(ang);
+  avrAngle = history.slice().sort()[(history.length-1)>>1]; // median filter
+  // Render
+  var x = R.x + R.w/2;
+  var y = R.y + R.h/2;
+  g.reset().clearRect(R).setFontAlign(0,0);
+  var displayAngle = avrAngle;
+  g.setFont("6x15").drawString("ANGLE (DEGREES)", x, R.y2-8);
+  if (relativeTo!==undefined) {
+    g.drawString("RELATIVE TO", x,y-50);
+    g.setFont("Vector:30").drawString(relativeTo.toFixed(1),x,y-30);
+    y += 20;
+    displayAngle = displayAngle-relativeTo;
+  }
+  g.setFont("Vector:60").drawString(displayAngle.toFixed(1),x,y);
+
+}
+
+draw();
+Bangle.on('accel',draw);
+
+// Pressing the button turns relative angle on/off
+Bangle.setUI({
+  mode : "custom",
+  btn : function(n) {
+    if (relativeTo===undefined)
+      relativeTo = avrAngle;
+    else
+      relativeTo = undefined;
+    draw();
+  }
+});

apps/angles/icon.js

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+require("heatshrink").decompress(atob("mEw4cA///ov+5lChWMyGuxdzpdj4/lKf4AUkgQPgm0wAiPy2QCBsBkmS6QRNhIRBrVACJlPu2+pdICBcCrVJlvJtIRLifStMl3MtkARKydUyMkzMl0CMKyWWyUk1MkSJXkyR7BogRLgVcydSrVGzLHKgdLyfSpdE3JYKklqTwNJknJYJVkxcSp+pnygKhMs1OSEQOSYhVJl1bCIbBK5Mq7gRCyARJiVbqyPBCIKMKuVM24yBCIIiJnVOqu5CISMKp9JlvJCIRXKpP3nxoCRhUSBwSMNBwaMMgn6yp6DRhUl0mypiMMgM9ksipaMMhMtCINKRhlJmoRBpJuBCBIRGRhUE5I1CpKMLgmZn5ZDGhUAycnRoNMRhTDCsn3tfkRhLnDTwYQLNgSMMUQkyRhbGEkyMKAApFOAH4AGA"))

apps/angles/metadata.json

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+{
+  "id": "angles",
+  "name": "Angles (Spirit Level)",
+  "shortName": "Angles",
+  "version": "0.01",
+  "description": "Shows Angle or Relative angle in degrees (Digital Protractor/Inclinometer). Place Bangle sideways against a surface with the button facing away for best readings.",
+  "icon": "icon.png",
+  "screenshots": [{"url":"screenshot.png"}],
+  "tags": "tool",
+  "supports": ["BANGLEJS2"],
+  "storage": [
+    {"name":"angles.app.js","url":"app.js"},
+    {"name":"angles.img","url":"icon.js","evaluate":true}
+  ]
+}

apps/slevel/spiritlevel-icon.js

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-require("heatshrink").decompress(atob("mEwghC/AF8OoMRC6nu8kRiAuT93uGCgWBGCguCGCgsBoMUGCQuBFYMRDAIwQFQUhDAIFCFx/hiUyC4NOGAKMP8MRmYwBjwwBCxkEFAIXBiYwBC4PuC5hxCC4IwCDwPgC5gpBpxxBiMSL4QWMgQpBIIKnEFxsikcxOISODCxkDmUiLIQADFxsjUIQWELp0iLwYuQgMzkUiFydBkcyFycOoMSXoIuST4YuTB4NBZwIuSABAuPAA5dQdSQuBoIXBLwouPiUxGAguOC4imDRh3hC4wuMgBABC44WMgBxBI4wuNgBxCC4MhAoQWNC4IwBU4guOgEBFQVBiguQGAi7PGBCMPGBAuRGAoWSGAYuTAH4AcA="))
+require("heatshrink").decompress(atob("mEw4cA///ov+5lChWMyGuxdzpdj4/lKf4AUkgQPgm0wAiPy2QCBsBkmS6QRNhIRBrVACJlPu2+pdICBcCrVJlvJtIRLifStMl3MtkARKydUyMkzMl0CMKyWWyUk1MkSJXkyR7BogRLgVcydSrVGzLHKgdLyfSpdE3JYKklqTwNJknJYJVkxcSp+pnygKhMs1OSEQOSYhVJl1bCIbBK5Mq7gRCyARJiVbqyPBCIKMKuVM24yBCIIiJnVOqu5CISMKp9JlvJCIRXKpP3nxoCRhUSBwSMNBwaMMgn6yp6DRhUl0mypiMMgM9ksipaMMhMtCINKRhlJmoRBpJuBCBIRGRhUE5I1CpKMLgmZn5ZDGhUAycnRoNMRhTDCsn3tfkRhLnDTwYQLNgSMMUQkyRhbGEkyMKAApFOAH4AGA"))
-