/***************************************************************************//*                                                                         *//*  fttrigon.h                                                             *//*                                                                         *//*    FreeType trigonometric functions (specification).                    *//*                                                                         *//*  Copyright 2001 by                                                      *//*  David Turner, Robert Wilhelm, and Werner Lemberg.                      *//*                                                                         *//*  This file is part of the FreeType project, and may only be used,       *//*  modified, and distributed under the terms of the FreeType project      *//*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     *//*  this file you indicate that you have read the license and              *//*  understand and accept it fully.                                        *//*                                                                         *//***************************************************************************/#ifndef __FTTRIGON_H__#define __FTTRIGON_H__#include FT_FREETYPE_HFT_BEGIN_HEADER  /*************************************************************************/  /*                                                                       */  /* @section:                                                             */  /*   computations                                                        */  /*                                                                       */  /*************************************************************************/  /*************************************************************************/  /*                                                                       */  /* @type:                                                                */  /*    FT_Angle                                                           */  /*                                                                       */  /* @description:                                                         */  /*    This type is used to model angle values in FreeType.  Note that    */  /*    the angle is a 16.16 fixed float value expressed in degrees.       */  /*                                                                       */  typedef FT_Fixed  FT_Angle;  /*************************************************************************/  /*                                                                       */  /* @macro:                                                               */  /*    FT_ANGLE_PI                                                        */  /*                                                                       */  /* @description:                                                         */  /*   The angle pi expressed in @FT_Angle units.                          */  /*                                                                       */#define FT_ANGLE_PI  ( 180L << 16 )  /*************************************************************************/  /*                                                                       */  /* @macro:                                                               */  /*    FT_ANGLE_2PI                                                       */  /*                                                                       */  /* @description:                                                         */  /*    The angle 2*pi expressed in @FT_Angle units.                       */  /*                                                                       */#define FT_ANGLE_2PI  ( FT_ANGLE_PI * 2 )  /*************************************************************************/  /*                                                                       */  /* @macro:                                                               */  /*    FT_ANGLE_PI2                                                       */  /*                                                                       */  /* @description:                                                         */  /*    The angle pi/2 expressed in @FT_Angle units.                       */  /*                                                                       */#define FT_ANGLE_PI2  ( FT_ANGLE_PI / 2 )  /*************************************************************************/  /*                                                                       */  /* @macro:                                                               */  /*    FT_ANGLE_PI4                                                       */  /*                                                                       */  /* @description:                                                         */  /*    The angle pi/4 expressed in @FT_Angle units.                       */  /*                                                                       */#define FT_ANGLE_PI4  ( FT_ANGLE_PI / 4 )  /*************************************************************************/  /*                                                                       */  /* @function:                                                            */  /*    FT_Sin                                                             */  /*                                                                       */  /* @description:                                                         */  /*    Return the sinus of a given angle in fixed point format.           */  /*                                                                       */  /* @input:                                                               */  /*    angle :: The input angle.                                          */  /*                                                                       */  /* @return:                                                              */  /*    The sinus value.                                                   */  /*                                                                       */  /* @note:                                                                */  /*    If you need both the sinus and cosinus for a given angle, use the  */  /*    function @FT_Vector_Unit.                                          */  /*                                                                       */  FT_EXPORT( FT_Fixed )  FT_Sin( FT_Angle  angle );  /*************************************************************************/  /*                                                                       */  /* @function:                                                            */  /*    FT_Cos                                                             */  /*                                                                       */  /* @description:                                                         */  /*    Return the cosinus of a given angle in fixed point format.         */  /*                                                                       */  /* @input:                                                               */  /*    angle :: The input angle.                                          */  /*                                                                       */  /* @return:                                                              */  /*    The cosinus value.                                                 */  /*                                                                       */  /* @note:                                                                */  /*    If you need both the sinus and cosinus for a given angle, use the  */  /*    function @FT_Vector_Unit.                                          */  /*                                                                       */  FT_EXPORT( FT_Fixed )  FT_Cos( FT_Angle  angle );  /*************************************************************************/  /*                                                                       */  /* @function:                                                            */  /*    FT_Tan                                                             */  /*                                                                       */  /* @description:                                                         */