Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/digits_hits/utils/src/G4DefaultLinearColorMap.cc

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
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 25 //
 26 //
 27 //
 28 
 29 #include "G4DefaultLinearColorMap.hh"
 30 
 31 void G4DefaultLinearColorMap::GetMapColor(G4double val, G4double color[4])
 32 {
 33   G4double value;
 34   if(fMaxVal == fMinVal)
 35     value = 0.;
 36   else
 37     value = (val - fMinVal) / (fMaxVal - fMinVal);
 38 
 39   if(value > 1.)
 40   {
 41     value = 1.;
 42   }
 43   if(value < 0.)
 44   {
 45     value = 0.;
 46   }
 47 
 48   // color map
 49   const int NCOLOR = 6;
 50   struct ColorMap
 51   {
 52     G4double val;
 53     G4double rgb[4];
 54   } colormap[NCOLOR] = { { 0.0, { 1., 1., 1., 1. } },  // value, r, g, b, alpha
 55                          { 0.2, { 0., 0., 1., 1. } },
 56                          { 0.4, { 0., 1., 1., 1. } },
 57                          { 0.6, { 0., 1., 0., 1. } },
 58                          { 0.8, { 1., 1., 0., 1. } },
 59                          { 1.0, { 1., 0., 0., 1. } } };
 60 
 61   // search
 62   G4int during[2] = { 0, 0 };
 63   for(int i = 1; i < NCOLOR; i++)
 64   {
 65     if(colormap[i].val >= value)
 66     {
 67       during[0] = i - 1;
 68       during[1] = i;
 69       break;
 70     }
 71   }
 72 
 73   // interpolate
 74   G4double a = std::fabs(value - colormap[during[0]].val);
 75   G4double b = std::fabs(value - colormap[during[1]].val);
 76   for(int i = 0; i < 4; i++)
 77   {
 78     color[i] =
 79       (b * colormap[during[0]].rgb[i] + a * colormap[during[1]].rgb[i]) /
 80       (colormap[during[1]].val - colormap[during[0]].val);
 81     if(color[i] > 1.)
 82       color[i] = 1.;
 83   }
 84 }
 85