利用OpenGL添加AutoCAD中的平移与缩放功能
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1、添加openGL库，同过在dialog中添加picture控件来悬挂openGL视窗，悬挂方式如下：
BOOL CDemoSectionDlg::InitPic()//初始化openGL视窗{ CWnd *wnd = GetDlgItem(IDC_RENDER);//IDC_RENDER为picture控件ID hrenderDC=::GetDC(wnd->m_hWnd); //hrenderDC为类成员变量HDC hrenderDC; //设备上下文 if(SetWindowPixelFormat(hrenderDC)==FALSE) return 0; if(CreateViewGLContext(hrenderDC)==FALSE) return 0; CRect rc; wnd->GetClientRect(&rc);//rc为控件的大小。 glViewport(0, 0, (GLsizei)(rc.Width()), (GLsizei)(rc.Height())); glMatrixMode(GL_PROJECTION); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); return TRUE;}BOOL CDemoSectionDlg::CreateViewGLContext(HDC hDC) //创建view GL Context{ hrenderRC = wglCreateContext(hDC); //hrenderRC为类成员变量HGLRC hrenderRC; //渲染上下文 if(hrenderRC==NULL) return FALSE; if(wglMakeCurrent(hDC,hrenderRC)==FALSE) return FALSE; return TRUE; }BOOL CDemoSectionDlg::SetWindowPixelFormat(HDC hDC) //设定像素格式{ PIXELFORMATDESCRIPTOR pixelDesc; pixelDesc.nSize = sizeof(PIXELFORMATDESCRIPTOR); pixelDesc.nVersion = 1; pixelDesc.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_TYPE_RGBA; pixelDesc.iPixelType = PFD_TYPE_RGBA; pixelDesc.cColorBits = 32; pixelDesc.cRedBits = 0; pixelDesc.cRedShift = 0; pixelDesc.cGreenBits = 0; pixelDesc.cGreenShift = 0; pixelDesc.cBlueBits = 0; pixelDesc.cBlueShift = 0; pixelDesc.cAlphaBits = 0; pixelDesc.cAlphaShift = 0; pixelDesc.cAccumBits = 0; pixelDesc.cAccumRedBits = 0; pixelDesc.cAccumGreenBits = 0; pixelDesc.cAccumBlueBits = 0; pixelDesc.cAccumAlphaBits = 0; pixelDesc.cDepthBits = 0; pixelDesc.cStencilBits = 1; pixelDesc.cAuxBuffers = 0; pixelDesc.iLayerType = PFD_MAIN_PLANE; pixelDesc.bReserved = 0; pixelDesc.dwLayerMask = 0; pixelDesc.dwVisibleMask = 0; pixelDesc.dwDamageMask = 0; PixelFormat = ChoosePixelFormat(hDC,&pixelDesc); if(PixelFormat==0) // Choose default { PixelFormat = 1; if(DescribePixelFormat(hDC,PixelFormat, sizeof(PIXELFORMATDESCRIPTOR),&pixelDesc)==0) { return FALSE; } } if(SetPixelFormat(hDC,PixelFormat,&pixelDesc)==FALSE) { return FALSE; } return TRUE; }2、在视窗上画图，函数如下：void CDemoSectionDlg::RenderScene(double x,double y) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glScalef(ScralSize,ScralSize,0.0); xTimes = 1.4; yTimes = 0.9; xLength = 2*B01+2*B02+2*B03+B04;//H01,H02,H03,B01,B02等需要通过edit控件获取,表示各部分尺寸 yLength = H01+H02+H03; xRange = xTimes/xLength;//xLength通过相应尺寸计算出x向最大尺寸，xTimes为openGL绘图在x方向的放大倍数 yRange = yTimes/yLength;//yLength通过相应尺寸计算出y向最大尺寸，yTimes为openGL绘图在y方向的放大倍数 glTranslatef(x*1.0f,y*1.0f,0.0f); glTranslatef(-xTimes/2,yTimes/2,0); glColor3f(1.0f,1.0f,1.0f);//设置当前色为白色 glBegin(GL_LINE_LOOP); glVertex2f(0.0*xRange,0.0); glVertex2f(0.0*xRange,-H01*yRange); glVertex2f(B01*xRange,-(H01+H02)*yRange); glVertex2f(B01*xRange,-(H01+H02+H03)*yRange); glVertex2f((B01+B02+B03+B04+B03+B02)*xRange,-(H01+H02+H03)*yRange); glVertex2f((B01+B02+B03+B04+B03+B02)*xRange,-(H01+H02)*yRange); glVertex2f((B01+B02+B03+B04+B03+B02+B01)*xRange,-H01*yRange); glVertex2f((B01+B02+B03+B04+B03+B02+B01)*xRange,0.0*yRange); glEnd(); glBegin(GL_LINE_LOOP); glVertex2f((B01+B02)*xRange,-(H31+H11)*yRange); glVertex2f((B01+B02)*xRange,-(H01+H02+H03-H32-H12)*yRange); glVertex2f((B01+B02+B11)*xRange,-(H01+H02+H03-H32)*yRange); glVertex2f((B01+B02+B03-B12)*xRange,-(H01+H02+H03-H32)*yRange); glVertex2f((B01+B02+B03)*xRange,-(H01+H02+H03-H32-H22)*yRange); glVertex2f((B01+B02+B03)*xRange,-(H31+H21)*yRange); glVertex2f((B01+B02+B03-B22)*xRange,-H31*yRange); glVertex2f((B01+B02+B21)*xRange,-H31*yRange); glEnd(); glBegin(GL_LINE_LOOP); glVertex2f((B01+B02+B03+B04)*xRange,-(H31+H11)*yRange); glVertex2f((B01+B02+B03+B04)*xRange,-(H01+H02+H03-H32-H12)*yRange); glVertex2f((B01+B02+B03+B04+B11)*xRange,-(H01+H02+H03-H32)*yRange); glVertex2f((B01+B02+B03+B03+B04-B12)*xRange,-(H01+H02+H03-H32)*yRange); glVertex2f((B01+B02+B03+B03+B04)*xRange,-(H01+H02+H03-H32-H22)*yRange); glVertex2f((B01+B02+B03+B03+B04)*xRange,-(H31+H21)*yRange); glVertex2f((B01+B02+B03+B03+B04-B22)*xRange,-H31*yRange); glVertex2f((B01+B02+B03+B04+B21)*xRange,-H31*yRange); glEnd(); /////////竖向左标注///////// glColor3f(1.0f,1.0f,0.0f);//设置当前色为黄色 DrawLine(CPoint(-HLineDist,0),CPoint(-HLineDist,-H01),0,1,1); DrawLine(CPoint(-HLineDist,-H01),CPoint(-HLineDist,-(H01+H02)),0,1,1); DrawLine(CPoint(-HLineDist,-(H01+H02)),CPoint(-HLineDist,-(H01+H02+H03)),0,1,1);/////////横向下标注///////// DrawLine(CPoint(0,-(H01+H02+H03+BLineDist)),CPoint(B01,-(H01+H02+H03+BLineDist)),0,1,1); DrawLine(CPoint(B01,-(H01+H02+H03+BLineDist)),CPoint((B01+B02),-(H01+H02+H03+BLineDist)),0,1,1); DrawLine(CPoint((B01+B02),-(H01+H02+H03+BLineDist)),CPoint((B01+B02+B03),-(H01+H02+H03+BLineDist)),0,1,1); DrawLine(CPoint((B01+B02+B03),-(H01+H02+H03+BLineDist)),CPoint((B01+B02+B03+B04),-(H01+H02+H03+BLineDist)),0,1,1); DrawLine(CPoint((B01+B02+B03+B04),-(H01+H02+H03+BLineDist)),CPoint((B01+B02+B03+B04+B03),-(H01+H02+H03+BLineDist)),0,1,1); DrawLine(CPoint((B01+B02+B03+B04+B03),-(H01+H02+H03+BLineDist)),CPoint((B01+B02+B03+B04+B03+B02),-(H01+H02+H03+BLineDist)),0,1,1); DrawLine(CPoint((B01+B02+B03+B04+B03+B02),-(H01+H02+H03+BLineDist)),CPoint((B01+B02+B03+B04+B03+B02+B01),-(H01+H02+H03+BLineDist)),0,1,1); //glRasterPos2f(0.5f, 0.0f); SelectFont(15, GB2312_CHARSET, "Times New Roman"); DrawCNString("HO1",-HTxtDist,-(H01/2+7)); DrawCNString("HO2",-HTxtDist,-(H01+H02/2+7)); DrawCNString("HO3",-HTxtDist,-(H01+H02+H03/2+7)); DrawCNString("BO1",(B01/2-40),-BTxtDist); DrawCNString("BO2",(B01+B02/2-40),-BTxtDist); DrawCNString("BO3",(B01+B02+B03/2-40),-BTxtDist); DrawCNString("BO4",(B01+B02+B03+B04/2-40),-BTxtDist); DrawCNString("BO3",(B01+B02+B03+B04+B03/2-40),-BTxtDist); DrawCNString("BO2",(B01+B02+2*B03+B04+B02/2-40),-BTxtDist); DrawCNString("BO1",(B01+2*B02+2*B03+B04+B01/2-40),-BTxtDist); int B21 = 60,H11=25; DrawLine(CPoint(B01+B02+B03/2,0),CPoint(B01+B02+B03/2,-H11),0,1,1); DrawCNString("H11",B01+B02+B21,-(H11/2+7)); SwapBuffers(hrenderDC); }void CDemoSectionDlg::DrawCNString(const char* str,int x,int y) { glColor3f(0.0f, 0.0f, 1.0f); int len, i; wchar_t* wstring; HDC hDC = wglGetCurrentDC(); GLuint list = glGenLists(1); glRasterPos2f(x*xRange,y*yRange); // 计算字符的个数 // 如果是双字节字符的（比如中文字符），两个字节才算一个字符 // 否则一个字节算一个字符 len = 0; for(i=0; str[i]!='\0'; ++i) { if( IsDBCSLeadByte(str[i]) ) ++i; ++len; } // 将混合字符转化为宽字符 wstring = (wchar_t*)malloc((len+1) * sizeof(wchar_t)); MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, wstring, len); wstring[len] = L'\0'; // 逐个输出字符 for(i=0; i<len; ++i) { wglUseFontBitmapsW(hDC, wstring[i], 1, list); glCallList(list); } // 回收所有临时资源 free(wstring); glDeleteLists(list, 1); glColor3f(1.0f, 1.0f, 0.0f);}void CDemoSectionDlg::SelectFont(int size, int charset, const char* face){ HFONT hFont = CreateFontA(size, 0, 0, 0, FW_MEDIUM, 0, 0, 0, charset, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, face); HFONT hOldFont = (HFONT)SelectObject(wglGetCurrentDC(), hFont); DeleteObject(hOldFont);}void CDemoSectionDlg::DrawLine(CPoint nS,CPoint nE, BOOL IsAt,BOOL IsArrow,BOOL WithBorder){//该函数可以通过nS与nE定义带箭头标线的长度与位置来做标注，带有箭头，代码较多是因为添加了横向与竖向自动识别，//IsAt标识暂时没用，表示相对当前激活点划线还是相对坐标原点划线。//IsArrow标识是否带箭头//WithBorder标识是否带边界线 if(IsAt) { glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glEnd(); if(WithBorder&&nE.x==0) { glBegin(GL_LINES); glVertex2f((nS.x-25)*xRange,(nS.y)*yRange); glVertex2f((nS.x+25)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+nE.x-25)*xRange,(nS.y+nE.y)*yRange); glVertex2f((nS.x+nE.x+25)*xRange,(nS.y+nE.y)*yRange); glEnd(); } if(WithBorder&&nE.y==0) { glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y-25)*yRange); glVertex2f((nS.x)*xRange,(nS.y+25)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y-25)*yRange); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y+25)*yRange); glEnd(); } if(IsArrow&&(nE.x==0)) { //glVertex2f((nS.x)*xRange,(nS.y)*yRange); if(nE.y<0) { glBegin(GL_LINES); glVertex2f((nS.x+nE.x-6)*xRange,(nS.y+nE.y+18)*yRange); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glVertex2f((nS.x+nE.x+6)*xRange,(nS.y+nE.y+18)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x-6)*xRange,(nS.y-18)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x+6)*xRange,(nS.y-18)*yRange); glEnd(); } else { glBegin(GL_LINES); glVertex2f((nS.x+nE.x-6)*xRange,(nS.y+nE.y-18)*yRange); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glVertex2f((nS.x+nE.x+6)*xRange,(nS.y+nE.y-18)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x-6)*xRange,(nS.y+18)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x+6)*xRange,(nS.y+18)*yRange); glEnd(); } } if(IsArrow&&(nE.y==0)) { //glVertex2f((nS.x)*xRange,(nS.y)*yRange); if(nE.x<0) { glBegin(GL_LINES); glVertex2f((nS.x+nE.x+18)*xRange,(nS.y+nE.y+6)*yRange); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glVertex2f((nS.x+nE.x+18)*xRange,(nS.y+nE.y-6)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x-18)*xRange,(nS.y+6)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x-18)*xRange,(nS.y-6)*yRange); glEnd(); } else { glBegin(GL_LINES); glVertex2f((nS.x+nE.x-18)*xRange,(nS.y+nE.y+6)*yRange); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glVertex2f((nS.x+nE.x-18)*xRange,(nS.y+nE.y-6)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+18)*xRange,(nS.y+6)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x+18)*xRange,(nS.y-6)*yRange); glEnd(); } } } else { //glVertex2f((nS.x)*xRange,(nS.y)*yRange); //glVertex2f((nS.x+nE.x)*xRange,(nS.y+nE.y)*yRange); glBegin(GL_LINES); glVertex2f(nS.x*xRange,nS.y*yRange); glVertex2f(nE.x*xRange,nE.y*yRange); glEnd(); if(WithBorder&&(nE.x-nS.x==0)) { glBegin(GL_LINES); glVertex2f((nS.x-25)*xRange,(nS.y)*yRange); glVertex2f((nS.x+25)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nE.x-25)*xRange,(nE.y)*yRange); glVertex2f((nE.x+25)*xRange,(nE.y)*yRange); glEnd(); } if(WithBorder&&(nE.y-nS.y==0)) { glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y-25)*yRange); glVertex2f((nS.x)*xRange,(nS.y+25)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nE.x)*xRange,(nE.y-25)*yRange); glVertex2f((nE.x)*xRange,(nE.y+25)*yRange); glEnd(); } if(IsArrow&&(nE.x-nS.x==0)) { //glVertex2f((nS.x)*xRange,(nS.y)*yRange); if(nE.y-nS.y<0) { glBegin(GL_LINES); glVertex2f((nE.x-6)*xRange,(nE.y+18)*yRange); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glVertex2f((nE.x+6)*xRange,(nE.y+18)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x-6)*xRange,(nS.y-18)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x+6)*xRange,(nS.y-18)*yRange); glEnd(); } else { glBegin(GL_LINES); glVertex2f((nE.x-6)*xRange,(nE.y-18)*yRange); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glVertex2f((nE.x+6)*xRange,(nE.y-18)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x-6)*xRange,(nS.y+18)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x+6)*xRange,(nS.y+18)*yRange); glEnd(); } } if(IsArrow&&(nE.y-nS.y==0)) { //glVertex2f((nS.x)*xRange,(nS.y)*yRange); if(nE.x-nS.x<0) { glBegin(GL_LINES); glVertex2f((nE.x+18)*xRange,(nE.y+6)*yRange); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glVertex2f((nE.x+18)*xRange,(nE.y-6)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x-18)*xRange,(nS.y+6)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x-18)*xRange,(nS.y-6)*yRange); glEnd(); } else { glBegin(GL_LINES); glVertex2f((nE.x-18)*xRange,(nE.y+6)*yRange); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nE.x)*xRange,(nE.y)*yRange); glVertex2f((nE.x-18)*xRange,(nE.y-6)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x+18)*xRange,(nS.y+6)*yRange); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glEnd(); glBegin(GL_LINES); glVertex2f((nS.x)*xRange,(nS.y)*yRange); glVertex2f((nS.x+18)*xRange,(nS.y-6)*yRange); glEnd(); } } } }3、通过添加鼠标事件执行相应重绘：//需先做OnInitDialog中的初始化MouseLDStart = (0,0);MouseLDEnd = (0,0);LastPoint = (0,0);MouseLDFlag=0;CurX=0.0;CurY=0.0;LastX = 0.0;LastY = 0.0;ScralSize=1.0;//GetDlgItem(IDC_RENDER)->GetWindowRect(&PicRect); GetDlgItem(IDC_RENDER)->GetWindowRect(&rc);PicRect=rc;ScreenToClient(&rc);void CDemoSectionDlg::OnLButtonDown(UINT nFlags, CPoint point) { if((point.x>=rc.TopLeft().x)&&(point.x<=rc.BottomRight().x)&& (point.y>=rc.TopLeft().y)&&(point.y<=rc.BottomRight().y)) { MouseLDStart = point; MouseLDFlag=TRUE; } CDialog::OnLButtonDown(nFlags, point);}void CDemoSectionDlg::OnLButtonUp(UINT nFlags, CPoint point) { if(MouseLDFlag) { LastX=LastX+(point.x-MouseLDStart.x)/1.0/(PicRect.Width())*2.0/ScralSize; LastY=LastY+(MouseLDStart.y-point.y)/1.0/(PicRect.Height())*2.0/ScralSize; } MouseLDFlag=FALSE; CDialog::OnLButtonUp(nFlags, point);}void CDemoSectionDlg::OnMouseMove(UINT nFlags, CPoint point) { if(MouseLDFlag==TRUE) { CurX=LastX+(point.x-MouseLDStart.x)/1.0/(PicRect.Width())*2.0/ScralSize; CurY=LastY+(MouseLDStart.y-point.y)/1.0/(PicRect.Height())*2.0/ScralSize; RenderScene(CurX,CurY); } CDialog::OnMouseMove(nFlags, point);}BOOL CDemoSectionDlg::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt) { CPoint point = pt; ScreenToClient(&point); if((point.x>=rc.TopLeft().x)&&(point.x<=rc.BottomRight().x)&& (point.y>=rc.TopLeft().y)&&(point.y<=rc.BottomRight().y)) { if(zDelta>=0) { ScralSize=ScralSize+0.1; RenderScene(CurX,CurY); } else { ScralSize=ScralSize-0.1; RenderScene(CurX,CurY); } } return CDialog::OnMouseWheel(nFlags, zDelta, pt);}4、每次重绘需执行绘图函数，函数如2；5、最终效果如下：
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