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Diffstat (limited to 'nx-X11/extras/freetype2/include/freetype/fttrigon.h')
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1 files changed, 315 insertions, 0 deletions
diff --git a/nx-X11/extras/freetype2/include/freetype/fttrigon.h b/nx-X11/extras/freetype2/include/freetype/fttrigon.h new file mode 100644 index 000000000..0462265e3 --- /dev/null +++ b/nx-X11/extras/freetype2/include/freetype/fttrigon.h @@ -0,0 +1,315 @@ +/***************************************************************************/ +/* */ +/* fttrigon.h */ +/* */ +/* FreeType trigonometric functions (specification). */ +/* */ +/* Copyright 2001, 2003 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_H + +#ifdef FREETYPE_H +#error "freetype.h of FreeType 1 has been loaded!" +#error "Please fix the directory search order for header files" +#error "so that freetype.h of FreeType 2 is found first." +#endif + + +FT_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: */ + /* Return the tangent of a given angle in fixed point format. */ + /* */ + /* @input: */ + /* angle :: The input angle. */ + /* */ + /* @return: */ + /* The tangent value. */ + /* */ + FT_EXPORT( FT_Fixed ) + FT_Tan( FT_Angle angle ); + + + /*************************************************************************/ + /* */ + /* @function: */ + /* FT_Atan2 */ + /* */ + /* @description: */ + /* Return the arc-tangent corresponding to a given vector (x,y) in */ + /* the 2d plane. */ + /* */ + /* @input: */ + /* x :: The horizontal vector coordinate. */ + /* */ + /* y :: The vertical vector coordinate. */ + /* */ + /* @return: */ + /* The arc-tangent value (i.e. angle). */ + /* */ + FT_EXPORT( FT_Angle ) + FT_Atan2( FT_Fixed x, + FT_Fixed y ); + + + /*************************************************************************/ + /* */ + /* @function: */ + /* FT_Angle_Diff */ + /* */ + /* @description: */ + /* Return the difference between two angles. The result is always */ + /* constrained to the ]-PI..PI] interval. */ + /* */ + /* @input: */ + /* angle1 :: First angle. */ + /* */ + /* angle2 :: Second angle. */ + /* */ + /* @return: */ + /* Contrainted value of `value2-value1'. */ + /* */ + FT_EXPORT( FT_Angle ) + FT_Angle_Diff( FT_Angle angle1, + FT_Angle angle2 ); + + + /*************************************************************************/ + /* */ + /* @function: */ + /* FT_Vector_Unit */ + /* */ + /* @description: */ + /* Return the unit vector corresponding to a given angle. After the */ + /* call, the value of `vec.x' will be `sin(angle)', and the value of */ + /* `vec.y' will be `cos(angle)'. */ + /* */ + /* This function is useful to retrieve both the sinus and cosinus of */ + /* a given angle quickly. */ + /* */ + /* @output: */ + /* vec :: The address of target vector. */ + /* */ + /* @input: */ + /* angle :: The address of angle. */ + /* */ + FT_EXPORT( void ) + FT_Vector_Unit( FT_Vector* vec, + FT_Angle angle ); + + + /*************************************************************************/ + /* */ + /* @function: */ + /* FT_Vector_Rotate */ + /* */ + /* @description: */ + /* Rotate a vector by a given angle. */ + /* */ + /* @inout: */ + /* vec :: The address of target vector. */ + /* */ + /* @input: */ + /* angle :: The address of angle. */ + /* */ + FT_EXPORT( void ) + FT_Vector_Rotate( FT_Vector* vec, + FT_Angle angle ); + + + /*************************************************************************/ + /* */ + /* @function: */ + /* FT_Vector_Length */ + /* */ + /* @description: */ + /* Return the length of a given vector. */ + /* */ + /* @input: */ + /* vec :: The address of target vector. */ + /* */ + /* @return: */ + /* The vector length, expressed in the same units that the original */ + /* vector coordinates. */ + /* */ + FT_EXPORT( FT_Fixed ) + FT_Vector_Length( FT_Vector* vec ); + + + /*************************************************************************/ + /* */ + /* @function: */ + /* FT_Vector_Polarize */ + /* */ + /* @description: */ + /* Compute both the length and angle of a given vector. */ + /* */ + /* @input: */ + /* vec :: The address of source vector. */ + /* */ + /* @output: */ + /* length :: The vector length. */ + /* angle :: The vector angle. */ + /* */ + FT_EXPORT( void ) + FT_Vector_Polarize( FT_Vector* vec, + FT_Fixed *length, + FT_Angle *angle ); + + + /*************************************************************************/ + /* */ + /* @function: */ + /* FT_Vector_From_Polar */ + /* */ + /* @description: */ + /* Compute vector coordinates from a length and angle. */ + /* */ + /* @output: */ + /* vec :: The address of source vector. */ + /* */ + /* @input: */ + /* length :: The vector length. */ + /* angle :: The vector angle. */ + /* */ + FT_EXPORT( void ) + FT_Vector_From_Polar( FT_Vector* vec, + FT_Fixed length, + FT_Angle angle ); + + /* */ + + +FT_END_HEADER + +#endif /* __FTTRIGON_H__ */ + + +/* END */ |