/*
 This class plots image's histograms in a plotter
*/

 //---------------------
 // Includes
 //----------------------
 #include "Histogram.h"
 #include  "vtkImageCast.h"
 #include  <math.h>
// ----------------------------------------------------------------------------
// WX headers inclusion.
// For compilers that support precompilation, includes <wx/wx.h>.
// ----------------------------------------------------------------------------

	#ifndef WX_PRECOMP
	#include <wx/wx.h>
	#endif

//----------------------------------------------------------------------------
// Class implementation
//----------------------------------------------------------------------------

IMPLEMENT_CLASS(Histogram, wxWindow)
//----------------------------------------------------------------------------
// Event Table
//----------------------------------------------------------------------------

BEGIN_EVENT_TABLE(Histogram, wxWindow)
	EVT_SIZE  (Histogram::OnSize)
END_EVENT_TABLE()
 //---------------------
 // Constructor
 //----------------------

	Histogram::Histogram( wxWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size, int flag,vtkImageData* imageData):
	wxPanel(parent,id,pos,size,flag)
	{
		 SetBackgroundColour(wxColour(255,255,255));
		//histogram
		histogram= new pHistogram(imageData);
		
		//plotter
		plotter=new pPlotterWindow(this, -1, wxPoint(0,0), wxSize(742,476), wxSUNKEN_BORDER );
		
		plotter->AddLayer(new pPlotterScaleX());
		plotter->AddLayer(new pPlotterScaleY());
		//is a plotter of histograms
		plotter->setType(2);
		//setting the popMenu
		plotter->setPopUpMenu(true,true,true,true,true,true,false,false,false,false,false,false,false);
		histogramSize=0;
		
		idHistogram=-1;
		
		//drawing
		drawHistogram();
		
		
	}

	Histogram::~Histogram()
	{
		delete histogram;
		delete plotter;

	}
	/*
	Draw the histogram in the plotter
	*/
	void Histogram::drawHistogram()
	{
		//int xValues[MAX],yValues[MAX],extent[6];
		double* xValues;
		double* yValues;
		
		vtkImageData* histogramImageData=histogram->getHistogram();
		
		//size
		histogramSize=histogram->getSize();

		//plotting
		xValues=(double*)malloc(NUM_POINTS*sizeof(double));
		yValues=(double*)malloc(NUM_POINTS*sizeof(double));
		
		unsigned short* histogramPointer=(unsigned short*)histogramImageData->GetScalarPointer(0,0,0);
		
		for(int i=0; i< histogramSize; i++)
		{
			xValues[i]=i;
			yValues[i]=log( (double) histogramPointer[i])*10;
		}

		
		pGraphicalFunction* histogramFunction=plotter->getFunctionForVectors(xValues,histogramSize,yValues,histogramSize);
		
		if (histogramFunction)
		{
			histogramFunction->setEditable(false);
			//smooth function
			histogramFunction->setType(2);
			//it is an histogram
			histogramFunction->setmType(2);
			idHistogram=plotter->addFunction(histogramFunction);
			//for setting range the vision
			plotter->addFunctionToMove(histogramFunction);
			wxPen mypen1(*wxBLUE, 1, wxSOLID );
			mypen1.SetWidth(2);
			histogramFunction->SetPen( mypen1 );
		}
		
		
			free(xValues);
			free(yValues);
		
		//plotter->setPopUpMenu(true,true,false,false,true,true,false,false,false,false,false,false,false);
	}
	
	/*
		if the user resize the window	
	*/
	void Histogram::OnSize(wxSizeEvent &WXUNUSED(event))
	{
		int scrX,scrY;
		GetClientSize(&scrX,&scrY);
		plotter->SetSize(scrX,scrY);
		/*
		pGraphicalFunction* actual=plotter->getFunction(idTransferenceFunction);
		actual->setScreens(scrX,scrY);
		actual->setScales();
		*/
	}
	
	/*
		get a point of the Histogram
		given the grey value
	*/
	int Histogram::getHistogramPoint(int gValue)
	{
		return histogram->getHistogramPoint(gValue);
	}
	

	//-------------------
	// Getter and setters
	//-------------------

	int Histogram::getHistogramSize()
	{
		return histogramSize;
	}