Can someone explain to me why the QwtRasterData::value method (which returns the value at the specified raster position) has "doubles" as the x / y for the position. I think I understand that the position is the pixel position, but what is a fraction of a position? I am trying to map the value call to my data but I am not sure what the fractional positions are.

For example, I am creating a 100 x 100 QwtRasterData. I want to have a 100x100 array with values in it. How do I map the "value" call to my array?

By the way, I am using the Spectrogram example as a starting point.

Thanks.