Src/DasherCore/EyetrackerFilter.cpp

   1 #include "EyetrackerFilter.h"
   2
   3 CEyetrackerFilter::CEyetrackerFilter(Dasher::CEventHandler * pEventHandler, CSettingsStore *pSettingsStore, CDasherInterfaceBase *pInterface, CDasherModel *m_pDasherModel)
   4   : CDefaultFilter(pEventHandler, pSettingsStore, pInterface, m_pDasherModel, 5, "Eyetracker Mode") {
   5 }
   6
   7 void CEyetrackerFilter::ApplyTransform(myint &iDasherX, myint &iDasherY) {
   8   double disty=(myint)GetLongParameter(LP_OY)-iDasherY;
   9
  10   myint x( iDasherX );
  11
  12   myint dasherOX=(myint)GetLongParameter(LP_OX);
  13
  14   //  if( iDasherX < dasherOX ) {
  15
  16   //cout << "dasherOX: " << dasherOX << endl;
  17   myint dasherOY=(myint)GetLongParameter(LP_OY);
  18
  19   // X co-ordinate changes.
  20   double double_x = (x/dasherOX);  // Fraction of way over to crosshair
  21   double double_y = -((iDasherY-dasherOY)/(double)(dasherOY) ); // Fraction above the crosshair
  22
  23   // FIXME - I have *no* idea how this is supposed to work - someone else fix it and comment the code please!
  24
  25   double xmax_y = xmax(double_x, double_y);
  26
  27   if(double_x < xmax_y) {
  28     double_x = xmax_y;
  29   }
  30
  31   //      std::cout << xmax_y << std::endl;
  32
  33   x = myint(dasherOX*double_x);
  34
  35   // Finished x-coord changes.
  36
  37   double repulsionparameter=0.5;
  38   iDasherY = myint(dasherOY - (1.0+ double_y*double_y* repulsionparameter ) * disty);
  39
  40   if( iDasherX < x )
  41     iDasherX = x;
  42 }
  43
  44 double CEyetrackerFilter::xmax(double x, double y) {
  45   // DJCM -- define a function xmax(y) thus:
  46   // xmax(y) = a*[exp(b*y*y)-1]
  47   // then:  if(x<xmax(y) [if the mouse is to the RIGHT of the line xmax(y)]
  48   // set x=xmax(y).  But set xmax=c if(xmax>c).
  49   // I would set a=1, b=1, c=16, to start with.
  50
  51   int a = 1, b = 1, c = 100;
  52   double xmax = a * (exp(b * y * y) - 1);
  53   //cout << "xmax = " << xmax << endl;
  54
  55   if(xmax > c)
  56     xmax = c;
  57
  58   return xmax;
  59 }