glfont.cpp

用opengl编写的简单贪吃蛇游戏

// GLFont.cpp: implementation of the CGLFont class.
//字体函数库
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "gl/glaux.h"
#include "glut.h"

#include "GLFont.h"

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

//////////////////////////////////////////////////////////////////////
//unsigned int Base;
//////////////////////////////////////////////////////////////////////

CGLFont::CGLFont()
{
}

CGLFont::~CGLFont()
{
}

void CGLFont::entext( float x,float y, LPCTSTR str, HFONT hFont,
					  float r, float g, float b) 
{ 	
	HDC hdc = wglGetCurrentDC();  
	SelectObject(hdc, hFont); 
	unsigned int Base = glGenLists(96);
	wglUseFontBitmaps(hdc, 32, 96,Base);
//	glDisable(GL_TEXTURE_2D); 
//	glDisable(GL_LIGHTING); 
	glPushAttrib(GL_LIST_BIT);  
	glColor3f(r,g,b);
	glRasterPos2f(x, y); 
		glListBase(Base - 32); 
		glCallLists(strlen(str), GL_UNSIGNED_BYTE, str); 
	glPopAttrib(); 
//	glEnable(GL_LIGHTING); 
//	glEnable(GL_TEXTURE_2D); 
	glDeleteLists(Base, 96); 
	glColor4f(1.0,1.0,1.0,1.0);
}

//////////////////////////////////////////////////////////////////
void CGLFont::c3dtext(LPCTSTR str,HFONT hFont,float z)
{	
	glDisable(GL_TEXTURE_2D); 
	glDisable(GL_LIGHTING);
	Printfc3d("立体汉字",hFont,z);
	glEnable(GL_LIGHTING);   
	glEnable(GL_TEXTURE_2D);
}

void CGLFont::Printfc3d(CString strText,HFONT hFont,float z)
{
	HDC hdc = wglGetCurrentDC();
	HFONT hOldFont=(HFONT)::SelectObject(hdc,hFont);
	UCHAR * pChar=(UCHAR*)strText.GetBuffer(strText.GetLength());
	int   nListNum;  
	DWORD dwChar;  
	GLYPHMETRICSFLOAT pgmf[1]; 
	glPushMatrix();   
	for(int i = 0; i < strText.GetLength(); i++){
		if(IsDBCSLeadByte((BYTE)pChar[i])){
			dwChar=(DWORD)((pChar[i]<<8)|pChar[i+1]);
			i++;
		}
		else	dwChar = pChar[i];
		nListNum = glGenLists(1);  
		wglUseFontOutlines( 
		hdc,	
		dwChar,	
		1,
		nListNum,	
		0.0f, 
		z,
		WGL_FONT_POLYGONS,
		pgmf	
		);
		glCallList(nListNum);  
		glDeleteLists(nListNum, 1);   
	}	
	glPopMatrix();    
	strText.ReleaseBuffer();
	::SelectObject(hdc,hOldFont); 
}

////////////////////////////////////////////////////////////////////////
void CGLFont:: settext (float x,float y,CString str,HFONT Font,float r,float g,float b)
  
{   
	glLoadIdentity();
	glPushAttrib(GL_CURRENT_BIT);
	glDisable(GL_TEXTURE_2D); 
	glDisable(GL_LIGHTING); 
	glColor3f(r,g,b);  
	glTranslatef(-(420-x)/800,(260-y)/600,-1.0f);
	Printftext (0,0, str,Font);    
	glEnable(GL_LIGHTING);     
	glEnable(GL_TEXTURE_2D);
	glPopAttrib();
}

void CGLFont:: Printftext (int x, int y, LPCTSTR lpszText,HFONT hFont)
{ 
	CBitmap bitmap;
	BITMAP bm;
	SIZE size; 
	HDC MDC = ::CreateCompatibleDC(0);
	SelectObject(MDC,hFont);	
	::GetTextExtentPoint32(MDC,lpszText,strlen(lpszText),&size);
	bitmap.CreateBitmap(size.cx, size.cy, 1, 1, NULL);
	HBITMAP oldBmp=(HBITMAP)SelectObject(MDC,bitmap);
	SetBkColor  (MDC, RGB(0,     0,   0));
	SetTextColor(MDC, RGB(255, 255, 255));
	TextOut(MDC, 0, 0, lpszText, strlen(lpszText));
	bitmap.GetBitmap(&bm);
	size.cx = (bm.bmWidth + 31) & (~31);
	int bufsize =size.cy * size.cx;
	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; 
	UCHAR* Bits = new UCHAR[bufsize];	
	::GetDIBits(MDC,bitmap,0,bm.bmHeight,Bits,binf,DIB_RGB_COLORS); 
                                    
	glPixelStorei(GL_UNPACK_ALIGNMENT ,1);
	glRasterPos2i(x,y); 
	glBitmap(size.cx+10,size.cy+10,0,0,0,0,Bits); 
	delete Bits;    
	SelectObject(MDC, oldBmp);  
	::DeleteDC(MDC);
}