From cf3654b0efdddc808196c4d943faf0cb63b096ea Mon Sep 17 00:00:00 2001
From: Teodor Ivanov <tivanov@datech.org>
Date: Sun, 3 Feb 2019 11:24:31 +0200
Subject: [PATCH] Added support for xy inputs (#11). Include RGB color in the
 output.

---
 index.html        |  4 ++++
 index.js          | 58 ++++++++++++++++++++++++++++++++++++++++++++++-
 package-lock.json | 13 +++++++++++
 package.json      |  3 ++-
 4 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/index.html b/index.html
index 634f3de..8f2e5fb 100644
--- a/index.html
+++ b/index.html
@@ -92,6 +92,8 @@ <h3>Outputs</h3>
      <dt>colormode <span class="property-type">string</span></dt>
      <dd>Indicates the color mode (cr - Color Temperature | hs - Hue and Saturation)</dd>
 
+     <dt>rgb <span class="property-type">array</span></dt>
+     <dd>The light color in RGB format</dd>
   </dl>
 </script>
 
@@ -152,5 +154,7 @@ <h3>Outputs</h3>
      <dt>colormode <span class="property-type">string</span></dt>
      <dd>Indicates the color mode (cr - Color Temperature | hs - Hue and Saturation)</dd>
 
+     <dt>rgb <span class="property-type">array</span></dt>
+     <dd>The light color in RGB format</dd>
   </dl>
 </script>
diff --git a/index.js b/index.js
index eaed8ca..03fb30a 100644
--- a/index.js
+++ b/index.js
@@ -324,6 +324,13 @@ module.exports = function(RED) {
 
     function setDeviceAttributes(id, attributes, context) {
 
+      if (attributes.xy !== undefined && attributes.xy !== null) {
+        var xy = attributes.xy;
+        var hsb = colorXYY2SHB(xy[0], xy[1], 100);
+        attributes.hue = hsb[0];
+        attributes.sat = hsb[1];
+      }
+
       var currentAttributes = getDeviceAttributes(id, context);
 
       for (var key in currentAttributes) {
@@ -350,11 +357,60 @@ module.exports = function(RED) {
     function payloadHandler(hubNode, deviceId) {
 
       var msg = getDeviceAttributes(deviceId, hubNode.context());
+      msg.rgb = colorSHB2RGB(msg.hue, msg.sat, 254);
       msg.payload = msg.on ? "on" : "off";
       msg.deviceid = deviceId;
-      msg.topic= "";
+      msg.topic = "";
 
       hubNode.send(msg);
     }
 
+    //
+    // Colors conversion
+    //
+    var colorConvert = require('color-convert');
+
+    function colorXYY2XYZ(xs, ys, yc){
+      var xc = xs * yc / ys;
+      var zc = (1 - xs - ys) * yc / ys;
+
+      return [xc, yc, zc];
+    }
+
+    function colorXYZ2SHV(x, y, z){
+      var hsv = colorConvert.xyz.hsv(x, y, z);
+
+      return hsv;
+    }
+
+    function colorSHV2HSB(h, s, v){
+      var hh = h / 360 * 65535;
+      var ss = s / 100 * 254;
+      var bb = v / 100 * 254;
+
+      return [hh, ss, bb]
+    }
+
+    function colorSHB2HSV(h, s, b){
+      var hh = h * 360 / 65535;
+      var ss = s * 100 / 254;
+      var vv = b * 100 / 254;
+
+      return [hh, ss, vv]
+    }
+
+    function colorXYY2SHB(xs, ys, yc){
+      var xyz = colorXYY2XYZ(xs, ys, yc);
+      var hsv = colorXYZ2SHV(xyz[0], xyz[1], xyz[2]);
+      var hsb = colorSHV2HSB(hsv[0], hsv[1], hsv[2]);
+
+      return hsb;
+    }
+
+    function colorSHB2RGB(h, s, b){
+      var hsv = colorSHB2HSV(h, s, b);
+      var rgb = colorConvert.hsv.rgb(hsv[0], hsv[1], hsv[2]);
+
+      return rgb;
+    }
 }
diff --git a/package-lock.json b/package-lock.json
index 4fbccb6..6dffa57 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -53,6 +53,19 @@
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
       "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg="
     },
+    "color-convert": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.0.tgz",
+      "integrity": "sha512-hzTicsCJIHdxih9+2aLR1tNGZX5qSJGRHDPVwSY26tVrEf55XNajLOBWz2UuWSIergszA09/bqnOiHyqx9fxQg==",
+      "requires": {
+        "color-name": "~1.1.4"
+      }
+    },
+    "color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
+    },
     "content-disposition": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
diff --git a/package.json b/package.json
index 5a72e74..81b75b8 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "stoppable": "^1.0.4",
     "mustache": "^3.0.1",
     "express": "^4.16.4",
-    "body-parser": "^1.18.3"
+    "body-parser": "^1.18.3",
+    "color-convert": "^2.0.0"
   }
 }