File indexing completed on 2024-05-19 16:37:07

 /*
     SPDX-FileCopyrightText: 2006-2009 John Tapsell <tapsell@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 */
 
 #ifdef GRAPHICS_SIGNAL_PLOTTER
 #define KSignalPlotter KGraphicsSignalPlotter
 #define KSignalPlotterPrivate KGraphicsSignalPlotterPrivate
 #include "kgraphicssignalplotter.h"
 #else
 #undef KSignalPlotter
 #undef KSignalPlotterPrivate
 #include "ksignalplotter.h"
 #endif
 
 #include "ksignalplotter_debug.h"
 #include "ksignalplotter_p.h"
 
 #include <QDebug>
 #include <QEvent>
 #include <QPaintEvent>
 #include <QPainter>
 #include <QPainterPath>
 #include <QPixmap>
 
 #ifdef GRAPHICS_SIGNAL_PLOTTER
 #include <QGraphicsSceneResizeEvent>
 #include <QStyleOptionGraphicsItem>
 #endif
 
 #include <cmath>
 #include <kiconloader.h>
 #include <limits>
 
 #ifdef SVG_SUPPORT
 #include <Plasma/Svg>
 #include <Plasma/Theme>
 #endif
 
 #define VERTICAL_LINE_OFFSET 1
 // Never store less 1000 samples if not visible.  This is kinda arbitrary
 #define NUM_SAMPLES_WHEN_INVISIBLE ((uint)1000)
 
 #ifdef GRAPHICS_SIGNAL_PLOTTER
 KGraphicsSignalPlotter::KGraphicsSignalPlotter(QGraphicsItem *parent)
     : QGraphicsWidget(parent)
     , d(new KGraphicsSignalPlotterPrivate(this))
 #else
 KSignalPlotter::KSignalPlotter(QWidget *parent)
     : QWidget(parent)
     , d(new KSignalPlotterPrivate(this))
 #endif
 {
     qRegisterMetaType<KLocalizedString>("KLocalizedString");
     // Anything smaller than this does not make sense.
     setMinimumSize(KIconLoader::SizeSmall, KIconLoader::SizeSmall);
     QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     sizePolicy.setHeightForWidth(false);
     setSizePolicy(sizePolicy);
 
 #ifdef GRAPHICS_SIGNAL_PLOTTER
     setFlag(QGraphicsItem::ItemClipsToShape);
 #endif
 }
 
 KSignalPlotter::~KSignalPlotter()
 {
     delete d;
 }
 
 KLocalizedString KSignalPlotter::unit() const
 {
     return d->mUnit;
 }
 void KSignalPlotter::setUnit(const KLocalizedString &unit)
 {
     d->mUnit = unit;
 }
 
 void KSignalPlotter::addBeam(const QColor &color)
 {
     // When we add a new beam, go back and set the data for this beam to NaN for all the other times, to pad it out.
     // This is because it makes it easier for moveSensors
     for (QList<QList<qreal>>::Iterator it = d->mBeamData.begin(), total = d->mBeamData.end(); it != total; ++it) {
         (*it).append(std::numeric_limits<qreal>::quiet_NaN());
     }
     d->mBeamColors.append(color);
     d->mBeamColorsLight.append(color.lighter());
 }
 
 QColor KSignalPlotter::beamColor(int index) const
 {
     return d->mBeamColors[index];
 }
 
 void KSignalPlotter::setBeamColor(int index, const QColor &color)
 {
     if (!color.isValid()) {
         qCDebug(LIBKSYSGUARD_KSIGNALPLOTTER) << "Invalid color";
         return;
     }
     if (index >= d->mBeamColors.count()) {
         qCDebug(LIBKSYSGUARD_KSIGNALPLOTTER) << "Invalid index" << index;
         return;
     }
     Q_ASSERT(d->mBeamColors.count() == d->mBeamColorsLight.count());
 
     d->mBeamColors[index] = color;
     d->mBeamColorsLight[index] = color.lighter();
 }
 
 int KSignalPlotter::numBeams() const
 {
     return d->mBeamColors.count();
 }
 
 void KSignalPlotter::addSample(const QList<qreal> &sampleBuf)
 {
     d->addSample(sampleBuf);
 #ifdef USE_SEPERATE_WIDGET
     d->mGraphWidget->update();
 #else
     update(d->mPlottingArea);
 #endif
 }
 void KSignalPlotter::reorderBeams(const QList<int> &newOrder)
 {
     d->reorderBeams(newOrder);
 }
 
 void KSignalPlotter::changeRange(qreal min, qreal max)
 {
     if (min == d->mUserMinValue && max == d->mUserMaxValue)
         return;
     d->mUserMinValue = min;
     d->mUserMaxValue = max;
     d->calculateNiceRange();
 }
 
 void KSignalPlotter::removeBeam(int index)
 {
     if (index >= d->mBeamColors.size())
         return;
     if (index >= d->mBeamColorsLight.size())
         return;
     d->mBeamColors.removeAt(index);
     d->mBeamColorsLight.removeAt(index);
 
     QList<QList<qreal>>::Iterator i;
     for (i = d->mBeamData.begin(); i != d->mBeamData.end(); ++i) {
         if ((*i).size() >= index)
             (*i).removeAt(index);
     }
     if (d->mUseAutoRange)
         d->rescale();
 }
 
 void KSignalPlotter::setScaleDownBy(qreal value)
 {
     if (d->mScaleDownBy == value)
         return;
     d->mScaleDownBy = value;
     d->mBackgroundImage = QPixmap(); // we changed a paint setting, so reset the cache
     d->calculateNiceRange();
     update();
 }
 qreal KSignalPlotter::scaleDownBy() const
 {
     return d->mScaleDownBy;
 }
 
 void KSignalPlotter::setUseAutoRange(bool value)
 {
     d->mUseAutoRange = value;
     d->calculateNiceRange();
     // this change will be detected in paint and the image cache regenerated
 }
 
 bool KSignalPlotter::useAutoRange() const
 {
     return d->mUseAutoRange;
 }
 
 void KSignalPlotter::setMinimumValue(qreal min)
 {
     if (min == d->mUserMinValue)
         return;
     d->mUserMinValue = min;
     d->calculateNiceRange();
     update();
     // this change will be detected in paint and the image cache regenerated
 }
 
 qreal KSignalPlotter::minimumValue() const
 {
     return d->mUserMinValue;
 }
 
 void KSignalPlotter::setMaximumValue(qreal max)
 {
     if (max == d->mUserMaxValue)
         return;
     d->mUserMaxValue = max;
     d->calculateNiceRange();
     update();
     // this change will be detected in paint and the image cache regenerated
 }
 
 qreal KSignalPlotter::maximumValue() const
 {
     return d->mUserMaxValue;
 }
 
 qreal KSignalPlotter::currentMaximumRangeValue() const
 {
     return d->mNiceMaxValue;
 }
 
 qreal KSignalPlotter::currentMinimumRangeValue() const
 {
     return d->mNiceMinValue;
 }
 
 void KSignalPlotter::setHorizontalScale(uint scale)
 {
     if (scale == d->mHorizontalScale || scale == 0)
         return;
 
     d->mHorizontalScale = scale;
     d->updateDataBuffers();
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
 
     update();
 }
 
 int KSignalPlotter::horizontalScale() const
 {
     return d->mHorizontalScale;
 }
 
 void KSignalPlotter::setShowVerticalLines(bool value)
 {
     if (d->mShowVerticalLines == value)
         return;
     d->mShowVerticalLines = value;
     d->mBackgroundImage = QPixmap(); // we changed a paint setting, so reset the cache
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
     update();
 }
 
 bool KSignalPlotter::showVerticalLines() const
 {
     return d->mShowVerticalLines;
 }
 
 void KSignalPlotter::setVerticalLinesDistance(uint distance)
 {
     if (distance == d->mVerticalLinesDistance)
         return;
     d->mVerticalLinesDistance = distance;
     d->mBackgroundImage = QPixmap(); // we changed a paint setting, so reset the cache
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
     update();
 }
 
 uint KSignalPlotter::verticalLinesDistance() const
 {
     return d->mVerticalLinesDistance;
 }
 
 void KSignalPlotter::setVerticalLinesScroll(bool value)
 {
     if (value == d->mVerticalLinesScroll)
         return;
     d->mVerticalLinesScroll = value;
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
     update();
 }
 
 bool KSignalPlotter::verticalLinesScroll() const
 {
     return d->mVerticalLinesScroll;
 }
 
 void KSignalPlotter::setShowHorizontalLines(bool value)
 {
     if (value == d->mShowHorizontalLines)
         return;
     d->mShowHorizontalLines = value;
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
 
     update();
 }
 
 bool KSignalPlotter::showHorizontalLines() const
 {
     return d->mShowHorizontalLines;
 }
 
 void KSignalPlotter::setShowAxis(bool value)
 {
     if (value == d->mShowAxis)
         return;
     d->mShowAxis = value;
     d->mBackgroundImage = QPixmap(); // we changed a paint setting, so reset the cache
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
     update();
 }
 
 bool KSignalPlotter::showAxis() const
 {
     return d->mShowAxis;
 }
 
 QString KSignalPlotter::svgBackground() const
 {
     return d->mSvgFilename;
 }
 void KSignalPlotter::setSvgBackground(const QString &filename)
 {
     if (d->mSvgFilename == filename)
         return;
     d->mSvgFilename = filename;
 #ifdef SVG_SUPPORT
     if (filename.isEmpty()) {
         delete d->mSvgRenderer;
         d->mSvgRenderer = NULL;
     } else {
         if (!d->mSvgRenderer)
             d->mSvgRenderer = new Plasma::Svg(this);
         d->mSvgRenderer->setImagePath(d->mSvgFilename);
     }
 #endif
     d->mBackgroundImage = QPixmap();
     update();
 }
 
 void KSignalPlotter::setMaxAxisTextWidth(int axisTextWidth)
 {
     if (d->mAxisTextWidth == axisTextWidth)
         return;
     d->mAxisTextWidth = axisTextWidth;
     d->mBackgroundImage = QPixmap(); // we changed a paint setting, so reset the cache
     update();
 }
 
 int KSignalPlotter::maxAxisTextWidth() const
 {
     return d->mAxisTextWidth;
 }
 void KSignalPlotter::changeEvent(QEvent *event)
 {
     switch (event->type()) {
     case QEvent::ApplicationPaletteChange:
     case QEvent::PaletteChange:
     case QEvent::FontChange:
     case QEvent::LanguageChange:
     case QEvent::LocaleChange:
     case QEvent::LayoutDirectionChange:
         d->mBackgroundImage = QPixmap(); // we changed a paint setting, so reset the cache
         update();
         break;
     default: // Do nothing
         break;
     }
 }
 #ifdef GRAPHICS_SIGNAL_PLOTTER
 void KGraphicsSignalPlotter::resizeEvent(QGraphicsSceneResizeEvent *event)
 {
     QRect boundingBox(QPoint(0, 0), event->newSize().toSize());
     int fontHeight = QFontMetrics(font()).height();
 #else
 void KSignalPlotter::resizeEvent(QResizeEvent *event)
 {
     QRect boundingBox(QPoint(0, 0), event->size());
     int fontHeight = fontMetrics().height();
 #endif
     if (d->mShowAxis && d->mAxisTextWidth != 0 && boundingBox.width() > (d->mAxisTextWidth * 1.10 + 2)
         && boundingBox.height() > fontHeight) { // if there's room to draw the labels, then draw them!
         // We want to adjust the size of plotter bit inside so that the axis text aligns nicely at the top and bottom
         // but we don't want to sacrifice too much of the available room, so don't use it if it will take more than 20% of the available space
         qreal offset = (fontHeight + 1) / 2;
         if (offset < boundingBox.height() * 0.1)
             boundingBox.adjust(0, offset, 0, -offset);
 
         int padding = 1;
         if (boundingBox.width() > d->mAxisTextWidth + 50)
             padding = 10; // If there's plenty of room, at 10 pixels for padding the axis text, so that it looks nice
 
         if (layoutDirection() == Qt::RightToLeft)
             boundingBox.setRight(boundingBox.right() - d->mAxisTextWidth - padding);
         else
             boundingBox.setLeft(d->mAxisTextWidth + padding);
         d->mActualAxisTextWidth = d->mAxisTextWidth;
     } else {
         d->mActualAxisTextWidth = 0;
     }
     if (d->mShowThinFrame)
         boundingBox.adjust(0, 0, -1, -1);
 
     // Remember bounding box to pass to update, so that we only update the plotting area the next time, if that's the only that thing that has changed
     d->mPlottingArea = boundingBox;
 
     // Calculate the new number of horizontal lines
     int newHorizontalLinesCount = qBound(0, (int)(boundingBox.height() / fontHeight) - 2, 4);
     if (newHorizontalLinesCount != d->mHorizontalLinesCount) {
         d->mHorizontalLinesCount = newHorizontalLinesCount;
         d->calculateNiceRange();
     }
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
 
 #ifdef USE_SEPERATE_WIDGET
     d->mGraphWidget->setVisible(true);
     d->mGraphWidget->setGeometry(boundingBox);
 #endif
 
     d->updateDataBuffers();
 }
 
 KSignalPlotterPrivate::KSignalPlotterPrivate(KSignalPlotter *q_ptr_)
     : q(q_ptr_)
 {
     mPrecision = 0;
     mMaxSamples = NUM_SAMPLES_WHEN_INVISIBLE;
     mMinValue = mMaxValue = std::numeric_limits<qreal>::quiet_NaN();
     mUserMinValue = mUserMaxValue = 0.0;
     mNiceMinValue = mNiceMaxValue = 0.0;
     mNiceRange = 0;
     mUseAutoRange = true;
     mScaleDownBy = 1;
     mShowThinFrame = true;
     mSmoothGraph = true;
     mShowVerticalLines = false;
     mVerticalLinesDistance = 30;
     mVerticalLinesScroll = true;
     mVerticalLinesOffset = 0;
     mHorizontalScale = 6;
     mShowHorizontalLines = true;
     mHorizontalLinesCount = 4;
     mShowAxis = true;
     mAxisTextWidth = 0;
     mScrollOffset = 0;
     mStackBeams = false;
     mFillOpacity = 20;
     mRescaleTime = 0;
     mUnit = ki18n("%1");
     mAxisTextOverlapsPlotter = false;
     mActualAxisTextWidth = 0;
 #ifdef USE_SEPERATE_WIDGET
     mGraphWidget = new GraphWidget(q); ///< This is the widget that draws the actual graph
     mGraphWidget->signalPlotterPrivate = this;
     mGraphWidget->setVisible(false);
 #endif
 }
 
 void KSignalPlotterPrivate::recalculateMaxMinValueForSample(const QList<qreal> &sampleBuf, int time)
 {
     if (mStackBeams) {
         qreal value = 0;
         for (int i = sampleBuf.count() - 1; i >= 0; i--) {
             qreal newValue = sampleBuf[i];
             if (!std::isinf(newValue) && !std::isnan(newValue))
                 value += newValue;
         }
         if (std::isnan(mMinValue) || mMinValue > value)
             mMinValue = value;
         if (std::isnan(mMaxValue) || mMaxValue < value)
             mMaxValue = value;
         if (value > 0.7 * mMaxValue)
             mRescaleTime = time;
     } else {
         qreal value;
         for (int i = sampleBuf.count() - 1; i >= 0; i--) {
             value = sampleBuf[i];
             if (!std::isinf(value) && !std::isnan(value)) {
                 if (std::isnan(mMinValue) || mMinValue > value)
                     mMinValue = value;
                 if (std::isnan(mMaxValue) || mMaxValue < value)
                     mMaxValue = value;
                 if (value > 0.7 * mMaxValue)
                     mRescaleTime = time;
             }
         }
     }
 }
 
 void KSignalPlotterPrivate::rescale()
 {
     mMaxValue = mMinValue = std::numeric_limits<qreal>::quiet_NaN();
     for (int i = mBeamData.count() - 1; i >= 0; i--) {
         recalculateMaxMinValueForSample(mBeamData[i], i);
     }
     calculateNiceRange();
 }
 
 void KSignalPlotterPrivate::addSample(const QList<qreal> &sampleBuf)
 {
     if (sampleBuf.count() != mBeamColors.count()) {
         qCDebug(LIBKSYSGUARD_KSIGNALPLOTTER) << "Sample data discarded - contains wrong number of beams";
         return;
     }
     mBeamData.prepend(sampleBuf);
     if ((unsigned int)mBeamData.size() > mMaxSamples) {
         mBeamData.removeLast(); // we have too many.  Remove the last item
         if ((unsigned int)mBeamData.size() > mMaxSamples)
             mBeamData
                 .removeLast(); // If we still have too many, then we have resized the widget.  Remove one more.  That way we will slowly resize to the new size
     }
 
     if (mUseAutoRange) {
         recalculateMaxMinValueForSample(sampleBuf, 0);
 
         if (mRescaleTime++ > mMaxSamples)
             rescale();
         else if (mMinValue < mNiceMinValue || mMaxValue > mNiceMaxValue
                  || (mMaxValue > mUserMaxValue && mNiceRange != 1 && mMaxValue < (mNiceRange * 0.75 + mNiceMinValue)) || mNiceRange == 0)
             calculateNiceRange();
     } else {
         if (mMinValue < mNiceMinValue || mMaxValue > mNiceMaxValue
             || (mMaxValue > mUserMaxValue && mNiceRange != 1 && mMaxValue < (mNiceRange * 0.75 + mNiceMinValue)) || mNiceRange == 0)
             calculateNiceRange();
     }
 
     if (mScrollableImage.isNull())
         return;
     QPainter pCache(&mScrollableImage);
     drawBeamToScrollableImage(&pCache, 0);
 }
 
 void KSignalPlotterPrivate::reorderBeams(const QList<int> &newOrder)
 {
     if (newOrder.count() != mBeamColors.count()) {
         return;
     }
     QList<QList<qreal>>::Iterator it;
     for (it = mBeamData.begin(); it != mBeamData.end(); ++it) {
         if (newOrder.count() != (*it).count()) {
             qCWarning(LIBKSYSGUARD_KSIGNALPLOTTER) << "Serious problem in move sample.  beamdata[i] has " << (*it).count() << " and neworder has "
                                                    << newOrder.count();
         } else {
             QList<qreal> newBeam;
             for (int i = 0; i < newOrder.count(); i++) {
                 int newIndex = newOrder[i];
                 newBeam.append((*it).at(newIndex));
             }
             (*it) = newBeam;
         }
     }
     QList<QColor> newBeamColors;
     QList<QColor> newBeamColorsDark;
     for (int i = 0; i < newOrder.count(); i++) {
         int newIndex = newOrder[i];
         newBeamColors.append(mBeamColors.at(newIndex));
         newBeamColorsDark.append(mBeamColorsLight.at(newIndex));
     }
     mBeamColors = newBeamColors;
     mBeamColorsLight = newBeamColorsDark;
 }
 
 void KSignalPlotterPrivate::updateDataBuffers()
 {
     /*  This is called when the widget has resized
      *
      *  Determine new number of samples first.
      *  +0.5 to ensure rounding up
      *  +4 for extra data points so there is
      *     1) no wasted space and
      *     2) no loss of precision when drawing the first data point.
      */
     if (q->isVisible())
         mMaxSamples = uint(q->size().width() / mHorizontalScale + 4);
     else // If it's not visible, we can't rely on sensible values for width.  Store some minimum number of data points
         mMaxSamples = qMin((uint)(q->size().width() / mHorizontalScale + 4), NUM_SAMPLES_WHEN_INVISIBLE);
 }
 
 #ifdef GRAPHICS_SIGNAL_PLOTTER
 void KGraphicsSignalPlotter::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     Q_UNUSED(widget);
 #else
 void KSignalPlotter::paintEvent(QPaintEvent *event)
 {
     if (testAttribute(Qt::WA_PendingResizeEvent))
         return; // lets not do this more than necessary, shall we?
     QPainter p(this);
     QPainter *painter = &p;
 #endif
 
     uint w = size().width();
     uint h = size().height();
     /* Do not do repaints when the widget is not yet setup properly. */
     if (w <= 2 || h <= 2)
         return;
 
 #ifdef GRAPHICS_SIGNAL_PLOTTER
     bool onlyDrawPlotter = option && d->mPlottingArea.contains(option->exposedRect.toRect());
 #else
     bool onlyDrawPlotter = event && d->mPlottingArea.contains(event->rect());
 #endif
 
 #ifdef USE_SEPERATE_WIDGET
     if (onlyDrawPlotter)
         return; // The painting will be handled entirely by GraphWidget::paintEvent
 #endif
 
     if (!onlyDrawPlotter && d->mShowThinFrame)
         d->drawThinFrame(painter, d->mPlottingArea.adjusted(0, 0, 1, 1)); // We have a 'frame' in the bottom and right - so subtract them from the view
 
 #ifndef USE_SEPERATE_WIDGET
     d->drawWidget(painter, d->mPlottingArea); // Draw the widget only if we don't have a GraphWidget to draw it for us
 #endif
 
     if (d->mShowAxis) {
 #ifdef GRAPHICS_SIGNAL_PLOTTER
         int fontheight = QFontMetrics(font()).height();
 #else
         int fontheight = fontMetrics().height();
 #endif
         if (d->mPlottingArea.height() > fontheight) { // if there's room to draw the labels, then draw them!
             d->drawAxisText(painter, QRect(0, 0, w, h));
         }
     }
 }
 #ifdef USE_SEPERATE_WIDGET
 void GraphWidget::paintEvent(QPaintEvent *)
 {
     if (testAttribute(Qt::WA_PendingResizeEvent))
         return; // lets not do this more than necessary, shall we?
 
     uint w = width();
     uint h = height();
     /* Do not do repaints when the widget is not yet setup properly. */
     if (w <= 2 || h <= 2)
         return;
     QPainter p(this);
 
     signalPlotterPrivate->drawWidget(&p, QRect(0, 0, w, h));
 
     if (signalPlotterPrivate->mAxisTextOverlapsPlotter && signalPlotterPrivate->mShowAxis) {
         uint fontheight = signalPlotterPrivate->q->fontMetrics().height();
         if (h > fontheight) { // if there's room to draw the labels, then draw them!
             QSize originalSize = signalPlotterPrivate->q->size();
             signalPlotterPrivate->drawAxisText(&p, QRect(-signalPlotterPrivate->mPlottingArea.topLeft(), originalSize));
         }
     }
 }
 #endif
 void KSignalPlotterPrivate::drawWidget(QPainter *p, const QRect &boundingBox)
 {
 #ifdef SVG_SUPPORT
     if (!mSvgFilename.isEmpty()) {
         if (mBackgroundImage.isNull() || mBackgroundImage.height() != boundingBox.height()
             || mBackgroundImage.width() != boundingBox.width()) { // recreate on resize etc
             updateSvgBackground(boundingBox);
         }
         p->drawPixmap(boundingBox, mBackgroundImage);
     }
 #endif
 
     if (mScrollableImage.isNull())
         redrawScrollableImage();
 
     // We draw the pixmap in two halves, wrapping around the window
     if (mScrollOffset > 1) {
 #ifdef USE_QIMAGE
         p->drawImage(boundingBox.right() - mScrollOffset + 2, boundingBox.top(), mScrollableImage, 0, 0, mScrollOffset - 1, boundingBox.height());
 #else
         p->drawPixmap(boundingBox.right() - mScrollOffset + 2, boundingBox.top(), mScrollableImage, 0, 0, mScrollOffset - 1, boundingBox.height());
 #endif
     }
     int widthOfSecondHalf = boundingBox.width() - mScrollOffset + 1;
     if (widthOfSecondHalf > 0) {
 #ifdef USE_QIMAGE
         p->drawImage(boundingBox.left(),
                      boundingBox.top(),
                      mScrollableImage,
                      mScrollableImage.width() - widthOfSecondHalf - 1,
                      0,
                      widthOfSecondHalf,
                      boundingBox.height());
 #else
         p->drawPixmap(boundingBox.left(),
                       boundingBox.top(),
                       mScrollableImage,
                       mScrollableImage.width() - widthOfSecondHalf - 1,
                       0,
                       widthOfSecondHalf,
                       boundingBox.height());
 #endif
     }
 
     /* Draw scope-like grid vertical lines if it doesn't move.  If it does move, draw it in the dynamic part of the code*/
     if (mShowVerticalLines && !mVerticalLinesScroll)
         drawVerticalLines(p, boundingBox);
 }
 void KSignalPlotterPrivate::drawBackground(QPainter *p, const QRect &boundingBox) const
 {
     p->setRenderHint(QPainter::Antialiasing, false);
 #ifdef SVG_SUPPORT
     if (!mSvgFilename.isEmpty()) // our background is an svg, so don't paint over the top of it
         p->fillRect(boundingBox, Qt::transparent);
     else
 #endif
         p->fillRect(boundingBox, q->palette().brush(QPalette::Base));
 
     if (mShowHorizontalLines)
         drawHorizontalLines(p, boundingBox.adjusted(0, 0, 1, 0));
 
     if (mShowVerticalLines && mVerticalLinesScroll)
         drawVerticalLines(p, boundingBox, mVerticalLinesOffset);
 
     p->setRenderHint(QPainter::Antialiasing, true);
 }
 
 bool KSignalPlotter::thinFrame() const
 {
     return d->mShowThinFrame;
 }
 void KSignalPlotter::setThinFrame(bool thinFrame)
 {
     if (thinFrame == d->mShowThinFrame)
         return;
 
     d->mShowThinFrame = thinFrame;
     update(); // Trigger a repaint
 }
 
 #ifdef SVG_SUPPORT
 void KSignalPlotterPrivate::updateSvgBackground(const QRect &boundingBox)
 {
     Q_ASSERT(!mSvgFilename.isEmpty());
     Q_ASSERT(boundingBox.isNull());
     mBackgroundImage = QPixmap(boundingBox.width(), boundingBox.height());
     Q_ASSERT(!mBackgroundImage.isNull());
     QPainter pCache(&mBackgroundImage);
     pCache.fill(q->palette().color(QPalette::Base));
 
     svgRenderer->resize(boundingBox.size());
     svgRenderer->paint(&pCache, 0, 0);
 }
 #endif
 void KSignalPlotterPrivate::redrawScrollableImage()
 {
     // Align width of bounding box to the size of the horizontal scale
     int alignedWidth = ((mPlottingArea.width() + 1) / mHorizontalScale + 1) * mHorizontalScale;
     // Redraw the whole thing
 #ifdef USE_QIMAGE
     mScrollableImage = QImage(alignedWidth, mPlottingArea.height(), QImage::Format_ARGB32_Premultiplied);
 #else
     mScrollableImage = QPixmap(alignedWidth, mPlottingArea.height());
 #endif
     Q_ASSERT(!mScrollableImage.isNull());
 
     mScrollOffset = 0;
     mVerticalLinesOffset = mVerticalLinesDistance - mHorizontalScale + 1; // mVerticalLinesDistance - alignedWidth % mVerticalLinesDistance;
     // We need to draw the background for areas without a beam
     int withoutBeamWidth = qMax(mBeamData.size() - 1, 0) * mHorizontalScale;
     QPainter pCache(&mScrollableImage);
     if (withoutBeamWidth < mScrollableImage.width())
         drawBackground(&pCache, QRect(withoutBeamWidth, 0, alignedWidth - withoutBeamWidth, mScrollableImage.height()));
 
     /* Draw scope-like grid vertical lines */
     mVerticalLinesOffset = 0;
     if (mBeamData.size() > 2) {
         for (int i = mBeamData.size() - 2; i >= 0; i--)
             drawBeamToScrollableImage(&pCache, i);
     }
 }
 
 void KSignalPlotterPrivate::drawThinFrame(QPainter *p, const QRect &boundingBox)
 {
     /* Draw a line along the bottom and the right side of the
      * widget to create a 3D like look. */
     p->setRenderHint(QPainter::Antialiasing, false);
     p->setPen(QPen(q->palette().color(QPalette::Light), 0));
     p->drawLine(boundingBox.bottomLeft(), boundingBox.bottomRight());
     p->drawLine(boundingBox.bottomRight(), boundingBox.topRight());
     p->setRenderHint(QPainter::Antialiasing, true);
 }
 
 void KSignalPlotterPrivate::calculateNiceRange()
 {
     qreal max = mUserMaxValue;
     qreal min = mUserMinValue;
     if (mUseAutoRange) {
         if (!std::isnan(mMaxValue) && mMaxValue * 0.99 > max) // Allow max value to go very slightly over the given max, for rounding reasons
             max = mMaxValue;
         if (!std::isnan(mMinValue) && mMinValue * 0.99 < min) {
             min = mMinValue;
         }
     }
 
     /* If the range is too small we will force it to 1.0 since it
      * looks a lot nicer. */
     if (max - min < 0.000001)
         max = min + 1;
 
     qreal range = max - min;
 
     // Massage the range so that the grid shows some nice values.
     qreal step;
     int number_lines_above_zero = 0;
     int number_lines_below_zero = 0;
     // If y=0 is visible and have at least 1 horizontal lines make sure that we have a line crossing through 0
     bool alignToXAxis = min < 0 && max > 0 && mHorizontalLinesCount >= 1;
     if (alignToXAxis) {
         number_lines_above_zero = int(mHorizontalLinesCount * max / range);
         number_lines_below_zero = mHorizontalLinesCount - number_lines_above_zero - 1; // subtract 1 line for the actual 0 line
         step = qMax(max / (mScaleDownBy * (number_lines_above_zero + 1)), -min / (mScaleDownBy * (number_lines_below_zero + 1)));
     } else
         step = range / (mScaleDownBy * (mHorizontalLinesCount + 1));
 
     const int sigFigs = 2; // Number of significant figures of the step to use.  Update the 0.05 below if this changes
     int logdim = (int)floor(log10(step)) - (sigFigs - 1); // find the order of the number, reduced by 1.  E.g. if step=1234 then logdim is 3-1=2
     qreal dim = pow((qreal)10.0, logdim); // e.g.  if step=1234, logdim=2, so dim = 100
     int a = (int)ceil(step / dim - 0.000005); // so a = ceil(1234/100) = ceil(12.34) = 13    (we subtract an epsilon)
 
     if (logdim >= 0)
         mPrecision = 0; // Work out the number of decimal places.  e.g. If step=1.5, then logdim = -1 so precision is 1
     else if (a % 10 == 0) // We just happened to round to a nice number, requiring 1 less precision
         mPrecision = -logdim - 1;
     else
         mPrecision = -logdim;
     step = dim * a; // e.g. if step=1234, dim=100, a=13  so step= 1300.  So 1234 was rounded up to 1300
 
     range = mScaleDownBy * step * (mHorizontalLinesCount + 1);
 
     if (alignToXAxis) {
         max = mScaleDownBy * step * (number_lines_above_zero + 1);
         min = -mScaleDownBy * step * (number_lines_below_zero + 1);
     } else
         max = min + range;
 
     if (mNiceMinValue == min && mNiceRange == range)
         return; // nothing changed
 
     mNiceMaxValue = max;
     mNiceMinValue = min;
     mNiceRange = range;
 
 #ifdef USE_QIMAGE
     mScrollableImage = QImage();
 #else
     mScrollableImage = QPixmap();
 #endif
     Q_EMIT q->axisScaleChanged();
     q->update();
 }
 
 void KSignalPlotterPrivate::drawVerticalLines(QPainter *p, const QRect &boundingBox, int offset) const
 {
     QColor color = q->palette().color(QPalette::Window);
     if (!mVerticalLinesScroll)
         color.setAlpha(127);
     p->setPen(QPen(color, 0));
 
     p->setRenderHint(QPainter::Antialiasing, false);
     for (int x = boundingBox.right() - (offset % mVerticalLinesDistance); x >= boundingBox.left(); x -= mVerticalLinesDistance)
         p->drawLine(x, boundingBox.top(), x, boundingBox.bottom());
     p->setRenderHint(QPainter::Antialiasing, true);
 }
 
 void KSignalPlotterPrivate::drawBeamToScrollableImage(QPainter *p, int index)
 {
     QRect cacheBoundingBox = QRect(mScrollOffset, 0, mHorizontalScale, mScrollableImage.height());
 
     drawBackground(p, cacheBoundingBox);
     drawBeam(p, cacheBoundingBox, mHorizontalScale, index);
 
     mScrollOffset += mHorizontalScale;
     mVerticalLinesOffset = (mVerticalLinesOffset + mHorizontalScale) % mVerticalLinesDistance;
     if (mScrollOffset >= mScrollableImage.width() - 1) {
         mScrollOffset = 0;
         mVerticalLinesOffset--; // We skip over the last pixel drawn
     }
 }
 
 void KSignalPlotterPrivate::drawBeam(QPainter *p, const QRect &boundingBox, int horizontalScale, int index)
 {
     if (mNiceRange == 0)
         return;
     QPen pen;
     if (mHorizontalScale == 1) // Don't use a pen width of 2 if there's only 1 pixel between points
         pen.setWidth(1);
     else
         pen.setWidth(2);
 
     pen.setCapStyle(Qt::FlatCap);
 
     qreal scaleFac = (boundingBox.height() - 2) / mNiceRange;
     if (mBeamData.size() - 1 <= index)
         return; // Something went wrong?
 
     const QList<qreal> &datapoints = mBeamData[index];
     const QList<qreal> &prev_datapoints = mBeamData[index + 1];
     bool hasPrevPrevDatapoints = (index + 2 < mBeamData.size()); // used for bezier curve gradient calculation
     const QList<qreal> &prev_prev_datapoints = hasPrevPrevDatapoints ? mBeamData[index + 2] : prev_datapoints;
 
     qreal x0 = boundingBox.right();
     qreal x1 = qMax(boundingBox.right() - horizontalScale, 0);
 
     qreal xaxis = boundingBox.bottom();
     if (mNiceMinValue < 0)
         xaxis = qMax(qreal(xaxis + mNiceMinValue * scaleFac), qreal(boundingBox.top()));
 
     const int count = qMin(datapoints.size(), mBeamColors.size());
     QVector<QPainterPath> paths(count);
     QPointF previous_c0;
     QPointF previous_c1;
     QPointF previous_c2;
     QPointF previous_c3;
     qreal previous_point0 = 0;
     qreal previous_point1 = 0;
     qreal previous_point2 = 0;
     bool firstLine = true;
     for (int j = 0; j < count; ++j) {
         qreal point0 = datapoints[j];
         if (std::isnan(point0))
             continue; // Just do not draw points with nans. skip them
 
         qreal point1 = prev_datapoints[j];
         qreal point2 = prev_prev_datapoints[j];
 
         if (std::isnan(point1))
             point1 = point0;
         else if (mSmoothGraph && !std::isinf(point1)) {
             // Apply a weighted average just to smooth the graph out a bit
             // Do not try to smooth infinities or nans
             point0 = (2 * point0 + point1) / 3;
             if (!std::isnan(point2) && !std::isinf(point2))
                 point1 = (2 * point1 + point2) / 3;
             // We don't bother to average out y2.  This will introduce slight inaccuracies in the gradients, but they aren't really noticeable.
         }
         if (std::isnan(point2))
             point2 = point1;
 
         if (mStackBeams) {
             point0 = previous_point0 = previous_point0 + point0;
             point1 = previous_point1 = previous_point1 + point1;
             point2 = previous_point2 = previous_point2 + point2;
         }
 
         qreal y0 = qBound((qreal)boundingBox.top(), boundingBox.bottom() - (point0 - mNiceMinValue) * scaleFac, (qreal)boundingBox.bottom());
         qreal y1 = qBound((qreal)boundingBox.top(), boundingBox.bottom() - (point1 - mNiceMinValue) * scaleFac, (qreal)boundingBox.bottom());
         qreal y2 = qBound((qreal)boundingBox.top(), boundingBox.bottom() - (point2 - mNiceMinValue) * scaleFac, (qreal)boundingBox.bottom());
 
         QPainterPath &path = paths[j];
         path.moveTo(x1, y1);
         QPointF c1(x1 + horizontalScale / 3.0, (4 * y1 - y2) / 3.0); // Control point 1 - same gradient as prev_prev_datapoint to prev_datapoint
         QPointF c2(x1 + 2 * horizontalScale / 3.0, (2 * y0 + y1) / 3.0); // Control point 2 - same gradient as prev_datapoint to datapoint
         QPointF c3(x0, y0);
         path.cubicTo(c1, c2, c3);
         if (mFillOpacity) {
             QPainterPath fillPath = path; // Make a copy to do our fill
             if (!mStackBeams || firstLine) {
                 fillPath.lineTo(x0, xaxis);
                 fillPath.lineTo(x1, xaxis);
                 fillPath.lineTo(x1, y1);
             } else {
                 fillPath.lineTo(x0, previous_c3.y());
                 fillPath.cubicTo(previous_c2, previous_c1, previous_c0);
                 fillPath.lineTo(x1, y1);
             }
             if (mStackBeams) {
                 previous_c0 = QPointF(x1, y1);
                 previous_c1 = c1;
                 previous_c2 = c2;
                 previous_c3 = c3;
             }
             QColor fillColor = mBeamColors[j];
             fillColor.setAlpha(mFillOpacity);
             p->fillPath(fillPath, fillColor);
         }
         firstLine = false;
     }
     for (int j = count - 1; j >= 0; --j) {
         if (mFillOpacity)
             pen.setColor(mBeamColorsLight.at(j));
         else
             pen.setColor(mBeamColors.at(j));
         p->strokePath(paths.at(j), pen);
     }
 }
 void KSignalPlotterPrivate::drawAxisText(QPainter *p, const QRect &boundingBox)
 {
     if (mHorizontalLinesCount < 0)
         return;
     p->setFont(q->font());
     qreal stepsize = mNiceRange / (mScaleDownBy * (mHorizontalLinesCount + 1));
     if (mActualAxisTextWidth == 0) // If we are drawing completely inside the plotter area, using the Text color
         p->setPen(QPen(q->palette().brush(QPalette::Text), 0));
     else
         p->setPen(QPen(q->palette().brush(QPalette::WindowText), 0));
     int axisTitleIndex = 1;
     QString val;
     int numItems = mHorizontalLinesCount + 2;
     int fontHeight = p->fontMetrics().height();
     if (numItems == 2 && boundingBox.height() < fontHeight * 2)
         numItems = 1;
     mAxisTextOverlapsPlotter = false;
     for (int y = 0; y < numItems; y++, axisTitleIndex++) {
         int y_coord =
             boundingBox.top() + (y * (boundingBox.height() - fontHeight)) / (mHorizontalLinesCount + 1); // Make sure it's y*h first to avoid rounding bugs
         qreal value;
         if (y == mHorizontalLinesCount + 1)
             value = mNiceMinValue / mScaleDownBy; // sometimes using the formulas gives us a value very slightly off
         else
             value = mNiceMaxValue / mScaleDownBy - y * stepsize;
 
         val = scaledValueAsString(value, mPrecision);
         QRect textBoundingRect = p->fontMetrics().boundingRect(val);
 
         if (textBoundingRect.width() > mActualAxisTextWidth)
             mAxisTextOverlapsPlotter = true;
         int offset = qMax(mActualAxisTextWidth - textBoundingRect.right(), -textBoundingRect.left());
         if (q->layoutDirection() == Qt::RightToLeft)
             p->drawText(boundingBox.left(), y_coord, boundingBox.width() - offset, fontHeight + 1, Qt::AlignLeft | Qt::AlignTop, val);
         else
             p->drawText(boundingBox.left() + offset, y_coord, boundingBox.width() - offset, fontHeight + 1, Qt::AlignLeft | Qt::AlignTop, val);
     }
 }
 
 void KSignalPlotterPrivate::drawHorizontalLines(QPainter *p, const QRect &boundingBox) const
 {
     if (mHorizontalLinesCount <= 0)
         return;
     p->setPen(QPen(q->palette().color(QPalette::Window)));
     for (int y = 0; y <= mHorizontalLinesCount + 1; y++) {
         // note that the y_coord starts from 0.  so we draw from pixel number 0 to h-1.  Thus the -1 in the y_coord
         int y_coord = boundingBox.top() + (y * (boundingBox.height() - 1)) / (mHorizontalLinesCount + 1); // Make sure it's y*h first to avoid rounding bugs
         p->drawLine(boundingBox.left(), y_coord, boundingBox.right() - 1, y_coord);
     }
 }
 
 int KSignalPlotter::currentAxisPrecision() const
 {
     return d->mPrecision;
 }
 
 qreal KSignalPlotter::lastValue(int i) const
 {
     if (d->mBeamData.isEmpty() || d->mBeamData.first().size() <= i)
         return std::numeric_limits<qreal>::quiet_NaN();
     return d->mBeamData.first().at(i);
 }
 QString KSignalPlotter::lastValueAsString(int i, int precision) const
 {
     if (d->mBeamData.isEmpty() || d->mBeamData.first().size() <= i || std::isnan(d->mBeamData.first().at(i)))
         return QString();
     return valueAsString(d->mBeamData.first().at(i), precision); // retrieve the newest value for this beam
 }
 QString KSignalPlotter::valueAsString(qreal value, int precision) const
 {
     if (std::isnan(value))
         return QString();
     value = value / d->mScaleDownBy; // scale the value.  E.g. from Bytes to KiB
     return d->scaledValueAsString(value, precision);
 }
 QString KSignalPlotterPrivate::scaledValueAsString(qreal value, int precision) const
 {
     qreal absvalue = qAbs(value);
     if (precision == -1) {
         if (absvalue >= 99.5)
             precision = 0;
         else if (absvalue >= 0.995 || (mScaleDownBy == 1 && mNiceMaxValue > 20))
             precision = 1;
         else
             precision = 2;
     }
 
     if (absvalue < 1E6) {
         if (precision == 0)
             return mUnit.subs((long)value).toString();
         else
             return mUnit.subs(value, 0, 'f', precision).toString();
     } else
         return mUnit.subs(value, 0, 'g', precision).toString();
 }
 
 bool KSignalPlotter::smoothGraph() const
 {
     return d->mSmoothGraph;
 }
 
 void KSignalPlotter::setSmoothGraph(bool smooth)
 {
     d->mSmoothGraph = smooth;
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
 }
 
 bool KSignalPlotter::stackGraph() const
 {
     return d->mStackBeams;
 }
 void KSignalPlotter::setStackGraph(bool stack)
 {
     d->mStackBeams = stack;
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
 }
 
 int KSignalPlotter::fillOpacity() const
 {
     return d->mFillOpacity;
 }
 void KSignalPlotter::setFillOpacity(int fill)
 {
     d->mFillOpacity = fill;
 #ifdef USE_QIMAGE
     d->mScrollableImage = QImage();
 #else
     d->mScrollableImage = QPixmap();
 #endif
 }
 
 #ifdef GRAPHICS_SIGNAL_PLOTTER
 QPainterPath KGraphicsSignalPlotter::opaqueArea() const
 {
     return shape(); // The whole thing is opaque
 }
 
 QSizeF KGraphicsSignalPlotter::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
 {
     Q_UNUSED(constraint);
     if (which == Qt::PreferredSize)
         return QSizeF(200, 200);
     return QGraphicsWidget::sizeHint(which, constraint);
 }
 #else
 QSize KSignalPlotter::sizeHint() const
 {
     return QSize(200, 200); // Just a random size which would usually look okay
 }
 #endif
 
 #ifdef USE_SEPERATE_WIDGET
 GraphWidget::GraphWidget(QWidget *parent)
     : QWidget(parent)
 {
 }
 #endif
 
 #undef KSignalPlotter
 #undef KSignalPlotterPrivate