#include?
#include?“ArcBall.h“

//軌跡球參數:
//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;

????//復制到臨時變量
????TempPt?=?*NewPt;

????//把長寬調整到[-1?...?1]區間
????TempPt.s.X??=?（TempPt.s.X?*?this->AdjustWidth）??-?1.0f;
????TempPt.s.Y??=?1.0f?-?（TempPt.s.Y?*?this->AdjustHeight）;

????//計算長度的平方
????length?=?（TempPt.s.X?*?TempPt.s.X）?+?（TempPt.s.Y?*?TempPt.s.Y）;

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

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

????????//設置z坐標為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
????else
????{
????????//利用半徑的平方為1求出z坐標
????????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?????=0.0f;
????this->StVec.s.Y?????=?0.0f;
????this->StVec.s.Z?????=?0.0f;

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


????Matrix4fSetIdentity（&Transform）;
????Matrix3fSetIdentity（&LastRot）;
????Matrix3fSetIdentity（&ThisRot）;

????this->isDragging=false;
????this->isClicked=?false;
????this->isRClicked?=?false;
????this->isZooming?=?false;
????this->zoomRate?=?1;
????this->setBounds（NewWidth?NewHeight）;
}

void?ArcBall_t::upstate（）
{
????if（!this->isZooming?&&?this->isRClicked）{?//?開始拖動
????????this->isZooming?=?true;?//?設置拖動為變量為true
????????this->LastPt?=?this->MousePt;
????????this->lastZoomRate?=?this->zoomRate;
????}
????else?if（this->isZooming）{//正在拖動
????????if（this->isRClicked）{????????????????//拖動
????????????Point2fSub（&this->MousePt?&this->LastPt）;
????????????this->zoomRate?=?this->lastZoomRate?+?this->MousePt.s.X?*?this->AdjustWidth?*?2;
????????}
????????else{//停止拖動
????????????this->isZooming?=?false;
????????}
????}
????else?if?（!this->isDragging?&&?this->isClicked）{?????????????????????//?如果沒有拖動
????????this->isDragging?=?true;????????????????????????????????????????//?設置拖動為變量為true
????????this->LastRot?=?this->ThisRot;
????????this->click（&this->MousePt）;
????}
????else?if（this->isDragging）{
????????if?（this->isClicked）{????????????????????????????????????????????//如果按住拖動
????????????Quat4fT?????ThisQuat;

????????????this->drag（&this->MousePt?&ThisQuat）;????????????????????????//?更新軌跡球的變量
????????????Matrix3fSetRotationFromQuat4f（&this->ThisRot?&ThisQuat）;????????//?計算旋轉量
????????????Matrix3fMulMatrix3f（&this->ThisRot?&this->LastRot）;
????????????Matrix4fSetRotationFromMatrix3f（&this->Transform?&this->ThisRot）;
????????}
????????else??//?如果放開鼠標，設置拖動為false
????????????this->isDragging?=?false;
????}
}

//按下鼠標記錄當前對應的軌跡球的位置
void????ArcBall_t::click（co

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????4299??2014-03-13?11:14??guijiqiu\ArcBall.cpp

?????文件??????12735??2014-03-13?11:08??guijiqiu\ArcBall.h

?????文件????????387??2014-03-12?22:24??guijiqiu\guijiqiu.pro

?????文件??????17903??2014-03-14?10:46??guijiqiu\guijiqiu.pro.user

?????文件????????175??2014-03-12?22:22??guijiqiu\main.cpp

?????文件???????6100??2014-03-14?10:46??guijiqiu\widget.cpp

?????文件???????6062??2014-03-14?15:05??guijiqiu\widget.cpp.autosave

?????文件????????546??2014-03-13?09:49??guijiqiu\widget.h

?????目錄??????????0??2014-03-14?15:05??guijiqiu

-----------?---------??----------?-----??----

????????????????48207????????????????????9