//------------绘制虚线--------------
QPen pen;
QVector<qreal>dashes;
qreal space = 4;
dashes << 3 << space;
pen.setDashPattern(dashes);
painter.setPen(pen);
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//------------绘制虚线--------------
QPen pen;
QVector<qreal>dashes;
qreal space = 4;
dashes << 3 << space;
pen.setDashPattern(dashes);
painter.setPen(pen);