qudro2

double map(double inputValue, double old_min, double old_max, double new_min, double new_max)
{
    double old_range = old_max - old_min;
    double new_range = new_max - new_min;
    double returnValue = (((inputValue - old_min) * new_range) / old_range) + new_min;

    return returnValue;
}


void paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.save();

    painter.setFont(fontTagsValue);

    widthOneSegment = widthLevelSignalColumn + distanceBeetwenLevelSignalColumn;

    quantityLevelSignalColumns = this->width()/widthOneSegment;

    double offsetX = quantityLevelSignalColumns/2;

    double startPointX = selectValue - offsetX * scaleX;

    double endPointX = selectValue + offsetX * scaleX;

    qDebug() << quantityLevelSignalColumns;

    qDebug() << offsetX;

    qDebug() << startPointX;

    qDebug() << endPointX;

    double startSegment = map(floor(startPointX), startPointX, endPointX, 0, quantityLevelSignalColumns);

    double endSegment = map(ceil(endPointX), startPointX, endPointX, 0, quantityLevelSignalColumns);

    qDebug() << startSegment;

    qDebug() << endSegment;

    painter.setBrush(QBrush(QColor(255, 0, 0), Qt::SolidPattern));
    painter.setPen(Qt::NoPen);

    double value1 = round(offsetX*10)/10;

    painter.drawRect((value1 * widthOneSegment), 150, widthLevelSignalColumn, 30);

    painter.setBrush(QBrush(QColor(175,175,175), Qt::SolidPattern));

    for(double i = startSegment; i <= endSegment; i++)
    {
        double value = round(i*10)/10;

        qDebug() << "value: " << value;
        qDebug() << "value * widthOneSegment:" << (value * widthOneSegment);

        painter.drawRect(value * widthOneSegment, 150 - inputValue[startPointX + i], widthLevelSignalColumn, inputValue[startPointX + i]);
    }
}