如何用OpenGL显示字符串

[文斌]

我在基于Windows平台的程序中使用了OpenGL的双缓冲，所以没办法利用GDI的文本输出函数。利用wglUseFontBitmaps或wglUseFontOutLines可以输出ASCII，但无法输出汉字和字符串。我的所有场景都是二维的，所以我还希望用到高效率的方法。希望高手多多指点，多谢了！

[SuperMagic]

使用矢量字库

[裕作]

gz

[文斌]

我要如何才能得到矢量字库，如何使用？能说得具体些吗？

[maplexp]

http://my.li3.net/gym/jiqiao/VC/other/77.txt


VC中OpenGL汉字显示解决方案



/// Head file
// MiscGL.h: interface for the CMiscGL class.
//
//////////////////////////////////////////////////////////////////////

#if
!defined(AFX_MISCGL_H__F7358B14_F8AC_11D3_B5AC_0080C87978F2__INCLUDED_)

#define AFX_MISCGL_H__F7358B14_F8AC_11D3_B5AC_0080C87978F2__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

////////////////////////////////////////////////////////////////////////
/////
//
// OpenGL Misc function class
//
// Copyright (C) 2000 Risker. All rights are reserved.
//
// Description:
// 1. Chinese character output.
// 2. Texture managment. (略)
//
////////////////////////////////////////////////////////////////////////
/////

class CMiscGL
{

// Implementation
public:
CMiscGL();
virtual ~CMiscGL();

static void ShowStringOutline(CString strText, HFONT = NULL);
static int ShowStringBitmap(LPCTSTR string, HFONT hFont = NULL,
BOOL bUs
eDisplayList = FALSE);
static int GetTextBitmapBox( SIZE & sizeText, LPCTSTR string,
HFONT hFon
t);
};

#endif //
!defined(AFX_MISCGL_H__F7358B14_F8AC_11D3_B5AC_0080C87978F2__INCLUDED

　

/////////////////////////////
// CCP Files
// MiscGL.cpp: implementation of the CMiscGL class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "MiscGL.h"
#include "gl/gl.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

CMiscGL::CMiscGL()
{

}

CMiscGL::~CMiscGL()
{

}

void CMiscGL::ShowStringOutline(CString strText, HFONT hFont /* = NULL
*/)
{
HDC hdc = wglGetCurrentDC();
ASSERT(hdc != NULL);

if (hFont == NULL)
{
hFont = (HFONT)::GetStockObject(SYSTEM_FONT);
}

ASSERT(hFont != NULL);
HFONT hOldFont = (HFONT)::SelectObject(hdc, hFont);

UCHAR * pChar= (UCHAR*)strText.GetBuffer(strText.GetLength());
int nListNum;
DWORD dwChar;

glPushMatrix();

for(int i = 0; i < strText.GetLength(); i++)
{
if(IsDBCSLeadByte((BYTE)pChar[i]))
{
dwChar = (WORD)((pChar[i] << 8) | pChar[i+1]);
i++;
}
else
dwChar = pChar[i];
nListNum = glGenLists(1);
GLYPHMETRICSFLOAT pgmf[1];
wglUseFontOutlines(hdc, dwChar, 1, nListNum, 0.0f, 0.1f,
WGL_FON
T_POLYGONS, pgmf);

glCallList(nListNum);
glDeleteLists(nListNum, 1);
}
glPopMatrix();

strText.ReleaseBuffer();
::SelectObject(hdc,hOldFont);
}


int CMiscGL::ShowStringBitmap(LPCTSTR lpszText,
HFONT hFont /* =
NULL */
,
BOOL
bUseDisplayList /*=
FALSE */)
{
CBitmap bitmap;
BITMAP bm;
SIZE size;
UCHAR* pBmpBits;
HFONT hOldFont;
HDC hdc = wglGetCurrentDC();

if(!hFont) // use default system font
{
hFont = (HFONT)::GetStockObject(SYSTEM_FONT);
}

hOldFont = (HFONT)SelectObject(hdc, hFont);
::GetTextExtentPoint32(hdc, lpszText, strlen(lpszText), &size);

bitmap.CreateBitmap(size.cx, size.cy, 1, 1, NULL);

HDC hMemDC = ::CreateCompatibleDC(hdc);
if(hMemDC)
{
HBITMAP hPrevBmp = (HBITMAP)SelectObject(hMemDC,
bitmap);
HFONT hPrevFont = (HFONT)SelectObject(hMemDC, hFont);

SetBkColor(hMemDC, RGB(0, 0, 0));
SetTextColor(hMemDC, RGB(255, 255, 255));
SetBkMode(hMemDC, OPAQUE);
TextOut(hMemDC, 0, 0, lpszText, strlen(lpszText));

// copy GDI bitmap to DIB
bitmap.GetBitmap(&bm);
size.cx = (bm.bmWidth + 31) & (~31);
size.cy = bm.bmHeight;
int bufsize = size.cy * (((bm.bmWidth + 31) & (~31)) /
8);
pBmpBits = new UCHAR[bufsize];
memset(pBmpBits, 0, sizeof(UCHAR)*bufsize);

struct {
BITMAPINFOHEADER bih;
RGBQUAD col[2];
}bic;
BITMAPINFO *binf = (BITMAPINFO *)&bic;

binf->bmiHeader.biSize = sizeof(binf->bmiHeader);
binf->bmiHeader.biWidth = bm.bmWidth;
binf->bmiHeader.biHeight = bm.bmHeight;
binf->bmiHeader.biPlanes = 1;
binf->bmiHeader.biBitCount = 1;
binf->bmiHeader.biCompression = BI_RGB;
binf->bmiHeader.biSizeImage = bufsize;
binf->bmiHeader.biXPelsPerMeter = 1;
binf->bmiHeader.biYPelsPerMeter = 1;
binf->bmiHeader.biClrUsed = 0;
binf->bmiHeader.biClrImportant = 0;

::GetDIBits(hdc, bitmap, 0, bm.bmHeight, pBmpBits, binf,
DIB_RGB
_COLORS);

SelectObject(hMemDC, hPrevBmp);
}
::DeleteDC(hMemDC);

// delete font from DC
SelectObject(hdc, hOldFont);

// display text
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

GLuint displist = 0;
if(bUseDisplayList)
{
displist = glGenLists(1);
glNewList(displist, GL_COMPILE);
glBitmap(size.cx, size.cy, 0.0, 2.0, size.cx+2.
0f, 0.0,p
BmpBits);
glEndList();
}
else;
glBitmap(size.cx, size.cy, 0.0, 2.0, size.cx+2.0f, 0.0,
pBmpBits
);

delete pBmpBits;

return displist;
}

int CMiscGL::GetTextBitmapBox(SIZE& sizeText, LPCTSTR string, HFONT
hFont)
{
ASSERT(hFont != NULL);

SIZE size;
HFONT hOldFont;

HDC hdc = wglGetCurrentDC();
hOldFont = (HFONT)SelectObject(hdc, hFont);
::GetTextExtentPoint32(hdc, string, strlen(string), &size);
SelectObject(hdc, hOldFont);

sizeText.cx = (size.cx + 31) & (~31);
sizeText.cy = size.cy;

return 0;
}