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transform.js
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transform.js
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/**
* NodeRED Hue Bridge
* Copyright (C) 2018 Michael Jacobsen.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
module.exports = function(RED) {
"use strict";
/******************************************************************************************************************
*
*
*/
function TransformNode(config) {
RED.nodes.createNode(this, config);
this.typ = parseInt(config.typ);
this.timer = null;
this.transitiontime = 0;
this.bri_step = 0;
this.onoff = false;
this.bri = 0;
this.ct = null;
this.xy = null;
this.hue = null;
this.sat = null;
var node = this;
//
// respond to inputs from NodeRED
//
this.on('input', function (msg) {
RED.log.debug("TransformNode(input): payload = " + JSON.stringify(msg.payload));
var object = msg.payload;
if (object.hasOwnProperty('on')) {
node.onoff = object.on;
if (!object.on) {
if (node.timer !== null) {
clearInterval(node.timer);
node.timer = null;
}
msg.payload = {r: 0, g: 0, b: 0};
node.send(msg);
}
}
if (object.hasOwnProperty('colormode')) {
if (object.colormode === 'xy' && object.hasOwnProperty('xy')) {
RED.log.debug("TransformNode(input): colormode 'xy'");
node.xy = object.xy;
node.ct = null;
node.hue = null;
node.sat = null;
} else if (object.colormode === 'ct' && object.hasOwnProperty('ct')) {
RED.log.debug("TransformNode(input): colormode 'ct'");
node.xy = null;
node.ct = object.ct;
node.hue = null;
node.sat = null;
} else if (object.colormode === 'hs') {
RED.log.debug("TransformNode(input): colormode 'hs'");
node.xy = null;
node.ct = null;
if (object.hasOwnProperty('hue')) {
RED.log.debug("TransformNode(input): got hue");
node.hue = object.hue;
}
if (object.hasOwnProperty('sat')) {
RED.log.debug("TransformNode(input): got sat");
node.sat = object.sat;
}
}
}
if (object.hasOwnProperty('transitiontime') && node.onoff === true && object.transitiontime > 0) {
RED.log.debug("TransformNode(input): transitiontime = " + object.transitiontime);
var target_bri = object.bri * 0.0039370078740157; // scale from [0 - 254] to [0.0 - 1.0]
var bri_steps = (target_bri - node.bri) / object.transitiontime;
RED.log.debug("TransformNode(input): target_bri = " + target_bri);
RED.log.debug("TransformNode(input): bri_steps = " + bri_steps);
node.timer = setInterval(function(node, topic, target_bri, bri_steps) {
node.bri += bri_steps;
//RED.log.debug("TransformNode(transition): node.bri = " + node.bri);
if (node.bri >= target_bri) {
// transition completed
clearInterval(node.timer);
node.timer = null;
node.bri = target_bri > 1.0 ? 1.0 : target_bri;
RED.log.debug("TransformNode(transition): transition completed");
}
node.sendValues(node, topic);
}, 100, node, msg.topic, target_bri, bri_steps);
return;
}
if (object.hasOwnProperty('bri')) {
node.bri = object.bri * 0.0039370078740157; // scale from [0 - 254] to [0.0 - 1.0]
}
if (object.hasOwnProperty('effect')) {
//changedState.effect = object.effect;
}
if (node.onoff === false) {
return;
}
node.sendValues(node, msg.topic);
});
this.on('close', function(removed, done) {
if (removed) {
// this node has been deleted
} else {
// this node is being restarted
}
done();
});
//
//
//
this.sendValues = function(node, topic) {
var rgb = {
r: 0.0,
g: 0.0,
b: 0.0
};
if (node.xy !== null) {
RED.log.debug("TransformNode(sendValues): method xy");
rgb = node.transformXYZSimple(node.xy[0], node.xy[1]);
// adjust brightness
rgb.r = rgb.r * node.bri;
rgb.g = rgb.g * node.bri;
rgb.b = rgb.b * node.bri;
} else if (node.ct !== null) {
RED.log.debug("TransformNode(sendValues): method ct");
rgb = node.temperatureToRGB(node.ct);
// adjust brightness
rgb.r = rgb.r * node.bri;
rgb.g = rgb.g * node.bri;
rgb.b = rgb.b * node.bri;
} else if(node.hue !== null & node.sat !== null) {
RED.log.debug("TransformNode(sendValues): method hs");
rgb = node.hsv2rgb(node.hue / 65535, node.sat / 254, node.bri);
} else {
RED.log.debug("TransformNode(sendValues): no transform method available");
return;
}
if (node.typ === 1) { // scale output
rgb.r = Math.round(rgb.r * 255);
rgb.g = Math.round(rgb.g * 255);
rgb.b = Math.round(rgb.b * 255);
}
var msg = {
topic: topic,
payload: rgb
}
node.send(msg);
}
//
// https://developers.meethue.com/documentation/color-conversions-rgb-xy
//
this.transformXYZSimple = function(x, y) {
var z = 1.0 - x - y;
var Y = 1.0;
var X = (Y / y) * x;
var Z = (Y / y) * z;
// sRGB D65 conversion
var r = X * 1.656492 - Y * 0.354851 - Z * 0.255038;
var g = -X * 0.707196 + Y * 1.655397 + Z * 0.036152;
var b = X * 0.051713 - Y * 0.121364 + Z * 1.011530;
if (r > b && r > g && r > 1.0) {
// red is too big
g = g / r;
b = b / r;
r = 1.0;
} else if (g > b && g > r && g > 1.0) {
// green is too big
r = r / g;
b = b / g;
g = 1.0;
} else if (b > r && b > g && b > 1.0) {
// blue is too big
r = r / b;
g = g / b;
b = 1.0;
}
// Apply gamma correction
r = r <= 0.0031308 ? 12.92 * r : (1.0 + 0.055) * Math.pow(r, (1.0 / 2.4)) - 0.055;
g = g <= 0.0031308 ? 12.92 * g : (1.0 + 0.055) * Math.pow(g, (1.0 / 2.4)) - 0.055;
b = b <= 0.0031308 ? 12.92 * b : (1.0 + 0.055) * Math.pow(b, (1.0 / 2.4)) - 0.055;
if (r > b && r > g) {
// red is biggest
if (r > 1.0) {
g = g / r;
b = b / r;
r = 1.0;
}
} else if (g > b && g > r) {
// green is biggest
if (g > 1.0) {
r = r / g;
b = b / g;
g = 1.0;
}
} else if (b > r && b > g) {
// blue is biggest
if (b > 1.0) {
r = r / b;
g = g / b;
b = 1.0;
}
}
return {r:r, g:g, b:b};
}
//
this.ctToKelvin = function(ct) {
// Mirek = 1,000,000 / (color temperature in Kelvin).
// (color temperature in Kelvin) = 1,000,000 / Mirek
return 1000000 / ct;
}
//
this.temperatureToRGB = function(ct) {
//RED.log.debug("TemperatureToRGB(): ct = " + ct);
const XYZ_to_RGB = [
[ 3.24071, -0.969258, 0.0556352 ],
[ -1.53726, 1.87599, -0.203996 ],
[ -0.498571, 0.0415557, 1.05707]
];
var T = this.ctToKelvin(ct);
//RED.log.debug("TemperatureToRGB(): T = " + T);
var RGB = [0.0, 0.0, 0.0];
var c;
var xD, yD, X, Y, Z, max;
// Fit for CIE Daylight illuminant
if (T <= 4000) {
xD = 0.27475e9 / (T * T * T) - 0.98598e6 / (T * T) + 1.17444e3 / T + 0.145986;
} else if (T <= 7000) {
xD = -4.6070e9 / (T * T * T) + 2.9678e6 / (T * T) + 0.09911e3 / T + 0.244063;
} else {
xD = -2.0064e9 / (T * T * T) + 1.9018e6 / (T * T) + 0.24748e3 / T + 0.237040;
}
yD = -3 * xD * xD + 2.87 * xD - 0.275;
// Fit for Blackbody using CIE standard observer function at 2 degrees
//xD = -1.8596e9/(T*T*T) + 1.37686e6/(T*T) + 0.360496e3/T + 0.232632;
//yD = -2.6046*xD*xD + 2.6106*xD - 0.239156;
// Fit for Blackbody using CIE standard observer function at 10 degrees
//xD = -1.98883e9/(T*T*T) + 1.45155e6/(T*T) + 0.364774e3/T + 0.231136;
//yD = -2.35563*xD*xD + 2.39688*xD - 0.196035;
X = xD / yD;
Y = 1;
Z = (1 - xD - yD) / yD;
max = 0;
for (c = 0; c < 3; c++) {
RGB[c] = X * XYZ_to_RGB[0][c] + Y * XYZ_to_RGB[1][c] + Z * XYZ_to_RGB[2][c];
if (RGB[c] > max) {
max = RGB[c];
}
}
for (c = 0; c < 3; c++) {
RGB[c] = RGB[c] / max;
}
return {
r: RGB[0],
g: RGB[1],
b: RGB[2]
};
}
//
// https://stackoverflow.com/questions/3018313/algorithm-to-convert-rgb-to-hsv-and-hsv-to-rgb-in-range-0-255-for-both
// Mar 24 '16 at 19:57, Geremia
//
this.hsv2rgb = function(h, s, v) {
var r, g, b;
h = h * 360;
var P, Q, T, fract;
(h == 360.0) ? (h = 0.0) : (h /= 60.0);
fract = h - Math.floor(h);
P = v*(1. - s);
Q = v*(1. - s*fract);
T = v*(1. - s*(1. - fract));
if (0. <= h && h < 1.) {
r = v;
g = T;
b = P;
} else if (1. <= h && h < 2.) {
r = Q;
g = v;
b = P;
} else if (2. <= h && h < 3.) {
r = P;
g = v;
b = T;
} else if (3. <= h && h < 4.) {
r = P;
g = Q;
b = v;
} else if (4. <= h && h < 5.) {
r = T;
g = P;
b = v;
} else if (5. <= h && h < 6.) {
r = v;
g = P;
b = Q;
} else {
r = 0.0;
g = 0.0;
b = 0.0;
}
return {
r: r,
g: g,
b: b
};
}
/**
* Converts an HSL color value to RGB. Conversion formula
* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
* Assumes h, s, and l are contained in the set [0, 1] and
* returns r, g, and b in the set [0, 1].
*
* @param {number} h The hue
* @param {number} s The saturation
* @param {number} l The lightness
* @return {Object} The RGB representation
*/
this.hslToRgb = function(h, s, l) {
RED.log.debug("TransformNode(hslToRgb): h = " + h);
RED.log.debug("TransformNode(hslToRgb): s = " + s);
RED.log.debug("TransformNode(hslToRgb): l = " + l);
var r, g, b;
if(s == 0) {
r = g = b = l; // achromatic
} else {
var hue2rgb = function hue2rgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1/6) return p + (q - p) * 6 * t;
if (t < 1/2) return q;
if (t < 2/3) return p + (q - p) * (2/3 - t) * 6;
return p;
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1/3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1/3);
}
RED.log.debug("TransformNode(hslToRgb): r = " + r);
RED.log.debug("TransformNode(hslToRgb): g = " + g);
RED.log.debug("TransformNode(hslToRgb): b = " + b);
return {
r: r,
g: g,
b: b
};
//return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}
}
RED.nodes.registerType("huebridge-transform", TransformNode);
//
var scaleHue = function(hue) {
// scale from 0 - 65535 => 0.0 - 360.0
var v = hue / 182.04166;
return v > 360.0 ? 360.0 : v;
}
//
var scaleSaturation = function(sat) {
// scale from 0 - 254 => 0.0 - 100.0
var v = sat / 2.54;
return v > 100 ? 100 : v;
}
//
var scaleBrightness = function(bri) {
// scale from 1 to 254 => 0 - 100%
var v = Math.round(bri / 2.54);
return v > 100 ? 100 : v;
}
}