QwtPlotHistogram

[yers]

I am currently working on a qt plotting program and was in the process of creating a histogram plot class from scratch when I came upon people mentioning the existence of a QwtPlotHistogram class. I have researched this and I cannot seem to find any documentation on how to implement it. Any help or a quick example would be greatly appreciated.

[Uwe]

Download Qwt 6.x and check the tvplot example.

Uwe

[mohini]

hey,
Any one knows how to set some text on each histogram bar ?
I have used QwtPlotHistogram to plot my histogram.
I want diffetent labels on each bars of histogram

[Uwe]

Overload QwtPlotHistogram ::drawColumn(),

Uwe

[penny]

Could you please elaborate a little more on exactly what 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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but no text appeared..