HG_REPOSITORIES/LPP/INSTRUMENTATION/USERS/JEANDET/qtcharts Commit - r2759:8e20d47d8440

Fix QLogValueAxis update...

Titta Heikkala -

r2759:8e20d47d8440

parent child

Context file:

r2759:8e20d47d8440

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src/charts/axis/horizontalaxis.cpp +7 -3

             /****************************************************************************
             **
             ** Copyright (C) 2014 Digia Plc
             ** All rights reserved.
             ** For any questions to Digia, please use contact form at http://qt.io
             **
             ** This file is part of the Qt Charts module.
             **
             ** Licensees holding valid commercial license for Qt may use this file in
             ** accordance with the Qt License Agreement provided with the Software
             ** or, alternatively, in accordance with the terms contained in a written
             ** agreement between you and Digia.
             **
             ** If you have questions regarding the use of this file, please use
             ** contact form at http://qt.io
             **
             ****************************************************************************/
             #include <private/horizontalaxis_p.h>
             #include <private/qabstractaxis_p.h>
             #include <private/chartpresenter_p.h>
             #include <QtCore/QtMath>
             #include <QtCore/QDebug>
             QT_CHARTS_BEGIN_NAMESPACE
             HorizontalAxis::HorizontalAxis(QAbstractAxis *axis, QGraphicsItem *item, bool intervalAxis)
                 : CartesianChartAxis(axis, item, intervalAxis)
             {
             }
             HorizontalAxis::~HorizontalAxis()
             {
             }
             void HorizontalAxis::updateGeometry()
             {
                 const QVector<qreal> &layout = ChartAxisElement::layout();
-                if (layout.isEmpty())
+                if (layout.isEmpty() && axis()->type() != QAbstractAxis::AxisTypeLogValue)
                     return;
                 QStringList labelList = labels();
-                QList<QGraphicsItem *> lines = gridItems();
                 QList<QGraphicsItem *> labels = labelItems();
-                QList<QGraphicsItem *> shades = shadeItems();
                 QList<QGraphicsItem *> arrow = arrowItems();
                 QGraphicsTextItem *title = titleItem();
                 Q_ASSERT(labels.size() == labelList.size());
                 Q_ASSERT(layout.size() == labelList.size());
                 const QRectF &axisRect = axisGeometry();
                 const QRectF &gridRect = gridGeometry();
                 //arrow
                 QGraphicsLineItem *arrowItem = static_cast<QGraphicsLineItem *>(arrow.at(0));
                 if (axis()->alignment() == Qt::AlignTop)
                     arrowItem->setLine(gridRect.left(), axisRect.bottom(), gridRect.right(), axisRect.bottom());
                 else if (axis()->alignment() == Qt::AlignBottom)
                     arrowItem->setLine(gridRect.left(), axisRect.top(), gridRect.right(), axisRect.top());
                 qreal width = 0;
                 const QLatin1String ellipsis("...");
                 //title
                 QRectF titleBoundingRect;
                 QString titleText = axis()->titleText();
                 qreal availableSpace = axisRect.height() - labelPadding();
                 if (!titleText.isEmpty() && titleItem()->isVisible()) {
                     availableSpace -= titlePadding() * 2.0;
                     qreal minimumLabelHeight = ChartPresenter::textBoundingRect(axis()->labelsFont(),
                                                                                 QStringLiteral("...")).height();
                     qreal titleSpace = availableSpace - minimumLabelHeight;
                     title->setHtml(ChartPresenter::truncatedText(axis()->titleFont(), titleText, qreal(0.0),
                                                                  gridRect.width(), titleSpace,
                                                                  titleBoundingRect));
                     title->setTextWidth(titleBoundingRect.width());
                     titleBoundingRect = title->boundingRect();
                     QPointF center = gridRect.center() - titleBoundingRect.center();
                     if (axis()->alignment() == Qt::AlignTop)
                         title->setPos(center.x(), axisRect.top() + titlePadding());
                     else  if (axis()->alignment() == Qt::AlignBottom)
                         title->setPos(center.x(), axisRect.bottom() - titleBoundingRect.height() - titlePadding());
                     availableSpace -= titleBoundingRect.height();
                 }
+                if (layout.isEmpty() && axis()->type() == QAbstractAxis::AxisTypeLogValue)
+                    return;
+                QList<QGraphicsItem *> lines = gridItems();
+                QList<QGraphicsItem *> shades = shadeItems();
                 for (int i = 0; i < layout.size(); ++i) {
                     //items
                     QGraphicsLineItem *gridItem = static_cast<QGraphicsLineItem*>(lines.at(i));
                     QGraphicsLineItem *tickItem = static_cast<QGraphicsLineItem*>(arrow.at(i + 1));
                     QGraphicsTextItem *labelItem = static_cast<QGraphicsTextItem *>(labels.at(i));
                     //grid line
                     gridItem->setLine(layout[i], gridRect.top(), layout[i], gridRect.bottom());
                     //label text wrapping
                     QString text = labelList.at(i);
                     QRectF boundingRect;
                     // don't truncate empty labels
                     if (text.isEmpty()) {
                         labelItem->setHtml(text);
                     } else  {
                         qreal labelWidth = axisRect.width() / layout.count() - (2 * labelPadding());
                         QString truncatedText = ChartPresenter::truncatedText(axis()->labelsFont(), text,
                                                                               axis()->labelsAngle(),
                                                                               labelWidth,
                                                                               availableSpace, boundingRect);
                         labelItem->setTextWidth(ChartPresenter::textBoundingRect(axis()->labelsFont(),
                                                                                  truncatedText).width());
                         labelItem->setHtml(truncatedText);
                     }
                     //label transformation origin point
                     const QRectF& rect = labelItem->boundingRect();
                     QPointF center = rect.center();
                     labelItem->setTransformOriginPoint(center.x(), center.y());
                     qreal heightDiff = rect.height() - boundingRect.height();
                     qreal widthDiff = rect.width() - boundingRect.width();
                     //ticks and label position
                     if (axis()->alignment() == Qt::AlignTop) {
                         labelItem->setPos(layout[i] - center.x(), axisRect.bottom() - rect.height() + (heightDiff / 2.0) - labelPadding());
                         tickItem->setLine(layout[i], axisRect.bottom(), layout[i], axisRect.bottom() - labelPadding());
                     } else if (axis()->alignment() == Qt::AlignBottom) {
                         labelItem->setPos(layout[i] - center.x(), axisRect.top() - (heightDiff / 2.0) + labelPadding());
                         tickItem->setLine(layout[i], axisRect.top(), layout[i], axisRect.top() + labelPadding());
                     }
                     //label in between
                     bool forceHide = false;
                     if (intervalAxis() && (i + 1) != layout.size()) {
                         qreal leftBound = qMax(layout[i], gridRect.left());
                         qreal rightBound = qMin(layout[i + 1], gridRect.right());
                         const qreal delta = rightBound - leftBound;
                         // Hide label in case visible part of the category at the grid edge is too narrow
                         if (delta < boundingRect.width()
                             && (leftBound == gridRect.left() || rightBound == gridRect.right())
                             && !intervalAxis()) {
                             forceHide = true;
                         } else {
                             labelItem->setPos(leftBound + (delta / 2.0) - center.x(), labelItem->pos().y());
                         }
                     }
                     //label overlap detection - compensate one pixel for rounding errors
                     if ((labelItem->pos().x() < width && labelItem->toPlainText() == ellipsis) || forceHide ||
                         (labelItem->pos().x() + (widthDiff / 2.0)) < (axisRect.left() - 1.0) ||
                         (labelItem->pos().x() + (widthDiff / 2.0) - 1.0) > axisRect.right()) {
                         labelItem->setVisible(false);
                     } else {
                         labelItem->setVisible(true);
                         width = boundingRect.width() + labelItem->pos().x();
                     }
                     //shades
                     QGraphicsRectItem *shadeItem = 0;
                     if (i == 0)
                         shadeItem = static_cast<QGraphicsRectItem *>(shades.at(0));
                     else if (i % 2)
                         shadeItem = static_cast<QGraphicsRectItem *>(shades.at((i / 2) + 1));
                     if (shadeItem) {
                         qreal leftBound;
                         qreal rightBound;
                         if (i == 0) {
                             leftBound = gridRect.left();
                             rightBound = layout[0];
                         } else {
                             leftBound = layout[i];
                             if (i == layout.size() - 1)
                                 rightBound = gridRect.right();
                             else
                                 rightBound = qMin(layout[i + 1], gridRect.right());
                         }
                         shadeItem->setRect(leftBound, gridRect.top(), rightBound - leftBound,
                                            gridRect.height());
                         if (shadeItem->rect().width() <= 0.0)
                             shadeItem->setVisible(false);
                         else
                             shadeItem->setVisible(true);
                     }
                     // check if the grid line and the axis tick should be shown
                     qreal x = gridItem->line().p1().x();
                     if (x < gridRect.left() || x > gridRect.right()) {
                         gridItem->setVisible(false);
                         tickItem->setVisible(false);
                     } else {
                         gridItem->setVisible(true);
                         tickItem->setVisible(true);
                     }
                 }
                 //begin/end grid line in case labels between
                 if (intervalAxis()) {
                     QGraphicsLineItem *gridLine;
                     gridLine = static_cast<QGraphicsLineItem *>(lines.at(layout.size()));
                     gridLine->setLine(gridRect.right(), gridRect.top(), gridRect.right(), gridRect.bottom());
                     gridLine->setVisible(true);
                     gridLine = static_cast<QGraphicsLineItem*>(lines.at(layout.size()+1));
                     gridLine->setLine(gridRect.left(), gridRect.top(), gridRect.left(), gridRect.bottom());
                     gridLine->setVisible(true);
                 }
             }
             QSizeF HorizontalAxis::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
             {
                 Q_UNUSED(constraint);
                 QSizeF sh(0,0);
                 if (axis()->titleText().isEmpty() || !titleItem()->isVisible())
                     return sh;
                 switch (which) {
                 case Qt::MinimumSize: {
                     QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(),
                                                                         QStringLiteral("..."));
                     sh = QSizeF(titleRect.width(), titleRect.height() + (titlePadding() * 2.0));
                     break;
                 }
                 case Qt::MaximumSize:
                 case Qt::PreferredSize: {
                     QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(), axis()->titleText());
                     sh = QSizeF(titleRect.width(), titleRect.height() + (titlePadding() * 2.0));
                     break;
                 }
                 default:
                     break;
                 }
                 return sh;
             }
             QT_CHARTS_END_NAMESPACE

src/charts/axis/logvalueaxis/chartlogvalueaxisx.cpp +2 -4

             /****************************************************************************
             **
             ** Copyright (C) 2014 Digia Plc
             ** All rights reserved.
             ** For any questions to Digia, please use contact form at http://qt.io
             **
             ** This file is part of the Qt Charts module.
             **
             ** Licensees holding valid commercial license for Qt may use this file in
             ** accordance with the Qt License Agreement provided with the Software
             ** or, alternatively, in accordance with the terms contained in a written
             ** agreement between you and Digia.
             **
             ** If you have questions regarding the use of this file, please use
             ** contact form at http://qt.io
             **
             ****************************************************************************/
             #include <private/chartlogvalueaxisx_p.h>
             #include <private/chartpresenter_p.h>
             #include <QtCharts/QLogValueAxis>
             #include <private/abstractchartlayout_p.h>
             #include <QtWidgets/QGraphicsLayout>
             #include <QtCore/QtMath>
             #include <QtCore/QDebug>
             QT_CHARTS_BEGIN_NAMESPACE
             ChartLogValueAxisX::ChartLogValueAxisX(QLogValueAxis *axis, QGraphicsItem *item)
                 : HorizontalAxis(axis, item),
                   m_axis(axis)
             {
                 QObject::connect(m_axis, SIGNAL(baseChanged(qreal)), this, SLOT(handleBaseChanged(qreal)));
                 QObject::connect(m_axis, SIGNAL(labelFormatChanged(QString)), this, SLOT(handleLabelFormatChanged(QString)));
             }
             ChartLogValueAxisX::~ChartLogValueAxisX()
             {
             }
             QVector<qreal> ChartLogValueAxisX::calculateLayout() const
             {
                 QVector<qreal> points;
                 qreal logMax = log10(m_axis->max()) / log10(m_axis->base());
                 qreal logMin = log10(m_axis->min()) / log10(m_axis->base());
                 qreal leftEdge = logMin < logMax ? logMin : logMax;
                 qreal ceilEdge = ceil(leftEdge);
                 int tickCount = qAbs(ceil(logMax) - ceil(logMin));
-                points.resize(tickCount + 1);
+                points.resize(tickCount);
                 const QRectF &gridRect = gridGeometry();
                 const qreal deltaX = gridRect.width() / qAbs(logMax - logMin);
-                for (int i = 0; i <= tickCount; ++i)
+                for (int i = 0; i < tickCount; ++i)
                     points[i] = (ceilEdge + qreal(i)) * deltaX - leftEdge * deltaX + gridRect.left();
                 return points;
             }
             void ChartLogValueAxisX::updateGeometry()
             {
                 const QVector<qreal>& layout = ChartAxisElement::layout();
-                if (layout.isEmpty())
-                    return;
                 setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat()));
                 HorizontalAxis::updateGeometry();
             }
             void ChartLogValueAxisX::handleBaseChanged(qreal base)
             {
                 Q_UNUSED(base);
                 QGraphicsLayoutItem::updateGeometry();
                 if(presenter()) presenter()->layout()->invalidate();
             }
             void ChartLogValueAxisX::handleLabelFormatChanged(const QString &format)
             {
                 Q_UNUSED(format);
                 QGraphicsLayoutItem::updateGeometry();
                 if(presenter()) presenter()->layout()->invalidate();
             }
             QSizeF ChartLogValueAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
             {
                 Q_UNUSED(constraint)
                 QSizeF sh;
                 QSizeF base = HorizontalAxis::sizeHint(which, constraint);
                 QStringList ticksList;
                 qreal logMax = log10(m_axis->max()) / log10(m_axis->base());
                 qreal logMin = log10(m_axis->min()) / log10(m_axis->base());
                 int tickCount = qAbs(ceil(logMax) - ceil(logMin));
                 if (m_axis->max() > m_axis->min() && tickCount > 0)
                     ticksList = createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), tickCount, m_axis->labelFormat());
                 else
                     ticksList.append(QStringLiteral(" "));
                 // Width of horizontal axis sizeHint indicates the maximum distance labels can extend past
                 // first and last ticks. Base width is irrelevant.
                 qreal width = 0;
                 qreal height = 0;
                 switch (which) {
                 case Qt::MinimumSize:{
                     QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(),
                                                                            QStringLiteral("..."),
                                                                            axis()->labelsAngle());
                     width = boundingRect.width() / 2.0;
                     height = boundingRect.height() + labelPadding() + base.height() + 1.0;
                     sh = QSizeF(width, height);
                     break;
                 }
                 case Qt::PreferredSize: {
                     qreal labelHeight = 0.0;
                     qreal firstWidth = -1.0;
                     foreach (const QString& s, ticksList) {
                         QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle());
                         labelHeight = qMax(rect.height(), labelHeight);
                         width = rect.width();
                         if (firstWidth < 0.0)
                             firstWidth = width;
                     }
                     height = labelHeight + labelPadding() + base.height() + 1.0;
                     width = qMax(width, firstWidth) / 2.0;
                     sh = QSizeF(width, height);
                     break;
                 }
                 default:
                     break;
                 }
                 return sh;
             }
             #include "moc_chartlogvalueaxisx_p.cpp"
             QT_CHARTS_END_NAMESPACE

src/charts/axis/logvalueaxis/chartlogvalueaxisy.cpp +2 -4

             /****************************************************************************
             **
             ** Copyright (C) 2014 Digia Plc
             ** All rights reserved.
             ** For any questions to Digia, please use contact form at http://qt.io
             **
             ** This file is part of the Qt Charts module.
             **
             ** Licensees holding valid commercial license for Qt may use this file in
             ** accordance with the Qt License Agreement provided with the Software
             ** or, alternatively, in accordance with the terms contained in a written
             ** agreement between you and Digia.
             **
             ** If you have questions regarding the use of this file, please use
             ** contact form at http://qt.io
             **
             ****************************************************************************/
             #include <private/chartlogvalueaxisy_p.h>
             #include <private/chartpresenter_p.h>
             #include <QtCharts/QLogValueAxis>
             #include <private/abstractchartlayout_p.h>
             #include <QtWidgets/QGraphicsLayout>
             #include <QtCore/QtMath>
             #include <QtCore/QDebug>
             QT_CHARTS_BEGIN_NAMESPACE
             ChartLogValueAxisY::ChartLogValueAxisY(QLogValueAxis *axis, QGraphicsItem *item)
                 : VerticalAxis(axis, item),
                   m_axis(axis)
             {
                 QObject::connect(m_axis, SIGNAL(baseChanged(qreal)), this, SLOT(handleBaseChanged(qreal)));
                 QObject::connect(m_axis, SIGNAL(labelFormatChanged(QString)), this, SLOT(handleLabelFormatChanged(QString)));
             }
             ChartLogValueAxisY::~ChartLogValueAxisY()
             {
             }
             QVector<qreal> ChartLogValueAxisY::calculateLayout() const
             {
                 QVector<qreal> points;
                 qreal logMax = log10(m_axis->max()) / log10(m_axis->base());
                 qreal logMin = log10(m_axis->min()) / log10(m_axis->base());
                 qreal leftEdge = logMin < logMax ? logMin : logMax;
                 qreal ceilEdge = ceil(leftEdge);
                 int tickCount = qAbs(ceil(logMax) - ceil(logMin));
-                points.resize(tickCount + 1);
+                points.resize(tickCount);
                 const QRectF &gridRect = gridGeometry();
                 const qreal deltaY = gridRect.height() / qAbs(logMax - logMin);
-                for (int i = 0; i <= tickCount; ++i)
+                for (int i = 0; i < tickCount; ++i)
                     points[i] = (ceilEdge + qreal(i)) * -deltaY - leftEdge * -deltaY + gridRect.bottom();
                 return points;
             }
             void ChartLogValueAxisY::updateGeometry()
             {
                 const QVector<qreal> &layout = ChartAxisElement::layout();
-                if (layout.isEmpty())
-                    return;
                 setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat()));
                 VerticalAxis::updateGeometry();
             }
             void ChartLogValueAxisY::handleBaseChanged(qreal base)
             {
                 Q_UNUSED(base);
                 QGraphicsLayoutItem::updateGeometry();
                 if(presenter()) presenter()->layout()->invalidate();
             }
             void ChartLogValueAxisY::handleLabelFormatChanged(const QString &format)
             {
                 Q_UNUSED(format);
                 QGraphicsLayoutItem::updateGeometry();
                 if(presenter()) presenter()->layout()->invalidate();
             }
             QSizeF ChartLogValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
             {
                 Q_UNUSED(constraint)
                 QSizeF sh;
                 QSizeF base = VerticalAxis::sizeHint(which, constraint);
                 QStringList ticksList;
                 qreal logMax = log10(m_axis->max()) / log10(m_axis->base());
                 qreal logMin = log10(m_axis->min()) / log10(m_axis->base());
                 int tickCount = qAbs(ceil(logMax) - ceil(logMin));
                 if (m_axis->max() > m_axis->min() && tickCount > 0)
                     ticksList = createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), tickCount, m_axis->labelFormat());
                 else
                     ticksList.append(QStringLiteral(" "));
                 qreal width = 0;
                 // Height of vertical axis sizeHint indicates the maximum distance labels can extend past
                 // first and last ticks. Base height is irrelevant.
                 qreal height = 0;
                 switch (which) {
                 case Qt::MinimumSize: {
                     QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(),
                                                                            QStringLiteral("..."),
                                                                            axis()->labelsAngle());
                     width = boundingRect.width() + labelPadding() + base.width() + 1.0;
                     height = boundingRect.height() / 2.0;
                     sh = QSizeF(width, height);
                     break;
                 }
                 case Qt::PreferredSize: {
                     qreal labelWidth = 0.0;
                     qreal firstHeight = -1.0;
                     foreach (const QString& s, ticksList) {
                         QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle());
                         labelWidth = qMax(rect.width(), labelWidth);
                         height = rect.height();
                         if (firstHeight < 0.0)
                             firstHeight = height;
                     }
                     width = labelWidth + labelPadding() + base.width() + 2.0; //two pixels of tolerance
                     height = qMax(height, firstHeight) / 2.0;
                     sh = QSizeF(width, height);
                     break;
                 }
                 default:
                     break;
                 }
                 return sh;
             }
             #include "moc_chartlogvalueaxisy_p.cpp"
             QT_CHARTS_END_NAMESPACE

src/charts/axis/verticalaxis.cpp +7 -4

             /****************************************************************************
             **
             ** Copyright (C) 2014 Digia Plc
             ** All rights reserved.
             ** For any questions to Digia, please use contact form at http://qt.io
             **
             ** This file is part of the Qt Charts module.
             **
             ** Licensees holding valid commercial license for Qt may use this file in
             ** accordance with the Qt License Agreement provided with the Software
             ** or, alternatively, in accordance with the terms contained in a written
             ** agreement between you and Digia.
             **
             ** If you have questions regarding the use of this file, please use
             ** contact form at http://qt.io
             **
             ****************************************************************************/
             #include <private/verticalaxis_p.h>
             #include <QtCharts/QAbstractAxis>
             #include <private/chartpresenter_p.h>
             #include <QtCore/QDebug>
             QT_CHARTS_BEGIN_NAMESPACE
             VerticalAxis::VerticalAxis(QAbstractAxis *axis, QGraphicsItem *item, bool intervalAxis)
                 : CartesianChartAxis(axis, item, intervalAxis)
             {
             }
             VerticalAxis::~VerticalAxis()
             {
             }
             void VerticalAxis::updateGeometry()
             {
                 const QVector<qreal> &layout = ChartAxisElement::layout();
-                if (layout.isEmpty())
+                if (layout.isEmpty() && axis()->type() != QAbstractAxis::AxisTypeLogValue)
                     return;
                 QStringList labelList = labels();
-                QList<QGraphicsItem *> lines = gridItems();
                 QList<QGraphicsItem *> labels = labelItems();
-                QList<QGraphicsItem *> shades = shadeItems();
                 QList<QGraphicsItem *> arrow = arrowItems();
                 QGraphicsTextItem *title = titleItem();
                 Q_ASSERT(labels.size() == labelList.size());
                 Q_ASSERT(layout.size() == labelList.size());
                 const QRectF &axisRect = axisGeometry();
                 const QRectF &gridRect = gridGeometry();
                 qreal height = axisRect.bottom();
                 //arrow
                 QGraphicsLineItem *arrowItem = static_cast<QGraphicsLineItem*>(arrow.at(0));
                 //arrow position
                 if (axis()->alignment() == Qt::AlignLeft)
                     arrowItem->setLine(axisRect.right(), gridRect.top(), axisRect.right(), gridRect.bottom());
                 else if (axis()->alignment() == Qt::AlignRight)
                     arrowItem->setLine(axisRect.left(), gridRect.top(), axisRect.left(), gridRect.bottom());
                 //title
                 QRectF titleBoundingRect;
                 QString titleText = axis()->titleText();
                 qreal availableSpace = axisRect.width() - labelPadding();
                 if (!titleText.isEmpty() && titleItem()->isVisible()) {
                     availableSpace -= titlePadding() * 2.0;
                     qreal minimumLabelWidth = ChartPresenter::textBoundingRect(axis()->labelsFont(),
                                                                                QStringLiteral("...")).width();
                     qreal titleSpace = availableSpace - minimumLabelWidth;
                     title->setHtml(ChartPresenter::truncatedText(axis()->titleFont(), titleText, qreal(90.0),
                                                                  titleSpace, gridRect.height(),
                                                                  titleBoundingRect));
                     title->setTextWidth(titleBoundingRect.height());
                     titleBoundingRect = title->boundingRect();
                     QPointF center = gridRect.center() - titleBoundingRect.center();
                     if (axis()->alignment() == Qt::AlignLeft)
                         title->setPos(axisRect.left() - titleBoundingRect.width() / 2.0 + titleBoundingRect.height() / 2.0 + titlePadding(), center.y());
                     else if (axis()->alignment() == Qt::AlignRight)
                         title->setPos(axisRect.right() - titleBoundingRect.width() / 2.0 - titleBoundingRect.height() / 2.0 - titlePadding(), center.y());
                     title->setTransformOriginPoint(titleBoundingRect.center());
                     title->setRotation(270);
                     availableSpace -= titleBoundingRect.height();
                 }
+                if (layout.isEmpty() && axis()->type() == QAbstractAxis::AxisTypeLogValue)
+                    return;
+                QList<QGraphicsItem *> lines = gridItems();
+                QList<QGraphicsItem *> shades = shadeItems();
                 for (int i = 0; i < layout.size(); ++i) {
                     //items
                     QGraphicsLineItem *gridItem = static_cast<QGraphicsLineItem *>(lines.at(i));
                     QGraphicsLineItem *tickItem = static_cast<QGraphicsLineItem *>(arrow.at(i + 1));
                     QGraphicsTextItem *labelItem = static_cast<QGraphicsTextItem *>(labels.at(i));
                     //grid line
                     gridItem->setLine(gridRect.left(), layout[i], gridRect.right(), layout[i]);
                     //label text wrapping
                     QString text = labelList.at(i);
                     QRectF boundingRect;
                     // don't truncate empty labels
                     if (text.isEmpty()) {
                         labelItem->setHtml(text);
                     } else {
                         qreal labelHeight = (axisRect.height() / layout.count()) - (2 * labelPadding());
                         QString truncatedText = ChartPresenter::truncatedText(axis()->labelsFont(), text,
                                                                               axis()->labelsAngle(),
                                                                               availableSpace,
                                                                               labelHeight, boundingRect);
                         labelItem->setTextWidth(ChartPresenter::textBoundingRect(axis()->labelsFont(),
                                                                                  truncatedText).width());
                         labelItem->setHtml(truncatedText);
                     }
                     //label transformation origin point
                     const QRectF &rect = labelItem->boundingRect();
                     QPointF center = rect.center();
                     labelItem->setTransformOriginPoint(center.x(), center.y());
                     qreal widthDiff = rect.width() - boundingRect.width();
                     qreal heightDiff = rect.height() - boundingRect.height();
                     //ticks and label position
                     if (axis()->alignment() == Qt::AlignLeft) {
                         labelItem->setPos(axisRect.right() - rect.width() + (widthDiff / 2.0) - labelPadding(), layout[i] - center.y());
                         tickItem->setLine(axisRect.right() - labelPadding(), layout[i], axisRect.right(), layout[i]);
                     } else if (axis()->alignment() == Qt::AlignRight) {
                         labelItem->setPos(axisRect.left() + labelPadding() - (widthDiff / 2.0), layout[i] - center.y());
                         tickItem->setLine(axisRect.left(), layout[i], axisRect.left() + labelPadding(), layout[i]);
                     }
                     //label in between
                     bool forceHide = false;
                     if (intervalAxis() && (i + 1) != layout.size()) {
                         qreal lowerBound = qMin(layout[i], gridRect.bottom());
                         qreal upperBound = qMax(layout[i + 1], gridRect.top());
                         const qreal delta = lowerBound - upperBound;
                         // Hide label in case visible part of the category at the grid edge is too narrow
                         if (delta < boundingRect.height()
                             && (lowerBound == gridRect.bottom() || upperBound == gridRect.top())
                             && !intervalAxis()) {
                             forceHide = true;
                         } else {
                             labelItem->setPos(labelItem->pos().x() , lowerBound - (delta / 2.0) - center.y());
                         }
                     }
                     //label overlap detection - compensate one pixel for rounding errors
                     if (labelItem->pos().y() + boundingRect.height() > height || forceHide ||
                         (labelItem->pos().y() + (heightDiff / 2.0) - 1.0) > axisRect.bottom() ||
                         labelItem->pos().y() + (heightDiff / 2.0) < (axisRect.top() - 1.0)) {
                         labelItem->setVisible(false);
                     }
                     else {
                         labelItem->setVisible(true);
                         height=labelItem->pos().y();
                     }
                     //shades
                     QGraphicsRectItem *shadeItem = 0;
                     if (i == 0)
                         shadeItem = static_cast<QGraphicsRectItem *>(shades.at(0));
                     else if (i % 2)
                         shadeItem = static_cast<QGraphicsRectItem *>(shades.at((i / 2) + 1));
                     if (shadeItem) {
                         qreal lowerBound;
                         qreal upperBound;
                         if (i == 0) {
                             lowerBound = gridRect.bottom();
                             upperBound = layout[0];
                         } else {
                             lowerBound = layout[i];
                             if (i == layout.size() - 1)
                                 upperBound = gridRect.top();
                             else
                                 upperBound = qMax(layout[i + 1], gridRect.top());
                         }
                         shadeItem->setRect(gridRect.left(), upperBound, gridRect.width(),
                                            lowerBound - upperBound);
                         if (shadeItem->rect().height() <= 0.0)
                             shadeItem->setVisible(false);
                         else
                             shadeItem->setVisible(true);
                     }
                     // check if the grid line and the axis tick should be shown
                     qreal y = gridItem->line().p1().y();
                     if ((y < gridRect.top() || y > gridRect.bottom()))
                     {
                         gridItem->setVisible(false);
                         tickItem->setVisible(false);
                     }else{
                         gridItem->setVisible(true);
                         tickItem->setVisible(true);
                     }
                 }
                 //begin/end grid line in case labels between
                 if (intervalAxis()) {
                     QGraphicsLineItem *gridLine;
                     gridLine = static_cast<QGraphicsLineItem *>(lines.at(layout.size()));
                     gridLine->setLine(gridRect.left(), gridRect.top(), gridRect.right(), gridRect.top());
                     gridLine->setVisible(true);
                     gridLine = static_cast<QGraphicsLineItem*>(lines.at(layout.size() + 1));
                     gridLine->setLine(gridRect.left(), gridRect.bottom(), gridRect.right(), gridRect.bottom());
                     gridLine->setVisible(true);
                 }
             }
             QSizeF VerticalAxis::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
             {
                 Q_UNUSED(constraint);
                 QSizeF sh(0, 0);
                 if (axis()->titleText().isEmpty() || !titleItem()->isVisible())
                     return sh;
                 switch (which) {
                 case Qt::MinimumSize: {
                     QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(),
                                                                         QStringLiteral("..."));
                     sh = QSizeF(titleRect.height() + (titlePadding() * 2.0), titleRect.width());
                     break;
                 }
                 case Qt::MaximumSize:
                 case Qt::PreferredSize: {
                     QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(), axis()->titleText());
                     sh = QSizeF(titleRect.height() + (titlePadding() * 2.0), titleRect.width());
                     break;
                 }
                 default:
                     break;
                 }
                 return sh;
             }
             QT_CHARTS_END_NAMESPACE

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