/**?KempoApi:?The?Turloc?Toolkit?*****************************/
/**?*????*??????????????????????????????????????????????????**/
/**?**??**??Filename:?ArcBall.cpp???????????????????????????**/
/**???**????Version:??Common????????????????????????????????**/
/**???**????????????????????????????????????????????????????**/
/**?????????????????????????????????????????????????????????**/
/**??Arcball?class?for?mouse?manipulation.??????????????????**/
/**?????????????????????????????????????????????????????????**/
/**?????????????????????????????????????????????????????????**/
/**?????????????????????????????????????????????????????????**/
/**?????????????????????????????????????????????????????????**/
/**??????????????????????????????（C）?1999-2003?Tatewake.com?**/
/**???History:??????????????????????????????????????????????**/
/**???08/17/2003?-?（TJG）?-?Creation?????????????????????????**/
/**???09/23/2003?-?（TJG）?-?Bug?fix?and?optimization?????????**/
/**???09/25/2003?-?（TJG）?-?Version?for?NeHe?basecode?users??**/
/**?????????????????????????????????????????????????????????**/
/*************************************************************/

#include?											//?Header?File?For?Windows
#include?												//?Header?File?For?The?OpenGL32?Library
#include?												//?Header?File?For?The?GLu32?Library
#include?											//?Header?File?For?The?GLaux?Library

#include?“math.h“???????????????????????????????????????????????//?Needed?for?sqrtf

#include?“ArcBall.h“????????????????????????????????????????????//?ArcBall?header

//Arcball?sphere?constants:
//Diameter?is???????2.0f
//Radius?is?????????1.0f
//Radius?squared?is?1.0f

void?ArcBall_t::_mapToSphere（const?Point2fT*?NewPt?Vector3fT*?NewVec）?const
{
????Point2fT?TempPt;
????GLfloat?length;

????//Copy?paramter?into?temp?point
????TempPt?=?*NewPt;

????//Adjust?point?coords?and?scale?down?to?range?of?[-1?...?1]
????TempPt.s.X??=????????（TempPt.s.X?*?this->AdjustWidth）??-?1.0f;
????TempPt.s.Y??=?1.0f?-?（TempPt.s.Y?*?this->AdjustHeight）;

????//Compute?the?square?of?the?length?of?the?vector?to?the?point?from?the?center
????length??????=?（TempPt.s.X?*?TempPt.s.X）?+?（TempPt.s.Y?*?TempPt.s.Y）;

????//If?the?point?is?mapped?outside?of?the?sphere...?（length?>?radius?squared）
????if?（length?>?1.0f）
????{
????????GLfloat?norm;

????????//Compute?a?normalizing?factor?（radius?/?sqrt（length））
????????norm????=?1.0f?/?FuncSqrt（length）;

????????//Return?the?“normalized“?vector?a?point?on?the?sphere
????????NewVec->s.X?=?TempPt.s.X?*?norm;
????????NewVec->s.Y?=?TempPt.s.Y?*?norm;
????????NewVec->s.Z?=?0.0f;
????}
????else????//Else?it‘s?on?the?inside
????{
????????//Return?a?vector?to?a?point?mapped?inside?the?sphere?sqrt（radius?squared?-?length）
????????NewVec->s.X?=?TempPt.s.X;
????????NewVec->s.Y?=?TempPt.s.Y;
????????NewVec->s.Z?=?FuncSqrt（1.0f?-?length）;
????}
}

//Create/Destroy
ArcBall_t::ArcB

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2015-01-24?19:49??17210110OpenGL_Mouse_rotate_physical\
?????目錄???????????0??2015-01-24?21:56??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\
?????文件????????4708??2003-09-25?04:12??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\ArcBall.cpp
?????文件???????18012??2003-09-25?05:02??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\ArcBall.h
?????目錄???????????0??2015-01-25?16:17??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Backup\
?????目錄???????????0??2015-01-24?20:26??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\
?????文件???????20210??2012-10-30?15:49??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\ArcBall.obj
?????文件???????????0??2012-10-30?15:49??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\ArcBall.sbr
?????文件???????28744??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\Mouse_rotate_physical.obj
?????文件???????????0??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\Mouse_rotate_physical.sbr
?????文件?????2507776??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\OpenGL鼠標旋轉物體.bsc
?????文件??????217207??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\OpenGL鼠標旋轉物體.exe
?????文件??????257168??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\OpenGL鼠標旋轉物體.ilk
?????文件??????156672??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\vc60.idb
?????文件???????77824??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Debug\vc60.pdb
?????文件????????7432??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\Mouse_rotate_physical.cpp
?????文件????????4631??2012-10-30?16:02??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.dsp
?????文件?????????544??2012-10-30?15:44??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.dsw
?????文件???????58368??2012-10-31?22:08??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.ncb
?????文件???????55808??2012-10-31?22:08??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.opt
?????文件????????1166??2012-10-31?22:06??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.plg
?????文件????29163520??2015-01-24?21:56??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.sdf
?????文件?????????993??2015-01-24?20:26??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.sln
?????文件???????15360??2015-01-24?21:56??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.v12.suo
?????文件????????6657??2015-01-24?20:26??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.vcxproj
?????文件????????1208??2015-01-24?20:26??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\OpenGL鼠標旋轉物體.vcxproj.filters
?????文件???????34508??2015-01-24?20:26??17210110OpenGL_Mouse_rotate_physical\OpenGL鼠標旋轉物體及剪切平面\UpgradeLog.htm