how connection variable in functin with spinBox

[Sergey19]

Good afternoon !
I am beginner in qt.I have a problem .How connection variable i in function with my spinBox.
This my function :

void DataPlot::insertCurve(Qt::Orientation o,
const QColor &c, double base)
{
QwtPlotCurve *curve = new QwtPlotCurve();
curve->setPen(QPen(Qt::blue,3));
 
 
double i ;
double x[10];
double y[sizeof(x) / sizeof(x[0])];
 
for ( uint k = 0; k < sizeof(x) / sizeof(x[0]); k++ )
{
double v = i+k * 1.5;
if ( o == Qt::Horizontal )
{
x[k] = v;
y[k] = base;
}
else
{
x[k] = base;
y[k] = v;
}
}
 
curve->setData(x, y, sizeof(x) / sizeof(x[0]));
curve->attach(this);
}

void DataPlot::insertCurve(Qt::Orientation o,
const QColor &c, double base)
{
QwtPlotCurve *curve = new QwtPlotCurve();
curve->setPen(QPen(Qt::blue,3));


double i ;
double x[10];
double y[sizeof(x) / sizeof(x[0])];

for ( uint k = 0; k < sizeof(x) / sizeof(x[0]); k++ )
{
double v = i+k * 1.5;
if ( o == Qt::Horizontal )
{
x[k] = v;
y[k] = base;
}
else
{
x[k] = base;
y[k] = v;
}
}

curve->setData(x, y, sizeof(x) / sizeof(x[0]));
curve->attach(this);
}

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