00001
00005 #ifndef _SG_PERSPARAM_HXX
00006 #define _SG_PERSPARAM_HXX 1
00007
00008 #include <simgear/math/sg_random.h>
00009
00010
00011 template <class T>
00012 class SGPersonalityParameter {
00013 public:
00014 SGPersonalityParameter(const SGPropertyNode *props, const char *name, T defval )
00015 : _var( defval ), _min( defval ), _max( defval ) {
00016 const SGPropertyNode* node = props->getNode( name );
00017 if ( node != 0 ) {
00018 const SGPropertyNode* rand_n = node->getNode( "random" );
00019 if ( rand_n != 0 ) {
00020 _min = getNodeValue( rand_n, "min", (T)0 );
00021 _max = getNodeValue( rand_n, "max", (T)1 );
00022 shuffle();
00023 } else {
00024 _var = _min = _max = getNodeValue( props, name, defval );
00025 }
00026 }
00027 }
00028 SGPersonalityParameter<T> &operator=( T v ) { _var = v; return *this; }
00029 SGPersonalityParameter<T> &operator+=( T v ) { _var += v; return *this; }
00030 SGPersonalityParameter<T> &operator-=( T v ) { _var -= v; return *this; }
00031 T shuffle() { return ( _var = _min + sg_random() * ( _max - _min ) ); }
00032 T value() const { return _var; }
00033 T getNodeValue(const SGPropertyNode *props, const char *name, T defval ) const;
00034 operator T() const { return _var; }
00035
00036 private:
00037 T _var;
00038 T _min;
00039 T _max;
00040 };
00041
00042 template <> double
00043 SGPersonalityParameter<double>::getNodeValue( const SGPropertyNode *props,
00044 const char *name,
00045 double defval ) const;
00046
00047 #endif // _SG_PERSPARAM_HXX
00048
