Hello,

I try to display markers above a spectrogram. The spectrogram data is visualized correctly, but I cannot see any markers on it. The code I use for visualization is below. Could you tell me, where the mistake is or why the markers are not visible on the plot? Thank you.

best regards

Qt Code: 
  1. // this function draws the spectrogram of benchmark function and the constraint curves
  2. void Plot::drawNewData(){
  3.  
  4. 	this->detachItems();
  5.  
  6.     d_spectrogram = new QwtPlotSpectrogram();
  7.  
  8. 	// load the corresponding struct with optimization problem
  9.     //
  10. 		optProbList = _mf->getOptProblems();
  11. 		unsigned index=	_mf->objFunction;
  12. 		double (*f)(vector<double> coord) = optProbList[index]->benchmark;
  13. 		double rangex1[2] = {optProbList[index]->min[_mf->dim_indices[0]], optProbList[index]->max[_mf->dim_indices[0]]};
  14. 		double rangex2[2] = {optProbList[index]->min[_mf->dim_indices[1]], optProbList[index]->max[_mf->dim_indices[1]]};
  15. 		QwtDoubleInterval value_interval = optProbList[index]->valuesRange;
  16.  
  17. 		// here the data for ploting is set from the function "SpectrogramData()", in which the data is generated
  18. 		//
  19. 		d_spectrogram->setData(SpectrogramData((*f), rangex1, rangex2,   _mf->dim_indices , _mf->fixed_values, optProbList[index]->dimensions, value_interval));
  20. 		d_spectrogram->attach(this);		// attach the data to the plot widget
  21.  
  22. 		// set the colors for intensity values
  23. 		//
  24. 		 QwtLinearColorMap colorMap(Qt::darkCyan, Qt::red);
  25. 		 colorMap.addColorStop(0.25, Qt::cyan);
  26. 		 colorMap.addColorStop(0.5, Qt::green);
  27. 		 colorMap.addColorStop(0.75, Qt::yellow);
  28. 		 d_spectrogram->setColorMap(colorMap);
  29.  
  30. 		 // A color bar on the right axis
  31. 		 //
  32. 		 QwtScaleWidget *rightAxis = axisWidget(QwtPlot::yRight);
  33. 		 rightAxis->setTitle("Intensity");
  34. 		 rightAxis->setColorBarEnabled(true);
  35. 		 rightAxis->setColorMap(d_spectrogram->data().range(), d_spectrogram->colorMap());
  36.  
  37. 		 // set the scale of color bar
  38. 		 //
  39. 		 setAxisScale(QwtPlot::yRight,
  40. 			  d_spectrogram->data().range().minValue(),
  41. 			  d_spectrogram->data().range().maxValue() );
  42. 		  enableAxis(QwtPlot::yRight);
  43.  
  44. 	   // define the steps and number of contour lines
  45. 	   //
  46. 		  QwtValueList contourLevels;
  47. 					  double stepsize;
  48. 					  if(value_interval.width()<2){
  49. 						  stepsize = 0.2;
  50. 					  }
  51. 					  if(value_interval.width()>=5 && value_interval.width() < 20){
  52. 						  stepsize = 1;
  53. 					  }
  54. 					  if(value_interval.width()>=20 && value_interval.width() < 50){
  55. 						  stepsize = 5;
  56. 					  }
  57. 					  if (value_interval.width() >= 50 && value_interval.width() < 1000){
  58. 						  stepsize = 50;
  59. 					  }
  60. 					  if ( value_interval.width() >= 1000){
  61. 						  stepsize = 10000;
  62. 					  }
  63. 		  for ( double level = value_interval.minValue(); level < value_interval.maxValue(); level += stepsize )
  64. 			  contourLevels += level;
  65. 		  d_spectrogram->setContourLevels(contourLevels);
  66.  
  67. 		  plotLayout()->setAlignCanvasToScales(true);
  68.  
  69. 	//+++++++++++++++++ plot constraints curves if the option "use constraints" is selected ++++++++++++++++++++++
  70.  
  71. 	if(_mf->useConstraints){		// if the user has checked the radio button "use constraints" in initialization...
  72.  
  73. 		QVector<int> equality = optProbList[index]->constraint_equality;
  74.  
  75. 		if(_mf->allConstraints){	// if use all constraints
  76. 			int k=0;
  77. 		for( std::map<QString, double (*)( vector<double>  )>::iterator ii = optProbList[index]->constraints.begin(); ii!= optProbList[index]->constraints.end(); ++ii)
  78. 			   {
  79.  
  80. 			double step_size = 0.5 ;
  81. 				for(double x1= optProbList[index]->min[_mf->dim_indices[0]] ; x1 < optProbList[index]->max[_mf->dim_indices[0]] ; x1=x1+ step_size){
  82. 					for(double x2= optProbList[index]->min[_mf->dim_indices[1]] ; x2 < optProbList[index]->max[_mf->dim_indices[1]] ; x2=x2+ step_size){
  83. 						vector<double> coords(3,0);
  84. 						coords = _mf->fixed_values;
  85. 						coords[_mf->dim_indices[0]] = x1;
  86. 						coords[_mf->dim_indices[1]] = x2;
  87. 						double result = (*ii).second(coords);	// compute the y value
  88. 						if(result==1){
  89. 							// create PlotMarkers to visualize the infeasible area
  91. 								QwtSymbol *symb = new QwtSymbol();
  92. 								symb->setBrush(QBrush(Qt::red, Qt::SolidPattern));
  93. 								symb->setStyle(QwtSymbol::Ellipse);
  94. 								symb->setSize(5,5);
  95. 								mark->setSymbol(*symb);
  96. 								mark->setXValue(x1);						// set the position of marker on the plot
  97. 								mark->setYValue(x2);
  98. 								//mark->setZ(101);
  99. 								mark->attach(this);
  100. 						}
  101. 					}
  102. 				}
  103.  
  104. 			k= k+1;
  105. 			   }
  106. 		}
  107. 		else{				// if use certain constraint
  108. 			unsigned t = 0;
  109. 			for( std::map<QString, double(*)( vector<double> )>::iterator ii = optProbList[index]->constraints.begin(); ii!= optProbList[index]->constraints.end(); ++ii)
  110. 				{
  111. 				if(t== _mf->constraint){
  112.  
  113. 					double step_size = 0.5 ;
  114. 					for(double x1= optProbList[index]->min[_mf->dim_indices[0]] ; x1 < optProbList[index]->max[_mf->dim_indices[0]] ; x1=x1+ step_size){
  115. 						for(double x2= optProbList[index]->min[_mf->dim_indices[1]] ; x2 < optProbList[index]->max[_mf->dim_indices[1]] ; x2=x2+ step_size){
  116. 							vector<double> coords(3,0);
  117. 							coords = _mf->fixed_values;
  118. 							coords[_mf->dim_indices[0]] = x1;
  119. 							coords[_mf->dim_indices[1]] = x2;
  120. 							double result = (*ii).second(coords);	// compute the y value
  121. 							if(result==1){
  122. 								// create PlotMarkers to visualize the infeasible area
  124. 									QwtSymbol *symb = new QwtSymbol();
  125. 									symb->setBrush(QBrush(Qt::red, Qt::SolidPattern));
  126. 									symb->setStyle(QwtSymbol::Ellipse);
  127. 									symb->setSize(5,5);
  128. 									mark->setSymbol(*symb);
  129. 									mark->setXValue(x1);						// set the position of marker on the plot
  130. 									mark->setYValue(x2);
  131. 									//mark->setZ(101);
  132. 									mark->attach(this);
  133. 							}
  134. 						}
  135. 					}
  136. 				}
  137. 				t= t+1;
  138. 				}
  139. 		}
  140. 	}
  141. 	//+++++++++++++++++ end of plot constraints curves if the option "use constraints" is selected ++++++++++++++++++++++
  142.     replot();
  143. }
To copy to clipboard, switch view to plain text mode