重写paintEvent事件，代码如下

```

void xx::paintEvent(QPaintEvent *event){

  QPainter painter(this);

  //绘制x，y轴，_maxWidth为y轴边距

  painter.drawLine(QPoint(_maxWidth,20),QPoint(width(),20));

  painter.drawLine(QPoint(_maxWidth, 20), QPoint(_maxWidth,height()));

  //绘制刻度，_maxMinutes为x轴最大刻度

  int num = (_maxMinutes - _minMinutes) / 5;

  int interval = (width() - _maxWidth) / num;

  for (int index = 0; index != num;++index){

    painter.drawLine(QPoint(_maxWidth + index * interval, 20), QPoint(_maxWidth + index * interval, 15));

    painter.drawText(QPoint(_maxWidth + index * interval, 10), QString::number(_minMinutes + index*5));

  }

  num = _dataMap.size();

  interval = (height() - 20) / (num + 2);

  //绘制数据_dataMap，QString（y轴坐标名称：起始时间-结束时间& 起始时间-结束时间）

  QMap<int, QString>::iterator it = _dataMap.begin();

  int index = 1;

  for (; it != _dataMap.end(); ++it){

    QStringList list = it.value().split(":");

    if (list.size() != 2) continue;

    painter.drawText(QPoint(0, 20 + interval * index), list[0]);

    painter.drawLine(QPoint(_maxWidth, 20 + interval * index), QPoint(_maxWidth  + 5, 20 + interval * index));

    for each (QString var in list[1].split("&")){

      if (var.isEmpty()) continue;

      QStringList interalList = var.split("-");

      if (interalList.size() != 2) continue;

      int x = (interalList[0].toDouble() / _maxMinutes) * (width() - _maxWidth);

      int x1 = (interalList[1].toDouble() / _maxMinutes) * (width() - _maxWidth);

      painter.drawLine(QPoint(_maxWidth + x, 20 + interval * index), QPoint(_maxWidth + x1, 20 + interval * index));

    }

    ++index;

  }

}

```

效果如下

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