Change almost all other uses of qrand() to QRandomGenerator

The vast majority is actually switched to QRandomGenerator::bounded(),
which gives a mostly uniform distribution over the [0, bound)
range. There are very few floating point cases left, as many of those
that did use floating point did not need to, after all. (I did leave
some that were too ugly for me to understand)

This commit also found a couple of calls to rand() instead of qrand().

This commit does not include changes to SSL code that continues to use
qrand() (job for someone else):
  src/network/ssl/qsslkey_qt.cpp
  src/network/ssl/qsslsocket_mac.cpp
  tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp

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

2 files changed, 8 insertions, 8 deletions

diff --git a/examples/widgets/graphicsview/collidingmice/main.cpp b/examples/widgets/graphicsview/collidingmice/main.cpp
index a0659b9bc1..91aee70b86 100644
--- a/examples/widgets/graphicsview/collidingmice/main.cpp
+++ b/examples/widgets/graphicsview/collidingmice/main.cpp
@@ -60,7 +60,6 @@ static const int MouseCount = 7;
 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);
-    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));
 //! [0]
 
 //! [1]
diff --git a/examples/widgets/graphicsview/collidingmice/mouse.cpp b/examples/widgets/graphicsview/collidingmice/mouse.cpp
index 298e4aae64..14f887f6e3 100644
--- a/examples/widgets/graphicsview/collidingmice/mouse.cpp
+++ b/examples/widgets/graphicsview/collidingmice/mouse.cpp
@@ -52,6 +52,7 @@
 
 #include <QGraphicsScene>
 #include <QPainter>
+#include <QRandomGenerator>
 #include <QStyleOption>
 #include <qmath.h>
 
@@ -70,9 +71,9 @@ static qreal normalizeAngle(qreal angle)
 //! [0]
 Mouse::Mouse()
     : angle(0), speed(0), mouseEyeDirection(0),
-      color(qrand() % 256, qrand() % 256, qrand() % 256)
+      color(QRandomGenerator::global()->bounded(256), QRandomGenerator::global()->bounded(256), QRandomGenerator::global()->bounded(256))
 {
-    setRotation(qrand() % (360 * 16));
+    setRotation(QRandomGenerator::global()->bounded(360 * 16));
 }
 //! [0]
 
@@ -185,16 +186,16 @@ void Mouse::advance(int step)
 
     // Add some random movement
 //! [10]
-    if (dangerMice.size() > 1 && (qrand() % 10) == 0) {
-        if (qrand() % 1)
-            angle += (qrand() % 100) / 500.0;
+    if (dangerMice.size() > 1 && QRandomGenerator::global()->bounded(10) == 0) {
+        if (QRandomGenerator::global()->bounded(1))
+            angle += QRandomGenerator::global()->bounded(1 / 500.0);
         else
-            angle -= (qrand() % 100) / 500.0;
+            angle -= QRandomGenerator::global()->bounded(1 / 500.0);
     }
 //! [10]
 
 //! [11]
-    speed += (-50 + qrand() % 100) / 100.0;
+    speed += (-50 + QRandomGenerator::global()->bounded(100)) / 100.0;
 
     qreal dx = ::sin(angle) * 10;
     mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5;