qt画旋转的带箭头的线段

tesb::tesb(QWidget *parent): QWidget(parent)
{ui.setupUi(this);
}void tesb::DrawCustomLine(QPainter& _painter, double _angle, double _len, const QString& _name, const QColor& _color)
{// 初始化_painter.resetTransform(); // 重设画笔_painter.translate(QPoint(300,300));_painter.setPen(QPen(Qt::black, 2));// 绘制线段QLine _line(QPoint(0,0), QPoint(_len,0));_painter.rotate(_angle);_painter.drawLine(_line);// 绘制箭头int off_x = 10;QPainterPath _path;_path.moveTo(_len-off_x, -5);_path.lineTo(_len,0);_path.lineTo(_len-off_x,5);_painter.drawPath(_path);// 绘制名称_painter.setPen(_color);QFont _font = _painter.font();_font.setPointSize(10);_font.setBold(true);_painter.setFont(_font);_painter.drawText(QPoint(_len-2*off_x,-10), _name);
}void tesb::paintEvent( QPaintEvent *ev )
{QPainter _painter(this);_painter.setPen(QPen(Qt::black, 2));// 反锯齿_painter.setRenderHint(QPainter::Antialiasing);// 将画笔中心点移动至(300,300)_painter.translate(QPoint(300,300));// 绘制中心点_painter.drawPoint(QPoint(0,0));// 绘制外圆_painter.drawEllipse(QRect(-150,-150,300,300));DrawCustomLine(_painter, 0, 150, "Da", Qt::red);DrawCustomLine(_painter, 123.5, 130, "Db", Qt::green);DrawCustomLine(_painter, -45, 30, "Dc", Qt::blue);DrawCustomLine(_painter, -145, 60, "Dd", Qt::yellow);QWidget::paintEvent(ev);
}

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