Time in a xBotton scale

[qtprgrmr]

Hello, this is my first post in the forum, and I decided write here because I cant put the hours like scale.

I have to do temperature plot, I read two types of variables, the time and the temperature.
I can draw the plot, but using those information:
xVal yVal
1 26º
2 12º
3 16º
4 22º

untitled.jpg

but I need view the plot like this
hrs yVal
10:00 26º
10:05 12º
10:10 16º
10:15 22º
All the information that I need I have in these arrays
QwtArray<double> xVal;
QwtArray<double> yVal;
QList <QString> tmr

untitled1.jpg

I need the information like a picture but I cant put labels or something in xBotton
anyone can help me?

[qtprgrmr]

I resolved the problem.
I based in a cpuplot example
I have introduced a variant of TimeScaleDraw class. This class, in this example, calculates the time that passed.
However, in my application this class returns the QStirng that is in this position.

[qtprgrmr]

this the class that I change.

class TimeScaleDraw: public QwtScaleDraw
{
public:
	TimeScaleDraw(QList<QString> *a)
    {
		t=a;
    }
    virtual QwtText label(double v) const
    {
    	while(v>=t->count())v-=t->count();
    	return t->at(v);
    }
private:
    QList<QString> *t;
};

class TimeScaleDraw: public QwtScaleDraw
{
public:
	TimeScaleDraw(QList<QString> *a)
    {
		t=a;
    }
    virtual QwtText label(double v) const
    {
    	while(v>=t->count())v-=t->count();
    	return t->at(v);
    }
private:
    QList<QString> *t;
};

To copy to clipboard, switch view to plain text mode 

And now I need zoom the plot but only in X axis. I see that in the real-time example used the scrollbar that I need but in both axis. This example is quite complicate and I don't understand all that it do. I like to use one scrollbar , but only in x axis and not move Y scale.
I have copy the classes that are used to zoom and I create an object to perform the zoom but, how I could disable zoom in the y-axis?

Could anyone help me? thank you very much