#include<iostream>
#include<math.h>
#include<fstream>
using namespace std;

#include "Pixel.h"
//static members initializations
const double Pixel::fgk_DetSizeX=5; // expressed in cm 
const double Pixel::fgk_DetSizeY=5; // expressed in cm 
const double Pixel::fgk_PixelSizeX=0.05; // expressed in cm
const double Pixel::fgk_PixelSizeY=0.05; // expressed in cm
ifstream Pixel::f_calibFile;

Pixel::Pixel():f_index(-1),f_x(0),f_y(0),f_dx(0),f_dy(0){
f_Par.ax=0.;
f_Par.bx=0.;
f_Par.ay=0.;
f_Par.by=0.;
}

Pixel::Pixel(int index){
//parametric constructor
Set(index);
}

void Pixel::Set(int index){
//Global Setter
CalibratePixel(index);
f_index=index;
f_x=f_Par.ax*(-fgk_DetSizeX/2+(index%100+0.5)*fgk_PixelSizeX)+f_Par.bx;
f_y=f_Par.ay*( fgk_DetSizeY/2-(index/100+0.5)*fgk_PixelSizeY)+f_Par.by;
f_dx=fgk_PixelSizeX/sqrt(12);
f_dy=fgk_PixelSizeY/sqrt(12);
}

void Pixel::OpenCalibFile(){
//static method to open calibration file
f_calibFile.open("calibPos.dat");
}

void Pixel::CalibratePixel(int index) const{
//method to fetch calibration parameters for a given channel
f_calibFile.seekg((index)*sizeof(f_Par));
f_calibFile.read((char*)&f_Par,sizeof(f_Par));
}

void Pixel::CloseCalibFile(){
//static method to close calibration file
f_calibFile.close();
}