Use QRandomGenerator instead of q?rand

Change-Id: Icd0e0d4b27cb4e5eb892fffd14b5285d43f4afbf
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

21 files changed, 47 insertions, 61 deletions

diff --git a/examples/charts/barmodelmapper/customtablemodel.cpp b/examples/charts/barmodelmapper/customtablemodel.cpp
index 23b5271c..2caef9b5 100644
--- a/examples/charts/barmodelmapper/customtablemodel.cpp
+++ b/examples/charts/barmodelmapper/customtablemodel.cpp
@@ -31,13 +31,12 @@
 #include <QtCore/QVector>
 #include <QtCore/QTime>
 #include <QtCore/QRect>
+#include <QtCore/QRandomGenerator>
 #include <QtGui/QColor>
 
 CustomTableModel::CustomTableModel(QObject *parent) :
     QAbstractTableModel(parent)
 {
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
-
     m_columnCount = 6;
     m_rowCount = 12;
 
@@ -46,9 +45,9 @@ CustomTableModel::CustomTableModel(QObject *parent) :
         QVector<qreal>* dataVec = new QVector<qreal>(m_columnCount);
         for (int k = 0; k < dataVec->size(); k++) {
             if (k % 2 == 0)
-                dataVec->replace(k, i * 50 + qrand() % 20);
+                dataVec->replace(k, i * 50 + QRandomGenerator::bounded(20));
             else
-                dataVec->replace(k, qrand() % 100);
+                dataVec->replace(k, QRandomGenerator::bounded(100));
         }
         m_data.append(dataVec);
     }
diff --git a/examples/charts/chartthemes/themewidget.cpp b/examples/charts/chartthemes/themewidget.cpp
index 9739dde1..6f408c75 100644
--- a/examples/charts/chartthemes/themewidget.cpp
+++ b/examples/charts/chartthemes/themewidget.cpp
@@ -49,7 +49,7 @@
 #include <QtWidgets/QCheckBox>
 #include <QtWidgets/QGroupBox>
 #include <QtWidgets/QLabel>
-#include <QtCore/QTime>
+#include <QtCore/QRandomGenerator>
 #include <QtCharts/QBarCategoryAxis>
 
 ThemeWidget::ThemeWidget(QWidget *parent) :
@@ -129,16 +129,13 @@ DataTable ThemeWidget::generateRandomData(int listCount, int valueMax, int value
 {
     DataTable dataTable;
 
-    // set seed for random stuff
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
-
     // generate random data
     for (int i(0); i < listCount; i++) {
         DataList dataList;
         qreal yValue(0);
         for (int j(0); j < valueCount; j++) {
-            yValue = yValue + (qreal)(qrand() % valueMax) / (qreal) valueCount;
-            QPointF value((j + (qreal) rand() / (qreal) RAND_MAX) * ((qreal) m_valueMax / (qreal) valueCount),
+            yValue = yValue + QRandomGenerator::bounded(valueMax / (qreal) valueCount);
+            QPointF value((j + QRandomGenerator::getReal()) * ((qreal) m_valueMax / (qreal) valueCount),
                           yValue);
             QString label = "Slice " + QString::number(i) + ":" + QString::number(j);
             dataList << Data(value, label);
diff --git a/examples/charts/datetimeaxis/main.cpp b/examples/charts/datetimeaxis/main.cpp
index 9a24a649..ca3f4320 100644
--- a/examples/charts/datetimeaxis/main.cpp
+++ b/examples/charts/datetimeaxis/main.cpp
@@ -43,7 +43,6 @@ QT_CHARTS_USE_NAMESPACE
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
 
     //![1]
     QLineSeries *series = new QLineSeries();
diff --git a/examples/charts/dynamicspline/chart.cpp b/examples/charts/dynamicspline/chart.cpp
index 264f2460..9f33423c 100644
--- a/examples/charts/dynamicspline/chart.cpp
+++ b/examples/charts/dynamicspline/chart.cpp
@@ -31,7 +31,7 @@
 #include <QtCharts/QAbstractAxis>
 #include <QtCharts/QSplineSeries>
 #include <QtCharts/QValueAxis>
-#include <QtCore/QTime>
+#include <QtCore/QRandomGenerator>
 #include <QtCore/QDebug>
 
 Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags):
@@ -42,8 +42,6 @@ Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags):
     m_x(5),
     m_y(1)
 {
-    qsrand((uint) QTime::currentTime().msec());
-
     QObject::connect(&m_timer, SIGNAL(timeout()), this, SLOT(handleTimeout()));
     m_timer.setInterval(1000);
 
@@ -73,7 +71,7 @@ void Chart::handleTimeout()
     qreal x = plotArea().width() / m_axis->tickCount();
     qreal y = (m_axis->max() - m_axis->min()) / m_axis->tickCount();
     m_x += y;
-    m_y = qrand() % 5 - 2.5;
+    m_y = QRandomGenerator::bounded(5) - 2.5;
     m_series->append(m_x, m_y);
     scroll(x, 0);
     if (m_x == 100)
diff --git a/examples/charts/modeldata/customtablemodel.cpp b/examples/charts/modeldata/customtablemodel.cpp
index 1bc607be..98cd8c8c 100644
--- a/examples/charts/modeldata/customtablemodel.cpp
+++ b/examples/charts/modeldata/customtablemodel.cpp
@@ -29,15 +29,13 @@
 
 #include "customtablemodel.h"
 #include <QtCore/QVector>
-#include <QtCore/QTime>
+#include <QtCore/QRandomGenerator>
 #include <QtCore/QRect>
 #include <QtGui/QColor>
 
 CustomTableModel::CustomTableModel(QObject *parent) :
     QAbstractTableModel(parent)
 {
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
-
     m_columnCount = 4;
     m_rowCount = 15;
 
@@ -46,9 +44,9 @@ CustomTableModel::CustomTableModel(QObject *parent) :
         QVector<qreal>* dataVec = new QVector<qreal>(m_columnCount);
         for (int k = 0; k < dataVec->size(); k++) {
             if (k % 2 == 0)
-                dataVec->replace(k, i * 50 + qrand() % 20);
+                dataVec->replace(k, i * 50 + QRandomGenerator::bounded(20));
             else
-                dataVec->replace(k, qrand() % 100);
+                dataVec->replace(k, QRandomGenerator::bounded(100));
         }
         m_data.append(dataVec);
     }
diff --git a/examples/charts/nesteddonuts/widget.cpp b/examples/charts/nesteddonuts/widget.cpp
index 35860a01..533b8969 100644
--- a/examples/charts/nesteddonuts/widget.cpp
+++ b/examples/charts/nesteddonuts/widget.cpp
@@ -32,7 +32,7 @@
 #include <QtCharts/QLegend>
 #include <QtCharts/QPieSeries>
 #include <QtCharts/QPieSlice>
-#include <QtCore/QTime>
+#include <QtCore/QRandomGenerator>
 #include <QtWidgets/QGridLayout>
 #include <QtCore/QTimer>
 
@@ -42,7 +42,6 @@ Widget::Widget(QWidget *parent)
     : QWidget(parent)
 {
     setMinimumSize(800, 600);
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
 
     //! [1]
     QChartView *chartView = new QChartView;
@@ -62,9 +61,9 @@ Widget::Widget(QWidget *parent)
     //! [3]
     for (int i = 0; i < donutCount; i++) {
         QPieSeries *donut = new QPieSeries;
-        int sliceCount =  3 + qrand() % 3;
+        int sliceCount =  3 + QRandomGenerator::bounded(3);
         for (int j = 0; j < sliceCount; j++) {
-            qreal value = 100 + qrand() % 100;
+            qreal value = 100 + QRandomGenerator::bounded(100);
             QPieSlice *slice = new QPieSlice(QString("%1").arg(value), value);
             slice->setLabelVisible(true);
             slice->setLabelColor(Qt::white);
@@ -103,7 +102,7 @@ void Widget::updateRotation()
 {
     for (int i = 0; i < m_donuts.count(); i++) {
         QPieSeries *donut = m_donuts.at(i);
-        qreal phaseShift =  -50 + qrand() % 100;
+        qreal phaseShift =  -50 + QRandomGenerator::bounded(100);
         donut->setPieStartAngle(donut->pieStartAngle() + phaseShift);
         donut->setPieEndAngle(donut->pieEndAngle() + phaseShift);
     }
diff --git a/examples/charts/openglseries/datasource.cpp b/examples/charts/openglseries/datasource.cpp
index 291bc722..1448e54e 100644
--- a/examples/charts/openglseries/datasource.cpp
+++ b/examples/charts/openglseries/datasource.cpp
@@ -29,6 +29,7 @@
 
 #include "datasource.h"
 #include <QtCore/QtMath>
+#include <QtCore/QRandomGenerator>
 
 QT_CHARTS_USE_NAMESPACE
 
@@ -118,7 +119,7 @@ void DataSource::generateData(int seriesCount, int rowCount, int colCount)
                 qreal y(0);
                 // data with sin + random component
                 y = height + (yMultiplier * qSin(M_PI / 50 * j)
-                              + (yMultiplier * (qreal) rand() / (qreal) RAND_MAX));
+                              + (yMultiplier * QRandomGenerator::getReal()));
                 // 0.000001 added to make values logaxis compatible
                 x = 0.000001 + 20.0 * (qreal(j) / qreal(colCount)) + (xAdjustment * qreal(i));
                 points.append(QPointF(x, y));
diff --git a/examples/charts/piechartdrilldown/main.cpp b/examples/charts/piechartdrilldown/main.cpp
index 69f87158..bea7fb3c 100644
--- a/examples/charts/piechartdrilldown/main.cpp
+++ b/examples/charts/piechartdrilldown/main.cpp
@@ -31,7 +31,7 @@
 #include "drilldownslice.h"
 #include <QtWidgets/QApplication>
 #include <QtWidgets/QMainWindow>
-#include <QtCore/QTime>
+#include <QtCore/QRandomGenerator>
 #include <QtCharts/QChartView>
 #include <QtCharts/QLegend>
 #include <QtCharts/QPieSeries>
@@ -42,8 +42,6 @@ int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
 
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
-
     QMainWindow window;
 
     DrilldownChart *chart = new DrilldownChart();
@@ -65,7 +63,7 @@ int main(int argc, char *argv[])
         series->setName("Sales by month - " + name);
 
         foreach (QString month, months)
-        *series << new DrilldownSlice(qrand() % 1000, month, yearSeries);
+        *series << new DrilldownSlice(QRandomGenerator::bounded(1000), month, yearSeries);
 
         QObject::connect(series, SIGNAL(clicked(QPieSlice*)), chart, SLOT(handleSliceClicked(QPieSlice*)));
 
diff --git a/examples/charts/qmloscilloscope/datasource.cpp b/examples/charts/qmloscilloscope/datasource.cpp
index f687beb0..1f6c7272 100644
--- a/examples/charts/qmloscilloscope/datasource.cpp
+++ b/examples/charts/qmloscilloscope/datasource.cpp
@@ -33,6 +33,7 @@
 #include <QtQuick/QQuickView>
 #include <QtQuick/QQuickItem>
 #include <QtCore/QDebug>
+#include <QtCore/QRandomGenerator>
 #include <QtCore/QtMath>
 
 QT_CHARTS_USE_NAMESPACE
@@ -82,7 +83,7 @@ void DataSource::generateData(int type, int rowCount, int colCount)
             switch (type) {
             case 0:
                 // data with sin + random component
-                y = qSin(M_PI / 50 * j) + 0.5 + (qreal) rand() / (qreal) RAND_MAX;
+                y = qSin(M_PI / 50 * j) + 0.5 + QRandomGenerator::getReal();
                 x = j;
                 break;
             case 1:
diff --git a/examples/charts/stackedbarchartdrilldown/main.cpp b/examples/charts/stackedbarchartdrilldown/main.cpp
index c3e03505..f4bbc3f0 100644
--- a/examples/charts/stackedbarchartdrilldown/main.cpp
+++ b/examples/charts/stackedbarchartdrilldown/main.cpp
@@ -29,6 +29,7 @@
 
 #include <QtWidgets/QApplication>
 #include <QtWidgets/QMainWindow>
+#include <QtCore/QRandomGenerator>
 #include <QtCharts/QChartView>
 #include <QtCharts/QBarSet>
 #include <QtCharts/QLegend>
@@ -90,7 +91,7 @@ int main(int argc, char *argv[])
         for (int month = 0; month < months.count(); month++) {
             QBarSet *weeklyCrop = new QBarSet(plant);
             for (int week = 0; week < weeks.count(); week++)
-                *weeklyCrop << (qrand() % 20);
+                *weeklyCrop << QRandomGenerator::bounded(20);
             // Get the drilldown series from season series and add crop to it.
             seasonSeries->drilldownSeries(month)->append(weeklyCrop);
             *monthlyCrop << weeklyCrop->sum();
diff --git a/examples/charts/zoomlinechart/main.cpp b/examples/charts/zoomlinechart/main.cpp
index 6a80982b..b3c6a33f 100644
--- a/examples/charts/zoomlinechart/main.cpp
+++ b/examples/charts/zoomlinechart/main.cpp
@@ -32,6 +32,7 @@
 #include <QtWidgets/QApplication>
 #include <QtWidgets/QMainWindow>
 #include <QtCore/QtMath>
+#include <QtCore/QRandomGenerator>
 #include <QtCharts/QLineSeries>
 #include <QtCharts/QValueAxis>
 
@@ -45,7 +46,7 @@ int main(int argc, char *argv[])
     QLineSeries *series = new QLineSeries();
     for (int i = 0; i < 500; i++) {
         QPointF p((qreal) i, qSin(M_PI / 50 * i) * 100);
-        p.ry() += qrand() % 20;
+        p.ry() += QRandomGenerator::bounded(20);
         *series << p;
     }
 //![1]
diff --git a/src/charts/chartthememanager.cpp b/src/charts/chartthememanager.cpp
index 2840b132..6d6f6cb7 100644
--- a/src/charts/chartthememanager.cpp
+++ b/src/charts/chartthememanager.cpp
@@ -28,7 +28,6 @@
 ****************************************************************************/
 #include <private/qabstractseries_p.h>
 #include <private/qabstractaxis_p.h>
-#include <QtCore/QTime>
 //themes
 #include <private/chartthemesystem_p.h>
 #include <private/chartthemelight_p.h>
@@ -45,7 +44,6 @@ QT_CHARTS_BEGIN_NAMESPACE
 ChartThemeManager::ChartThemeManager(QChart* chart) :
     m_chart(chart)
 {
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
 }
 
 
diff --git a/tests/auto/qxyseries/tst_qxyseries.cpp b/tests/auto/qxyseries/tst_qxyseries.cpp
index 767caca2..f55f5147 100644
--- a/tests/auto/qxyseries/tst_qxyseries.cpp
+++ b/tests/auto/qxyseries/tst_qxyseries.cpp
@@ -325,7 +325,7 @@ void tst_QXYSeries::remove_raw()
     // (simulate e.g. spamming a hypothetical "remove last point"-button)
     QList<QPointF> bunchOfPoints;
     for (int i = 0; i < 10; i++)
-        bunchOfPoints.append(QPointF(i, (qreal) rand() / (qreal) RAND_MAX));
+        bunchOfPoints.append(QPointF(i, QRandomGenerator::getReal()));
     m_series->replace(bunchOfPoints);
     QCOMPARE(m_series->points(), bunchOfPoints);
     QTest::qWait(1500); // Wait for append animations to be over
@@ -337,7 +337,7 @@ void tst_QXYSeries::remove_raw()
 
     // Removal using index
     for (int i = 0; i < 10; i++)
-        bunchOfPoints.append(QPointF(i, (qreal) rand() / (qreal) RAND_MAX));
+        bunchOfPoints.append(QPointF(i, QRandomGenerator::getReal()));
     m_series->replace(bunchOfPoints);
     m_series->remove(5);
     m_series->remove(0);
@@ -350,7 +350,7 @@ void tst_QXYSeries::remove_raw()
 
     // Multiple removal using index
     for (int i = 0; i < 10; i++)
-        bunchOfPoints.append(QPointF(i, (qreal) rand() / (qreal) RAND_MAX));
+        bunchOfPoints.append(QPointF(i, QRandomGenerator::getReal()));
     m_series->replace(bunchOfPoints);
     m_series->removePoints(5, 2);
     m_series->removePoints(0, 3);
@@ -463,7 +463,7 @@ void tst_QXYSeries::replace_raw()
     // Replace all points
     QList<QPointF> allPoints;
     for (int i = 0; i < 10; i++)
-        allPoints.append(QPointF(i, (qreal) rand() / (qreal) RAND_MAX));
+        allPoints.append(QPointF(i, QRandomGenerator::getReal()));
     m_series->replace(allPoints);
     TRY_COMPARE(pointReplacedSpy.count(), points.count());
     TRY_COMPARE(pointsReplacedSpy.count(), 1);
diff --git a/tests/manual/barcharttester/chart-widget.cpp b/tests/manual/barcharttester/chart-widget.cpp
index 6e7157b1..3c58f5ce 100644
--- a/tests/manual/barcharttester/chart-widget.cpp
+++ b/tests/manual/barcharttester/chart-widget.cpp
@@ -40,7 +40,6 @@
 #include <QtCharts/QHorizontalStackedBarSeries>
 #include <QtCharts/QPercentBarSeries>
 #include <QtCharts/QStackedBarSeries>
-#include <QtCore/QTime>
 #include <QElapsedTimer>
 #include <QDebug>
 
@@ -152,8 +151,6 @@ ChartWidget::ChartWidget(QWidget *parent) :
         series->setBarWidth(barWidth);
     }
 
-    qsrand((uint) QTime::currentTime().msec());
-
     resize(800, 300);
     m_horizontalLayout = new QHBoxLayout(this);
     m_horizontalLayout->setSpacing(6);
diff --git a/tests/manual/candlesticktester/mainwidget.cpp b/tests/manual/candlesticktester/mainwidget.cpp
index 9c902a3f..f45a7793 100644
--- a/tests/manual/candlesticktester/mainwidget.cpp
+++ b/tests/manual/candlesticktester/mainwidget.cpp
@@ -35,6 +35,7 @@
 #include <QtCharts/QValueAxis>
 #include <QtCore/QDateTime>
 #include <QtCore/QDebug>
+#include <QtCore/QRandomGenerator>
 #include <QtWidgets/QCheckBox>
 #include <QtWidgets/QComboBox>
 #include <QtWidgets/QDoubleSpinBox>
@@ -64,8 +65,6 @@ MainWidget::MainWidget(QWidget *parent)
       m_customDecreasingColor(false),
       m_hModelMapper(new QHCandlestickModelMapper(this))
 {
-    qsrand(QDateTime::currentDateTime().toTime_t());
-
     m_chartView->setRenderHint(QPainter::Antialiasing, false);
 
     m_hModelMapper->setModel(new CustomTableModel(this));
@@ -285,7 +284,9 @@ QGridLayout *MainWidget::createModelMapperControlsLayout()
 
 qreal MainWidget::randomValue(int min, int max) const
 {
-    return (qrand() / (qreal(RAND_MAX) + 1)) * ((qMax(min, max) - qMin(min, max)) + qMin(min, max));
+    if (min > max)
+        qSwap(min, max);
+    return QRandomGenerator::bounded(min, max);
 }
 
 QCandlestickSet *MainWidget::randomSet(qreal timestamp)
diff --git a/tests/manual/chartviewer/model.h b/tests/manual/chartviewer/model.h
index fcc53724..5db91e8e 100644
--- a/tests/manual/chartviewer/model.h
+++ b/tests/manual/chartviewer/model.h
@@ -33,8 +33,8 @@
 #include <QtCore/QList>
 #include <QtCore/QPair>
 #include <QtCore/QPointF>
+#include <QtCore/QRandomGenerator>
 #include <QtCore/QTime>
-#include <stdlib.h>
 
 typedef QPair<QPointF, QString> Data;
 typedef QList<Data> DataList;
@@ -51,17 +51,14 @@ public:
     {
         DataTable dataTable;
 
-        // set seed for random stuff
-        qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
-
         // generate random data
         for (int i(0); i < listCount; i++) {
             DataList dataList;
             qreal yValue(0.1);
             for (int j(0); j < valueCount; j++) {
-                yValue = yValue + (qreal)(qrand() % valueMax) / (qreal) valueCount;
+                yValue = yValue + QRandomGenerator::bounded(valueMax / (qreal) valueCount);
                 QPointF value(
-                    (j + (qreal) qrand() / (qreal) RAND_MAX)
+                    (j + QRandomGenerator::getReal())
                     * ((qreal) valueMax / (qreal) valueCount), yValue);
                 QString label = "Slice " + QString::number(i) + ":" + QString::number(j);
                 dataList << Data(value, label);
diff --git a/tests/manual/chartwidgettest/mainwidget.cpp b/tests/manual/chartwidgettest/mainwidget.cpp
index c471d0bc..2850de0e 100644
--- a/tests/manual/chartwidgettest/mainwidget.cpp
+++ b/tests/manual/chartwidgettest/mainwidget.cpp
@@ -50,6 +50,7 @@
 #include <QtWidgets/QMessageBox>
 #include <qmath.h>
 #include <QtCore/QDebug>
+#include <QtCore/QRandomGenerator>
 #include <QtGui/QStandardItemModel>
 #include <QtCharts/QBarCategoryAxis>
 #include <QtWidgets/QOpenGLWidget>
@@ -218,9 +219,9 @@ QList<RealList> MainWidget::generateTestData(int columnCount, int rowCount, QStr
             if (dataCharacteristics == "Sin") {
                 newColumn.append(std::abs(sin(M_PI / 50 * i) * 100));
             } else if (dataCharacteristics == "Sin + random") {
-                newColumn.append(std::abs(sin(M_PI / 50 * i) * 100) + (rand() % 5));
+                newColumn.append(std::abs(sin(M_PI / 50 * i) * 100) + QRandomGenerator::bounded(5));
             } else if (dataCharacteristics == "Random") {
-                newColumn.append(rand() % 10 + (qreal) rand() / (qreal) RAND_MAX);
+                newColumn.append(QRandomGenerator::bounded(11.0));
             } else if (dataCharacteristics == "Linear") {
                 //newColumn.append(i * (j + 1.0));
                 // TODO: temporary hack to make pie work; prevent zero values:
diff --git a/tests/manual/openglseriestest/datasource.cpp b/tests/manual/openglseriestest/datasource.cpp
index 4017676b..29d7e2ba 100644
--- a/tests/manual/openglseriestest/datasource.cpp
+++ b/tests/manual/openglseriestest/datasource.cpp
@@ -29,6 +29,7 @@
 
 #include "datasource.h"
 #include <QtCore/QtMath>
+#include <QtCore/QRandomGenerator>
 
 QT_CHARTS_USE_NAMESPACE
 
@@ -118,7 +119,7 @@ void DataSource::generateData(int seriesIndex, int rowCount, int colCount)
             qreal y(0);
             // data with sin + random component
             y = height + (yMultiplier * qSin(M_PI / 50 * j)
-                          + (yMultiplier * (qreal) rand() / (qreal) RAND_MAX));
+                          + (yMultiplier * QRandomGenerator::getReal()));
             // 0.000001 added to make values logaxis compatible
             x = 0.000001 + 20.0 * (qreal(j) / qreal(colCount)) + (xAdjustment * qreal(i));
             points.append(QPointF(x, y));
diff --git a/tests/manual/openglseriestest/mainwindow.cpp b/tests/manual/openglseriestest/mainwindow.cpp
index 4aaeed13..2d59f18c 100644
--- a/tests/manual/openglseriestest/mainwindow.cpp
+++ b/tests/manual/openglseriestest/mainwindow.cpp
@@ -36,6 +36,7 @@
 #include <QtCharts/QDateTimeAxis>
 #include <QtCharts/QCategoryAxis>
 #include <QtCharts/QChart>
+#include <QtCore/QRandomGenerator>
 #include <QtCore/QDebug>
 #include <QtCore/QDateTime>
 
@@ -548,7 +549,7 @@ void MainWindow::addSeries(bool gl)
 
     if (m_seriesList.size() < maxSeriesCount) {
         QXYSeries *series;
-        if (qrand() % 2) {
+        if (QRandomGenerator::bounded(2)) {
             series = new QLineSeries;
             series->setPen(QPen(QBrush(color), width));
         } else {
diff --git a/tests/manual/presenterchart/chartview.cpp b/tests/manual/presenterchart/chartview.cpp
index 4bbf8080..86d144ad 100644
--- a/tests/manual/presenterchart/chartview.cpp
+++ b/tests/manual/presenterchart/chartview.cpp
@@ -32,7 +32,7 @@
 #include <QtCharts/QScatterSeries>
 #include <QtCharts/QSplineSeries>
 #include <QtCharts/QAreaSeries>
-#include <QtCore/QTime>
+#include <QtCore/QRandomGenerator>
 
 ChartView::ChartView(QChart *chart, QWidget *parent)
     : QChartView(chart, parent),
@@ -62,7 +62,7 @@ ChartView::ChartView(QChart *chart, QWidget *parent)
     int numPoints = 10;
 
     for (int x = 0; x <= numPoints; ++x) {
-        qreal y = qrand() % 100;
+        qreal y = QRandomGenerator::bounded(100);
         series0->append(x, y);
         series1->append(x, y);
         series2->append(x, y);
diff --git a/tests/manual/wavechart/wavechart.cpp b/tests/manual/wavechart/wavechart.cpp
index 72e5e737..522d2a7c 100644
--- a/tests/manual/wavechart/wavechart.cpp
+++ b/tests/manual/wavechart/wavechart.cpp
@@ -29,6 +29,7 @@
 
 #include "wavechart.h"
 #include <qmath.h>
+#include <qrandom.h>
 
 QT_CHARTS_USE_NAMESPACE
 
@@ -46,9 +47,6 @@ WaveChart::WaveChart(QChart* chart, QWidget* parent) :
 
     chart->legend()->setVisible(false);
 
-    QTime now = QTime::currentTime();
-    qsrand((uint) now.msec());
-
     int fluctuate = 100;
 
     for (qreal x = 0; x <= 2 * M_PI; x += m_step) {
@@ -69,7 +67,7 @@ void WaveChart::update()
     int fluctuate;
     const QList<QPointF>& points = m_series->points();
     for (qreal i = 0, x = 0; x <= 2 * M_PI; x += m_step, i++) {
-        fluctuate = qrand() % 100;
+        fluctuate = QRandomGenerator::bounded(100);
         m_series->replace(x,points[i].y(),x,fabs(sin(x) * fluctuate));
 
     }