OpenGl.rar_opengl 圆柱_opengl圆柱_opengl绘制圆柱_圆柱_绘制圆柱

//////////////////////////////////////////////////////////////////////////////////////////// //Cylinder.cpp #include "stdafx.h" #pragma warning(disable : 4136) //X86 #define Y 2.0 //圆柱高度 int recursion_depth=4;//递归深度 static GLdouble vrtx[8][3]={ //bottom { 1.0, 0.0, 0.0},//0 { 0.0, 0.0,-1.0},//1 {-1.0, 0.0, 0.0},//2 { 0.0, 0.0, 1.0},//3 //top { 1.0, Y, 0.0}, //4 { 0.0, Y,-1.0}, //5 {-1.0, Y, 0.0}, //6 { 0.0, Y, 1.0}, //7 }; static GLuint quads[4][4]={ {0,1,5,4},{1,2,6,5},{2,3,7,6},{3,0,4,7} }; void normalize(double v[3],BOOL b3D){//向量归一化 if(b3D){//在三维空间内对v进行归一化 GLfloat d=(GLfloat)sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]);//求出向量V的模 if(d==0.0){ MessageBox(NULL,"向量的模为零！！程序将退出！！","圆柱演示",MB_OK|MB_ICONERROR); exit(0); } v[0]/=d;v[1]/=d;v[2]/=d; } else{//在XOZ平面内把向量归一化 GLfloat d=(GLfloat)sqrt(v[0]*v[0]+v[2]*v[2]); if(d==0.0){ MessageBox(NULL,"向量的模为零！！程序将退出！！","圆柱演示",MB_OK|MB_ICONERROR); exit(0); } v[0]/=d;v[2]/=d; } } void drawSurface(double *V1,double *V2,double *V3,double *V4){ glBegin(GL_POLYGON); glNormal3dv(V1); glVertex3dv(V1); glNormal3dv(V2); glVertex3dv(V2); glNormal3dv(V2); glVertex3dv(V3); glNormal3dv(V1); glVertex3dv(V4); glEnd(); glBegin(GL_TRIANGLES);//上表面 glNormal3d(0.0,1.0,0.0);//上法线方向 glVertex3dv(V3); glNormal3d(0.0,1.0,0.0);//上法线方向 glVertex3d(0.0,Y,0.0); //上底圆心 glNormal3d(0.0,1.0,0.0);//上法线方向 glVertex3dv(V4); glEnd(); //因为下底面不接受光照，所以完全可以不绘制下底面以加快速度 /* glBegin(GL_TRIANGLES);//下底面 glNormal3d(0.0,-1.0,0.0);//下法线方向 glVertex3dv(V2); glNormal3d(0.0,-1.0,0.0);//下法线方向 glVertex3d(0.0,0.0,0.0); //下底圆心 glNormal3d(0.0,-1.0,0.0);//下法线方向 glVertex3dv(V1); glEnd(); */ } void subDivide(double *bottomV1,double *bottomV2,double *topV2,double *topV1,int depth){ GLdouble topV12[3],bottomV12[3]; if(depth==0){ drawSurface(bottomV1,bottomV2,topV2,topV1); return; } for(int i=0;i<3;i++){ bottomV12[i]=(bottomV1[i]+bottomV2[i])/2.0; topV12[i]=(topV1[i]+topV2[i])/2.0; } normalize(topV12,false);//在XOZ平面内对topV12向量进行归一化 normalize(bottomV12,false); subDivide(bottomV1,bottomV12,topV12,topV1,depth-1); subDivide(bottomV12,bottomV2,topV2,topV12,depth-1); } //初始化光照模型及视图模型转换设置后开始实际的绘图 void _stdcall display (void){ // glClearColor(1.0,0.0,1.0,1.0); //设置背景颜色 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); //设置背景颜色 glColor3f(1.0,1.0,0.0);//设置绘制图形所用颜色 //设置图形转换信息 glLoadIdentity(); //清空矩阵 glTranslatef(0.0,-1.0,-5.0); //把圆柱体向Y负方向平移1单位，向Z负方向平移5单位 glRotatef(15.0,1.0,0.0,0.0); //把圆柱体绕X轴旋转15° //开始具体绘制图形 for(int i=0;i<4;i++){ subDivide( &vrtx[quads[i][0]] [0], &vrtx[quads[i][1]] [0], &vrtx[quads[i][2]] [0], &vrtx[quads[i][3]] [0], recursion_depth ); } glFlush();//结束图形绘制的顶点给定，并最终输出至显示器完成图形的显示 } void myInit (void){ GLfloat mtrxAmbient[] = {0.8,0.8,0.8,1.0}; GLfloat mtrxSpecular[] = {1.0,1.0,1.0,1.0}; GLfloat mtrxShininess[] = {70.0}; GLfloat light_position[] = {1.0,1.0,1.0,0.0}; GLfloat white_light[] = {1.0,1.0,1.0,0.0}; glClearColor(0.0,0.0,0.0,0.0); glShadeModel(GL_SMOOTH); //设置明暗模型为平直 //定义材质 glMaterialfv(GL_FRONT,GL_SPECULAR,mtrxSpecular); glMaterialfv(GL_FRONT, GL_SHININESS, mtrxShininess); //打开光照 glLightModelfv(GL_LIGHT_MODEL_AMBIENT,mtrxAmbient);//定义全局环境光 glLightfv(GL_LIGHT0, GL_POSITION, light_position); glLightfv(GL_LIGHT0, GL_DIFFUSE, white_light); glLightfv(GL_LIGHT0, GL_SPECULAR, white_light); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); } //初始化光照模型及视图模型转换设置 void _stdcall myReshape(int w,int h){ glViewport(0,0,(GLsizei)w,(GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity();/* define the projection */ if(w<=h)//保证视口区不成比例缩放时,图形保持原比例不变 glOrtho(-1.5,1.5,-1.5*(GLfloat)h/(GLfloat)w,1.5*(GLfloat)h/(GLfloat)w,-10.0,10.0); else glOrtho(-1.5*(GLfloat)w/(GLfloat)h,1.5*(GLfloat)w/(GLfloat)h,-1.5,1.5,-10.0,10.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } //主函数 int main(int argc,char* argv[]){ auxInitDisplayMode(AUX_SINGLE|AUX_RGBA|AUX_DEPTH16); auxInitPosition(0,0,500,500); auxInitWindow("递归法离散圆柱体演示程序"); myInit(); auxReshapeFunc(myReshape); auxMainLoop(display); return 0; }