145上位机VC MFC使用OPenGL绘制三维NURBS曲线
145上位机VC MFC使用OPenGL绘制三维NURBS曲线
功能展示
OPenGL可以很方便的绘制三维方面的动画，我们当前使用实现OPenGL环境的初始化，并绘制一个 三维NURBS曲线，效果如图； 要点提示 使用OPENGL前得向工程加载它的静态文件及所在的头文件，通过 我们例程中几行代码便可#include"gl\gl.h“ #include "gl\glu.h“ #include "gl\glaux.h"#pragmacomment(lib,"opengl32.lib")#pragmacomment(lib,"glu32.lib") #pragma comment(lib,"glaux.lib")
另外窗口得具备属性WS_CLIPSIBLINGS |WS_CLIPCHILDREN才能更好显示效果； 绘制三维NURBS曲线主要用到函数有：gluBeginSurface()gluNurbsSurface() gluEndSurface()；gluNewNurbsRenderer()生成对象；
实现功能 1.新建基于对话框的应用程序 2.初始化OPENGL环境，在主对话框头文件添加#include "gl\gl.h" #include "gl\glu.h“ #include"gl\glaux.h"#pragma comment(lib,"opengl32.lib") #pragma comment(lib,"glu32.lib") #pragmacomment(lib,"glaux.lib")
3.添加变量HGLRC m_hOpenglRC; 变量在OnInitDialog()初始化，在OnDestroy()销毁 - ModifyStyle(0,WS_CLIPSIBLINGS | WS_CLIPCHILDREN,0);//设置窗口属性；
- static PIXELFORMATDESCRIPTOR pfd =
- {
- sizeof(PIXELFORMATDESCRIPTOR), //
- 1, //
- PFD_DRAW_TO_WINDOW| //
- PFD_SUPPORT_OPENGL| //
- PFD_DOUBLEBUFFER, //
- PFD_TYPE_RGBA, //
- 24, //
- 0, 0, 0, 0, 0, 0, //
- 0, //
- 0, //
- 0, //
- 0, 0, 0, 0, 16, //
- 0, 0, //
- PFD_MAIN_PLANE, //
- 0, //
- 0, 0, 0 //
- };
-
- int pixelformat=::ChoosePixelFormat(GetDC()->m_hDC,&pfd);
- if(pixelformat==0)
- {
- AfxMessageBox("初始化失败");
- return -1;
- }
- SetPixelFormat(GetDC()->m_hDC,pixelformat,&pfd);
- m_hOpenglRC=wglCreateContext(GetDC()->m_hDC);
- wglMakeCurrent(GetDC()->m_hDC,m_hOpenglRC);
- void CGkbc8Dlg::OnDestroy()
- {
- wglDeleteContext(m_hOpenglRC);
- CDialog::OnDestroy();
- <div style="text-align: center;"><span style="line-height: 1.5;"><font size="4">}</font></span></div>
在OnPaint()函数中绘制在OnSize()调整大小 - void CGkbc8Dlg::OnSize(UINT nType, int cx, int cy)
- {
- CDialog::OnSize(nType, cx, cy);
-
- if ( 0 >= cx || 0 >= cy )
- {
- return;
- }
- ::glViewport(0,0,cx,cy);
- ::glMatrixMode(GL_PROJECTION);
- ::glLoadIdentity();
- GLdouble dblaspect = (GLdouble)cx/(GLdouble)cy;
- ::gluPerspective(40.0f,dblaspect,.1f, 20.0f);
- ::glMatrixMode(GL_MODELVIEW);
- ::glLoadIdentity();
- ::glTranslatef(0.0f,0.0f,-5.0f);
- ::glRotatef(20.0f, 1.0f, 0.0f, 0.0f);
- }
- //<>
- GLUnurbsObj *nurb;
- GLfloat point[4][4][3];
- GLfloat diffuse[]={0.88,0.66,0.22,1.0};
- GLfloat specular[]={0.92,0.9,0.0,1.0};
- GLfloat shininess[]={80.0};
-
- glClearColor(0.0,0.0,0.0,1.0);
- glMaterialfv(GL_FRONT,GL_DIFFUSE,diffuse);
- glMaterialfv(GL_FRONT,GL_SPECULAR,specular);
- glMaterialfv(GL_FRONT,GL_SHININESS,shininess);
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glDepthFunc(GL_LESS);
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_AUTO_NORMAL);
- glEnable(GL_NORMALIZE);
- nt u, v;
- for (u=0;u<4;u++)
- {
- for(v=0;v<4;v++)
- {
- point[u][v][0]=2.0*((GLfloat)u-1.5);
- point[u][v][1]=2.0*((GLfloat)v-1.5);
-
- if((u==1||u==2)&&(v==1||v==2))
- point[u][v][2]=3.0;
- else
- point[u][v][2]=-3.0;
- }
- }
- nurb=gluNewNurbsRenderer();
- gluNurbsProperty(nurb,GLU_SAMPLING_TOLERANCE,25.0);
- gluNurbsProperty(nurb,GLU_DISPLAY_MODE,GLU_FILL);
- GLfloat knots[8]={0.0,0.0,0.0,0.0,1.0,1.0,1.0,1.0};
- glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
-
- glPushMatrix();
- glRotatef(330.0,1.0,0.0,0.0);
- glScalef(0.5,0.5,0.5);
-
- gluBeginSurface(nurb);
- gluNurbsSurface(nurb,
- 8,
- knots,
- 8,
- knots,
- 4*3,
- 3,
- &point[0][0][0],
- 4,4,
- GL_MAP2_VERTEX_3);
- gluEndSurface(nurb);
-
- glPopMatrix();
- glFlush();
- if(FALSE==::SwapBuffers(GetDC()->m_hDC))
- AfxMessageBox("交换缓冲区失败");
我们来演示下功能实现的整个过程
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