在Qt中添加一张幻灯片，使信号在y轴上上下移动

Question

我在同一张图上有三个实时信号，但有时它们会重叠，我需要一个滑动按钮在 y 轴上上下移动它们才能更好地看到它们。如何将幻灯片连接到图形？就像当幻灯片的值发生变化时，信号的数据会以 real_y_values+slide_value 添加到图表上？这是主窗口.cpp：

MainWindow::MainWindow(QSerialPort* s,QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow),
reader(s)
{
  ui->setupUi(this);
  connect(ui->verticalSlider,SIGNAL(valueChanged(int)),ui->customPlot,SLOT(deplasare()));
  setGeometry(400, 250, 542, 390);
  grafic(ui->customPlot);
  setWindowTitle("Real Time Data Graph for EDA ");
  statusBar()->clearMessage();
  ui->customPlot->replot();
}
void MainWindow::grafic(QCustomPlot *customPlot)
{
 Graph_Name = "Real Time Data Graph for EDA";
 customPlot->addGraph(); // blue line
 customPlot->graph(0)->setPen(QPen(Qt::blue));
 customPlot->addGraph();
 customPlot->graph(1)->setPen(QPen(Qt::blue));
 customPlot->addGraph(); // red line
 customPlot->graph(2)->setPen(QPen(Qt::red));
 customPlot->addGraph();
 customPlot->graph(3)->setPen(QPen(Qt::red));
 customPlot->addGraph(); // green line
 customPlot->graph(4)->setPen(QPen(Qt::green));
 customPlot->axisRect()->setupFullAxesBox();
 connect(&dataTimer, SIGNAL(timeout()), this, SLOT(realtimeDataSlot()));
 dataTimer.start(100); // Interval 0 means to refresh as fast as possible
 }
 void MainWindow::realtimeDataSlot()
 {
 timeCounter+=10;
QByteArray data1;
data1=reader._read_callback();
int sz = data1.size();
int value0;
int value2=800;
int ssz=0;
for(int ii=0;ii<sz;ii++)
   if((int)data1[ii] != 13 && (int)data1[ii] != 10)
    {
        value0=(int)data1[ii];
        ssz++;
        //fct add graph
         ui->customPlot->graph(0)->addData(timeCounter, value0);
         buf.push(value0);
         ui->customPlot->graph(2)->addData(timeCounter, buf.get_SCL());
         cout<<value0<<"   "<<buf.get_SCL()<<endl;
     }


if(timeCounter>=800)
 {
      timeCounter = 0;
      ui->customPlot->graph(1)->clearData();
      ui->customPlot->graph(1)->addData(*(ui->customPlot->graph(0)->data()));
      ui->customPlot->graph(0)->clearData();
      ui->customPlot->graph(3)->clearData();
      ui->customPlot->graph(3)->addData(*(ui->customPlot->graph(2)->data()));
      ui->customPlot->graph(2)->clearData();
 }
 else {

    ui->customPlot->graph(4)->addData(timeCounter, value2);
    ui->customPlot->xAxis->setRange(0,800);
    ui->customPlot->yAxis->setRange(-300, 1024);
  }
    ui->customPlot->graph(1)->removeData(timeCounter, timeCounter+50);
    ui->customPlot->graph(3)->removeData(timeCounter, timeCounter+50);
    ui->customPlot->replot();
}
    void MainWindow::deplasare()
     {
       }
    MainWindow::~MainWindow(){
      delete ui;
     }

我在 MainWindow 中做了一个插槽：void MainWindow::deplasare()为了将幻灯片与信号连接起来，但我无法弄清楚这个功能的内容。

Answer 1

首先，看看这个，以便了解如何使用QSlider。
从那里你应该明白你需要改变你的connect是：

connect(ui->verticalSlider,SIGNAL(valueChanged(int)),this,SLOT(deplasare(int)));

现在，如果您想对其中一个图形进行某种偏移，则必须将此偏移添加到所有数据点并重新绘制。这是在您的ui->customPlot->graph(0)上执行此操作的示例：

void MainWindow::deplasare(int offset){
    QCPDataMap *dataMap = ui->customPlot->graph(0)->data();
    for (QMap<double,QCPData>::iterator it = dataMap->begin(); it != dataMap->end(); ++it){
        it.value().value += offset;
    }
    ui->customPlot->replot();
}

我们对上面看到的一些解释：
由于QCPGraph数据保存在QCPDataMap这实际上是一个QMap<double,QCPData>。为了向图中的每个数据点添加offset，我们迭代QMap并向每个QCPData::value添加offset。