Code for Bangle in Jim's MR2

bangle_mr2.js

// Where on the screen are we?
var W = 240;
var H = 180;
var X = 0;
var Y = 30;


// Misc setup
require("Font7x11Numeric7Seg").add(Graphics);
Bangle.setLCDPower(1);
Bangle.setLCDTimeout(0);
if (Bangle.setLocked) Bangle.setLocked(false);
Bluetooth.setConsole(1); // stop console cocking stuff up
if (!g.theme) g.theme = {fg:-1,bg:0};

// vars
var SLEEP_TIMEOUT = 10*60*1000; // time after which to sleep in msec. 10 min
var modeIndex = 0;
var SLEEPING = false;
var CURRENTMODE;
var lastPoked = Date.now(); // when should we last have gone to sleep?

// util functions
function resetGFX() {
  Bangle.setLCDOffset(0);
  //Bangle.lcdWr(0x36,0xA0);Bangle.lcdWr(0x37,[0,0x50]); for other way
  Bangle.lcdWr(0x36,0x60); Bangle.lcdWr(0x37,[0,0]);
  g.clear(1);
}

function changeMode(newMode) {
  if (CURRENTMODE) CURRENTMODE.kill();
  modeIndex  = newMode;
  resetGFX();
  CURRENTMODE = MODES[modeIndex]();
}

function wake() {
  SLEEPING = false;
  Bangle.setLCDPower(1);
  Bangle.setGPSPower(1);
  changeMode(0); // back to clock
}

function sleep() {
  SLEEPING = true;
  Bangle.setLCDPower(0);
  Bangle.setGPSPower(0);
}

function keepAwake() {
  lastPoked = Date.now();
  if (SLEEPING) wake();
}

// Utility fns for daylight saving
function lastSunday(month, year) {
  var d = new Date();
  var lastDayOfMonth = new Date(d.getFullYear(), month+1, 0);
  var day = lastDayOfMonth.getDay();
  return new Date(lastDayOfMonth.getFullYear(), lastDayOfMonth.getMonth(), lastDayOfMonth.getDate() - day);
}

function isBST(date) {
  var d = date || new Date();
  var starts = lastSunday(2, d.getFullYear());
  starts.setHours(1);
  var ends = lastSunday(9, d.getFullYear());
  starts.setHours(1);
  return d.getTime() >= starts.getTime() && d.getTime() < ends.getTime();
}

var MODES = [
  function() { // ======================================= Clock
    var firstDraw = true;
    function draw(d) {
      if (firstDraw) {
        g.clear(1);
        firstDraw = false;
      }
      if (isBST(d)) // add daylight saving
        d = new Date(d.getTime() + 3600000);
      var size = 6;
      var x = X + (W/2) - size*6,
          y = Y + (H/2) - size*7;
      g.reset();//.clearRect(x,y,x+W,y+size*12+8);
      g.setFont("7x11Numeric7Seg",size).setFontAlign(1,-1);
      g.drawString((" "+d.getHours()).substr(-2), x, y, true);
      g.setFontAlign(-1,-1);
      g.setColor((d.getSeconds()&1) ? g.theme.fg : g.theme.bg).drawString(":", x,y);
      g.setColor(g.theme.fg);
      g.drawString(("0"+d.getMinutes()).substr(-2),x+size*4,y, true);
      // draw seconds
      g.setFont("7x11Numeric7Seg",size/2);
      g.drawString(("0"+d.getSeconds()).substr(-2),x+size*18,y + size*7, true);
      // date
      var s = d.toString().split(" ").slice(0,4).join(" ");
      g.setFont("6x8").setFontAlign(0,-1);
      g.drawString("   "+s+"   ",X+W/2, y + size*12, true);
      // For working out sizing/alignment
      //g.drawRect(X,Y,X+W,Y+H);
    }
    function drawWait(fix) {
      firstDraw = true;
      g.clear(1).setFont("6x8",2).setFontAlign(0,0);
      g.drawString("Waiting for GPS",X+W/2,Y+H/2);
      g.setFont("6x8",1).drawString(fix.satellites+" Satellites",X+W/2,Y+H/2+20);
    }
    drawWait({satellites:0});
    function onGPS(fix) {
      if (!fix.time) drawWait(fix);
      else draw(fix.time);
    }
    Bangle.on("GPS", onGPS);
    return { kill : function() {
        Bangle.removeListener("GPS", onGPS);
      }
    };
  },
  function() { // ======================================= G METER
    g.clear();
    var xy;
    var maxAccel = 0;
    function onAccel(a) { // a.x is vertical - ignore!
      g.reset();
      if (xy) {
        g.setColor("#ff0000").fillRect(xy.x-2, xy.y-2, xy.x+2, xy.y+2);      
      }
      xy = {
        x : X + (W/2) + (a.y*W/2),
        y : Y + (H/2) + (a.z*W/2),
      };
      g.setColor(g.theme.fg).fillRect(xy.x-2, xy.y-2, xy.x+2, xy.y+2);      
      g.setFont("6x8",5).setFontAlign(0,1);
      var accel = Math.sqrt(a.y*a.y + a.z*a.z);
      if (accel > maxAccel)
        maxAccel = accel;
      g.drawString(" "+maxAccel.toFixed(2)+" ", X+W/2, Y+H-8, true);
    }
    Bangle.on("accel", onAccel);
    return { kill : function() {
        Bangle.removeListener("accel", onAccel);
      }
    };
  },
  function() { // ======================================= Speedo     
    function onGPS(fix) {
      //print(fix);
      g.reset().setFont("7x11Numeric7Seg",6).setFontAlign(0,0);
      var mph = isFinite(fix.speed) ? Math.round(fix.speed * 0.621371) : "---";
      g.drawString("  "+mph+"  ", X+W/2, Y+H/2 - 20, true);
      g.setFont("6x8",2);
      g.drawString("MPH", X+W/2, Y+H/2 + 40);
    }
    onGPS({});
    Bangle.on("GPS", onGPS);
    return { kill : function() {
        Bangle.removeListener("GPS", onGPS);
      }
    };
  },
];

wake();

Bangle.on('touch',function() {
  if (SLEEPING) keepAwake();  
  var newMode = modeIndex+1;
  if (newMode>=MODES.length)
    newMode=0;
  changeMode(newMode);
  if (CURRENTMODE) CURRENTMODE.kill();
  resetGFX();
  CURRENTMODE = MODES[modeIndex]();
});
Bangle.on("accel", function(a) {
  if (a.mag>1.05) keepAwake();
});

setInterval(function() {
  if (((Date.now()-lastPoked) > SLEEP_TIMEOUT) && !SLEEPING)
    sleep();
}, 10000);