13 #include "qwt_global.h"    23 #define _USE_MATH_DEFINES 1    27 #include "qwt_global.h"    32 #define M_PI_2 (1.57079632679489661923)    36 #define LOG_MIN 1.0e-100    41 #define LOG_MAX 1.0e100    45 QWT_EXPORT 
double qwtGetMin( 
const double *array, 
int size );
    46 QWT_EXPORT 
double qwtGetMax( 
const double *array, 
int size );
    48 QWT_EXPORT 
double qwtNormalizeRadians( 
double radians );
    49 QWT_EXPORT 
double qwtNormalizeDegrees( 
double degrees );
    63 inline int qwtFuzzyCompare( 
double value1, 
double value2, 
double intervalSize )
    65     const double eps = qAbs( 1.0e-6 * intervalSize );
    67     if ( value2 - value1 > eps )
    70     if ( value1 - value2 > eps )
    77 inline bool qwtFuzzyGreaterOrEqual( 
double d1, 
double d2 )
    79     return ( d1 >= d2 ) || qFuzzyCompare( d1, d2 );
    82 inline bool qwtFuzzyLessOrEqual( 
double d1, 
double d2 )
    84     return ( d1 <= d2 ) || qFuzzyCompare( d1, d2 );
    88 inline int qwtSign( 
double x )
    99 inline double qwtSqr( 
double x )
   105 inline double qwtFastAtan( 
double x )
   108         return -M_PI_2 - x / ( x * x + 0.28 );
   111         return M_PI_2 - x / ( x * x + 0.28 );
   113     return x / ( 1.0 + x * x * 0.28 );
   117 inline double qwtFastAtan2( 
double y, 
double x )
   120         return qwtFastAtan( y / x );
   124         const double d = qwtFastAtan( y / x );
   125         return ( y >= 0 ) ? d + M_PI : d - M_PI;
   138 inline double qwtRadians( 
double degrees )
   140     return degrees * M_PI / 180.0;
   144 inline double qwtDegrees( 
double degrees )
   146     return degrees * 180.0 / M_PI;