一个极好的OpenGL汉字显示类
作者：Y___Y
联系：yinwei_88@sina.com
笔者通过各方面的资料的收集，终于写出了一个OpenGL汉字显示类（最核心的内容都是从网上和NeHe的教程上找到的，这个类实际上是从各位原创作者“集合”成的，笔者只能算一个收集整理者），很好的解决了2D，3D以及图象，图形汉字（当然也包括字母）的显示。现将其公布出来。
//GLFont.h文件#include <windows.h>#include "gl/gl.h"#pragma warning(disable:4244)//OpenGL汉字显示类class GLfont
{
HFONT hFont; COLORREF cl;public: GLfont(); virtual ~GLfont(); void SetTextColor(COLORREF textcolor);//字体颜色设置 void CreateFont(char *facename, int height, int weight, bool italic,bool underline,bool strikeout); void ShowText(int x, int y, LPCTSTR lpszText);//显示图象2D汉字 void Show2DText(char *str);//显示图形2D汉字 void Show3DText(unsigned char *str);//显示图形3D汉字
};GLfont::GLfont(){ cl=RGB(255,255,255);}GLfont::~GLfont(){ if(hFont) DeleteObject(hFont);}//只有关闭光照和纹理才能正确显示颜色void GLfont::SetTextColor(COLORREF textcolor)//字体颜色设置{ cl=textcolor;}void GLfont::CreateFont(char *facename, int height, int weight, bool italic,bool underline,bool strikeout){ LOGFONT lf; lf.lfHeight = height; lf.lfWidth = 0; lf.lfEscapement = 0; lf.lfOrientation = 0; lf.lfWeight = weight; lf.lfItalic = italic; lf.lfUnderline = underline; lf.lfStrikeOut = strikeout; lf.lfCharSet = DEFAULT_CHARSET; lf.lfOutPrecision = OUT_TT_PRECIS; lf.lfClipPrecision = CLIP_DEFAULT_PRECIS; lf.lfQuality = PROOF_QUALITY; lf.lfPitchAndFamily = VARIABLE_PITCH | TMPF_TRUETYPE | FF_MODERN; strcpy(lf.lfFaceName,facename); // 创建字体 hFont = CreateFontIndirect(&lf);}//2D图像汉字只与屏幕相联系，与具体的变换矩阵无关，也就是说不能缩放旋转。//x,y是2D图像汉字距屏幕左下角（注意不是左上角）的横向和纵向距离。void GLfont::ShowText(int x, int y, LPCTSTR lpszText){ // 保存原投影矩阵，将投影矩阵设为平行投影 glMatrixMode( GL_PROJECTION ); glPushMatrix(); glLoadIdentity(); glOrtho( 0, 640, 0, 480, -1, 1 ); // 保存原模型变换矩阵，平移至( x, y ) glMatrixMode( GL_MODELVIEW ); glPushMatrix(); glLoadIdentity(); RECT rect; GetClientRect(GetActiveWindow(),&rect); glTranslatef((float)x,(float)y,0); HBITMAP hbitmap; BITMAP bm; SIZE size; UCHAR* pBmpBits; HFONT hOldFont; HDC hdc = wglGetCurrentDC(); hOldFont = (HFONT)SelectObject(hdc, hFont); ::GetTextExtentPoint32(hdc, lpszText, strlen(lpszText), &size); hbitmap = CreateBitmap(size.cx, size.cy,1, 1, NULL); HDC hMemDC = ::CreateCompatibleDC(hdc); if(hMemDC)
{
HBITMAP hPrevBmp = (HBITMAP)SelectObject(hMemDC,hbitmap); 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)); //把GDI位图复制到DIB SelectObject(hdc,hbitmap); GetObject(hbitmap, sizeof(bm), &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, hbitmap, 0, bm.bmHeight, pBmpBits, binf,DIB_RGB_COLORS); SelectObject(hMemDC,hPrevBmp); } ::DeleteDC(hMemDC);DeleteObject( hbitmap );
SelectObject(hdc, hOldFont); //显示文字 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glColor3f(GetRValue(cl)/255.0,GetGValue(cl)/255.0,GetBValue(cl)/255.0); glRasterPos2i(x,y); glBitmap(size.cx, size.cy, 0.0, 2.0, size.cx+2.0f, 0.0, pBmpBits); delete []pBmpBits;//修改 // 恢复投影矩阵和模型变换矩阵 glMatrixMode(GL_PROJECTION); glPopMatrix(); glMatrixMode(GL_MODELVIEW); glPopMatrix(); glColor3f(1.0,1.0,1.0);}void GLfont::Show2DText(char *str){ char FTextList[255]; GLYPHMETRICSFLOAT gmf[256]; int m_iCount=strlen(str); GLuint m_listbase; HDC hDC=wglGetCurrentDC(); glPushMatrix(); SelectObject(hDC,hFont); int i=0; int j=0; int ich,cch; m_listbase = glGenLists(256); glColor3f(GetRValue(cl)/255.0,GetGValue(cl)/255.0,GetBValue(cl)/255.0); while(i<m_iCount) { if(IsDBCSLeadByte(str[i])) { //判断是否为双字节 ich=str[i]; ich=(ich<<8)+256; ////256为汉字内码“偏移量” ich=ich+str[i+1]; i++;i++; wglUseFontOutlines(hDC,//字体轮廓设备联系DC ich, //要转换为显示列表的第一个字符 1, //要转换为显示列表的字符数 m_listbase+j,//显示列表的基数 1.0f, //指定与实际轮廓的最大偏移量 0,//0.15f, //在Z轴负方向的值 WGL_FONT_POLYGONS, //指定显示列表线段或多边形 &gmf[j]); //接受字符的地址 FTextList[j]=j; j++; } else { cch=str[i]; i++; wglUseFontOutlines(hDC, //字体轮廓设备联系DC cch,//要转换为显示列表的第一个字符 1,//要转换为显示列表的字符数 m_listbase+j,//显示列表的基数 0.0f,//指定与实际轮廓的最大偏移量 0.0,//0.15f,//在Z轴负方向的值 WGL_FONT_POLYGONS, //指定显示列表线段或多边形 &gmf[j]);//接受字符的地址 FTextList[j]=j; j++; }