利用OpenGL添加AutoCAD中的平移与缩放功能.doc

利用OpenGL添加AutoCAD中的平移与缩放功能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：cpp view plain copyBOOL 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：cpp view plain copyvoid 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; stri!=0; +i) if( IsDBCSLeadByte(stri) ) +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); wstringlen = L0; / 逐个输出字符 for(i=0; ilen; +i) wglUseFontBitmapsW(hDC, wstringi, 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.y0) 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)*xRge,(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.x0) 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.y0) glBegin(GL_LINES); glVertex2f(nE.x-6)*xRange,(nE.y+18)*yRange); glVertex2f(nE.x)*xRange,(nE.y)