HUD.cc 55.8 KB
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/*=====================================================================

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QGroundControl Open Source Ground Control Station
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(c) 2009, 2010 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
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This file is part of the QGROUNDCONTROL project
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    QGROUNDCONTROL is free software: you can redistribute it and/or modify
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    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.

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    QGROUNDCONTROL is distributed in the hope that it will be useful,
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    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
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    along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
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======================================================================*/

/**
 * @file
 *   @brief Head Up Display (HUD)
 *
 *   @author Lorenz Meier <mavteam@student.ethz.ch>
 *
 */

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#include <QShowEvent>
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#include <QContextMenuEvent>
#include <QMenu>
#include <QDesktopServices>
#include <QFileDialog>
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#include <QDebug>
#include <cmath>
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#include <qmath.h>
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#include <limits>
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#include "UASManager.h"
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#include "UAS.h"
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#include "HUD.h"
#include "MG.h"
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#include "QGC.h"
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// Fix for some platforms, e.g. windows
#ifndef GL_MULTISAMPLE
#define GL_MULTISAMPLE  0x809D
#endif

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template<typename T>
inline bool isnan(T value)
{
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    return value != value;
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}

// requires #include <limits>
template<typename T>
inline bool isinf(T value)
{
    return std::numeric_limits<T>::has_infinity && (value == std::numeric_limits<T>::infinity() || (-1*value) == std::numeric_limits<T>::infinity());
}

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/**
 * @warning The HUD widget will not start painting its content automatically
 *          to update the view, start the auto-update by calling HUD::start().
 *
 * @param width
 * @param height
 * @param parent
 */
HUD::HUD(int width, int height, QWidget* parent)
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    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent),
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    uas(NULL),
    yawInt(0.0f),
    mode(tr("UNKNOWN MODE")),
    state(tr("UNKNOWN STATE")),
    fuelStatus(tr("00.0V (00m:00s)")),
    xCenterOffset(0.0f),
    yCenterOffset(0.0f),
    vwidth(200.0f),
    vheight(150.0f),
    vGaugeSpacing(50.0f),
    vPitchPerDeg(6.0f), ///< 4 mm y translation per degree)
    rawBuffer1(NULL),
    rawBuffer2(NULL),
    rawImage(NULL),
    rawLastIndex(0),
    rawExpectedBytes(0),
    bytesPerLine(1),
    imageStarted(false),
    receivedDepth(8),
    receivedChannels(1),
    receivedWidth(640),
    receivedHeight(480),
    defaultColor(QColor(70, 200, 70)),
    setPointColor(QColor(200, 20, 200)),
    warningColor(Qt::yellow),
    criticalColor(Qt::red),
    infoColor(QColor(20, 200, 20)),
    fuelColor(criticalColor),
    warningBlinkRate(5),
    refreshTimer(new QTimer(this)),
    noCamera(true),
    hardwareAcceleration(true),
    strongStrokeWidth(1.5f),
    normalStrokeWidth(1.0f),
    fineStrokeWidth(0.5f),
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    waypointName(""),
    roll(0.0f),
    pitch(0.0f),
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    yaw(0.0f),
    rollLP(0.0f),
    pitchLP(0.0f),
    yawLP(0.0f),
    yawDiff(0.0f),
    xPos(0.0),
    yPos(0.0),
    zPos(0.0),
    xSpeed(0.0),
    ySpeed(0.0),
    zSpeed(0.0),
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    lastSpeedUpdate(0),
    totalSpeed(0.0),
    totalAcc(0.0),
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    lat(0.0),
    lon(0.0),
    alt(0.0),
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    load(0.0f),
    offlineDirectory(""),
    nextOfflineImage(""),
    hudInstrumentsEnabled(true),
    videoEnabled(false),
    xImageFactor(1.0),
    yImageFactor(1.0)
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{
    // Set auto fill to false
    setAutoFillBackground(false);

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    // Set minimum size
    setMinimumSize(80, 60);
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    // Set preferred size
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
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    // Fill with black background
    QImage fill = QImage(width, height, QImage::Format_Indexed8);
    fill.setNumColors(3);
    fill.setColor(0, qRgb(0, 0, 0));
    fill.setColor(1, qRgb(0, 0, 0));
    fill.setColor(2, qRgb(0, 0, 0));
    fill.fill(0);

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    //QString imagePath = "/Users/user/Desktop/frame0000.png";
    //qDebug() << __FILE__ << __LINE__ << "template image:" << imagePath;
    //fill = QImage(imagePath);
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    //glImage = QGLWidget::convertToGLFormat(fill);
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    // Refresh timer
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    refreshTimer->setInterval(updateInterval);
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    //connect(refreshTimer, SIGNAL(timeout()), this, SLOT(update()));
    connect(refreshTimer, SIGNAL(timeout()), this, SLOT(paintHUD()));
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    // Resize to correct size and fill with image
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    //glDrawPixels(glImage.width(), glImage.height(), GL_RGBA, GL_UNSIGNED_BYTE, glImage.bits());
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    // Set size once
    //setFixedSize(fill.size());
    //setMinimumSize(fill.size());
    //setMaximumSize(fill.size());
    // Lock down the size
    //setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));

    fontDatabase = QFontDatabase();
    const QString fontFileName = ":/general/vera.ttf"; ///< Font file is part of the QRC file and compiled into the app
    const QString fontFamilyName = "Bitstream Vera Sans";
    if(!QFile::exists(fontFileName)) qDebug() << "ERROR! font file: " << fontFileName << " DOES NOT EXIST!";

    fontDatabase.addApplicationFont(fontFileName);
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    font = fontDatabase.font(fontFamilyName, "Roman", qMax(5,(int)(10.0f*scalingFactor*1.2f+0.5f)));
    QFont* fontPtr = &font;
    if (!fontPtr)
    {
        qDebug() << "ERROR! FONT NOT LOADED!";
    }
    else
    {
        if (font.family() != fontFamilyName) qDebug() << "ERROR! WRONG FONT LOADED: " << fontFamilyName;
    }
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    // Connect with UAS
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    connect(UASManager::instance(), SIGNAL(activeUASSet(UASInterface*)), this, SLOT(setActiveUAS(UASInterface*)));

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    createActions();

    if (UASManager::instance()->getActiveUAS() != NULL) setActiveUAS(UASManager::instance()->getActiveUAS());

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    setVisible(false);
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}

HUD::~HUD()
{
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    refreshTimer->stop();
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}

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QSize HUD::sizeHint() const
{
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    return QSize(width(), (width()*3.0f)/4);
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}

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void HUD::showEvent(QShowEvent* event)
{
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    // React only to internal (pre-display)
    // events
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    Q_UNUSED(event)
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    refreshTimer->start(updateInterval);
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}

void HUD::hideEvent(QHideEvent* event)
{
    // React only to internal (pre-display)
    // events
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    Q_UNUSED(event);
    refreshTimer->stop();
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}

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void HUD::contextMenuEvent (QContextMenuEvent* event)
{
    QMenu menu(this);
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    // Update actions
    enableHUDAction->setChecked(hudInstrumentsEnabled);
    enableVideoAction->setChecked(videoEnabled);

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    menu.addAction(enableHUDAction);
    //menu.addAction(selectHUDColorAction);
    menu.addAction(enableVideoAction);
    menu.addAction(selectOfflineDirectoryAction);
    //menu.addAction(selectVideoChannelAction);
    menu.exec(event->globalPos());
}

void HUD::createActions()
{
    enableHUDAction = new QAction(tr("Enable HUD"), this);
    enableHUDAction->setStatusTip(tr("Show the HUD instruments in this window"));
    enableHUDAction->setCheckable(true);
    enableHUDAction->setChecked(hudInstrumentsEnabled);
    connect(enableHUDAction, SIGNAL(triggered(bool)), this, SLOT(enableHUDInstruments(bool)));

    enableVideoAction = new QAction(tr("Enable Video Live feed"), this);
    enableVideoAction->setStatusTip(tr("Show the video live feed"));
    enableVideoAction->setCheckable(true);
    enableVideoAction->setChecked(videoEnabled);
    connect(enableVideoAction, SIGNAL(triggered(bool)), this, SLOT(enableVideo(bool)));

    selectOfflineDirectoryAction = new QAction(tr("Select image log"), this);
    selectOfflineDirectoryAction->setStatusTip(tr("Load previously logged images into simulation / replay"));
    connect(selectOfflineDirectoryAction, SIGNAL(triggered()), this, SLOT(selectOfflineDirectory()));
}

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/**
 *
 * @param uas the UAS/MAV to monitor/display with the HUD
 */
void HUD::setActiveUAS(UASInterface* uas)
{
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    if (this->uas != NULL)
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    {
        // Disconnect any previously connected active MAV
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        disconnect(this->uas, SIGNAL(attitudeChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateAttitude(UASInterface*, double, double, double, quint64)));
        disconnect(this->uas, SIGNAL(batteryChanged(UASInterface*, double, double, int)), this, SLOT(updateBattery(UASInterface*, double, double, int)));
        disconnect(this->uas, SIGNAL(statusChanged(UASInterface*,QString,QString)), this, SLOT(updateState(UASInterface*,QString)));
        disconnect(this->uas, SIGNAL(modeChanged(int,QString,QString)), this, SLOT(updateMode(int,QString,QString)));
        disconnect(this->uas, SIGNAL(heartbeat(UASInterface*)), this, SLOT(receiveHeartbeat(UASInterface*)));
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        disconnect(this->uas, SIGNAL(localPositionChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateLocalPosition(UASInterface*,double,double,double,quint64)));
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        disconnect(this->uas, SIGNAL(globalPositionChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateGlobalPosition(UASInterface*,double,double,double,quint64)));
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        disconnect(this->uas, SIGNAL(speedChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateSpeed(UASInterface*,double,double,double,quint64)));
        disconnect(this->uas, SIGNAL(waypointSelected(int,int)), this, SLOT(selectWaypoint(int, int)));
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        // Try to disconnect the image link
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        UAS* u = dynamic_cast<UAS*>(this->uas);
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        if (u)
        {
            disconnect(u, SIGNAL(imageStarted(quint64)), this, SLOT(startImage(quint64)));
        }
    }
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    if (uas)
    {
        // Now connect the new UAS
        // Setup communication
        connect(uas, SIGNAL(attitudeChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateAttitude(UASInterface*, double, double, double, quint64)));
        connect(uas, SIGNAL(batteryChanged(UASInterface*, double, double, int)), this, SLOT(updateBattery(UASInterface*, double, double, int)));
        connect(uas, SIGNAL(statusChanged(UASInterface*,QString,QString)), this, SLOT(updateState(UASInterface*,QString)));
        connect(uas, SIGNAL(modeChanged(int,QString,QString)), this, SLOT(updateMode(int,QString,QString)));
        connect(uas, SIGNAL(heartbeat(UASInterface*)), this, SLOT(receiveHeartbeat(UASInterface*)));

        connect(uas, SIGNAL(localPositionChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateLocalPosition(UASInterface*,double,double,double,quint64)));
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        connect(uas, SIGNAL(globalPositionChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateGlobalPosition(UASInterface*,double,double,double,quint64)));
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        connect(uas, SIGNAL(speedChanged(UASInterface*,double,double,double,quint64)), this, SLOT(updateSpeed(UASInterface*,double,double,double,quint64)));
        connect(uas, SIGNAL(waypointSelected(int,int)), this, SLOT(selectWaypoint(int, int)));

        // Try to connect the image link
        UAS* u = dynamic_cast<UAS*>(uas);
        if (u)
        {
            connect(u, SIGNAL(imageStarted(quint64)), this, SLOT(startImage(quint64)));
        }
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        // Set new UAS
        this->uas = uas;
    }
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}

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//void HUD::updateAttitudeThrustSetPoint(UASInterface* uas, double rollDesired, double pitchDesired, double yawDesired, double thrustDesired, quint64 msec)
//{
////    updateValue(uas, "roll desired", rollDesired, msec);
////    updateValue(uas, "pitch desired", pitchDesired, msec);
////    updateValue(uas, "yaw desired", yawDesired, msec);
////    updateValue(uas, "thrust desired", thrustDesired, msec);
//}
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void HUD::updateAttitude(UASInterface* uas, double roll, double pitch, double yaw, quint64 timestamp)
{
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    Q_UNUSED(uas);
    Q_UNUSED(timestamp);
    this->roll = roll;
    this->pitch = pitch;
    this->yaw = yaw;
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}

void HUD::updateBattery(UASInterface* uas, double voltage, double percent, int seconds)
{
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    Q_UNUSED(uas);
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    fuelStatus = tr("BAT [%1% | %2V] (%3:%4)").arg(percent, 2, 'f', 0, QChar('0')).arg(voltage, 4, 'f', 1, QChar('0')).arg(seconds/60, 2, 10, QChar('0')).arg(seconds%60, 2, 10, QChar('0'));
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    if (percent < 20.0f)
    {
        fuelColor = warningColor;
    }
    else if (percent < 10.0f)
    {
        fuelColor = criticalColor;
    }
    else
    {
        fuelColor = infoColor;
    }
}

void HUD::receiveHeartbeat(UASInterface*)
{
}

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void HUD::updateThrust(UASInterface* uas, double thrust)
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{
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    Q_UNUSED(uas);
    Q_UNUSED(thrust);
//    updateValue(uas, "thrust", thrust, MG::TIME::getGroundTimeNow());
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}

void HUD::updateLocalPosition(UASInterface* uas,double x,double y,double z,quint64 timestamp)
{
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    Q_UNUSED(uas);
    Q_UNUSED(timestamp);
    this->xPos = x;
    this->yPos = y;
    this->zPos = z;
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}

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void HUD::updateGlobalPosition(UASInterface* uas,double lat, double lon, double altitude, quint64 timestamp)
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{
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    Q_UNUSED(uas);
    Q_UNUSED(timestamp);
    this->lat = lat;
    this->lon = lon;
    this->alt = altitude;
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}

void HUD::updateSpeed(UASInterface* uas,double x,double y,double z,quint64 timestamp)
{
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    Q_UNUSED(uas);
    Q_UNUSED(timestamp);
    this->xSpeed = x;
    this->ySpeed = y;
    this->zSpeed = z;
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    double newTotalSpeed = sqrt(xSpeed*xSpeed + ySpeed*ySpeed + zSpeed*zSpeed);
    totalAcc = (newTotalSpeed - totalSpeed) / ((double)(lastSpeedUpdate - timestamp)/1000.0);
    totalSpeed = newTotalSpeed;
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}

/**
 * Updates the current system state, but only if the uas matches the currently monitored uas.
 *
 * @param uas the system the state message originates from
 * @param state short state text, displayed in HUD
 */
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void HUD::updateState(UASInterface* uas,QString state)
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{
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    // Only one UAS is connected at a time
    Q_UNUSED(uas);
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    this->state = state;
}

/**
 * Updates the current system mode, but only if the uas matches the currently monitored uas.
 *
 * @param uas the system the state message originates from
 * @param mode short mode text, displayed in HUD
 */
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void HUD::updateMode(int id,QString mode, QString description)
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{
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    // Only one UAS is connected at a time
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    Q_UNUSED(id);
    Q_UNUSED(description);
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    this->mode = mode;
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}

void HUD::updateLoad(UASInterface* uas, double load)
{
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    Q_UNUSED(uas);
    this->load = load;
    //updateValue(uas, "load", load, MG::TIME::getGroundTimeNow());
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}

/**
 * @param y coordinate in pixels to be converted to reference mm units
 * @return the screen coordinate relative to the QGLWindow origin
 */
float HUD::refToScreenX(float x)
{
    //qDebug() << "sX: " << (scalingFactor * x);
    return (scalingFactor * x);
}
/**
 * @param x coordinate in pixels to be converted to reference mm units
 * @return the screen coordinate relative to the QGLWindow origin
 */
float HUD::refToScreenY(float y)
{
    //qDebug() << "sY: " << (scalingFactor * y);
    return (scalingFactor * y);
}

/**
 * This functions works in the OpenGL view, which is already translated by
 * the x and y center offsets.
 *
 */
void HUD::paintCenterBackground(float roll, float pitch, float yaw)
{
    // Center indicator is 100 mm wide
    float referenceWidth = 70.0;
    float referenceHeight = 70.0;

    // HUD is assumed to be 200 x 150 mm
    // so that positions can be hardcoded
    // but can of course be scaled.

    double referencePositionX = vwidth / 2.0 - referenceWidth/2.0;
    double referencePositionY = vheight / 2.0 - referenceHeight/2.0;

    //this->width()/2.0+(xCenterOffset*scalingFactor), this->height()/2.0+(yCenterOffset*scalingFactor);

    setupGLView(referencePositionX, referencePositionY, referenceWidth, referenceHeight);

    // Store current position in the model view
    // the position will be restored after drawing
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();

    // Move to the center of the window
    glTranslatef(referenceWidth/2.0f,referenceHeight/2.0f,0);
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    // Move based on the yaw difference
    glTranslatef(yaw, 0.0f, 0.0f);

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    // Rotate based on the bank
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    glRotatef((roll/M_PI)*180.0f, 0.0f, 0.0f, 1.0f);
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    // Translate in the direction of the rotation based
    // on the pitch. On the 777, a pitch of 1 degree = 2 mm
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    //glTranslatef(0, ((-pitch/M_PI)*180.0f * vPitchPerDeg), 0);
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    glTranslatef(0.0f, (-pitch * vPitchPerDeg * 16.5f), 0.0f);
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    // Ground
    glColor3ub(179,102,0);

    glBegin(GL_POLYGON);
    glVertex2f(-300,-300);
    glVertex2f(-300,0);
    glVertex2f(300,0);
    glVertex2f(300,-300);
    glVertex2f(-300,-300);
    glEnd();

    // Sky
    glColor3ub(0,153,204);

    glBegin(GL_POLYGON);
    glVertex2f(-300,0);
    glVertex2f(-300,300);
    glVertex2f(300,300);
    glVertex2f(300,0);
    glVertex2f(-300,0);

    glEnd();
}

/**
 * Paint text on top of the image and OpenGL drawings
 *
 * @param text chars to write
 * @param color text color
 * @param fontSize text size in mm
 * @param refX position in reference units (mm of the real instrument). This is relative to the measurement unit position, NOT in pixels.
 * @param refY position in reference units (mm of the real instrument). This is relative to the measurement unit position, NOT in pixels.
 */
void HUD::paintText(QString text, QColor color, float fontSize, float refX, float refY, QPainter* painter)
{
    QPen prevPen = painter->pen();
    float pPositionX = refToScreenX(refX) - (fontSize*scalingFactor*0.072f);
    float pPositionY = refToScreenY(refY) - (fontSize*scalingFactor*0.212f);

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    QFont font("Bitstream Vera Sans");
    // Enforce minimum font size of 5 pixels
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    int fSize = qMax(5, (int)(fontSize*scalingFactor*1.26f));
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    font.setPixelSize(fSize);
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    QFontMetrics metrics = QFontMetrics(font);
    int border = qMax(4, metrics.leading());
    QRect rect = metrics.boundingRect(0, 0, width() - 2*border, int(height()*0.125),
                                      Qt::AlignLeft | Qt::TextWordWrap, text);
    painter->setPen(color);
    painter->setFont(font);
    painter->setRenderHint(QPainter::TextAntialiasing);
    painter->drawText(pPositionX, pPositionY,
                      rect.width(), rect.height(),
                      Qt::AlignCenter | Qt::TextWordWrap, text);
    painter->setPen(prevPen);
}

void HUD::initializeGL()
{
    bool antialiasing = true;

    // Antialiasing setup
    if(antialiasing)
    {
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        glEnable(GL_MULTISAMPLE);
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        glEnable(GL_BLEND);

        glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);

        glEnable(GL_POINT_SMOOTH);
        glEnable(GL_LINE_SMOOTH);

        glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
        glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
    }
    else
    {
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        glDisable(GL_BLEND);
        glDisable(GL_POINT_SMOOTH);
        glDisable(GL_LINE_SMOOTH);
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    }
}

/**
 * @param referencePositionX horizontal position in the reference mm-unit space
 * @param referencePositionY horizontal position in the reference mm-unit space
 * @param referenceWidth width in the reference mm-unit space
 * @param referenceHeight width in the reference mm-unit space
 */
void HUD::setupGLView(float referencePositionX, float referencePositionY, float referenceWidth, float referenceHeight)
{
    int pixelWidth  = (int)(referenceWidth * scalingFactor);
    int pixelHeight = (int)(referenceHeight * scalingFactor);
    // Translate and scale the GL view in the virtual reference coordinate units on the screen
    int pixelPositionX = (int)((referencePositionX * scalingFactor) + xCenterOffset);
    int pixelPositionY = this->height() - (referencePositionY * scalingFactor) + yCenterOffset - pixelHeight;

    //qDebug() << "Pixel x" << pixelPositionX << "pixelY" << pixelPositionY;
    //qDebug() << "xCenterOffset:" << xCenterOffset << "yCenterOffest" << yCenterOffset


    //The viewport is established at the correct pixel position and clips everything
    // out of the desired instrument location
    glViewport(pixelPositionX, pixelPositionY, pixelWidth, pixelHeight);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    // The ortho projection is setup in a way that so that the drawing is done in the
    // reference coordinate space
    glOrtho(0, referenceWidth, 0, referenceHeight, -1, 1);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    //glScalef(scaleX, scaleY, 1.0f);
}

void HUD::paintRollPitchStrips()
{
}


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void HUD::paintEvent(QPaintEvent *event)
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{
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    // Event is not needed
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    // the event is ignored as this widget
    // is refreshed automatically
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    Q_UNUSED(event);
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}

void HUD::paintHUD()
{
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    if (isVisible())
    {
        //    static quint64 interval = 0;
        //    qDebug() << "INTERVAL:" << MG::TIME::getGroundTimeNow() - interval << __FILE__ << __LINE__;
        //    interval = MG::TIME::getGroundTimeNow();
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#if (QGC_EVENTLOOP_DEBUG)
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        qDebug() << "EVENTLOOP:" << __FILE__ << __LINE__;
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#endif

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        // Read out most important values to limit hash table lookups
        // Low-pass roll, pitch and yaw
        rollLP = rollLP * 0.2f + 0.8f * roll;
        pitchLP = pitchLP * 0.2f + 0.8f * pitch;
        yawLP = yawLP * 0.2f + 0.8f * yaw;
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        // Translate for yaw
        const float maxYawTrans = 60.0f;
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        float newYawDiff = yawDiff;
        if (isinf(newYawDiff)) newYawDiff = yawDiff;
        if (newYawDiff > M_PI) newYawDiff = newYawDiff - M_PI;
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        if (newYawDiff < -M_PI) newYawDiff = newYawDiff + M_PI;
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        newYawDiff = yawDiff * 0.8 + newYawDiff * 0.2;
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        yawDiff = newYawDiff;
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        yawInt += newYawDiff;
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        if (yawInt > M_PI) yawInt = (float)M_PI;
        if (yawInt < -M_PI) yawInt = (float)-M_PI;
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        float yawTrans = yawInt * (float)maxYawTrans;
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        yawInt *= 0.6f;
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        if ((yawTrans < 5.0) && (yawTrans > -5.0)) yawTrans = 0;
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        // Negate to correct direction
        yawTrans = -yawTrans;
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        //qDebug() << "yaw translation" << yawTrans << "integral" << yawInt << "difference" << yawDiff << "yaw" << yaw;
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        // Update scaling factor
        // adjust scaling to fit both horizontally and vertically
        scalingFactor = this->width()/vwidth;
        double scalingFactorH = this->height()/vheight;
        if (scalingFactorH < scalingFactor) scalingFactor = scalingFactorH;
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        // OPEN GL PAINTING
        // Store model view matrix to be able to reset it to the previous state
        makeCurrent();
        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        // Fill with black background
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        if (videoEnabled)
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        {
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            if (nextOfflineImage != "" && QFileInfo(nextOfflineImage).exists())
            {
                qDebug() << __FILE__ << __LINE__ << "template image:" << nextOfflineImage;
                QImage fill = QImage(nextOfflineImage);
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                xImageFactor = width() / (float)fill.width();
                yImageFactor = height() / (float)fill.height();
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                glImage = QGLWidget::convertToGLFormat(fill);
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                // Reset to save load efforts
                nextOfflineImage = "";
            }
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            glRasterPos2i(0, 0);

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            glPixelZoom(xImageFactor, yImageFactor);
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            // Resize to correct size and fill with image
            glDrawPixels(glImage.width(), glImage.height(), GL_RGBA, GL_UNSIGNED_BYTE, glImage.bits());
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        }
        else
        {
            // Blue / brown background
            paintCenterBackground(roll, pitch, yawTrans);
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        }

        glMatrixMode(GL_MODELVIEW);
        glPopMatrix();

        // END OF OPENGL PAINTING

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        if (hudInstrumentsEnabled)
        {
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            //glEnable(GL_MULTISAMPLE);

            // QT PAINTING
            //makeCurrent();
            QPainter painter;
            painter.begin(this);
            painter.setRenderHint(QPainter::Antialiasing, true);
            painter.setRenderHint(QPainter::HighQualityAntialiasing, true);
            painter.translate((this->vwidth/2.0+xCenterOffset)*scalingFactor, (this->vheight/2.0+yCenterOffset)*scalingFactor);



            // COORDINATE FRAME IS NOW (0,0) at CENTER OF WIDGET


            // Draw all fixed indicators
            // MODE
            paintText(mode, infoColor, 2.0f, (-vwidth/2.0) + 10, -vheight/2.0 + 10, &painter);
            // STATE
            paintText(state, infoColor, 2.0f, (-vwidth/2.0) + 10, -vheight/2.0 + 15, &painter);
            // BATTERY
            paintText(fuelStatus, fuelColor, 2.0f, (-vwidth/2.0) + 10, -vheight/2.0 + 20, &painter);
            // Waypoint
            paintText(waypointName, defaultColor, 2.0f, (-vwidth/3.0) + 10, +vheight/3.0 + 15, &painter);
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            // YAW INDICATOR
            //
            //      .
            //    .   .
            //   .......
            //
            const float yawIndicatorWidth = 4.0f;
            const float yawIndicatorY = vheight/2.0f - 10.0f;
            QPolygon yawIndicator(4);
            yawIndicator.setPoint(0, QPoint(refToScreenX(0.0f), refToScreenY(yawIndicatorY)));
            yawIndicator.setPoint(1, QPoint(refToScreenX(yawIndicatorWidth/2.0f), refToScreenY(yawIndicatorY+yawIndicatorWidth)));
            yawIndicator.setPoint(2, QPoint(refToScreenX(-yawIndicatorWidth/2.0f), refToScreenY(yawIndicatorY+yawIndicatorWidth)));
            yawIndicator.setPoint(3, QPoint(refToScreenX(0.0f), refToScreenY(yawIndicatorY)));
            painter.setPen(defaultColor);
            painter.drawPolyline(yawIndicator);
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            // CENTER
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            // HEADING INDICATOR
            //
            //    __      __
            //       \/\/
            //
            const float hIndicatorWidth = 7.0f;
            const float hIndicatorY = -25.0f;
            const float hIndicatorYLow = hIndicatorY + hIndicatorWidth / 6.0f;
            const float hIndicatorSegmentWidth = hIndicatorWidth / 7.0f;
            QPolygon hIndicator(7);
            hIndicator.setPoint(0, QPoint(refToScreenX(0.0f-hIndicatorWidth/2.0f), refToScreenY(hIndicatorY)));
            hIndicator.setPoint(1, QPoint(refToScreenX(0.0f-hIndicatorWidth/2.0f+hIndicatorSegmentWidth*1.75f), refToScreenY(hIndicatorY)));
            hIndicator.setPoint(2, QPoint(refToScreenX(0.0f-hIndicatorSegmentWidth*1.0f), refToScreenY(hIndicatorYLow)));
            hIndicator.setPoint(3, QPoint(refToScreenX(0.0f), refToScreenY(hIndicatorY)));
            hIndicator.setPoint(4, QPoint(refToScreenX(0.0f+hIndicatorSegmentWidth*1.0f), refToScreenY(hIndicatorYLow)));
            hIndicator.setPoint(5, QPoint(refToScreenX(0.0f+hIndicatorWidth/2.0f-hIndicatorSegmentWidth*1.75f), refToScreenY(hIndicatorY)));
            hIndicator.setPoint(6, QPoint(refToScreenX(0.0f+hIndicatorWidth/2.0f), refToScreenY(hIndicatorY)));
            painter.setPen(defaultColor);
            painter.drawPolyline(hIndicator);
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            // SETPOINT
            const float centerWidth = 4.0f;
            painter.setPen(defaultColor);
            painter.setBrush(Qt::NoBrush);
            // TODO
            //painter.drawEllipse(QPointF(refToScreenX(qMin(10.0f, values.value("roll desired", 0.0f) * 10.0f)), refToScreenY(qMin(10.0f, values.value("pitch desired", 0.0f) * 10.0f))), refToScreenX(centerWidth/2.0f), refToScreenX(centerWidth/2.0f));
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            const float centerCrossWidth = 10.0f;
            // left
            painter.drawLine(QPointF(refToScreenX(-centerWidth / 2.0f), refToScreenY(0.0f)), QPointF(refToScreenX(-centerCrossWidth / 2.0f), refToScreenY(0.0f)));
            // right
            painter.drawLine(QPointF(refToScreenX(centerWidth / 2.0f), refToScreenY(0.0f)), QPointF(refToScreenX(centerCrossWidth / 2.0f), refToScreenY(0.0f)));
            // top
            painter.drawLine(QPointF(refToScreenX(0.0f), refToScreenY(-centerWidth / 2.0f)), QPointF(refToScreenX(0.0f), refToScreenY(-centerCrossWidth / 2.0f)));
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            // COMPASS
            const float compassY = -vheight/2.0f + 10.0f;
            QRectF compassRect(QPointF(refToScreenX(-5.0f), refToScreenY(compassY)), QSizeF(refToScreenX(10.0f), refToScreenY(5.0f)));
            painter.setBrush(Qt::NoBrush);
            painter.setPen(Qt::SolidLine);
            painter.setPen(defaultColor);
            painter.drawRoundedRect(compassRect, 2, 2);
            QString yawAngle;
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            //    const float yawDeg = ((values.value("yaw", 0.0f)/M_PI)*180.0f)+180.f;
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            // YAW is in compass-human readable format, so 0 - 360deg. This is normal in aviation, not -180 - +180.
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            const float yawDeg = ((yawLP/M_PI)*180.0f)+180.0f+180.0f;
            int yawCompass = static_cast<int>(yawDeg) % 360;
            yawAngle.sprintf("%03d", yawCompass);
            paintText(yawAngle, defaultColor, 3.5f, -4.3f, compassY+ 0.97f, &painter);
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            // CHANGE RATE STRIPS
            drawChangeRateStrip(-51.0f, -50.0f, 15.0f, -1.0f, 1.0f, -zSpeed, &painter);
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            // CHANGE RATE STRIPS
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            drawChangeRateStrip(49.0f, -50.0f, 15.0f, -1.0f, 1.0f, totalAcc, &painter);
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            // GAUGES
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            // Left altitude gauge
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            float gaugeAltitude;

            if (this->alt != 0)
            {
                gaugeAltitude = alt;
            }
            else
            {
                gaugeAltitude = -zPos;
            }

            drawChangeIndicatorGauge(-vGaugeSpacing, -15.0f, 10.0f, 2.0f, gaugeAltitude, defaultColor, &painter, false);
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            // Right speed gauge
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            drawChangeIndicatorGauge(vGaugeSpacing, -15.0f, 10.0f, 5.0f, totalSpeed, defaultColor, &painter, false);
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            // Waypoint name
            if (waypointName != "") paintText(waypointName, defaultColor, 2.0f, (-vwidth/3.0) + 10, +vheight/3.0 + 15, &painter);

            // MOVING PARTS


            painter.translate(refToScreenX(yawTrans), 0);

            // Rotate view and draw all roll-dependent indicators
            painter.rotate((rollLP/M_PI)* -180.0f);

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            painter.translate(0, (-pitchLP/(float)M_PI)* -180.0f * refToScreenY(1.8f));
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            //qDebug() << "ROLL" << roll << "PITCH" << pitch << "YAW DIFF" << valuesDot.value("roll", 0.0f);

            // PITCH
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            paintPitchLines(pitchLP, &painter);
            painter.end();
        }
        else
        {
            QPainter painter;
            painter.begin(this);
            painter.end();
        }
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        //glDisable(GL_MULTISAMPLE);

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        //glFlush();
    }
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}

/*
void HUD::paintGL()
{
    static float roll = 0.0;
    static float pitch = 0.0;
    static float yaw = 0.0;

    // Read out most important values to limit hash table lookups
    roll = roll * 0.5 + 0.5 * values.value("roll", 0.0f);
    pitch = pitch * 0.5 + 0.5 * values.value("pitch", 0.0f);
    yaw = yaw * 0.5 + 0.5 * values.value("yaw", 0.0f);
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    //qDebug() << __FILE__ << __LINE__ << "ROLL:" << roll << "PITCH:" << pitch << "YAW:" << yaw;


    // Update scaling factor
    // adjust scaling to fit both horizontally and vertically
    scalingFactor = this->width()/vwidth;
    double scalingFactorH = this->height()/vheight;
    if (scalingFactorH < scalingFactor) scalingFactor = scalingFactorH;

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    makeCurrent();
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    glClear(GL_COLOR_BUFFER_BIT);
    //if(!noCamera) glDrawPixels(glImage.width(), glImage.height(), GL_RGBA, GL_UNSIGNED_BYTE, glImage.bits());
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    //glDrawPixels(glImage.width(), glImage.height(), GL_RGBA, GL_UNSIGNED_BYTE, glImage.bits()); // FIXME Remove after testing
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    // Blue / Brown background
    if (noCamera) paintCenterBackground(roll, pitch, yaw);

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    glFlush();
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    //    // Store current GL model view
    //    glMatrixMode(GL_MODELVIEW);
    //    glPushMatrix();
    //
    //    // Setup GL view
    //    setupGLView(0.0f, 0.0f, vwidth, vheight);
    //
    //    // Restore previous view
    //    glPopMatrix();

    // Now draw QPainter overlay

    //painter.setRenderHint(QPainter::Antialiasing);

    // Position the coordinate frame according to the setup

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    makeOverlayCurrent();
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    QPainter painter(this);
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    //painter.setRenderHint(QPainter::Antialiasing, true);
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    //painter.setRenderHint(QPainter::HighQualityAntialiasing, true);
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    painter.translate((this->vwidth/2.0+xCenterOffset)*scalingFactor, (this->vheight/2.0+yCenterOffset)*scalingFactor);

    // COORDINATE FRAME IS NOW (0,0) at CENTER OF WIDGET


    // Draw all fixed indicators
    // MODE
    paintText(mode, infoColor, 2.0f, (-vwidth/2.0) + 10, -vheight/2.0 + 10, &painter);
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    // STATE
    paintText(state, infoColor, 2.0f, (-vwidth/2.0) + 10, -vheight/2.0 + 15, &painter);
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    // BATTERY
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    paintText(fuelStatus, fuelColor, 2.0f, (-vwidth/2.0) + 10, -vheight/2.0 + 20, &painter);
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    // Waypoint
    paintText(waypointName, defaultColor, 2.0f, (-vwidth/3.0) + 10, +vheight/3.0 + 15, &painter);

    // YAW INDICATOR
    //
    //      .
    //    .   .
    //   .......
    //
    const float yawIndicatorWidth = 4.0f;
    const float yawIndicatorY = vheight/2.0f - 10.0f;
    QPolygon yawIndicator(4);
    yawIndicator.setPoint(0, QPoint(refToScreenX(0.0f), refToScreenY(yawIndicatorY)));
    yawIndicator.setPoint(1, QPoint(refToScreenX(yawIndicatorWidth/2.0f), refToScreenY(yawIndicatorY+yawIndicatorWidth)));
    yawIndicator.setPoint(2, QPoint(refToScreenX(-yawIndicatorWidth/2.0f), refToScreenY(yawIndicatorY+yawIndicatorWidth)));
    yawIndicator.setPoint(3, QPoint(refToScreenX(0.0f), refToScreenY(yawIndicatorY)));
    painter.setPen(defaultColor);
    painter.drawPolyline(yawIndicator);

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    // CENTER

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    // HEADING INDICATOR
    //
    //    __      __
    //       \/\/
    //
    const float hIndicatorWidth = 7.0f;
    const float hIndicatorY = -25.0f;
    const float hIndicatorYLow = hIndicatorY + hIndicatorWidth / 6.0f;
    const float hIndicatorSegmentWidth = hIndicatorWidth / 7.0f;
    QPolygon hIndicator(7);
    hIndicator.setPoint(0, QPoint(refToScreenX(0.0f-hIndicatorWidth/2.0f), refToScreenY(hIndicatorY)));
    hIndicator.setPoint(1, QPoint(refToScreenX(0.0f-hIndicatorWidth/2.0f+hIndicatorSegmentWidth*1.75f), refToScreenY(hIndicatorY)));
    hIndicator.setPoint(2, QPoint(refToScreenX(0.0f-hIndicatorSegmentWidth*1.0f), refToScreenY(hIndicatorYLow)));
    hIndicator.setPoint(3, QPoint(refToScreenX(0.0f), refToScreenY(hIndicatorY)));
    hIndicator.setPoint(4, QPoint(refToScreenX(0.0f+hIndicatorSegmentWidth*1.0f), refToScreenY(hIndicatorYLow)));
    hIndicator.setPoint(5, QPoint(refToScreenX(0.0f+hIndicatorWidth/2.0f-hIndicatorSegmentWidth*1.75f), refToScreenY(hIndicatorY)));
    hIndicator.setPoint(6, QPoint(refToScreenX(0.0f+hIndicatorWidth/2.0f), refToScreenY(hIndicatorY)));
    painter.setPen(defaultColor);
    painter.drawPolyline(hIndicator);


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    // SETPOINT
    const float centerWidth = 4.0f;
    painter.setPen(defaultColor);
    painter.setBrush(Qt::NoBrush);
    // TODO
    //painter.drawEllipse(QPointF(refToScreenX(qMin(10.0f, values.value("roll desired", 0.0f) * 10.0f)), refToScreenY(qMin(10.0f, values.value("pitch desired", 0.0f) * 10.0f))), refToScreenX(centerWidth/2.0f), refToScreenX(centerWidth/2.0f));

    const float centerCrossWidth = 10.0f;
    // left
    painter.drawLine(QPointF(refToScreenX(-centerWidth / 2.0f), refToScreenY(0.0f)), QPointF(refToScreenX(-centerCrossWidth / 2.0f), refToScreenY(0.0f)));
    // right
    painter.drawLine(QPointF(refToScreenX(centerWidth / 2.0f), refToScreenY(0.0f)), QPointF(refToScreenX(centerCrossWidth / 2.0f), refToScreenY(0.0f)));
    // top
    painter.drawLine(QPointF(refToScreenX(0.0f), refToScreenY(-centerWidth / 2.0f)), QPointF(refToScreenX(0.0f), refToScreenY(-centerCrossWidth / 2.0f)));



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    // COMPASS
    const float compassY = -vheight/2.0f + 10.0f;
    QRectF compassRect(QPointF(refToScreenX(-5.0f), refToScreenY(compassY)), QSizeF(refToScreenX(10.0f), refToScreenY(5.0f)));
    painter.setBrush(Qt::NoBrush);
    painter.setPen(Qt::SolidLine);
    painter.setPen(defaultColor);
    painter.drawRoundedRect(compassRect, 2, 2);
    QString yawAngle;

    const float yawDeg = ((values.value("yaw", 0.0f)/M_PI)*180.0f)+180.f;
    //qDebug() << "YAW: " << yawDeg;
    yawAngle.sprintf("%03d", (int)yawDeg);
    paintText(yawAngle, defaultColor, 3.5f, -3.7f, compassY+ 0.9f, &painter);

    // CHANGE RATE STRIPS
    drawChangeRateStrip(-51.0f, -50.0f, 15.0f, -1.0f, 1.0f, valuesDot.value("z", 0.0f), &painter);

    // CHANGE RATE STRIPS
    drawChangeRateStrip(49.0f, -50.0f, 15.0f, -1.0f, 1.0f, valuesDot.value("x", 0.0f), &painter);

    // GAUGES

    // Left altitude gauge
    drawChangeIndicatorGauge(-vGaugeSpacing, -15.0f, 10.0f, 2.0f, -values.value("z", 0.0f), defaultColor, &painter, false);

    // Right speed gauge
    drawChangeIndicatorGauge(vGaugeSpacing, -15.0f, 10.0f, 5.0f, values.value("xSpeed", 0.0f), defaultColor, &painter, false);

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    glFlush();
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    // MOVING PARTS

    // Translate for yaw
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    const float maxYawTrans = 60.0f;
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    float yawDiff = valuesDot.value("yaw", 0.0f);
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    if (isinf(yawDiff)) yawDiff = 0.0f;
    if (yawDiff > M_PI) yawDiff = yawDiff - M_PI;
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    if (yawDiff < -M_PI) yawDiff = yawDiff + M_PI;
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    yawInt += yawDiff;

    if (yawInt > M_PI) yawInt = M_PI;
    if (yawInt < -M_PI) yawInt = -M_PI;

    float yawTrans = yawInt * (double)maxYawTrans;
    yawInt *= 0.6f;
    //qDebug() << "yaw translation" << yawTrans << "integral" << yawInt << "difference" << yawDiff << "yaw" << yaw << "asin(yawInt)" << asinYaw;

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    painter.translate(0, (pitch/M_PI)* -180.0f * refToScreenY(1.8));
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    painter.translate(refToScreenX(yawTrans), 0);

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    // Rotate view and draw all roll-dependent indicators
    painter.rotate((roll/M_PI)* -180.0f);

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    //qDebug() << "ROLL" << roll << "PITCH" << pitch << "YAW DIFF" << valuesDot.value("roll", 0.0f);
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    // PITCH

    paintPitchLines((pitch/M_PI)*180.0f, &painter);

    painter.end();

    glFlush();


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}*/

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/**
 * @param pitch pitch angle in degrees (-180 to 180)
 */
void HUD::paintPitchLines(float pitch, QPainter* painter)
{
    QString label;

    const float yDeg = vPitchPerDeg;
    const float lineDistance = 5.0f; ///< One pitch line every 10 degrees
    const float posIncrement = yDeg * lineDistance;
    float posY = posIncrement;
    const float posLimit = sqrt(pow(vwidth, 2.0f) + pow(vheight, 2.0f));

    const float offsetAbs = pitch * yDeg;

    float offset = pitch;
    if (offset < 0) offset = -offset;
    int offsetCount = 0;
    while (offset > lineDistance)
    {
        offset -= lineDistance;
        offsetCount++;
    }

    int iPos = (int)(0.5f + lineDistance); ///< The first line
    int iNeg = (int)(-0.5f - lineDistance); ///< The first line

    offset *= yDeg;


    painter->setPen(defaultColor);

    posY = -offsetAbs + posIncrement; //+ 100;// + lineDistance;

    while (posY < posLimit)
    {
        paintPitchLinePos(label.sprintf("%3d", iPos), 0.0f, -posY, painter);
        posY += posIncrement;
        iPos += (int)lineDistance;
    }



    // HORIZON
    //
    //    ------------    ------------
    //
    const float pitchWidth = 30.0f;
    const float pitchGap = pitchWidth / 2.5f;
    const QColor horizonColor = defaultColor;
    const float diagonal = sqrt(pow(vwidth, 2.0f) + pow(vheight, 2.0f));
    const float lineWidth = refLineWidthToPen(0.5f);

    // Left horizon
    drawLine(0.0f-diagonal, offsetAbs, 0.0f-pitchGap/2.0f, offsetAbs, lineWidth, horizonColor, painter);
    // Right horizon
    drawLine(0.0f+pitchGap/2.0f, offsetAbs, 0.0f+diagonal, offsetAbs, lineWidth, horizonColor, painter);



    label.clear();

    posY = offsetAbs  + posIncrement;


    while (posY < posLimit)
    {
        paintPitchLineNeg(label.sprintf("%3d", iNeg), 0.0f, posY, painter);
        posY += posIncrement;
        iNeg -= (int)lineDistance;
    }
}

void HUD::paintPitchLinePos(QString text, float refPosX, float refPosY, QPainter* painter)
{
    //painter->setPen(QPen(QBrush, normalStrokeWidth));

    const float pitchWidth = 30.0f;
    const float pitchGap = pitchWidth / 2.5f;
    const float pitchHeight = pitchWidth / 12.0f;
    const float textSize = pitchHeight * 1.1f;
    const float lineWidth = 0.5f;

    // Positive pitch indicator:
    //
    //      _______      _______
    //     |10                  |
    //

    // Left vertical line
    drawLine(refPosX-pitchWidth/2.0f, refPosY, refPosX-pitchWidth/2.0f, refPosY+pitchHeight, lineWidth, defaultColor, painter);
    // Left horizontal line
    drawLine(refPosX-pitchWidth/2.0f, refPosY, refPosX-pitchGap/2.0f, refPosY, lineWidth, defaultColor, painter);
    // Text left
    paintText(text, defaultColor, textSize, refPosX-pitchWidth/2.0 + 0.75f, refPosY + pitchHeight - 1.75f, painter);

    // Right vertical line
    drawLine(refPosX+pitchWidth/2.0f, refPosY, refPosX+pitchWidth/2.0f, refPosY+pitchHeight, lineWidth, defaultColor, painter);
    // Right horizontal line
    drawLine(refPosX+pitchWidth/2.0f, refPosY, refPosX+pitchGap/2.0f, refPosY, lineWidth, defaultColor, painter);
}

void HUD::paintPitchLineNeg(QString text, float refPosX, float refPosY, QPainter* painter)
{
    const float pitchWidth = 30.0f;
    const float pitchGap = pitchWidth / 2.5f;
    const float pitchHeight = pitchWidth / 12.0f;
    const float textSize = pitchHeight * 1.1f;
    const float segmentWidth = ((pitchWidth - pitchGap)/2.0f) / 7.0f; ///< Four lines and three gaps -> 7 segments

    const float lineWidth = 0.1f;

    // Negative pitch indicator:
    //
    //      -10
    //     _ _ _ _|     |_ _ _ _
    //
    //

    // Left vertical line
    drawLine(refPosX-pitchGap/2.0, refPosY, refPosX-pitchGap/2.0, refPosY-pitchHeight, lineWidth, defaultColor, painter);
    // Left horizontal line with four segments
    for (int i = 0; i < 7; i+=2)
    {
        drawLine(refPosX-pitchWidth/2.0+(i*segmentWidth), refPosY, refPosX-pitchWidth/2.0+(i*segmentWidth)+segmentWidth, refPosY, lineWidth, defaultColor, painter);
    }
    // Text left
    paintText(text, defaultColor, textSize, refPosX-pitchWidth/2.0f + 0.75f, refPosY + pitchHeight - 1.75f, painter);

    // Right vertical line
    drawLine(refPosX+pitchGap/2.0, refPosY, refPosX+pitchGap/2.0, refPosY-pitchHeight, lineWidth, defaultColor, painter);
    // Right horizontal line with four segments
    for (int i = 0; i < 7; i+=2)
    {
        drawLine(refPosX+pitchWidth/2.0f-(i*segmentWidth), refPosY, refPosX+pitchWidth/2.0f-(i*segmentWidth)-segmentWidth, refPosY, lineWidth, defaultColor, painter);
    }
}

void rotatePointClockWise(QPointF& p, float angle)
{
    // Standard 2x2 rotation matrix, counter-clockwise
    //
    //   |  cos(phi)   sin(phi) |
    //   | -sin(phi)   cos(phi) |
    //

    //p.setX(cos(angle) * p.x() + sin(angle) * p.y());
    //p.setY(-sin(angle) * p.x() + cos(angle) * p.y());


    p.setX(cos(angle) * p.x() + sin(angle)* p.y());
    p.setY((-1.0f * sin(angle) * p.x()) + cos(angle) * p.y());
}

float HUD::refLineWidthToPen(float line)
{
    return line * 2.50f;
}

/**
 * Rotate a polygon around a point
 *
 * @param p polygon to rotate
 * @param origin the rotation center
 * @param angle rotation angle, in radians
 * @return p Polygon p rotated by angle around the origin point
 */
void HUD::rotatePolygonClockWiseRad(QPolygonF& p, float angle, QPointF origin)
{
    // Standard 2x2 rotation matrix, counter-clockwise
    //
    //   |  cos(phi)   sin(phi) |
    //   | -sin(phi)   cos(phi) |
    //
    for (int i = 0; i < p.size(); i++)
    {
        QPointF curr = p.at(i);

        const float x = curr.x();
        const float y = curr.y();

        curr.setX(((cos(angle) * (x-origin.x())) + (-sin(angle) * (y-origin.y()))) + origin.x());
        curr.setY(((sin(angle) * (x-origin.x())) + (cos(angle) * (y-origin.y()))) + origin.y());
        p.replace(i, curr);
    }
}

void HUD::drawPolygon(QPolygonF refPolygon, QPainter* painter)
{
    // Scale coordinates
    QPolygonF draw(refPolygon.size());
    for (int i = 0; i < refPolygon.size(); i++)
    {
        QPointF curr;
        curr.setX(refToScreenX(refPolygon.at(i).x()));
        curr.setY(refToScreenY(refPolygon.at(i).y()));
        draw.replace(i, curr);
    }
    painter->drawPolygon(draw);
}

void HUD::drawChangeRateStrip(float xRef, float yRef, float height, float minRate, float maxRate, float value, QPainter* painter)
{
    QBrush brush(defaultColor, Qt::NoBrush);
    painter->setBrush(brush);
    QPen rectPen(Qt::SolidLine);
    rectPen.setWidth(0);
    rectPen.setColor(defaultColor);
    painter->setPen(rectPen);

    float scaledValue = value;

    // Saturate value
    if (value > maxRate) scaledValue = maxRate;
    if (value < minRate) scaledValue = minRate;

    //           x (Origin: xRef, yRef)
    //           -
    //           |
    //           |
    //           |
    //           =
    //           |
    //   -0.005 >|
    //           |
    //           -

    const float width = height / 8.0f;
    const float lineWidth = 0.5f;

    // Indicator lines
    // Top horizontal line
    drawLine(xRef, yRef, xRef+width, yRef, lineWidth, defaultColor, painter);
    // Vertical main line
    drawLine(xRef+width/2.0f, yRef, xRef+width/2.0f, yRef+height, lineWidth, defaultColor, painter);
    // Zero mark
    drawLine(xRef, yRef+height/2.0f, xRef+width, yRef+height/2.0f, lineWidth, defaultColor, painter);
    // Horizontal bottom line
    drawLine(xRef, yRef+height, xRef+width, yRef+height, lineWidth, defaultColor, painter);

    // Text
    QString label;
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    label.sprintf("< %+06.2f", value);
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    paintText(label, defaultColor, 3.0f, xRef+width/2.0f, yRef+height-((scaledValue - minRate)/(maxRate-minRate))*height - 1.6f, painter);
}

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//void HUD::drawSystemIndicator(float xRef, float yRef, int maxNum, float maxWidth, float maxHeight, QPainter* painter)
//{
//    Q_UNUSED(maxWidth);
//    Q_UNUSED(maxHeight);
//    if (values.size() > 0)
//    {
//        QString selectedKey = values.begin().key();
//        //   | | | | | |
//        //   | | | | | |
//        //   x speed: 2.54

//        // One column per value
//        QMapIterator<QString, float> value(values);

//        float x = xRef;
//        float y = yRef;

//        const float vspacing = 1.0f;
//        float width = 1.5f;
//        float height = 1.5f;
//        const float hspacing = 0.6f;

//        // TODO ensure that instrument stays smaller than maxWidth and maxHeight


//        int i = 0;
//        while (value.hasNext() && i < maxNum)
//        {
//            value.next();
//            QBrush brush(Qt::SolidPattern);


//            if (value.value() < 0.01f && value.value() > -0.01f)
//            {
//                brush.setColor(Qt::gray);
//            }
//            else if (value.value() > 0.01f)
//            {
//                brush.setColor(Qt::blue);
//            }
//            else
//            {
//                brush.setColor(Qt::yellow);
//            }

//            painter->setBrush(brush);
//            painter->setPen(Qt::NoPen);

//            // Draw current value colormap
//            painter->drawRect(refToScreenX(x), refToScreenY(y), refToScreenX(width), refToScreenY(height));

//            // Draw change rate colormap
//            painter->drawRect(refToScreenX(x), refToScreenY(y+height+hspacing), refToScreenX(width), refToScreenY(height));

//            // Draw mean value colormap
//            painter->drawRect(refToScreenX(x), refToScreenY(y+2.0f*(height+hspacing)), refToScreenX(width), refToScreenY(height));

//            // Add spacing
//            x += width+vspacing;

//            // Iterate
//            i++;
//        }

//        // Draw detail label
//        QString detail = "NO DATA AVAILABLE";

//        if (values.contains(selectedKey))
//        {
//            detail = values.find(selectedKey).key();
//            detail.append(": ");
//            detail.append(QString::number(values.find(selectedKey).value()));
//        }
//        paintText(detail, QColor(255, 255, 255), 3.0f, xRef, yRef+3.0f*(height+hspacing)+1.0f, painter);
//    }
//}
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void HUD::drawChangeIndicatorGauge(float xRef, float yRef, float radius, float expectedMaxChange, float value, const QColor& color, QPainter* painter, bool solid)
{
    // Draw the circle
    QPen circlePen(Qt::SolidLine);
    if (!solid) circlePen.setStyle(Qt::DotLine);
    circlePen.setWidth(refLineWidthToPen(0.5f));
    circlePen.setColor(defaultColor);
    painter->setBrush(Qt::NoBrush);
    painter->setPen(circlePen);
    drawCircle(xRef, yRef, radius, 200.0f, 170.0f, 1.0f, color, painter);

    QString label;
    label.sprintf("%05.1f", value);

    // Draw the value
    paintText(label, color, 4.5f, xRef-7.5f, yRef-2.0f, painter);

    // Draw the needle
    // Scale the rotation so that the gauge does one revolution
    // per max. change
    const float rangeScale = (2.0f * M_PI) / expectedMaxChange;
    const float maxWidth = radius / 10.0f;
    const float minWidth = maxWidth * 0.3f;

    QPolygonF p(6);

    p.replace(0, QPointF(xRef-maxWidth/2.0f, yRef-radius * 0.5f));
    p.replace(1, QPointF(xRef-minWidth/2.0f, yRef-radius * 0.9f));
    p.replace(2, QPointF(xRef+minWidth/2.0f, yRef-radius * 0.9f));
    p.replace(3, QPointF(xRef+maxWidth/2.0f, yRef-radius * 0.5f));
    p.replace(4, QPointF(xRef,               yRef-radius * 0.46f));
    p.replace(5, QPointF(xRef-maxWidth/2.0f, yRef-radius * 0.5f));

    rotatePolygonClockWiseRad(p, value*rangeScale, QPointF(xRef, yRef));

    QBrush indexBrush;
    indexBrush.setColor(defaultColor);
    indexBrush.setStyle(Qt::SolidPattern);
    painter->setPen(Qt::SolidLine);
    painter->setPen(defaultColor);
    painter->setBrush(indexBrush);
    drawPolygon(p, painter);
}

void HUD::drawLine(float refX1, float refY1, float refX2, float refY2, float width, const QColor& color, QPainter* painter)
{
    QPen pen(Qt::SolidLine);
    pen.setWidth(refLineWidthToPen(width));
    pen.setColor(color);
    painter->setPen(pen);
    painter->drawLine(QPoint(refToScreenX(refX1), refToScreenY(refY1)), QPoint(refToScreenX(refX2), refToScreenY(refY2)));
}

void HUD::drawEllipse(float refX, float refY, float radiusX, float radiusY, float startDeg, float endDeg, float lineWidth, const QColor& color, QPainter* painter)
{
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    Q_UNUSED(startDeg);
    Q_UNUSED(endDeg);
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    QPen pen(painter->pen().style());
    pen.setWidth(refLineWidthToPen(lineWidth));
    pen.setColor(color);
    painter->setPen(pen);
    painter->drawEllipse(QPointF(refToScreenX(refX), refToScreenY(refY)), refToScreenX(radiusX), refToScreenY(radiusY));
}

void HUD::drawCircle(float refX, float refY, float radius, float startDeg, float endDeg, float lineWidth, const QColor& color, QPainter* painter)
{
    drawEllipse(refX, refY, radius, radius, startDeg, endDeg, lineWidth, color, painter);
}

void HUD::resizeGL(int w, int h)
{
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, w, 0, h, -1, 1);
    glMatrixMode(GL_MODELVIEW);
    glPolygonMode(GL_FRONT, GL_FILL);
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    //FIXME
    paintHUD();
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}

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void HUD::selectWaypoint(int uasId, int id)
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{
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    Q_UNUSED(uasId);
    waypointName = tr("WP") + QString::number(id);
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}

void HUD::setImageSize(int width, int height, int depth, int channels)
{
    // Allocate raw image in correct size
    if (width != receivedWidth || height != receivedHeight || depth != receivedDepth || channels != receivedChannels || image == NULL)
    {
        // Set new size
        if (width > 0) receivedWidth  = width;
        if (height > 0) receivedHeight = height;
        if (depth > 1) receivedDepth = depth;
        if (channels > 1) receivedChannels = channels;

        rawExpectedBytes = (receivedWidth * receivedHeight * receivedDepth * receivedChannels) / 8;
        bytesPerLine = rawExpectedBytes / receivedHeight;
        // Delete old buffers if necessary
        rawImage = NULL;
        if (rawBuffer1 != NULL) delete rawBuffer1;
        if (rawBuffer2 != NULL) delete rawBuffer2;

        rawBuffer1 = (unsigned char*)malloc(rawExpectedBytes);
        rawBuffer2 = (unsigned char*)malloc(rawExpectedBytes);
        rawImage = rawBuffer1;
        // TODO check if old image should be deleted

        // Set image format
        // 8 BIT GREYSCALE IMAGE
        if (depth <= 8 && channels == 1)
        {
            image = new QImage(receivedWidth, receivedHeight, QImage::Format_Indexed8);
            // Create matching color table
            image->setNumColors(256);
            for (int i = 0; i < 256; i++)
            {
                image->setColor(i, qRgb(i, i, i));
                //qDebug() << __FILE__ << __LINE__ << std::hex << i;
            }

        }
        // 32 BIT COLOR IMAGE WITH ALPHA VALUES (#ARGB)
        else
        {
            image = new QImage(receivedWidth, receivedHeight, QImage::Format_ARGB32);
        }

        // Fill first channel of image with black pixels
        image->fill(0);
        glImage = QGLWidget::convertToGLFormat(*image);

        qDebug() << __FILE__ << __LINE__ << "Setting up image";

        // Set size once
        setFixedSize(receivedWidth, receivedHeight);
        setMinimumSize(receivedWidth, receivedHeight);
        setMaximumSize(receivedWidth, receivedHeight);
        // Lock down the size
        //setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
        //resize(receivedWidth, receivedHeight);
    }

}

void HUD::startImage(int imgid, int width, int height, int depth, int channels)
{
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    Q_UNUSED(imgid);
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    //qDebug() << "HUD: starting image (" << width << "x" << height << ", " << depth << "bits) with " << channels << "channels";

    // Copy previous image to screen if it hasn't been finished properly
    finishImage();

    // Reset image size if necessary
    setImageSize(width, height, depth, channels);
    imageStarted = true;
}

void HUD::finishImage()
{
    if (imageStarted)
    {
        commitRawDataToGL();
        imageStarted = false;
    }
}

void HUD::commitRawDataToGL()
{
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    qDebug() << __FILE__ << __LINE__ << "Copying raw data to GL buffer:" << rawImage << receivedWidth << receivedHeight << image->format();
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    if (image != NULL)
    {
        QImage::Format format = image->format();
        QImage* newImage = new QImage(rawImage, receivedWidth, receivedHeight, format);
        if (format == QImage::Format_Indexed8)
        {
            // Create matching color table
            newImage->setNumColors(256);
            for (int i = 0; i < 256; i++)
            {
                newImage->setColor(i, qRgb(i, i, i));
                //qDebug() << __FILE__ << __LINE__ << std::hex << i;
            }
        }

        glImage = QGLWidget::convertToGLFormat(*newImage);
        delete image;
        image = newImage;
        // Switch buffers
        if (rawImage == rawBuffer1)
        {
            rawImage = rawBuffer2;
            //qDebug() << "Now buffer 2";
        }
        else
        {
            rawImage = rawBuffer1;
            //qDebug() << "Now buffer 1";
        }
    }
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    update();
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}

void HUD::saveImage(QString fileName)
{
    image->save(fileName);
}

void HUD::saveImage()
{
    //Bring up popup
    QString fileName = "output.png";
    saveImage(fileName);
}

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void HUD::startImage(quint64 timestamp)
{
    if (videoEnabled && offlineDirectory != "")
    {
        // Load and diplay image file
        nextOfflineImage = QString(offlineDirectory + "/%1.bmp").arg(timestamp);
    }
}

void HUD::selectOfflineDirectory()
{
    QString fileName = QFileDialog::getExistingDirectory(this, tr("Select image directory"), QDesktopServices::storageLocation(QDesktopServices::DesktopLocation));
    if (fileName != "")
    {
        offlineDirectory = fileName;
    }
}

void HUD::enableHUDInstruments(bool enabled)
{
    hudInstrumentsEnabled = enabled;
}

void HUD::enableVideo(bool enabled)
{
    videoEnabled = enabled;
}

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void HUD::setPixels(int imgid, const unsigned char* imageData, int length, int startIndex)
{
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    Q_UNUSED(imgid);
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    //    qDebug() << "at" << __FILE__ << __LINE__ << ": Received startindex" << startIndex << "and length" << length << "(" << startIndex+length << "of" << rawExpectedBytes << "bytes)";

    if (imageStarted)
    {
        //if (rawLastIndex != startIndex) qDebug() << "PACKET LOSS!";

        if (startIndex+length > rawExpectedBytes)
        {
            qDebug() << "HUD: OVERFLOW! startIndex:" << startIndex << "length:" << length << "image raw size" << ((receivedWidth * receivedHeight * receivedChannels * receivedDepth) / 8) - 1;
        }
        else
        {
            memcpy(rawImage+startIndex, imageData, length);

            rawLastIndex = startIndex+length;

            // Check if we just reached the end of the image
            if (startIndex+length == rawExpectedBytes)
            {
                //qDebug() << "HUD: END OF IMAGE REACHED!";
                finishImage();
                rawLastIndex = 0;
            }
        }

        //        for (int i = 0; i < length; i++)
        //        {
        //            for (int j = 0; j < receivedChannels; j++)
        //            {
        //                unsigned int x = (startIndex+i) % receivedWidth;
        //                unsigned int y = (unsigned int)((startIndex+i) / receivedWidth);
        //                qDebug() << "Setting pixel" << x << "," << y << "to" << (unsigned int)*(rawImage+startIndex+i);
        //            }
        //        }
    }
}