Create app.js

apps/speedalt/app.js

@@ -0,0 +1,255 @@
+/*
+Speed and Altitude [speedalt]
+Ver : 0.1
+*/
+
+var buf = Graphics.createArrayBuffer(240,120,2,{msb:true});
+/*
+Colour Pallet Idx
+0 : Background (black)
+1 : Speed/Alt
+2 : Units
+3 : Sats
+*/
+var img = {
+  width:buf.getWidth(),
+  height:buf.getHeight(),
+  bpp:2,
+  buffer:buf.buffer,
+  palette:new Uint16Array([0,0x4FE0,0xEFE0,0x07DB])
+};
+
+var mainmenu = {
+  "" : { "title" : "-- Units --" },
+  "default" : function() { setUnits(0,''); },
+  "Kph (spd)" : function() { setUnits(1,'kph'); },
+  "Knots (spd)" : function() { setUnits(1.852,'knots'); },
+  "Mph (spd)" : function() { setUnits(1.60934,'mph'); },
+  "m/s (spd)" : function() { setUnits(3.6,'m/s'); },
+  "Meters (alt)" : function() { setUnitsAlt(1,'m'); },
+  "Feet (alt)" : function() { setUnitsAlt(0.3048,'feet'); },
+  "Exit" : function() { exitMenu(); }, // remove the menu and restore
+};
+
+var lastFix = {fix:0,satellites:0};
+var mode = 's';     // s = Primary display speed. a = Altitude
+var multi = 0;      // Multiplier for speed unit conversions. 0 = use the locale values for speed
+var multi_alt = 1;  // Multiplier for altitude unit conversions. 
+var units = '';     // Displayed speed unit
+var units_alt = 'm'; // Displayed altitude units
+var btnToggle=false;        // ID of the toggle display button
+var btnMenu=false;        // ID of the menu button
+var inMenu = 0;
+var emulator = 1;    // 1 = running in emulator. Supplies test value;
+
+/*
+
+const storage = require('Storage');
+let settings;
+
+function updateSettings() {
+  storage.write('speedalt.json', settings);
+}
+
+function resetSettings() {
+  settings = {
+    day : 17,
+    month : 6,
+    year: 1981
+  };
+  updateSettings();
+}
+
+*/
+
+function drawFix(speed,units,sats,alt,alt_units) {
+
+  var str = '';
+  
+  // Size fonts to always maximise the display fit
+  var s;
+
+  // Primary Display
+  str = speed.toString();
+  if ( mode == 'a' ) str = alt.toString();
+  
+  s=40;    // Font size
+  if ( str.length <= 7 ) s=48;
+  if ( str.length <= 6 ) s=55;
+  if ( str.length <= 5 ) s=68;
+  if ( str.length <= 4 ) s=85;
+  if ( str.length <= 3 ) s=110;
+        
+  buf.setFontAlign(0,-1); //Centre 
+  buf.setColor(1);  
+
+  buf.setFontVector(s);
+  buf.drawString(str,110,0);
+    
+    // Primary Units
+  str = units;
+  if ( mode == 'a' ) str = alt_units;
+  buf.setFontAlign(1,-1,3); //right
+  buf.setColor(2);  
+  buf.setFontVector(25);
+  buf.drawString(str,210,0);
+
+  // Secondary Display
+  str = alt.toString();
+  if ( mode == 'a' ) str = speed.toString();
+
+  s=115;    // minor units X position
+  if ( str.length <= 7 ) s=120;
+  if ( str.length <= 6 ) s=105;
+  if ( str.length <= 5 ) s=87;
+  if ( str.length <= 4 ) s=70;
+  if ( str.length <= 3 ) s=55;
+  if ( str.length <= 2 ) s=40;
+  if ( str.length <= 1 ) s=25;
+  
+  buf.setFontAlign(-1,1); //left, bottom 
+  buf.setColor(1);  
+  buf.setFontVector(25);
+  buf.drawString(str,5,120);
+    
+  // Secondary Units
+  str = alt_units;
+  if ( mode == 'a' ) str = units;
+  buf.setFontAlign(-1,1); //left, bottom
+  buf.setColor(2);  
+  buf.setFontVector(20);
+  buf.drawString(str,s,120);
+  
+  
+  //Sats
+  buf.setFontAlign(1,1); //right, bottom
+  buf.setColor(3);  
+  buf.setFontVector(18);
+  buf.drawString(" Sats:"+sats,240,120);
+  
+}
+
+
+function drawNoFix(sats) {
+
+  buf.setFontAlign(0,0);
+  buf.setColor(3);  
+
+  buf.setFontVector(18);
+  buf.drawString(" Sats:"+sats,120,10);
+  
+  buf.setFontVector(25);
+  buf.drawString("Waiting for GPS",120,56);
+  
+}
+
+function onGPS(fix) {
+
+  lastFix = fix;
+  buf.clear();
+  
+  var m;
+
+  if (fix.fix || emulator) {
+    //==== Speed ====
+    // Default to locale speed units
+    if ( multi == 0 ) {
+      var strSpeed = require("locale").speed(fix.speed);
+      m = strSpeed.match(/([0-9,\.]+)(.*)/); // regex splits numbers from units
+
+      if ( emulator ) {
+        speed = '125';  //testing only
+        units = 'kph';
+      }
+      else {
+        speed = m[1];
+        units = m[2];
+      }
+    }
+    // Calculate for selected units
+    else {
+      speed = fix.speed;
+      if ( emulator ) speed = '100';
+      speed = Math.round(parseFloat(speed)/parseFloat(multi),0);
+    }
+    
+    // ==== Altitude ====
+    alt = fix.alt;
+    if ( emulator ) alt = '360';
+    alt = Math.round(parseFloat(alt)/parseFloat(multi_alt),0);
+    
+    drawFix(speed,units,fix.satellites,alt,units_alt);
+
+  } else {
+    drawNoFix(fix.satellites);
+  }
+  
+  g.reset();
+  g.drawImage(img,0,70);
+  g.flip();
+}
+
+function setUnits(m,u) {
+  multi = m;
+  units = u;
+
+  inMenu = 0;
+ 
+  E.showMenu(); // remove the menu
+  onGPS(lastFix);  // Back to Speed display
+}
+
+function setUnitsAlt(m,u) {
+  multi_alt = m;
+  units_alt = u;
+
+  inMenu = 0;
+
+  E.showMenu(); // remove the menu
+  onGPS(lastFix);  // Back to Speed display
+}
+
+function enterMenu() {
+  if ( inMenu ) return;
+  inMenu = 1;
+  E.showMenu(mainmenu);
+}
+
+function exitMenu() {
+  inMenu = 0;
+  E.showMenu(); 
+  onGPS(lastFix); // remove the menu and restore
+  
+}
+
+function toggleDisplay() {
+  if ( inMenu ) return;
+  if ( mode == 's' ) mode = 'a';
+  else mode = 's';
+  onGPS(lastFix);  // Back to Speed display
+}
+
+// How to disable these while in menu? Interim using inMenu flag.
+function setButtons(){
+  
+  // Touch screen to toggle display
+  btnToggle = setWatch(toggleDisplay, BTN4, {repeat:true,edge:"falling"});
+  btnToggle = setWatch(toggleDisplay, BTN5, {repeat:true,edge:"falling"});
+  
+  // Units menu
+  btnMenu = setWatch(enterMenu, BTN3,{repeat:true,edge:"falling"});
+
+ // setWatch(nextwp.bind(null,1), BTN3, {repeat:true,edge:"falling"});
+}
+
+g.clear();
+setUnitsAlt(0.3048,'feet');    // Default alt in feet
+
+onGPS(lastFix);
+Bangle.loadWidgets();
+Bangle.drawWidgets();
+
+Bangle.on('GPS', onGPS);
+Bangle.setGPSPower(1);
+
+setButtons();