1 files changed, 10 insertions, 6 deletions
diff --git a/examples/opengl/2dpainting/helper.cpp b/examples/opengl/2dpainting/helper.cpp
index b412dc11dc..168df2aff3 100644
--- a/examples/opengl/2dpainting/helper.cpp
+++ b/examples/opengl/2dpainting/helper.cpp
@@ -38,9 +38,12 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets>
 #include "helper.h"
 
+#include <QPainter>
+#include <QPaintEvent>
+#include <QWidget>
+
 //! [0]
 Helper::Helper()
 {
@@ -70,14 +73,15 @@ void Helper::paint(QPainter *painter, QPaintEvent *event, int elapsed)
     painter->setPen(circlePen);
     painter->rotate(elapsed * 0.030);
 
-    qreal r = elapsed/1000.0;
+    qreal r = elapsed / 1000.0;
     int n = 30;
     for (int i = 0; i < n; ++i) {
         painter->rotate(30);
-        qreal radius = 0 + 120.0*((i+r)/n);
-        qreal circleRadius = 1 + ((i+r)/n)*20;
+        qreal factor = (i + r) / n;
+        qreal radius = 0 + 120.0 * factor;
+        qreal circleRadius = 1 + factor * 20;
         painter->drawEllipse(QRectF(radius, -circleRadius,
-                                    circleRadius*2, circleRadius*2));
+                                    circleRadius * 2, circleRadius * 2));
     }
     painter->restore();
 //! [2]
@@ -85,6 +89,6 @@ void Helper::paint(QPainter *painter, QPaintEvent *event, int elapsed)
 //! [3]
     painter->setPen(textPen);
     painter->setFont(textFont);
-    painter->drawText(QRect(-50, -50, 100, 100), Qt::AlignCenter, "Qt");
+    painter->drawText(QRect(-50, -50, 100, 100), Qt::AlignCenter, QStringLiteral("Qt"));
 }
 //! [3]