QPainter::begin: Painter already active

QT一直输出打印 QPainter::begin: Painter already active

QPainter::begin: Painter already active
QPainter::begin: Painter already active
QPainter::begin: Painter already active
QPainter::begin: Painter already active
QPainter::begin: Painter already active
QPainter::begin: Painter already active
QPainter::begin: Painter already active

重新实现paintEvent函数时，如果使用QPainter painter(this);，再使用begin、end则会重复包含QPainter

如下程序，是错在不断输出的问题

void arrivedstation::paintEvent(QPaintEvent *event)
{QPainter painter(this);QColor color(0,0,0,255);QPen pen;pen.setWidth(4);pen.setColor(color);painter.setPen(pen);painter.begin(this);painter.drawLine(QPoint(560,55),QPoint(620,55));painter.drawLine(QPoint(590,45),QPoint(620,55));painter.drawLine(QPoint(590,65),QPoint(620,55));painter.end();
}

修改后的程序

void arrivedstation::paintEvent(QPaintEvent *event)
{QPainter painter(this);QColor color(0,0,0,255);QPen pen;pen.setWidth(4);pen.setColor(color);painter.setPen(pen);//painter.begin(this);painter.drawLine(QPoint(560,55),QPoint(620,55));painter.drawLine(QPoint(590,45),QPoint(620,55));painter.drawLine(QPoint(590,65),QPoint(620,55));//painter.end();
}

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