DirectX 9.0 C++ 教程 字体 迟到的helloworld
效果图：
本文只设计到使用ID3DXFont接口来绘制文本，其他的方面参考DirectX 9.0 C++ 教程 第一个程序
1.说明
ID3DXFont接口内部使用GDI绘制文本，相应地在性能上会有一点的损失。但是它支持ANSI and Unicode 字符串。
2.创建ID3DXFont接口对象
其实可以用D3DXCreateFont和D3DXCreateFontIndirect来创建，本文只设计到D3DXCreateFontIndirect，D3DXCreateFont可以参考SDK。
//D3DXCreateFontIndirect原型，发现需要D3DXFONT_DESC指针可以参考下面的原型
HRESULT WINAPI D3DXCreateFontIndirect(
LPDIRECT3DDEVICE9 pDevice,//创建的Device
CONST D3DXFONT_DESC *pDesc,
LPD3DXFONT *ppFont //返回的指针
);
//D3DXFONT_DESC 结构体原型
typedef struct D3DXFONT_DESC {
INT Height; //高
UINT Width; //宽
UINT Weight; //多粗
UINT MipLevels;
BOOL Italic; //是否斜体
BYTE CharSet;
BYTE OutputPrecision;
BYTE Quality;
BYTE PitchAndFamily;
TCHAR FaceName[LF_FACESIZE]; //文本格式，如"Times New Roman"
} D3DXFONT_DESC;
//具体例子
// 填充D3DXFONT_DESC结构体
D3DXFONT_DESC df;
ZeroMemory(&df,sizeof(D3DXFONT_DESC));
df.Height = 25;
df.Width = 12;
df.Weight = 100;
df.MipLevels = D3DX_DEFAULT;
df.Italic = false;
df.CharSet = DEFAULT_CHARSET;
df.Quality = 0;
df.PitchAndFamily = 0;
strcpy(df.FaceName,"Times New Roman");
//创建ID3DXFont 接口对象
D3DXCreateFontIndirect(g_pd3dDevice,&df,&g_font);
3.绘制文本
INT DrawText(
LPD3DXSPRITE pSprite, //null
LPCTSTR pString, //要绘制的文字
INT Count, //设为-1 null-terminated string
LPRECT pRect, //矩形
DWORD Format, //位置
D3DCOLOR Color //颜色
);
//具体例子
//居中绘制文本
RECT g_FontPosition = {0, 0, 300, 300};
g_font->DrawText(NULL,"Hello World",-1,&g_FontPosition,
DT_CENTER|DT_VCENTER,D3DCOLOR_XRGB(255,255,255));
把2，3步的代码放到BeginScene和EndScene中即可。最后不要忘记清理内存。
4.完整代码
//-----------------------------------------------------------------------------
// File: CreateDevice.cpp
//
// Desc: This is the first tutorial for using Direct3D. In this tutorial, all
// we are doing is creating a Direct3D device and using it to clear the
// window.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#include <Windows.h>
#include <mmsystem.h>
#include <d3dx9.h>
#include <string>
//-----------------------------------------------------------------------------
// Global variables
//-----------------------------------------------------------------------------
LPDIRECT3D9 g_pD3D = NULL; // Used to create the D3DDevice
LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; // Our rendering device
LPD3DXFONT g_font = NULL;
//-----------------------------------------------------------------------------
// Name: InitD3D()
// Desc: Initializes Direct3D
//-----------------------------------------------------------------------------
HRESULT InitD3D( HWND hWnd )
{
// Create the D3D object, which is needed to create the D3DDevice.
if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
return E_FAIL;
//Fill out the D3DPRESENT_PARAMETERS structure.
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory( &d3dpp, sizeof(d3dpp) );
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
// Create the Direct3D device.
if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &g_pd3dDevice ) ) )
{
return E_FAIL;
}
// Device state would normally be set here
return S_OK;
}
//-----------------------------------------------------------------------------
// Name: Cleanup()
// Desc: Releases all previously initialized objects
//-----------------------------------------------------------------------------
VOID Cleanup()
{
if( g_pd3dDevice != NULL)
g_pd3dDevice->Release();
if( g_pD3D != NULL)
g_pD3D->Release();
if(g_font != NULL)
g_font->Release();
}
//-----------------------------------------------------------------------------
// Name: Render()
// Desc: Draws the scene
//-----------------------------------------------------------------------------
VOID Render()
{
if( NULL == g_pd3dDevice )
return;
// Clear the backbuffer to a blue color
g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,255), 1.0f, 0 );
// Begin the scene
if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
{
// 填充D3DXFONT_DESC结构体
D3DXFONT_DESC df;
ZeroMemory(&df,sizeof(D3DXFONT_DESC));
df.Height = 25;
df.Width = 12;
df.Weight = 100;
df.MipLevels = D3DX_DEFAULT;
df.Italic = false;
df.CharSet = DEFAULT_CHARSET;
df.Quality = 0;
df.PitchAndFamily = 0;
strcpy(df.FaceName,"Times New Roman");
//创建ID3DXFont 接口对象
D3DXCreateFontIndirect(g_pd3dDevice,&df,&g_font);
//居中绘制文本
RECT g_FontPosition = {0, 0, 300, 300};
g_font->DrawText(NULL,"Hello World",-1,&g_FontPosition,
DT_CENTER|DT_VCENTER,D3DCOLOR_XRGB(255,255,255));
// End the scene
g_pd3dDevice->EndScene();
}
// Present the backbuffer contents to the display
g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}
//-----------------------------------------------------------------------------
// Name: MsgProc()
// Desc: The window's message handler
//-----------------------------------------------------------------------------
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
switch( msg )
{
case WM_DESTROY:
Cleanup();
PostQuitMessage( 0 );
return 0;
case WM_PAINT:
Render();
ValidateRect( hWnd, NULL );
return 0;
}
return DefWindowProc( hWnd, msg, wParam, lParam );
}
//-----------------------------------------------------------------------------
// Name: WinMain()
// Desc: The application's entry point
//-----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
// Register the window class
WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
"D3D Tutorial", NULL };
RegisterClassEx( &wc );
// Create the application's window
HWND hWnd = CreateWindow( "D3D Tutorial", "D3D Tutorial 01: CreateDevice",
WS_OVERLAPPEDWINDOW, 100, 100, 300, 300,
GetDesktopWindow(), NULL, wc.hInstance, NULL );
// Initialize Direct3D
if( SUCCEEDED( InitD3D( hWnd ) ) )
{
// Show the window
ShowWindow( hWnd, SW_SHOWDEFAULT );
UpdateWindow( hWnd );
// Enter the message loop
MSG msg;
while( GetMessage( &msg, NULL, 0, 0 ) )
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
}
UnregisterClass( "D3D Tutorial", wc.hInstance );
return 0;
}
项目下载：ID3DXFont （本站下载）
文章原地址http://www.waitingfy.com/?p=264
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