Hello everyone,

This is my first post on the forums. I've lurked on a few threads trying to understand how the Qwt spectrogram example can take data, but I can't get my head around QwtRasterData.

Qt Code: 
  1. class SpectrogramData: public QwtRasterData
  2. {
  3. public:
  4.     SpectrogramData():
  5.         QwtRasterData(QwtDoubleRect(-1.5, -1.5, 3.0, 3.0))
  6.     {
  7.     }
  8.  
  9.     virtual QwtRasterData *copy() const
  10.     {
  11.         return new SpectrogramData();
  12.     }
  13.  
  14.     virtual QwtDoubleInterval range() const
  15.     {
  16. 	return QwtDoubleInterval(0.0, 10);
  17.     }
  18.  
  19.     virtual double value(double x, double y) const
  20.     {
  21.         const double c = 0.842;
  22.  
  23.         const double v1 = x * x + (y-c) * (y+c);
  24.         const double v2 = x * (y+c) + x * (y+c);
  25.  
  26.         return 1.0 / (v1 * v1 + v2 * v2);
  27.     }
  28. };
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My data is an 11x11 array (double data[11][11];). Each entry is depicting a 1x1cm^2 area from a detector. How could I modify the spectrogram example to display my data?

Secondary: Would there be a way to disable interpolation?

Thank you.


Mr_Cloud