Working implementation of drivers, and drawing application. Things light up!

.gitignore

@@ -1,3 +1,6 @@
+# Application data
+config.json
+
 # Logs
 logs
 *.log

README.md

@@ -1,5 +1,7 @@
 NEEDS BETTER README!
 
+Make sure you are on a recent nodejs version. Raspbian has old version. Use nodesource ;).
+
 npm install
 
 node pixdisp.js

config.example.json

@@ -0,0 +1,14 @@
+{
+	"bindAddr": "0.0.0.0",
+	"bindPort": 8080,
+
+	"driver": "dummy",
+
+	"matrix": {
+		"width": 16,
+		"height": 16,
+		"brightness": 1,
+		"flipHorizontal": false,
+		"flipVertical": false
+	}
+}

controllers/apicontroller.js

@@ -0,0 +1,67 @@
+"use strict";
+
+class ApiController {
+
+	constructor( server, driver ) {
+
+		this.server = server;
+		this.driver = driver;
+
+		this.server.post( { path: '/api/writecanvas' }, this.writecanvas.bind( this ) );
+		this.server.get( { path: '/api/write' }, this.write.bind( this ) );
+		this.server.get( { path: '/api/setpixel/:x/:y/:r/:g/:b' }, this.setPixel.bind( this ) );
+
+	}
+
+	writecanvas( request, resource, next ) {
+
+		this.driver.clearMatrix();
+
+		resource.setHeader( 'Access-Control-Allow-Origin', '*' );
+
+		let data = JSON.parse( request.params.data );
+
+		for ( let obj of data) {
+			this.driver.setPixel( obj.y, obj.x, obj.r, obj.g, obj.b );
+		}
+
+		let buffer = this.driver.getBuffer();
+		this.driver.write( buffer );
+
+		resource.json( 200, { 'msg': 'Ok' } );
+		return next();
+
+	}
+
+	write( request, resource, next ) {
+
+		resource.setHeader( 'Access-Control-Allow-Origin', '*' );
+
+		let buffer = this.driver.getBuffer();
+		this.driver.write( buffer );
+
+		resource.json( 200, { 'msg': 'Ok' } );
+		return next();
+
+	}
+
+	setPixel( request, resource, next ) {
+
+		resource.setHeader( 'Access-Control-Allow-Origin', '*' );
+
+		this.driver.setPixel(
+			request.params.x,
+			request.params.y,
+			request.params.r,
+			request.params.g,
+			request.params.b
+		);
+
+		resource.json( 200, { 'msg': 'Ok' } );
+		return next();
+
+	}
+
+}
+
+exports.ApiController = ApiController;

drivers/driver.js

@@ -10,6 +10,9 @@ class Driver {
 		this.setSize( 16, 16 );
 		this.setBrightness( 1 );
 
+		this.flipHorizontal = false;
+		this.flipVertical = false;
+
 	}
 
 	/**
@@ -19,7 +22,7 @@ class Driver {
 		this.width = w;
 		this.height = h;
 
-		this.createMatrix();
+		this.clearMatrix();
 	}
 
 	/**
@@ -84,6 +87,8 @@ class Driver {
 	 * @return {Buffer}
 	 */
 	getBuffer() {
+		this.flipMatrix( this.flipHorizontal, this.flipVertical );
+
 		let buffer = new Buffer( this.width * this.height * 3 );
 
 		let size = this.getSize();
@@ -100,22 +105,38 @@ class Driver {
 		return buffer;
 	}
 
+	/**
+	 * Write output to the device. Implement at driver level.
+	 */
 	write( buffer ) {
 		console.log( 'Driver should implement this' );
 	}
 
+	/**
+	 * Flip the matrix along it's axis.
+	 */
+	flipMatrix( horizontal, vertical ) {
+		if ( horizontal === true ) {
+			for ( let i = 0; i < this.matrix.length; i++ ) {
+				this.matrix[ i ].reverse();
+			}
+		}
+
+		if ( vertical === true ) {
+			this.matrix.reverse();
+		}
+	}
+
 	/**
 	 * Create the internal frame
 	 */
-	createMatrix() {
+	clearMatrix() {
 		this.matrix = [];
 
-		let size = this.getSize();
-
-		for ( let y = 0; y < size.height; y++ ) {
+		for ( let y = 0; y < this.height; y++ ) {
 			this.matrix.push( [] );
 
-			for ( let x = 0; x < size.width; x++  ) {
+			for ( let x = 0; x < this.width; x++  ) {
 				this.matrix[ y ].push( {
 					r: 0,
 					g: 0,

drivers/driverfactory.js

@@ -0,0 +1,40 @@
+"use strict";
+
+class DriverFactory {
+	constructor() {
+	}
+
+	createFromConfig( config ) {
+
+		let driver;
+
+		switch ( config.driver.toLowerCase() ) {
+
+			default:
+				console.warn( "Unknown driver defaulting to Dummy" );
+
+			case "dummy":
+				let { Dummy } = require( './dummy' );
+				driver = new Dummy();
+			break;
+
+			case "pimoroniunicorn":
+				let { PimoroniUnicorn } = require( './pimoroniunicorn' );
+				driver = new PimoroniUnicorn();
+			break;
+
+		}
+
+		driver.setSize( config.matrix.width, config.matrix.height );
+		driver.setBrightness( config.matrix.brightness );
+
+		driver.flipHorizontal = config.matrix.flipHorizontal;
+		driver.flipVertical = config.matrix.flipVertical;
+
+		return driver;
+
+	}
+
+}
+
+exports.DriverFactory = DriverFactory;

drivers/dummy.js

@@ -0,0 +1,15 @@
+"use strict";
+
+let { Driver } = require( './driver' );
+
+class Dummy extends Driver {
+	constructor() {
+		super();
+	}
+
+	write( buffer ) {
+		console.log( buffer );
+	}
+}
+
+exports.Dummy = Dummy;

drivers/pimoroniunicorn.js

@@ -2,7 +2,7 @@
 
 let { Driver } = require( './driver' );
 
-class UnicornHatHD extends Driver {
+class PimoroniUnicorn extends Driver {
 	constructor() {
 		super();
 
@@ -26,4 +26,4 @@ class UnicornHatHD extends Driver {
 	}
 }
 
-exports.UnicornHatHD = UnicornHatHD;
+exports.PimoroniUnicorn = PimoroniUnicorn;

pixdisp.js

@@ -1,18 +1,36 @@
 'use strict';
 
-let { UnicornHatHD } = require( './drivers/unicornhathd' );
+let fs = require( 'fs' );
+let config;
+let api;
+
+if ( fs.existsSync( 'config.json' ) ) {
+    let contents = fs.readFileSync( 'config.json' );
+    config = JSON.parse( contents );
+} else {
+    let contents = fs.readFileSync( 'config.example.json' );
+    config = JSON.parse( contents );
+}
+
+let driver;
+let { DriverFactory } = require( './drivers/driverfactory' );
+let driverFactory = new DriverFactory();
+
+let { ApiController } = require( './controllers/apicontroller' );
 
 let restify = require( 'restify' );
 
-let bindAddr = '0.0.0.0';
-let bindPort = 8080;
+let bindAddr = config.bindAddr;
+let bindPort = config.bindPort;
 
 let server = restify.createServer( {
 	handleUpgrades: true
 } );
 
 server.use( restify.plugins.queryParser() );
-server.use( restify.plugins.bodyParser() );
+server.use( restify.plugins.bodyParser( {
+    mapParams: true
+} ) );
 server.use( restify.plugins.jsonp() );
 server.use( restify.plugins.gzipResponse() );
 server.use( restify.plugins.throttle(
@@ -23,6 +41,11 @@ server.use( restify.plugins.throttle(
     }
 ));
 
+driver = driverFactory.createFromConfig( config );
+driver.write( driver.getBuffer() );
+
+api = new ApiController( server, driver );
+
 server.get(/.*/, restify.plugins.serveStatic({
 
     'directory': 'www',
@@ -37,12 +60,4 @@ server.listen( bindPort, bindAddr, function() {
     console.log( '%s listening at %s ', server.name , server.url );
     console.log( 'Ready.' );
 
-    // Some test code
-    let driver = new UnicornHatHD();
-    driver.setPixel( 1, 1, 255, 0, 0 );
-    driver.setPixel( 5, 5, 255, 0, 255 );
-
-    let buffer = driver.getBuffer();
-    driver.write( buffer );
-
 });

www/index.html

@@ -19,10 +19,7 @@
         </div>
     </section>
     <section class="section view">
-        <a class="button is-small is-link">Load current</a>
-        <a class="button is-small is-link">Capture camera</a>
-        <a class="button is-small is-link">Browse history</a>
-        <a class="button is-small is-success">Submit</a>
+        <a class="button is-small is-success" id="submitImage">Submit</a>
         <br /><br />
         <div class="columns">
             <div class="column is-half" id="canvasHolder">

www/js/app.js

@@ -18,6 +18,7 @@ class App
 		holder.appendChild( canvas );
 
 		canvas.addEventListener( 'click', this.handleCanvas );
+		document.getElementById( 'submitImage' ).addEventListener( 'click', this.submitCanvas );
 
 		this.canvas = canvas;
 		this.context = canvas.getContext( '2d' );
@@ -118,6 +119,42 @@ class App
 
 	}
 
+	submitCanvas( ev ) {
+
+		if ( ev.preventDefault ) {
+			ev.preventDefault();
+		}
+
+		let imageData = app.context.getImageData( 0, 0, app.canvas.width, app.canvas.height );
+		let request = new XMLHttpRequest();
+
+		request.open( 'POST', '/api/writecanvas', true );
+		request.setRequestHeader( 'Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8' );
+
+		let obj = [];
+		for ( let x = 0; x < app.canvas.width; x++ ) {
+			for ( let y = 0; y < app.canvas.height; y++ ) {
+				let index = ( y * app.canvas.width + x ) * 4;
+				let r = imageData.data[ index ];
+				let g = imageData.data[ index + 1 ];
+				let b = imageData.data[ index + 2 ];
+
+				if ( r > 0 || g > 0 || b > 0 ) {
+					obj.push( {
+						x: x,
+						y: y,
+						r: r,
+						g: g,
+						b: b
+					} )
+				}
+			}
+		}
+
+		obj = encodeURI( 'data=' + JSON.stringify( obj ) );
+		request.send( obj );
+	}
+
 }
 
 let app = new App();