Read contents of QwtSeriesData<QPointF>

[cstr]

May be the problem was not clearly stated. I was not reading the values corresponding to the sinus curve inside coordinates. For some reason it seems that the data become available in coordinates only after a replot. May be some one can discuss what happens behind the scenes...

For me it was sufficient to do this:

double *xSin = new double[size];
double *ySin = new double[size];
for(int i = 0; i < size; i++){  /* Gera pontos do seno. */
    xSin[i] = i;
    ySin[i] = ::sin(i);
}

double *xSin = new double[size];
double *ySin = new double[size];
for(int i = 0; i < size; i++){  /* Gera pontos do seno. */
    xSin[i] = i;
    ySin[i] = ::sin(i);
}

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