diff options
Diffstat (limited to 'examples/opengl/2dpainting/helper.cpp')
-rw-r--r-- | examples/opengl/2dpainting/helper.cpp | 16 |
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] |