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>

3 files changed, 7 insertions, 14 deletions

diff --git a/examples/widgets/doc/src/collidingmice-example.qdoc b/examples/widgets/doc/src/collidingmice-example.qdoc
index 02417ba521..535057bb6a 100644
--- a/examples/widgets/doc/src/collidingmice-example.qdoc
+++ b/examples/widgets/doc/src/collidingmice-example.qdoc
@@ -80,8 +80,7 @@
     \snippet graphicsview/collidingmice/mouse.cpp 0
 
     To calculate the various components of the mouse's color, we use
-    the global qrand() function which is a thread-safe version of the
-    standard C++ rand() function.
+    \l QRandomGenerator.
 
     Then we call the \l {QGraphicsItem::setRotation()}{setRotation()} function
     inherited from QGraphicsItem. Items live in their own local
@@ -178,12 +177,7 @@
 
     \snippet graphicsview/collidingmice/main.cpp 0
 
-    First, we create an application object and call the global
-    qsrand() function to specify the seed used to generate a new
-    random number sequence of pseudo random integers with the
-    previously mentioned qrand() function.
-
-    Then it is time to create the scene:
+    First, we create an application object and create the scene:
 
     \snippet graphicsview/collidingmice/main.cpp 1
 
diff --git a/examples/widgets/doc/src/dragdroprobot.qdoc b/examples/widgets/doc/src/dragdroprobot.qdoc
index ac221ec5f9..f74b898e1b 100644
--- a/examples/widgets/doc/src/dragdroprobot.qdoc
+++ b/examples/widgets/doc/src/dragdroprobot.qdoc
@@ -257,7 +257,7 @@
     \snippet graphicsview/dragdroprobot/coloritem.cpp 0
 
     \c ColorItem's constructor assigns an opaque random color to its color
-    member by making use of qrand(). For improved usability, it assigns a
+    member by making use of \l QRandomGenerator. For improved usability, it assigns a
     tooltip that provides a useful hint to the user, and it also sets a
     suitable cursor. This ensures that the cursor will chance to
     Qt::OpenHandCursor when the mouse pointer hovers over the item.
diff --git a/examples/widgets/doc/src/elasticnodes.qdoc b/examples/widgets/doc/src/elasticnodes.qdoc
index 09ac891b24..65e1195121 100644
--- a/examples/widgets/doc/src/elasticnodes.qdoc
+++ b/examples/widgets/doc/src/elasticnodes.qdoc
@@ -424,9 +424,8 @@
     \section1 The main() Function
 
     In contrast to the complexity of the rest of this example, the \c main()
-    function is very simple: We create a QApplication instance, seed the
-    randomizer using qsrand(), and then create and show an instance of \c
-    GraphWidget. Because all nodes in the grid are moved initially, the \c
-    GraphWidget timer will start immediately after control has returned to the
-    event loop.
+    function is very simple: We create a QApplication instance, then create and
+    show an instance of \c GraphWidget. Because all nodes in the grid are moved
+    initially, the \c GraphWidget timer will start immediately after control
+    has returned to the event loop.
 */