OpenGL编程轻松入门之二次几何体

/*声明四个二次曲面物体*/
GLUquadricObj *quadObj1;
GLUquadricObj *quadObj2;
GLUquadricObj *quadObj3;
GLUquadricObj *quadObj4;

static float light_ambient[] = {0.1,0.1,0.1,1.0};
static float light_diffuse[] = {0.5,1.0,1.0,1.0};
static float light_position[] = {90.0,90.0,150.0,0.0};

static float front_mat_shininess[] = {60.0};
static float front_mat_specular[] = {0.2,0.2,0.2,1.0};
static float front_mat_diffuse[] = {0.5,0.5,0.28,1.0};

static float back_mat_shininess[] = {60.0};
static float back_mat_specular[] = {0.5,0.5,0.2,1.0};
static float back_mat_diffuse[] = {1.0,0.9,0.2,1.0};

static float Imodel_ambient[] = {1.0,1.0,1.0,1.0};
static float Imodel_twoside[] = {GL_TRUE};
static float Imodel_oneside[] = {GL_FALSE};

void myInit(void)
{
　/*设置背景色*/
　glClearColor(1.0,1.0,1.0,1.0);

　glEnable(GL_DEPTH_TEST);
　glDepthFunc(GL_LEQUAL);

　/*设置光照*/
　glLightfv(GL_LIGHT0,GL_AMBIENT,light_ambient);
　glLightfv(GL_LIGHT0,GL_DIFFUSE,light_diffuse);
　glLightfv(GL_LIGHT0,GL_POSITION,light_position);

　/*设置材质*/
　glMaterialfv(GL_FRONT,GL_DIFFUSE,front_mat_diffuse);
　glMaterialfv(GL_FRONT,GL_SPECULAR,front_mat_specular);
　glMaterialfv(GL_FRONT,GL_SHININESS,front_mat_shininess);

　glMaterialfv(GL_BACK,GL_DIFFUSE,back_mat_diffuse);
　glMaterialfv(GL_BACK,GL_SPECULAR,back_mat_specular);
　glMaterialfv(GL_BACK,GL_SHININESS,back_mat_shininess);

　/*设置光照模型参数*/
　glLightModelfv(GL_LIGHT_MODEL_AMBIENT,Imodel_ambient);
　glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE,Imodel_twoside);

　/*激活关照*/
　glEnable(GL_LIGHTING);
　glEnable(GL_LIGHT0);
　glShadeModel(GL_SMOOTH);
}

void myDisplay(void)
{
　glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

　/*创建四个二次曲面物体*/
　quadObj1 = gluNewQuadric();
　quadObj2 = gluNewQuadric();
　quadObj3 = gluNewQuadric();
　quadObj4 = gluNewQuadric();

　/*绘制一个圆柱体*/
　glPushMatrix();
　gluQuadricDrawStyle(quadObj1,GLU_FILL);
　gluQuadricNormals(quadObj1,GL_FLAT);
　gluQuadricOrientation(quadObj1,GLU_INSIDE);
　gluQuadricTexture(quadObj1,GL_TRUE);

　glColor3f(1.0,1.0,0.0);
　glRotatef(30,1.0,0.0,0.0);
　glRotatef(40,0.0,1.0,0.0);
　gluCylinder(quadObj1,2.0,2.0,9.0,20.0,8.0);
　glPopMatrix();

　/*绘制一个球体*/
　glPushMatrix();
　gluQuadricDrawStyle(quadObj2,GLU_SILHOUETTE);
　glTranslatef(-5.0,-1.0,0.0);
　gluSphere(quadObj2,3.0,20.0,20.0);
　glPopMatrix();

　/*绘制一个圆盘*/
　glPushMatrix();
　gluQuadricDrawStyle(quadObj3,GLU_LINE);
　glTranslatef(-2.0,4.0,0.0);
　gluDisk(quadObj3,2.0,5.0,15.0,10.0);
　glPopMatrix();

　/*绘制一个部分圆盘*/
　glPushMatrix();
　gluQuadricDrawStyle(quadObj4,GLU_POINT);
　glTranslatef(-3.0,-7.0,0.0);
　gluPartialDisk(quadObj4,2.0,5.0,15.0,10.0,10.0,100.0);
　glPopMatrix();

　/*删除四个二次曲面物体对象*/
　gluDeleteQuadric(quadObj1);
　gluDeleteQuadric(quadObj2);
　gluDeleteQuadric(quadObj3);
　gluDeleteQuadric(quadObj4);
　
　glFlush();
}

void myReshape(int w,int h)
{
　glViewport(0,0,(GLsizei)w,(GLsizei)h);
　glMatrixMode(GL_PROJECTION);
　glLoadIdentity();
　gluPerspective(45.0,(GLfloat)w/(GLfloat)h,1.0,50.0);
　glMatrixMode(GL_MODELVIEW);
　glLoadIdentity();
　glTranslatef(0.0,0.0,-25.0);
}

int main(int argc,char ** argv)
{
　/*初始化*/
　glutInit(&argc,argv);
　glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);
　glutInitWindowSize(400,400);
　glutInitWindowPosition(100,100);

　/*创建窗口*/
　glutCreateWindow(" DRAW QUADRIC OBJECTS ");

　/*绘制与显示*/
　myInit();
　glutReshapeFunc(myReshape);
　glutDisplayFunc(myDisplay);

　glutMainLoop();
　return 0;
}