Qt开发笔记之QCustomPlot：QCustomPlot介绍、编译与使用

//下标的格式：数字或者时钟
   ui->customPlot->xAxis->setTickLabelType(QCPAxis::ltNumber);
   //设置时钟下标格式
//   ui->customPlot->xAxis->setDateTimeFormat("hh:mm:ss");
   ui->customPlot->xAxis->setRange(0,8);
   //是否允许自动下标
   ui->customPlot->xAxis->setAutoTickStep(false);
   //手动设置下标，要先禁止自动下标，隔多少间距显示下标
   ui->customPlot->xAxis->setTickStep(1);
   //设置steps之间的间隔杠
   ui->customPlot->xAxis->setAutoSubTicks(false);
   ui->customPlot->xAxis->setSubTickCount(9);//9+1
//   ui->customPlot->axisRect()->setupFullAxesBox();
   //设置横轴标签
   ui->customPlot->xAxis->setLabel("时间(单位s)");
   //设置纵轴范围
   ui->customPlot->yAxis->setRange(-1,1);
   //设置纵轴标签仅使用1个字会报换行符错误后面加个空格
   ui->customPlot->yAxis->setLabel("大小");
   ui->customPlot->yAxis->setAutoTickStep(false);
   ui->customPlot->yAxis->setTickStep(0.2);
   ui->customPlot->yAxis->setAutoSubTicks(false);
   ui->customPlot->yAxis->setSubTickCount(1);//1+1

voidMainWindow::realtimeDataSlot()
{
//每次刷新点的坐标，并且刷新qt图标的界面
double key = (double)(_elapsedTimer.elapsed() + _begin) / 1000;
//10ms更新一个点
if(key - _lastPointKey > 0.01)
{
//sin(key*1.6+cos(key*1.7)*2)*10+sin(key*1.2+0.56)*20+26;
double value0 = qSin(key);
//sin(key*1.3+cos(key*1.2)*1.2)*7+sin(key*0.9+0.26)*24+26;
double value1 = qCos(key);       
if(_start && !_pause)
{
if(ui->customPlot->graph(0)->visible()&&ui->customPlot->graph(1)->visible())
ui->customPlot->graph(0)->setBrush(QBrush(Qt::yellow));
else
ui->customPlot->graph(0)->setBrush(QBrush(Qt::transparent));
//画线
ui->customPlot->graph(0)->addData(key,value0);
ui->customPlot->graph(1)->addData(key,value1);
//画点
ui->customPlot->graph(2)->clearData();
ui->customPlot->graph(2)->addData(key,value0);
//蓝色图层是否可见
if(ui->customPlot->graph(0)->visible())
{
//统一是x的格式，末尾为0也显示
QString zzz=QString("%1").arg(key);
for(int index = zzz.size() - zzz.lastIndexOf("."); index < 4; index++)
{
zzz += "0";
}
ui->label_maleX->setText(QString("%1").arg(zzz));
//在msvc2010编译上会出现错误：9个QString::arg匹配和 mid右侧不是联合
//             QString strValue0=QString("%1").arg(value0,4,10,QChar('0')).mid(0,6);
QString strValue0=QString("%1").arg(value0).mid(0,6);
strValue0 = 
strValue0.startsWith("-")? strValue0.mid(0,6):strValue0.mid(0,5);
ui->label_maleY->setText(strValue0);
}else
{
ui->label_maleX->setText("");
ui->label_maleY->setText("");
}
ui->customPlot->graph(3)->clearData();
ui->customPlot->graph(3)->addData(key,value1);
//红色图层是否可见
if(ui->customPlot->graph(1)->visible())
{
//统一是x的格式，末尾为0也显示
QString zzz = QString("%1").arg(key);
for(int index = zzz.size() - zzz.lastIndexOf("."); index < 4; index++)
{
zzz += "0";
}
ui->label_femaleX->setText(QString("%1").arg(zzz));
//在msvc2010编译上会出现错误：9个QString::arg匹配和 mid右侧不是联合
//               QString strValue1 = QString("%1").arg(value1,4,10,'0').mid(0,6);
QString strValue1 = QString("%1").arg(value1).mid(0,6);
strValue1 = strValue1.startsWith("-") ?strValue1.mid(0,6):strValue1.mid(0,5);
ui->label_femaleY->setText(strValue1);
}else
{
ui->label_femaleX->setText("");
ui->label_femaleY->setText("");
}
//移除图标已逝去的点，避免其占用内存
ui->customPlot->graph(0)->removeDataBefore(key-8);
ui->customPlot->graph(1)->removeDataBefore(key-8);
//rescalevalue(vertical)axistofitthecurrentdata:
//根据该图像最高点和最低点，缩放Y周
//           ui->customPlot->graph(0)->rescaleValueAxis();
//根据该图像最高点和最低点，缩放Y周以最后一个为主，所以这里只加入边界，true
//           ui->customPlot->graph(1)->rescaleValueAxis(true);
_lastPointKey=key;
}
}
//当显示的X轴超过8的时候，X坐标范围开始移动
if(key > 8.0)
{
ui->customPlot->xAxis->setRange(key+0.01,8,Qt::AlignRight);
}
ui->customPlot->replot();
//计算每秒的帧数
static double lastFpsKey;
static int frameCount;
++frameCount;
//取2秒的平衡均值
if(key-lastFpsKey > 2)
{
//设置状态栏显示FPS
ui->statusBar->showMessage(
QString("%1FPS")
.arg(frameCount/(key-lastFpsKey), 0, 'f', 0));
lastFpsKey = key;
frameCount = 0;
}
}