2001-05-12 20:04:08 +02:00
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/***************************************************************************/
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/* */
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/* fttrigon.h */
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/* */
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/* FreeType trigonometric functions (specification). */
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/* */
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/* Copyright 2001 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef __FTTRIGON_H__
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#define __FTTRIGON_H__
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#include FT_FREETYPE_H
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* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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FT_BEGIN_HEADER
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2001-05-12 20:04:08 +02:00
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2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @section: */
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/* computations */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* @type: */
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/* FT_Angle */
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/* */
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/* @description: */
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/* This type is used to model angle values in FreeType. Note that */
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/* the angle is a 16.16 fixed float value expressed in degrees. */
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/* */
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2001-05-12 20:04:08 +02:00
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typedef FT_Fixed FT_Angle;
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* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @macro: */
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/* FT_ANGLE_PI */
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/* */
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/* @description: */
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/* The angle pi expressed in @FT_Angle units. */
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/* */
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2001-05-12 20:04:08 +02:00
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#define FT_ANGLE_PI ( 180L << 16 )
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|
* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @macro: */
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/* FT_ANGLE_2PI */
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/* */
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/* @description: */
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/* The angle 2*pi expressed in @FT_Angle units. */
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/* */
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2001-05-12 20:04:08 +02:00
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#define FT_ANGLE_2PI ( FT_ANGLE_PI * 2 )
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|
* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @macro: */
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/* FT_ANGLE_PI2 */
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/* */
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/* @description: */
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/* The angle pi/2 expressed in @FT_Angle units. */
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/* */
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2001-05-12 20:04:08 +02:00
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#define FT_ANGLE_PI2 ( FT_ANGLE_PI / 2 )
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* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @macro: */
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/* FT_ANGLE_PI4 */
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/* */
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/* @description: */
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/* The angle pi/4 expressed in @FT_Angle units. */
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/* */
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2001-05-12 20:04:08 +02:00
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#define FT_ANGLE_PI4 ( FT_ANGLE_PI / 4 )
|
* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Sin */
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/* */
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/* @description: */
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/* Return the sinus of a given angle in fixed point format. */
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/* */
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/* @input: */
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/* angle :: The input angle. */
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/* */
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/* @return: */
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/* The sinus value. */
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/* */
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/* @note: */
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/* If you need both the sinus and cosinus for a given angle, use the */
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/* function @FT_Vector_Unit. */
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/* */
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FT_EXPORT( FT_Fixed )
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FT_Sin( FT_Angle angle );
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Cos */
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/* */
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/* @description: */
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/* Return the cosinus of a given angle in fixed point format. */
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/* */
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/* @input: */
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/* angle :: The input angle. */
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/* */
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/* @return: */
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/* The cosinus value. */
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/* */
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/* @note: */
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/* If you need both the sinus and cosinus for a given angle, use the */
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/* function @FT_Vector_Unit. */
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/* */
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FT_EXPORT( FT_Fixed )
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2001-06-28 19:49:10 +02:00
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FT_Cos( FT_Angle angle );
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2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Tan */
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/* */
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/* @description: */
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/* Return the tangent of a given angle in fixed point format. */
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/* */
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/* @input: */
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/* angle :: The input angle. */
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/* */
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/* @return: */
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/* The tangent value. */
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/* */
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FT_EXPORT( FT_Fixed )
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FT_Tan( FT_Angle angle );
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Atan2 */
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/* */
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/* @description: */
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/* Return the arc-tangent corresponding to a given vector (x,y) in */
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/* the 2d plane. */
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/* */
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/* @input: */
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/* x :: The horizontal vector coordinate. */
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/* */
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/* y :: The vertical vector coordinate. */
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/* */
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/* @return: */
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/* The arc-tangent value (i.e. angle). */
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/* */
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FT_EXPORT( FT_Angle )
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FT_Atan2( FT_Fixed x,
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FT_Fixed y );
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|
2002-06-27 00:05:05 +02:00
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Angle_Diff */
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/* */
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/* @description: */
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/* Returns the difference between two angles. The result is always */
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/* constrained to the ]-PI..PI] interval */
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/* */
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/* @input: */
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/* angle1 :: first angle */
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/* angle2 :: second angle */
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/* */
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/* @return: */
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/* contrainted value of 'value2-value1' */
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/* */
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FT_EXPORT_DEF( FT_Angle )
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FT_Angle_Dif( FT_Angle angle1,
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FT_Angle angle2 );
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|
2001-06-28 09:17:51 +02:00
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Vector_Unit */
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/* */
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/* @description: */
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/* Return the unit vector corresponding to a given angle. After the */
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/* call, the value of `vec.x' will be `sin(angle)', and the value of */
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/* `vec.y' will be `cos(angle)'. */
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/* */
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/* This function is useful to retrieve both the sinus and cosinus of */
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/* a given angle quickly. */
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/* */
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/* @output: */
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/* vec :: The address of target vector. */
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/* */
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/* @input: */
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/* angle :: The address of angle. */
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/* */
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FT_EXPORT( void )
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FT_Vector_Unit( FT_Vector* vec,
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FT_Angle angle );
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Vector_Rotate */
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/* */
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/* @description: */
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/* Rotate a vector by a given angle. */
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/* */
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/* @inout: */
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/* vec :: The address of target vector. */
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/* */
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/* @input: */
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/* angle :: The address of angle. */
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/* */
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FT_EXPORT( void )
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FT_Vector_Rotate( FT_Vector* vec,
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FT_Angle angle );
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Vector_Length */
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/* */
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/* @description: */
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/* Return the length of a given vector. */
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/* */
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/* @input: */
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/* vec :: The address of target vector. */
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/* */
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/* @return: */
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/* The vector length, expressed in the same units that the original */
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/* vector coordinates. */
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/* */
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FT_EXPORT( FT_Fixed )
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|
FT_Vector_Length( FT_Vector* vec );
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/*************************************************************************/
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/* */
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/* @function: */
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|
|
/* FT_Vector_Normalize */
|
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/* */
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/* @description: */
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/* Normalize a given vector (i.e. compute the equivalent unit */
|
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/* vector). */
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/* */
|
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/* @inout: */
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/* vec :: The address of target vector. */
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/* */
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|
FT_EXPORT( void )
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|
FT_Vector_Normalize( FT_Vector* vec );
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/*************************************************************************/
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/* */
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/* @function: */
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/* FT_Vector_Polarize */
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/* */
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/* @description: */
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/* Compute both the length and angle of a given vector. */
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/* */
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/* @input: */
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/* vec :: The address of source vector. */
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/* */
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/* @output: */
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/* length :: The vector length. */
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/* angle :: The vector angle. */
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/* */
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FT_EXPORT( void )
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FT_Vector_Polarize( FT_Vector* vec,
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FT_Fixed *length,
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FT_Angle *angle );
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* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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/* */
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2001-05-12 20:04:08 +02:00
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2001-06-28 19:49:10 +02:00
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* include/freetype/fttrigon.h, src/base/fttrigon.c, src/base/ftbase.c,
src/base/Jamfile, src/base/rules.mk: adding trigonometric functions
to the core API (using Cordic algorithms).
* builds/top_level.mk, builds/newline, builds/detect.mk: fixed problems
with Make on Windows 2000, as well as problems when "make distclean" is
invoked on a non-Unix platform when there is no "config.mk" in the
current directory..
* builds/freetype.mk: fixed a problem with object deletions under
Dos/Windows/OS/2 systems
* src/tools: added new directory to hold tools and test programs
moved docmaker.py, glnames.py to it..
* src/tools/docmaker.py: improved the script to add the current date
at the footer of each web page (useful to distinguish between versions)
* Jamfile: fixed incorrect HDRMACRO argument.
* TODO: removed the cubic arc bbox computation note, since it has been
fixed recently..
* include/freetype/t1tables.h, include/freetype/config/ftoption.h:
formatting
2001-05-11 16:25:57 +02:00
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FT_END_HEADER
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2001-05-12 20:04:08 +02:00
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#endif /* __FTTRIGON_H__ */
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/* END */
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