Qt 4.3: scribblewidget.cpp Example File (qtopiacore/mousecalibration/scribblewidget.cpp)

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# scribblewidget.cpp Example File
qtopiacore/mousecalibration/scribblewidget.cpp

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     #include "scribblewidget.h"

     ScribbleWidget::ScribbleWidget(QWidget *parent)
         : QWidget(parent)
     {
         scribbling = false;
     }

     void ScribbleWidget::resizeEvent(QResizeEvent *e)
     {
         image = QImage(e->size(), QImage::Format_RGB32);
         image.fill(QColor(Qt::white).rgb());
     }

     void ScribbleWidget::mousePressEvent(QMouseEvent *event)
     {
         if (event->button() != Qt::LeftButton)
             return;

         lastPoint = event->pos();
         scribbling = true;
     }

     void ScribbleWidget::mouseMoveEvent(QMouseEvent *event)
     {
         if ((event->buttons() & Qt::LeftButton) && scribbling)
             drawLineTo(event->pos());
     }

     void ScribbleWidget::mouseReleaseEvent(QMouseEvent *event)
     {
         if (event->button() == Qt::LeftButton && scribbling) {
             drawLineTo(event->pos());
             scribbling = false;
         }
     }

     void ScribbleWidget::paintEvent(QPaintEvent *)
     {
         QPainter painter(this);
         painter.drawImage(QPoint(0, 0), image);
     }

     void ScribbleWidget::drawLineTo(const QPoint &endPoint)
     {
         QPainter painter(&image);
         painter.setPen(QPen(Qt::blue, 1, Qt::SolidLine,
                             Qt::RoundCap, Qt::RoundJoin));
         painter.drawLine(lastPoint, endPoint);
         update();
         lastPoint = endPoint;
     }