Hello,

I wonder whether it is possible to get the actual min and max range values of spectrogram and not to set them manually, like I do it now (see the code below). I mean, after the data for spectrogram was calculated, then the max and min values should be known, right? How to get them then? I don't want to set the range manually, but it should be done according to the current data. Help me please.

best regards,


Qt Code: 
  1. typedef double (*benchFunc)(vector<double>);	// definition of function pointer for benchmark function
  2.  
  3. // this class creates the data of objective function
  4.  
  5. class SpectrogramData: public QwtRasterData
  6. {
  7. public:
  8.     SpectrogramData(benchFunc b, double rang1[2],  double rang2[2], int dims[2], vector<double> fix_vec , unsigned dimens, QwtDoubleInterval interval ):
  9.         QwtRasterData(QwtDoubleRect(rang1[0], rang2[0], rang1[1]- rang1[0], rang2[1]- rang2[0]))
  10.     {
  11.     	MybenchFunc = b;
  12.     	valuesRange = interval;                                 //<<<<<<<<<< here it is set manually
  13.     	dim_ind[0] = dims[0];  dim_ind[1] = dims[1];
  14.     	dimensions = dimens;
  15.     	fix_vals = fix_vec;
  16.     }
  17.  
  18.     virtual QwtRasterData *copy() const
  19.     {
  20.         return new SpectrogramData(*this);
  21.     }
  22.  
  23.     virtual QwtDoubleInterval range() const          //<<<<<<<<<<< here the range will be returned
  24.     {
  25.         return valuesRange;
  26.     }
  27.  
  28.     virtual double value(double x, double y) const
  29.     {
  30.     	vector<double> coords;
  31.     	coords = vector<double>(dimensions, 0);		// create a vector of size "dimensions" containing zeros
  32.     	if(dimensions > 2){		// if the benchmark function has more dimensions than 2, then...
  33.     		for(unsigned i=0 ; i < dimensions ; ++i){
  34.     			coords[i] = fix_vals[i];	// ... copy first all fixed values into vector and then...
  35.     		}
  36.     		coords[dim_ind[0]] = x;		// replace the values of dimensions to be visualized
  37.     		coords[dim_ind[1]] = y;
  38.     	}
  39.     	else{
  40. 			coords[dim_ind[0]] = x;
  41. 			coords[dim_ind[1]] = y;
  42.     	}
  43.     	const double result = MybenchFunc( coords);
  44.         return result;
  45.     }
  46.  
  47. private:
  48.  
  49. 	benchFunc MybenchFunc;	// function pointer for benchmark function
  50. 	QwtDoubleInterval valuesRange;
  51. 	int dim_ind[2];
  52. 	unsigned dimensions;
  53. 	vector<double> fix_vals;
  54. };
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