Overloading drawColumn method of QwtPlotHistogram

[penny]

I want to set text on the rectangles of a QwtPlotHistogram. I read in a post that i need to overload drawColumn method of QwtPlotHistgram, but i cannot figure out what exactly is to be done..

I wrote

class Histogram: public QwtPlotHistogram
{
public:
    Histogram(const QString &, const QColor &);
    void setColor(const QColor &);
    void setValues(uint numValues, const double *);
    void drawColumn(QPainter *painter,const QwtColumnRect &rect,const QwtIntervalSample &samples);
};

class Histogram: public QwtPlotHistogram
{
public:
    Histogram(const QString &, const QColor &);
    void setColor(const QColor &);
    void setValues(uint numValues, const double *);
    void drawColumn(QPainter *painter,const QwtColumnRect &rect,const QwtIntervalSample &samples);
};

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and wrote this function

void Histogram::drawColumn(QPainter *painter,const QwtColumnRect &rect,const QwtIntervalSample &sample)
{
             drawColumn(painter,rect,samples);
	QString s="My Text";
	painter->drawText(50,100,s);
}

void Histogram::drawColumn(QPainter *painter,const QwtColumnRect &rect,const QwtIntervalSample &sample)
{
             drawColumn(painter,rect,samples);
	QString s="My Text";
	painter->drawText(50,100,s);
}

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I dont know what i'm missing out, because no text appeared at all with this

[AtillaBaspinar]

I think you need to call the super class function:

QwtPlotHistogram::drawColumn(painter,rect,samples) ;

I am dealing with same problem. What I need is to make the bars of the histogram in different colors. I also override drawColumn() function. It compiles but it does not paint bars to different colors.
My piece of code is like that:
void Histogram::drawColumn(QPainter *painter, const QwtColumnRect &rect, const QwtIntervalSample &samples) const
{
if (samples.value > 35)
{
painter->setPen(Qt::yellow);
painter->setBrush(QBrush((Qt::yellow)));
QwtPlotHistogram::drawColumn(painter,rect,samples) ;

}
else
{
painter->setPen(Qt::blue);
painter->setBrush(QBrush((QColor(60,100,20))));
QwtPlotHistogram::drawColumn(painter,rect,samples) ;
}
}