1 #include <QPainter>

     2 #include <QPen>

     3 #include "pixlabel.h"

     4 

     5 PixLabel::PixLabel()

     6         : QLabel(0)

     7 {

     8 

     9 }

    10 

    11 void PixLabel::paintEvent(QPaintEvent * event)

    12 {

    13     QLabel::paintEvent(event);

    14     QPainter p(this);

    15 

    16     p.fillRect(QRect(0, 0, 1024, 512), QBrush(Qt::black));

    17 

    18     if (rects.size())

    19     {

    20         p.setPen(QPen(Qt::lightGray));

    21         QVector<QPoint> centers;

    22         for(QList<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it)

    23             centers.push_back((*it).center());

    24         p.drawPolyline(QPolygon(centers));

    25 

    26         p.setPen(QPen(Qt::white));

    27         p.drawRects(rects.toVector());

    28 

    29         p.setPen(QPen(Qt::yellow));

    30         p.drawRect(rects.last());

    31     }

    32 }

    33 

    34 void PixLabel::mousePressEvent(QMouseEvent * e)

    35 {

    36     if (!rects.empty())

    37     {

    38         if (e->button() == Qt::LeftButton)

    39             rects[rects.size() - 1].moveTopLeft(QPoint(e->x(), e->y()));

    40         else

    41         if (e->button() == Qt::RightButton)

    42             rects[rects.size() - 1].setBottomRight(QPoint(e->x(), e->y()));

    43         repaint();

    44     }

    45 }

    46 

    47 void PixLabel::AddRect()

    48 {

    49     rects.push_back(QRect(0, 0, 1, 1));

    50     repaint();

    51 }