qt绘制甘特图

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,),QPoint(width(),));
  painter.drawLine(QPoint(_maxWidth, ), QPoint(_maxWidth,height()));
  //绘制刻度，_maxMinutes为x轴最大刻度
  int num = (_maxMinutes - _minMinutes) / ;
  int interval = (width() - _maxWidth) / num;

  for (int index = ; index != num;++index){
    painter.drawLine(QPoint(_maxWidth + index * interval, ), QPoint(_maxWidth + index * interval, ));
    painter.drawText(QPoint(_maxWidth + index * interval, ), QString::number(_minMinutes + index*));
  }

  num = _dataMap.size();
  interval = (height() - ) / (num + );
  //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 = ;
  for (; it != _dataMap.end(); ++it){
    QStringList list = it.value().split(":");
    if (list.size() != ) continue;

    painter.drawText(QPoint(,  + interval * index), list[]);
    painter.drawLine(QPoint(_maxWidth,  + interval * index), QPoint(_maxWidth  + ,  + interval * index));

    for each (QString var in list[].split("&")){
      if (var.isEmpty()) continue;
      QStringList interalList = var.split("-");
      if (interalList.size() != ) continue;
      int x = (interalList[].toDouble() / _maxMinutes) * (width() - _maxWidth);
      int x1 = (interalList[].toDouble() / _maxMinutes) * (width() - _maxWidth);
      painter.drawLine(QPoint(_maxWidth + x,  + interval * index), QPoint(_maxWidth + x1,  + interval * index));
    }

    ++index;
  }
}

效果如下

原文来自微信公众号"程序员成长日志",已经工作的程序员朋友可以关注下公众号“程序员成长日志”，分享日常工作中解决的问题即可赚取稿费，大家一起成长~