重寫paintEvent事件，代碼如下

```

void xx::paintEvent(QPaintEvent *event){

? QPainter painter(this);

? //繪制x，y軸，_maxWidth為y軸邊距

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

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

? //繪制刻度，_maxMinutes為x軸最大刻度

? 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);

? //繪制數(shù)據(jù)_dataMap，QString（y軸坐標名稱：起始時間-結束時間& 起始時間-結束時間）

? 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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