#include?								
#include?“glew.h“									
#include?“glaux.h“									

#include?“math.h“????????????????????????????????????
#include?“ArcBall.h“?????????????????????????????????

//軌跡球參數(shù):
//直徑					2.0f
//半徑					1.0f
//半徑平方				1.0f


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

????//復(fù)制到臨時(shí)變量
????TempPt?=?*NewPt;

????//把長(zhǎng)寬調(diào)整到[-1?...?1]區(qū)間
????TempPt.s.X??=????????（TempPt.s.X?*?this->AdjustWidth）??-?1.0f;
????TempPt.s.Y??=?1.0f?-?（TempPt.s.Y?*?this->AdjustHeight）;

????//計(jì)算長(zhǎng)度的平方
????length??????=?（TempPt.s.X?*?TempPt.s.X）?+?（TempPt.s.Y?*?TempPt.s.Y）;

????//如果點(diǎn)映射到球的外面
????if?（length?>?1.0f）
????{
????????GLfloat?norm;

????????//縮放到球上
????????norm????=?1.0f?/?FuncSqrt（length）;

????????//設(shè)置z坐標(biāo)為0
????????NewVec->s.X?=?TempPt.s.X?*?norm;
????????NewVec->s.Y?=?TempPt.s.Y?*?norm;
????????NewVec->s.Z?=?0.0f;
????}
	//如果在球內(nèi)
????else???
????{
????????//利用半徑的平方為1求出z坐標(biāo)
????????NewVec->s.X?=?TempPt.s.X;
????????NewVec->s.Y?=?TempPt.s.Y;
????????NewVec->s.Z?=?FuncSqrt（1.0f?-?length）;
????}
}

ArcBall_t::ArcBall_t（GLfloat?NewWidth?GLfloat?NewHeight）
{
????this->StVec.s.X?????=
????this->StVec.s.Y?????=?
????this->StVec.s.Z?????=?

????this->EnVec.s.X?????=
????this->EnVec.s.Y?????=?
????this->EnVec.s.Z?????=?0.0f;

????this->setBounds（NewWidth?NewHeight）;
}

//按下鼠標(biāo)記錄當(dāng)前對(duì)應(yīng)的軌跡球的位置
void????ArcBall_t::click（const?Point2fT*?NewPt）
{
????this->_mapToSphere（NewPt?&this->StVec）;
}

//鼠標(biāo)拖動(dòng)計(jì)算旋轉(zhuǎn)四元數(shù)
void????ArcBall_t::drag（const?Point2fT*?NewPt?Quat4fT*?NewRot）
{
????//新的位置
????this->_mapToSphere（NewPt?&this->EnVec）;

????//計(jì)算旋轉(zhuǎn)
????if?（NewRot）
????{
????????Vector3fT??Perp;

????????//計(jì)算旋轉(zhuǎn)軸
????????Vector3fCross（&Perp?&this->StVec?&this->EnVec）;

????????//如果不為0
????????if?（Vector3fLength（&Perp）?>?Epsilon）????
????????{
????????????//記錄旋轉(zhuǎn)軸
????????????NewRot->s.X?=?Perp.s.X;
????????????NewRot->s.Y?=?Perp.s.Y;
????????????NewRot->s.Z?=?Perp.s.Z;
????????????//在四元數(shù)中w=cos（a/2），a為旋轉(zhuǎn)的角度
????????????NewRot->s.W=?Vector3fDot（&this->StVec?&this->EnVec）;
????????}
		//是0，說(shuō)明沒(méi)有旋轉(zhuǎn)
????????else?????????????????????????????????
????????{
????????????NewRot->s.X?=?
????????????NewRot->s.Y?=?
????????????NewRot->s.Z?=?
????????????NewRot->s.W?=?0.0f;
????????}
????}
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件????7719936??2009-04-26?12:44??bunny\48_ArcBall.ncb

?????文件???????4537??2009-05-15?09:54??bunny\48_ArcBall.vcproj

?????文件???????1423??2009-05-15?15:18??bunny\48_ArcBall.vcproj.20090401-1254.Administrator.user

?????文件???????2516??2006-08-21?07:18??bunny\ArcBall.cpp

?????文件??????13088??2006-08-13?12:53??bunny\ArcBall.h

?????文件??????32904??2009-05-15?09:54??bunny\bunny.aps

?????文件???????9361??2009-05-15?10:38??bunny\bunny.cpp

?????文件????2417019??2000-10-11?01:34??bunny\bunny.dat

?????文件????9415680??2009-05-15?15:18??bunny\bunny.ncb

?????文件???????1418??2009-05-15?09:54??bunny\bunny.rc

?????文件????????879??2009-04-26?10:04??bunny\bunny.sln

????..A..H.?????25600??2009-05-15?15:18??bunny\bunny.suo

?????文件?????593920??2009-05-15?10:38??bunny\Debug\48_ArcBall.exe

?????文件????????146??2009-04-26?10:05??bunny\Debug\48_ArcBall.exe.embed.manifest

?????文件????????212??2009-04-26?10:05??bunny\Debug\48_ArcBall.exe.embed.manifest.res

?????文件????????145??2009-05-15?10:38??bunny\Debug\48_ArcBall.exe.intermediate.manifest

?????文件????1296180??2009-05-15?10:38??bunny\Debug\48_ArcBall.ilk

?????文件??????48332??2009-04-26?11:15??bunny\Debug\48_ArcBall.obj

?????文件????2345984??2009-05-15?10:38??bunny\Debug\48_ArcBall.pdb

?????文件??????28647??2009-04-26?10:05??bunny\Debug\ArcBall.obj

?????文件??????10062??2009-05-15?10:38??bunny\Debug\BuildLog.htm

?????文件????2417019??2000-10-11?01:34??bunny\Debug\bunny.dat

?????文件??????55068??2009-05-15?10:38??bunny\Debug\bunny.obj

?????文件?????192512??2006-03-04?03:19??bunny\Debug\glew32.dll

?????文件?????121856??2004-08-04?08:52??bunny\Debug\glu32.dll

?????文件?????169984??1998-08-18?23:25??bunny\Debug\glut32.dll

?????文件?????????67??2009-05-15?10:38??bunny\Debug\mt.dep

?????文件??????39995??2009-05-15?09:41??bunny\Debug\NeHeGL.obj

?????文件?????713728??2004-08-04?08:52??bunny\Debug\opengl32.dll

?????文件?????396288??2009-05-15?10:38??bunny\Debug\vc80.idb

............此處省略26個(gè)文件信息