Tutorial 14 - Camera Control - Part 1

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以下只关注变化部分：

camera.h:

#ifndef CAMERA_H#defineCAMERA_H#include "math_3d.h"//==================================================================//类名：Camera//功能：    封装摄像机的所有操作，该类保存摄像机的参数，基于接收的事件来改变这些参数，从而控制摄像机的运动。//==================================================================class Camera{public:    Camera();    Camera(const Vector3f &Pos, const Vector3f &Target, const Vector3f &Up);    //==================================================================    //函数名：  OnKeyboard    //功能：    当按下上下方向键时候，摄像机会沿着lookat方向移动，    //而左右方向键则会使摄像机沿着左右方向移动，注意，移动的是摄像机    //输入参数：int Key按下的特殊键    //返回值：  void    //==================================================================    bool OnKeyboard(int Key);    const Vector3f &GetPos() const    {        return m_pos;    }    const Vector3f &GetTarget() const    {        return m_target;    }    const Vector3f &GetUp() const    {        return m_up;    }private:    Vector3f m_pos;    Vector3f m_target;    Vector3f m_up;};#endif/* CAMERA_H */

camera.cpp：

#include <GL/freeglut.h>#include "camera.h"const static float StepScale = 0.1f;Camera::Camera(){    m_pos    = Vector3f(0.0f, 0.0f, 0.0f);    m_target = Vector3f(0.0f, 0.0f, 1.0f);    m_up     = Vector3f(0.0f, 1.0f, 0.0f);}Camera::Camera(const Vector3f &Pos, const Vector3f &Target, const Vector3f &Up){    m_pos    = Pos;    m_target = Target;    m_target.Normalize();    m_up     = Up;    m_up.Normalize();}bool Camera::OnKeyboard(int Key){    bool Ret = false;    switch (Key)    {    case GLUT_KEY_UP:    {        m_pos += (m_target * StepScale);        Ret = true;    }    break;    case GLUT_KEY_DOWN:    {        m_pos -= (m_target * StepScale);        Ret = true;    }    break;    case GLUT_KEY_LEFT:    {        Vector3f Left = m_target.Cross(m_up);        Left.Normalize();        Left *= StepScale;        m_pos += Left;        Ret = true;    }    break;    case GLUT_KEY_RIGHT:    {        Vector3f Right = m_up.Cross(m_target);        Right.Normalize();        Right *= StepScale;        m_pos += Right;        Ret = true;    }    break;    }    return Ret;}

main:

static void SpecialKeyboardCB(int Key, int x, int y){    GameCamera.OnKeyboard(Key);}static void InitializeGlutCallbacks(){    glutDisplayFunc(RenderSceneCB);    glutIdleFunc(RenderSceneCB);    glutSpecialFunc(SpecialKeyboardCB);//注册特殊键事件回调函数}