color.cc

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#include "stage.hh"
#include "worldfile.hh"
using namespace Stg;

#include "file_manager.hh"

#include <errno.h>

Color::Color( double r, double g, double b, double a )
  : r(r),g(g),b(b),a(a) 
{}

Color::Color() : 
  r(1.0), g(0.0), b(0.0), a(1.0) 
{}

bool Color::operator!=( const Color& other ) const
{
  double epsilon = 1e-4; // small
  return( fabs(r-other.r) > epsilon ||
          fabs(g-other.g) > epsilon ||
          fabs(b-other.b) > epsilon ||
          fabs(a-other.a) > epsilon );
}

Color::Color( const std::string& name) :
  r(1), g(0), b(0), a(1)
{
  if( name == "" )  // empty string?
        return; // red
  
  static FILE *file = NULL;
  static std::map<std::string,Color> table;

  if( file == NULL )
        {
          std::string rgbFile = FileManager::findFile( "rgb.txt" );
          file = fopen( rgbFile.c_str(), "r" );
          
          if( file == NULL )
                {
                  PRINT_ERR1("unable to open color database: %s "
                                         "(try adding rgb.txt's location to your STAGEPATH)",
                                         strerror(errno));

                  exit(0);
                }
          
          PRINT_DEBUG( "Success!" );
          
          // load the file into the map
          while(1)
                {
                  char line[1024];
                  if (!fgets(line, sizeof(line), file))
                        break;

                        // it's a macro or comment line - ignore the line
                        // also ignore empty lines
                        if (line[0] == '!' || line[0] == '#' || line[0] == '%' || line[0] == '\0') 
                                continue;

                        // Trim the trailing space
                        while (strchr(" \t\n", line[strlen(line)-1]))
                                line[strlen(line)-1] = 0;

                        // Read the color
                        int r, g, b;
                        int chars_matched = 0;
                        sscanf( line, "%d %d %d %n", &r, &g, &b, &chars_matched );
                        
                        // Read the name
                        const char* colorname = line + chars_matched;
                        
                        // map the name to the color in the table
                        table[colorname] = Color( r/255.0, g/255.0, b/255.0 );
                }
          fclose(file);
        }
  
  // look up the colorname in the database    
  Color& found = table[name];
  
  this->r = found.r;
  this->g = found.g;
  this->b = found.b;
  this->a = found.a;
}

bool Color::operator==( const Color& other ) const
{
  return( ! ((*this) != other) );
}

Color Color::RandomColor()
{
  return Color(  drand48(), drand48(), drand48() );
}

void Color::Print( const char* prefix ) const
{
  printf( "%s [%.2f %.2f %.2f %.2f]\n", prefix, r,g,b,a );
} 

const Color& Color::Load( Worldfile* wf, const int section )
{
  if( wf->PropertyExists( section, "color" ))
    {      
      const std::string& colorstr = wf->ReadString( section, "color", "" );
      if( colorstr != "" )
        {
          if( colorstr == "random" )
            {
              r = drand48();
              g = drand48();
              b = drand48();
              a = 1.0;
            }
          else
            {
              Color c = Color( colorstr );
              r = c.r;
              g = c.g;
              b = c.b;
              a = c.a;
            }
        }
    }        
  else
    wf->ReadTuple( section, "color_rgba", 0, 4, "ffff", &r, &g, &b, &a );
  
  return *this;
}