Add LEGO remote control

apps/legoremote/ChangeLog

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+0.01: New App!

apps/legoremote/README.md

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+# LEGO Remote control
+
+This app allows you to control LEGO models from Bangle.js
+
+Right now the only supported control device is the Mould King M-0006
+Bluetooth remote for LEGO Power Functions: http://www.espruino.com/LEGO+Power+Functions+Clone
+
+LEGO Power Functions does not have an official Bluetooth remote controller. Hopefully
+in the future this app will be able to support other types of remote (see below).
+
+## Usage
+
+Run the app, and ensure you're not connected to your watch via Bluetooth
+(a warning will pop up if so).
+
+Now press the arrow keys on the screen to control the robot.
+
+It is expected that the robot is controlled by two motors, one on the left
+side (connected to the `A` output) and one on the right (connected to the `B` output).
+
+## Future additions
+
+In the future it would be great to add:
+
+* Recording a series of movements and playing them back
+* Support for official LEGO bluetooth remotes (via [Pybricks](https://pybricks.com/))
+* Support for different robot styles and configurations
+* Using the Bangle's compass (or even GPS) to allow better robot control.

apps/legoremote/app-icon.js

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+require("heatshrink").decompress(atob("mEw4X/8H5A4NH/4ABJf4A/AFMC1Uq1QABhWqBYYJDAAegBYWqxWogWohQBCBYWpqsVqoABytVBYUC0u5rf5rf1q/xtQLBhWW/t//2/AYVKBYWX/u//z3B3//rRGCr/1/+H/v9/1/BYn2/lT+v6/oXDlF/4//9/78/5F4epv/X//f7/3+v9I4Wp38b/9v7//+4LD0P/HgN/7f/EgMoBYOlJ4IACDAP1O4QLH6ibCBYI7Br/+qf/iwLC1NIquhq2lquprWAWQVVoNVgtU0NVlQLCZQ7XDbgLWJEgOCdgLZBdwgA/AH4AaA"))

apps/legoremote/app.js

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+var lego = require("mouldking");
+lego.start();
+E.on('kill', () => {
+  // return to normal Bluetooth advertising
+  NRF.setAdvertising({},{showName:true});
+});
+// You must leave one second after 'start' to allow the remote to be paired
+
+var arrowIcon = atob("IiiBAAAAwAAAAPwAAAB/gAAAP/AAAB/+AAAP/8AAB//4AAP//wAA///gAH///AA///8AH///4A////wH////gf////D////8f////5/////n////+f////4AP/8AAA//wAAD//AAAP/8AAA//wAAD//AAAH/8AAAf/wAAB//AAAH/8AAAf/gAAB/+AAAH/4AAAf/gAAB/+AAAH/4AAAP/gAAA/+AAAD/wAAAD8AA");
+var controlState = "";
+
+Bangle.loadWidgets();
+Bangle.drawWidgets();
+var R = Bangle.appRect;
+// we'll divide up into 3x3
+function getBoxCoords(x,y) {
+  return {
+    x : R.x + R.w*x/3,
+    y : R.y + R.h*y/3
+  };
+}
+
+function draw() {
+  g.reset().clearRect(R);
+  var c, ninety = Math.PI/2;
+  var colOn = "#f00", colOff = g.theme.fg;
+  c = getBoxCoords(1.5, 0.5);
+  g.setColor(controlState=="up"?colOn:colOff).drawImage(arrowIcon,c.x,c.y,{rotate:0});
+  c = getBoxCoords(2.5, 1.5);
+  g.setColor(controlState=="right"?colOn:colOff).drawImage(arrowIcon,c.x,c.y,{rotate:ninety});
+  c = getBoxCoords(0.5, 1.5);
+  g.setColor(controlState=="left"?colOn:colOff).drawImage(arrowIcon,c.x,c.y,{rotate:-ninety});
+  c = getBoxCoords(1.5, 1.5);
+  g.setColor(controlState=="down"?colOn:colOff).drawImage(arrowIcon,c.x,c.y,{rotate:ninety*2});
+  if (NRF.getSecurityStatus().connected) {
+    c = getBoxCoords(1.5, 2.5);
+    g.setFontAlign(0,0).setFont("6x8").drawString("WARNING:\nBluetooth Connected\nYou must disconnect\nbefore LEGO will work",c.x,c.y);
+  }
+}
+draw();
+NRF.on('connect', draw);
+NRF.on('disconnect', draw);
+
+function setControlState(s) {
+  controlState = s;
+  var c = {};
+  var speed = 3;
+  if (s=="up") c={a:-speed,b:-speed};
+  if (s=="down") c={a:speed,b:speed};
+  if (s=="left") c={a:speed,b:-speed};
+  if (s=="right") c={a:-speed,b:speed};
+  draw();
+  lego.set(c);
+}
+
+Bangle.on('drag',e => {
+  var x = Math.floor(E.clip((e.x - R.x) * 3 / R.w,0,2.99));
+  var y = Math.floor(E.clip((e.y - R.y) * 3 / R.h,0,2.99));
+  if (!e.b) {
+    setControlState("");
+    return;
+  }
+  if (y==0) { // top row
+    if (x==1) setControlState("up");
+  } else if (y==1) {
+    if (x==0) setControlState("left");
+    if (x==1) setControlState("down");
+    if (x==2) setControlState("right");
+  }
+});

apps/legoremote/metadata.json

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+{ "id": "legoremote",
+  "name": "LEGO Remote control",
+  "shortName":"LEGO Remote",
+  "version":"0.01",
+  "description": "Use your Bangle.js to control LEGO models. See the README for compatibility",
+  "icon": "app.png",
+  "tags": "toy,lego,bluetooth",
+  "supports" : ["BANGLEJS2"],
+  "readme": "README.md",
+  "storage": [
+    {"name":"legoremote.app.js","url":"app.js"},
+    {"name":"legoremote.img","url":"app-icon.js","evaluate":true}
+  ]
+}