G4DefaultLinearColorMap.cc

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#include "G4DefaultLinearColorMap.hh"
 
void G4DefaultLinearColorMap::GetMapColor(G4double val, G4double color[4])
{
  G4double value;
  if(fMaxVal == fMinVal)
    value = 0.;
  else
    value = (val - fMinVal) / (fMaxVal - fMinVal);
 
  if(value > 1.)
  {
    value = 1.;
  }
  if(value < 0.)
  {
    value = 0.;
  }
 
  // color map
  const int NCOLOR = 6;
  struct ColorMap
  {
    G4double val;
    G4double rgb[4];
  } colormap[NCOLOR] = { { 0.0, { 1., 1., 1., 1. } },  // value, r, g, b, alpha
                         { 0.2, { 0., 0., 1., 1. } },
                         { 0.4, { 0., 1., 1., 1. } },
                         { 0.6, { 0., 1., 0., 1. } },
                         { 0.8, { 1., 1., 0., 1. } },
                         { 1.0, { 1., 0., 0., 1. } } };
 
  // search
  G4int during[2] = { 0, 0 };
  for(int i = 1; i < NCOLOR; i++)
  {
    if(colormap[i].val >= value)
    {
      during[0] = i - 1;
      during[1] = i;
      break;
    }
  }
 
  // interpolate
  G4double a = std::fabs(value - colormap[during[0]].val);
  G4double b = std::fabs(value - colormap[during[1]].val);
  for(int i = 0; i < 4; i++)
  {
    color[i] =
      (b * colormap[during[0]].rgb[i] + a * colormap[during[1]].rgb[i]) /
      (colormap[during[1]].val - colormap[during[0]].val);
    if(color[i] > 1.)
      color[i] = 1.;
  }
}