[D3D_XD项目]D3DCamera类

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本文介绍了一个D3DCamera类的设计与实现细节，该类用于Direct3D应用程序中创建和控制摄像机视角。文章详细解释了如何通过键盘和鼠标操作来调整摄像机的位置和方向。

//----------------------------------------------------------------------------- // 文件: D3DCamera.h // // 描述: D3DCamera类的头文件，定义变量，函数。 // // 更新: 2009-03-19 by Ninsun //----------------------------------------------------------------------------- #pragma once #include <d3dx9.h> #pragma comment (lib, "d3d9.lib") #pragma comment (lib, "d3dx9.lib") #include "D3DWindow.h" class D3DCamera { public: D3DCamera(LPDIRECT3DDEVICE9 _pd3dDevice); public: ~D3DCamera(void); public: VOID resetCamera(); VOID applyCamera(); LRESULT mouseProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ); VOID keyProc(); private: VOID setCamera(); public: private: LPDIRECT3DDEVICE9 m_pd3dDevice; // D3D设备 BOOL m_bIsRotaion; // 是否旋转 D3DXVECTOR3 m_vPos; // 摄像机位置 D3DXVECTOR3 m_vLookAt; // 摄像机视点 D3DXVECTOR3 m_vUp; // 摄像机顶方向 D3DXVECTOR3 m_vRight; // 摄像机右方向 D3DXVECTOR3 m_vDirection; // 摄像机面向方向 FLOAT m_fNear; // 视角最近距离 FLOAT m_fFar; // 视角最远距离 FLOAT m_fFOV; // 视角可视角度 FLOAT m_fAspect; // 视角宽高比 FLOAT m_fMaxPitch; // 视角仰视最大值 FLOAT m_fMinPitch; // 视角俯视最大值 FLOAT m_fCameraYawAngle; // 摄像机Y轴旋转角度 FLOAT m_fCameraPitchAngle; // 摄像机X轴旋转角度 D3DXVECTOR3 m_vDelta; // 摄像机移动向量 FLOAT m_fSpeed; // 摄像机移动速度 POINT m_LastPoint; // 上一个鼠标位置 };
//----------------------------------------------------------------------------- // 文件: D3DCamera.cpp // // 描述: D3DCamera类,用于架设一个可以操纵的摄像机 // // 更新: 2009-03-19 by Ninsun //----------------------------------------------------------------------------- #include "D3DCamera.h" #include "D3DImage.h" //----------------------------------------------------------------------------- // 名称: D3DCamera() // 描述: 自定义构造函数 //----------------------------------------------------------------------------- D3DCamera::D3DCamera(LPDIRECT3DDEVICE9 _pd3dDevice) { m_pd3dDevice = _pd3dDevice; // 设置摄像机位置，视点，顶方向 D3DXMATRIXA16 matView; m_vPos = D3DXVECTOR3(0.0f, 0.0f, -WND_HEIGHT/2*ZOOM); // 摄像机位置 m_vLookAt = D3DXVECTOR3(0.0f, 0.0f, 0.0f); // 摄像机视点 m_vUp = D3DXVECTOR3(0.0f, 1.0f, 0.0f); // 摄像机顶方向 D3DXMatrixLookAtLH( &matView, &m_vPos, &m_vLookAt, &m_vUp ); m_pd3dDevice->SetTransform( D3DTS_VIEW, &matView ); // 使用透视投影矩阵，设置摄像机视角， D3DXMATRIXA16 matProj; D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI / 4, 4.0f/3.0f, 0.0001f, 2000.0f ); m_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj ); // 设置其他变量 m_vDirection = m_vLookAt - m_vPos; D3DXVec3Cross( &m_vRight, &m_vUp, &m_vDirection ); m_fCameraYawAngle = D3DX_PI; m_fCameraPitchAngle = 0; m_fSpeed = ZOOM*0.5; m_bIsRotaion = FALSE; } D3DCamera::~D3DCamera(void) { } //----------------------------------------------------------------------------- // 名称: setCamera() // 描述: 设置摄像机位置，看点 //----------------------------------------------------------------------------- VOID D3DCamera::setCamera() { D3DXMATRIXA16 matView; D3DXMatrixLookAtLH( &matView, &m_vPos, &m_vLookAt, &m_vUp ); m_pd3dDevice->SetTransform( D3DTS_VIEW, &matView ); } //----------------------------------------------------------------------------- // 名称: resetCamera() // 描述: 设置摄像机位置，看点 //----------------------------------------------------------------------------- VOID D3DCamera::resetCamera() { m_vPos = D3DXVECTOR3(0.0f, 0.0f, -WND_HEIGHT/2*ZOOM); // 摄像机位置 m_vLookAt = D3DXVECTOR3(0.0f, 0.0f, 0.0f); // 摄像机视点 m_vUp = D3DXVECTOR3(0.0f, 1.0f, 0.0f); // 摄像机顶方向 m_vDirection = m_vLookAt - m_vPos; D3DXVec3Cross( &m_vRight, &m_vUp, &m_vDirection ); m_fCameraYawAngle = D3DX_PI; m_fCameraPitchAngle = 0; setCamera(); } //----------------------------------------------------------------------------- // 名称: applyCamera() // 描述: 应用摄像机变换 //----------------------------------------------------------------------------- VOID D3DCamera::applyCamera() { POINT ptCurrentPos; POINT ptDeltaPos; if(m_bIsRotaion) { // 计算鼠标偏移 GetCursorPos(&ptCurrentPos); ptDeltaPos.x = ptCurrentPos.x - m_LastPoint.x; ptDeltaPos.y = ptCurrentPos.y - m_LastPoint.y; SetCursorPos(m_LastPoint.x,m_LastPoint.y); //m_LastPoint = ptCurrentPos; float fYaw = ptDeltaPos.x*0.0025f; float fPitch = ptDeltaPos.y*0.0025f; // 根据鼠标偏移计算欧拉角 m_fCameraYawAngle += fYaw; m_fCameraPitchAngle -= fPitch; // 限定俯仰角大小 if(m_fCameraPitchAngle > D3DX_PI*0.49f) m_fCameraPitchAngle = D3DX_PI*0.49f; else if(m_fCameraPitchAngle < -D3DX_PI*0.49f) m_fCameraPitchAngle = -D3DX_PI*0.49f; } // 根据欧拉角Yaw，Pitch计算摄像机的旋转矩阵 D3DXMATRIX matCameraRotation; ZeroMemory(&matCameraRotation, sizeof(D3DXMATRIX)); D3DXMatrixRotationYawPitchRoll(&matCameraRotation, m_fCameraYawAngle, m_fCameraPitchAngle,0.0f); // 根据旋转矩阵将摄像机的朝向和顶方向变换 D3DXVECTOR3 vWorldUp, vWorldAhead; D3DXVECTOR3 vLocalUp = D3DXVECTOR3(0,1,0); D3DXVECTOR3 vLocalAhead = D3DXVECTOR3(0,0,-WND_HEIGHT/2*ZOOM); D3DXVec3TransformCoord( &vWorldUp, &vLocalUp, &matCameraRotation ); D3DXVec3TransformCoord( &vWorldAhead, &vLocalAhead, &matCameraRotation ); // 将局部偏移量转到全局坐标 D3DXVECTOR3 vWorldDelta; D3DXVec3TransformCoord( &vWorldDelta, &m_vDelta, &matCameraRotation ); // 根据偏移量计算视点位置 m_vPos += vWorldDelta; if(m_vPos.y < 0) m_vPos.y = 0; if(m_vPos.y > ZOOM*200) m_vPos.y = ZOOM*200; m_vLookAt = m_vPos + vWorldAhead; // 设置摄像机 setCamera(); // 更新变量 m_vDirection = m_vLookAt - m_vPos; m_vUp = vWorldUp; D3DXVec3Cross( &m_vRight, &m_vUp, &m_vDirection ); } //----------------------------------------------------------------------------- // 名称: mouseProc() // 描述: 鼠标消息处理 //----------------------------------------------------------------------------- LRESULT D3DCamera::mouseProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) { switch( msg ) { case WM_RBUTTONDOWN: { m_bIsRotaion = true; SetCapture(hWnd); GetCursorPos(&m_LastPoint); } break; case WM_RBUTTONUP: { m_bIsRotaion = false; ReleaseCapture(); } break; } return 0; } //----------------------------------------------------------------------------- // 名称: keyProc() // 描述: 键盘消息处理 //----------------------------------------------------------------------------- VOID D3DCamera::keyProc() { static char _up = VK_SPACE; static char _down = 'X'; static char _left = 'A'; static char _right = 'D'; static char _head = 'W'; static char _back = 'S'; static char _reset = 'R'; m_vDelta = D3DXVECTOR3(0, 0, 0); if( GetKeyState(_head) & 0x80 ) { m_vDelta.z -= m_fSpeed; } if( GetKeyState(_back) & 0x80 ) { m_vDelta.z += m_fSpeed; } if( GetKeyState(_left) & 0x80 ) { m_vDelta.x += m_fSpeed; } if( GetKeyState(_right) & 0x80 ) { m_vDelta.x -= m_fSpeed; } if( GetKeyState(_up) & 0x80 ) { m_vPos.y += m_fSpeed; } if( GetKeyState(_down) & 0x80 ) { m_vPos.y -= m_fSpeed; } if( GetKeyState(_reset) & 0x80 ) { resetCamera(); } }