hyperion.ng/libsrc/leddevice/LedDevicePhilipsHue.cpp
Tim Niggemann ab5e17e105 State of all lights is saved and restored on switchOff().
Former-commit-id: 1ee26e8c01d90456424c1b5ea3f113dfd0ff6525
2014-04-28 14:32:37 +02:00

140 lines
4.2 KiB
C++
Executable File

// Local-Hyperion includes
#include "LedDevicePhilipsHue.h"
// jsoncpp includes
#include <json/json.h>
// qt includes
#include <QtCore/qmath.h>
#include <QUrl>
#include <QHttpRequestHeader>
#include <QEventLoop>
LedDevicePhilipsHue::LedDevicePhilipsHue(const std::string& output) :
host(output.c_str()), username("newdeveloper") {
http = new QHttp(host);
}
LedDevicePhilipsHue::~LedDevicePhilipsHue() {
delete http;
}
int LedDevicePhilipsHue::write(const std::vector<ColorRgb> & ledValues) {
// Save light states if not done before.
if (!statesSaved()) {
saveStates(ledValues.size());
}
// Iterate through colors and set light states.
unsigned int lightId = 1;
for (const ColorRgb& color : ledValues) {
float x, y, b;
// Scale colors from [0, 255] to [0, 1] and convert to xy space.
rgbToXYBrightness(color.red / 255.0f, color.green / 255.0f, color.blue / 255.0f, x, y, b);
// Send adjust color command in JSON format.
put(getStateRoute(lightId), QString("{\"xy\": [%1, %2]}").arg(x).arg(y));
// Send brightness color command in JSON format.
put(getStateRoute(lightId), QString("{\"bri\": %1}").arg(qRound(b * 255.0f)));
// Next light id.
lightId++;
}
return 0;
}
int LedDevicePhilipsHue::switchOff() {
// If light states have been saved before, ...
if (statesSaved()) {
// ... restore them.
restoreStates();
}
return 0;
}
void LedDevicePhilipsHue::put(QString route, QString content) {
QString url = QString("/api/%1/%2").arg(username).arg(route);
QHttpRequestHeader header("PUT", url);
header.setValue("Host", host);
header.setValue("Accept-Encoding", "identity");
header.setValue("Content-Length", QString("%1").arg(content.size()));
http->setHost(host);
http->request(header, content.toAscii());
}
QByteArray LedDevicePhilipsHue::get(QString route) {
QString url = QString("/api/%1/%2").arg(username).arg(route);
// Event loop to block until request finished.
QEventLoop loop;
// Connect requestFinished signal to quit slot of the loop.
loop.connect(http, SIGNAL(requestFinished(int, bool)), SLOT(quit()));
// Perfrom request
http->get(url);
// Go into the loop until the request is finished.
loop.exec();
// Read all data of the response.
return http->readAll();
}
QString LedDevicePhilipsHue::getStateRoute(unsigned int lightId) {
return QString("lights/%1/state").arg(lightId);
}
QString LedDevicePhilipsHue::getRoute(unsigned int lightId) {
return QString("lights/%1").arg(lightId);
}
void LedDevicePhilipsHue::saveStates(unsigned int nLights) {
// Clear saved light states.
states.clear();
// Use json parser to parse reponse.
Json::Reader reader;
Json::FastWriter writer;
// Iterate lights.
for (unsigned int i = 0; i < nLights; i++) {
// Read the response.
QByteArray response = get(getRoute(i + 1));
// Parse JSON.
Json::Value state;
if (!reader.parse(QString(response).toStdString(), state)) {
// Error occured, break loop.
break;
}
// Save state object.
states.push_back(QString(writer.write(state["state"]).c_str()));
}
}
void LedDevicePhilipsHue::restoreStates() {
unsigned int lightId = 1;
for (QString state : states) {
put(getStateRoute(lightId), state);
lightId++;
}
// Clear saved light states.
states.clear();
}
bool LedDevicePhilipsHue::statesSaved() {
return !states.empty();
}
void LedDevicePhilipsHue::rgbToXYBrightness(float red, float green, float blue, float& x, float& y, float& brightness) {
// Apply gamma correction.
red = (red > 0.04045f) ? qPow((red + 0.055f) / (1.0f + 0.055f), 2.4f) : (red / 12.92f);
green = (green > 0.04045f) ? qPow((green + 0.055f) / (1.0f + 0.055f), 2.4f) : (green / 12.92f);
blue = (blue > 0.04045f) ? qPow((blue + 0.055f) / (1.0f + 0.055f), 2.4f) : (blue / 12.92f);
// Convert to XYZ space.
float X = red * 0.649926f + green * 0.103455f + blue * 0.197109f;
float Y = red * 0.234327f + green * 0.743075f + blue * 0.022598f;
float Z = red * 0.0000000f + green * 0.053077f + blue * 1.035763f;
// Convert to x,y space.
x = X / (X + Y + Z);
y = Y / (X + Y + Z);
if (isnan(x)) {
x = 0.0f;
}
if (isnan(y)) {
y = 0.0f;
}
// Brightness is simply Y in the XYZ space.
brightness = Y;
}