plot

//Функция рисования точек
void OscilloscopeWidget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    QPen pen;
    pen.setWidth(1);
    pen.setColor(QColor(0,0,255));
    painter.setPen(pen);
    painter.save();
    for(int i = 1; i < qVectorQPointF.size(); i++)
    {
        QPointF pointOne = qVectorQPointF[i-1];
        QPointF pointTwo = qVectorQPointF[i];
        pointOne.setX(pointOne.x()*scaleX + offSetX + moveValueX);
        pointOne.setY((pointOne.y()*scaleY) + offSetY + moveValueY);
        pointTwo.setX(pointTwo.x()*scaleX + offSetX + moveValueX);
        pointTwo.setY((pointTwo.y()*scaleY) + offSetY + moveValueY);

        painter.drawLine(pointOne, pointTwo);
    }
    painter.drawRect(this->rect());
    painter.restore();
}

//Функция обработки нажатия левой кнопки мыши
void OscilloscopeWidget::mousePressEvent(QMouseEvent *event)
{
    if(event->button() & Qt::LeftButton)
    {
        mousePressed = true;
        prevMousePos = event->pos();
        moveValueX = 0;
        moveValueY = 0;
    }
}

//Функция обработки отпускания левой кнопки мыши
void OscilloscopeWidget::mouseReleaseEvent(QMouseEvent *event)
{
    if(event->button() & Qt::LeftButton)
    {
        mousePressed = false;
        offSetX += moveValueX;
        offSetY += moveValueY;
        moveValueX = 0;
        moveValueY = 0;
    }
}

//Функция движения мыши с жатой левой кнопкой
void OscilloscopeWidget::mouseMoveEvent(QMouseEvent *event)
{
    if(mousePressed == true)
    {
        QPointF newPos = event->pos() - prevMousePos;
        moveValueX = newPos.x();
        moveValueY = newPos.y();
        update();
    }
}

//Функция кручения колесика
void OscilloscopeWidget::wheelEvent(QWheelEvent *event)
{
    float count = float(event->angleDelta().y()/120);

    scaleX += count/10;
    if(scaleX < 0)
    {
        scaleX = 0;
    }

    scaleY += count/1000;
    if(scaleY < 0)
    {
        scaleY = 0;
    }

    offSetX += event->position().x() - event->position().x()*scaleX;
    offSetY += event->position().y() - event->position().y()*scaleY;

    update();
}