使用Qt开发绘制多个设备的流量曲线图(附带项目图)

1 //消息过滤，主要用于重绘子控件，过滤Paint事件
2 bool QAPRTCurWidget::eventFilter(QObject *watched, QEvent *event)
3 {
4     if(watched==ui->widget_rxtx && event->type()==QEvent::Paint)
5     {
6         updateWidgetRTX();
7     }
8     return QFrame::eventFilter(watched,event);
9 }

 1 //绘图操作
 2 void QAPRTCurWidget::updateWidgetRTX()
 3 {
 4     QPainter painter(ui->widget_rxtx);
 5     painter.setFont(QFont("Times", 12, QFont::Bold));
 6     //绘制背景颜色
 7     painterBackground(painter);
 8     //画最左边一条虚线，用于和List隔开
 9     painterLeftDashLine(painter);
10     //画纵坐标文本标识
11     updateVTextID(painter);
12     //画纵坐标文本刻度以及横纵坐标轴
13     updateVTextMarkAndCoord(painter);
14     //画RX曲线
15     paintRXLineInfo(painter);
16     //画TX曲线
17     paintTXLineInfo(painter);
18 }

 1 //画纵坐标文本刻度以及横纵坐标轴
 2 void QAPRTCurWidget::updateVTextMarkAndCoord(QPainter &painter)
 3 {
 4     painter.save();
 5     //绘图区间的实际高度(部件高度-顶部间隔-底部间隔)
 6     int nActPaintHeight = ui->widget_rxtx->height()-INTERVAL_WIDGET_TOP-INTERVAL_WIDGET_BOTTOM;
 7     //每隔的间隔高度
 8     float fIntervalHeight = ((float)nActPaintHeight)/(m_nVSingleLinePointCount-1);
 9     float fYPointForZero = ui->widget_rxtx->height()-INTERVAL_WIDGET_BOTTOM;
10     double dDivideValue = 0;
11     if(ui->toolButton_rxflow->isChecked())
12     {
13         dDivideValue = ((double)nRXMaxValue)/(m_nVSingleLinePointCount-1);
14     }
15     if(ui->toolButton_txflow->isChecked())
16     {
17         dDivideValue = ((double)nTXMaxValue)/(m_nVSingleLinePointCount-1);
18     }
19     for(int nIndex=0;nIndex<m_nVSingleLinePointCount;++nIndex)
20     {
21         //设置文本颜色
22         painter.setPen(TEXTCOLOR_WIDGET_PAINT);
23         //将原来的字体变小，设置为8
24         QFont objFont = painter.font();
25         objFont.setPointSize(8);
26         painter.setFont(objFont);
27         //画文本，加3的目的是为了是其和横线能保持中间持平
28         painter.drawText(INTERVAL_VMARK_LEFT,fYPointForZero-nIndex*fIntervalHeight+3,QCommonOP::getKMStrForBit(dDivideValue*nIndex));
29         //设置横线颜色
30         painter.setPen(COORDCOLOR_WIDGET_PAINT);
31         //画横线(第一条和最后一条为实线,中间的为虚线)
32         QPen objPen = painter.pen();
33         if(0==nIndex || (m_nVSingleLinePointCount-1)==nIndex)
34         {
35            objPen.setStyle(Qt::SolidLine);
36         }
37         else
38         {
39             objPen.setStyle(Qt::DashLine);
40         }
41         painter.setPen(objPen);
42         float x1 = ui->widget_rxtx->width()-INTERVAL_WIDGET_RIGHT;
43         float y1 = fYPointForZero-nIndex*fIntervalHeight;
44         painter.drawLine(INTERVAL_HCOORD_LEFT,fYPointForZero-nIndex*fIntervalHeight,x1,y1);
45     }
46     int nActPaintWidth = ui->widget_rxtx->width()-INTERVAL_HCOORD_LEFT-INTERVAL_WIDGET_RIGHT;
47     //每隔的间隔高度--横向:注意使用(float)nActPaintWidth)作为分子，即浮点数
48     float fIntervalWidth = ((float)nActPaintWidth)/(m_nHSingleLinePointCount-1);
49     for(int nIndex=0;nIndex<m_nHSingleLinePointCount;++nIndex)
50     {
51         QPen objPen = painter.pen();
52         if(0==nIndex || (m_nHSingleLinePointCount-1)==nIndex)
53         {
54            objPen.setStyle(Qt::SolidLine);
55         }
56         else
57         {
58             objPen.setStyle(Qt::DashLine);
59         }
60         painter.setPen(objPen);
61         int nXPoint = INTERVAL_HCOORD_LEFT+nIndex*fIntervalWidth;
62         painter.drawLine(nXPoint,INTERVAL_WIDGET_TOP,nXPoint,ui->widget_rxtx->height()-INTERVAL_WIDGET_BOTTOM);
63     }
64     painter.restore();
65 }