第07讲 文本显示.doc

第7讲 文本显示1、2D文本显示在Direct3D中，ID3DXFont接口用于在DirecteD应用程序中创建字体与实现2D文本的绘制。（1）定义d3d字体对象指针LPD3DXFONT g_pFont = 0; /字体对象（2）创建ID3DXFont接口对象HRESULTD3DXCreateFont(LPDIRECT3DDEVICE9pDevice,HFONThFont,LPD3DXFONT*ppFont);/HFONT TextFont=CreateFont( 12, 6,0, 0, FW_NORMAL, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS, PROOF_QUALITY, FIXED_PITCH | FF_SCRIPT, 宋体 );（3）调用ID3DXFont接口对象g_pFont的接口DrawText方法绘制2D文本。INTDrawText(LPCSTRpString,INTCount,LPRECTpRect,DWORDFormat,D3DCOLORColor); (4) /释放字体对象if(g_pFont != NULL)g_pFont-Release();代码：/=/ Desc: 二维字体/=#include #include #include /-/ Desc: 全局变量/-LPDIRECT3D9 g_pD3D = NULL; /Direct3D对象LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; /Direct3D设备对象LPD3DXFONT g_pFont = 0; /字体对象WCHAR* strText = L欢迎学习Direct3D 游戏编程!;RECT clientRect; /绘制字体的位置矩阵/HFONT TextFont=CreateFont( 12, 6,0, 0, FW_NORMAL, FALSE, FALSE, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS, PROOF_QUALITY, FIXED_PITCH | FF_SCRIPT, 宋体 );/-/ Desc: 初始化Direct3D/-HRESULT InitD3D( HWND hWnd )/创建Direct3D对象, 该对象用于创建Direct3D设备对象 if( NULL = ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) ) return E_FAIL;/设置D3DPRESENT_PARAMETERS结构, 准备创建Direct3D设备对象 D3DPRESENT_PARAMETERS d3dpp; ZeroMemory( &d3dpp, sizeof(d3dpp) ); d3dpp.Windowed = TRUE; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;/创建Direct3D设备对象 if( FAILED( g_pD3D-CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &g_pd3dDevice ) ) ) return E_FAIL; HFONT TextFont=CreateFont(0,0,0,0,0,0,0,0,0,0,0,0,0, LArial);/创建字体对象if (FAILED(D3DXCreateFont(g_pd3dDevice,TextFont, &g_pFont) return E_FAIL;/获取窗口客户区GetClientRect(hWnd, &clientRect);return S_OK;/-/ Desc: 释放创建的对象/-VOID Cleanup()/释放字体对象if(g_pFont != NULL)g_pFont-Release();/释放Direct3D设备对象 if( g_pd3dDevice != NULL) g_pd3dDevice-Release();/释放Direct3D对象 if( g_pD3D != NULL) g_pD3D-Release();/-/ Desc: 渲染图形/-VOID Render() /清空后台缓冲区 g_pd3dDevice-Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(45, 50, 170), 1.0f, 0 ); /开始在后台缓冲区绘制图形 if( SUCCEEDED( g_pd3dDevice-BeginScene() ) ) g_pFont-DrawText(strText, (int)wcslen(strText), &clientRect, DT_SINGLELINE|DT_NOCLIP|DT_CENTER|DT_VCENTER, 0xffffffff);/结束在后台缓冲区绘制图形 g_pd3dDevice-EndScene(); /将在后台缓冲区绘制的图形提交到前台缓冲区显示 g_pd3dDevice-Present( NULL, NULL, NULL, NULL );/-/ Desc: 消息处理/-LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) switch( msg ) case WM_DESTROY:Cleanup(); PostQuitMessage( 0 ); return 0; return DefWindowProc( hWnd, msg, wParam, lParam );/-/ Desc: 入口函数/-int WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )/注册窗口类 WNDCLASSEX wc = sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, LClassName, NULL ; RegisterClassEx( &wc );/创建窗口 HWND hWnd = CreateWindow( LClassName, L二维字体, WS_OVERLAPPEDWINDOW, 200, 100, 800, 800, GetDesktopWindow(), NULL, wc.hInstance, NULL );/初始化Direct3Dif( SUCCEEDED( InitD3D( hWnd ) ) ) /显示窗口ShowWindow( hWnd, SW_SHOWDEFAULT );UpdateWindow( hWnd );/进入消息循环MSG msg;ZeroMemory( &msg, sizeof(msg) );while( msg.message!=WM_QUIT )if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )TranslateMessage( &msg );DispatchMessage( &msg );elseRender(); /渲染图形 UnregisterClass( LClassName, wc.hInstance ); return 0;2、3D字体显示（1）对于三维文本，需要通过D3DXCreateText函数根据设备环境（DC）创建包含文本的一个网格对象，使用网格实现3D文本，可以显著地增加文本的立体感，并能够体现出文本在受到光照后的明暗变换效果。LPD3DXMESH g_pTextMesh=NULL; /3D文本网格对象（2）初始化3D文本函数：HDC CreateCompatibleDC(HDC hdc);hdc：现有设备上下文环境的句柄，如果该句柄为NULL，该函数创建一个与应用程序的当前显示器兼容的内存设备上下文环境。当不再需要内存设备上下文环境时，可调用DeleteDc函数删除它。1）创建设备环境HDC hdc=CreateCompatibleDC(0);/创建设备环境2）创建字体函数：HFONT CreateFont(int nHeight, / logical height of font height int nWidth, / logical average character width int nEscapement, / angle of escapement int nOrientation, / base-line orientation angle int fnWeight, / font weight如400表示标准体，700表示黑（粗）体，如果此值为0，则使用缺省的权值。DWORD fdwItalic, / italic attribute flag DWORD fdwUnderline, / underline attribute flag DWORD fdwStrikeOut, / strikeout attribute flag删除线DWORD fdwCharSet, / character set identifier DWORD fdwOutputPrecision, / output precision指定输出精度DWORD fdwClipPrecision, / clipping precision指定裁剪精度DWORD fdwQuality, / output quality指向输出质量DWORD fdwPitchAndFamily, / pitch and family 间距LPCTSTR lpszFace / pointer to typeface name string );该函数创建一种有特殊性的逻辑字体，此逻辑字体可以在后面被任何设备选择。InitD3D()中/创建字体HFONT hFont = CreateFont(0, 0, 0, 0, FW_BOLD , false, false, false, DEFAULT_CHARSET,OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE, LArial); 3）/将字体选进设备描述表InitD3D（）中SelectObject(hdc, hFont);4）创建三维文本网格模型HRESULTD3DXCreateText(LPDIRECT3DDEVICE9pDevice,HDChDC,LPCTSTRpText,FLOATDeviation,/指定弦偏差的最大值FLOATExtrusion,/指定文本z轴负方向突出的总量LPD3DXMESH*ppMesh,LPD3DXBUFFER*ppAdjacency,/指向包含相关输出信息缓冲区指针，可以设为NULLLPGLYPHMETRICSFLOATpGlyphMetrics /指向包含所有字符相关数据的数组);/创建三维文本网格模型if( FAILED( D3DXCreateText( g_pd3dDevice, hdc, L三维字体, 0.001f, 0.4f, &g