OpenGL学习三十二：二次几何体

主要包含圆柱体（Cylinder）圆盘（Disk）球（Sphere） 圆锥（Cylinder）
 
作法：
1.创建几何体对象 GLUquadricObj  *quadratic=gluNewQuadric();
2.设置几何体属性 gluQuadricNormals（法线）gluQuadricTexture（纹理）
gluQuadricOrientation（对齐方式）gluQuadricDrawStyle（绘画样式）
3.绘制二次几何体

gluQuadricNormals设置法线GLU_FLAT普通GLU_SMOOTH平滑GLU_NONEgluQuadricTextureGL_TRUE|GL_FALSE是否绑定纹理gluQuadricOrientationGLU_OUTSIDE|GLU_INSIDE设置对其方式gluQuadricDrawStyle绘画样式GLU_POINT 以点方式绘制GLU_LINE以线方式绘制GLU_FILL               100010
#define GLU_LINE                100011
#define GLU_FILL                100012
#define GLU_SILHOUETTE          100013以填充方式绘制GLU_SILHOUETTE  gluCylinder绘制圆柱体|圆锥参数2圆柱体的底面半径参数3圆柱体的顶面半径（圆锥半径为0.0）参数4圆柱体的高度参数5纬线（环绕Z轴有多少细分）参数6经线（沿着Z轴有多少细分）。细分越多该对象就越细致。gluDisk参数2盘子的内圆半径，该参数可以为0，则表示在盘子中间没孔，内圆半径越大孔越大参数3表示外圆半径，这个参数必须比内圆半径大参数4组成该盘子的切片的数量，这个数量可以想象成披萨饼中的切片的数量。切片越多，外圆边缘就越平滑参数5组成盘子的环的数量。环很像唱片上的轨迹，一环套一环。这些环从内圆半径细分到外圆半径。细分越多，速度越慢。gluSphere绘制球参数2半径参数3纬线参数4经线gluPartialDisk参数2绘制部分圆盘参数3盘子的内圆半径，该参数可以为0，则表示在盘子中间没孔，内圆半径越大孔越大参数4表示外圆半径，这个参数必须比内圆半径大参数5组成该盘子的切片的数量，这个数量可以想象成披萨饼中的切片的数量。切片越多，外圆边缘就越平滑参数6组成盘子的环的数量。环很像唱片上的轨迹，一环套一环。这些环从内圆半径细分到外圆半径。细分越多，速度越慢。参数7起始角度参数8旋转角度

#include "header.h"intpart1;intpart2;intp1=0;intp2=1;GLfloatxrot;GLfloatyrot;GLfloat xspeed;GLfloat yspeed;GLfloatz=-5.0f;GLUquadricObj *quadratic;GLfloat LightAmbient[]={ 0.5f, 0.5f, 0.5f, 1.0f };GLfloat LightDiffuse[]={ 1.0f, 1.0f, 1.0f, 1.0f };GLfloat LightPosition[]={ 0.0f, 0.0f, 2.0f, 1.0f };GLuintfilter;GLuinttexture[3];GLuint  object=0;AUX_RGBImageRec *LoadBMP(char *Filename){FILE *File=NULL;if (!Filename){return NULL;}File=fopen(Filename,"r");if (File){fclose(File);return auxDIBImageLoad(Filename);}return NULL;}int LoadGLTextures(){int Status=FALSE;AUX_RGBImageRec *TextureImage[1];memset(TextureImage,0,sizeof(void *)*1);           if (TextureImage[0]=LoadBMP("Data/Wall.bmp")){Status=TRUE;glGenTextures(3, &texture[0]);// Create Nearest Filtered TextureglBindTexture(GL_TEXTURE_2D, texture[0]);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);// Create Linear Filtered TextureglBindTexture(GL_TEXTURE_2D, texture[1]);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);// Create MipMapped TextureglBindTexture(GL_TEXTURE_2D, texture[2]);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);gluBuild2DMipmaps(GL_TEXTURE_2D, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);}if (TextureImage[0]){if (TextureImage[0]->data){free(TextureImage[0]->data);}free(TextureImage[0]);}return Status;}GLvoid ReSizeGLScene(GLsizei width, GLsizei height){if (height==0){height=1;}glViewport(0,0,width,height);glMatrixMode(GL_PROJECTION);glLoadIdentity();// Calculate The Aspect Ratio Of The WindowgluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity();}int InitGL(void){if (!LoadGLTextures()){return FALSE;}glEnable(GL_TEXTURE_2D);glShadeModel(GL_SMOOTH);glClearColor(0.0f, 0.0f, 0.0f, 0.5f);glClearDepth(1.0f);glEnable(GL_DEPTH_TEST);glDepthFunc(GL_LEQUAL);glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);glLightfv(GL_LIGHT1, GL_POSITION,LightPosition);glEnable(GL_LIGHT1);quadratic=gluNewQuadric();gluQuadricNormals(quadratic, GLU_SMOOTH);gluQuadricTexture(quadratic, GL_TRUE);return TRUE;}void glDrawCube(){glBegin(GL_QUADS);// Front FaceglNormal3f( 0.0f, 0.0f, 1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);// Back FaceglNormal3f( 0.0f, 0.0f,-1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);// Top FaceglNormal3f( 0.0f, 1.0f, 0.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);// Bottom FaceglNormal3f( 0.0f,-1.0f, 0.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);// Right FaceglNormal3f( 1.0f, 0.0f, 0.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);// Left FaceglNormal3f(-1.0f, 0.0f, 0.0f);glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);glEnd();}void DrawGLScene(void){glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glLoadIdentity();glTranslatef(0.0f,0.0f,z);glRotatef(xrot,1.0f,0.0f,0.0f);glRotatef(yrot,0.0f,1.0f,0.0f);glBindTexture(GL_TEXTURE_2D, texture[filter]);switch(object){case 0:glDrawCube();break;case 1:glTranslatef(0.0f,0.0f,-1.5f);gluCylinder(quadratic,1.0f,1.0f,3.0f,32,32);break;case 2:gluDisk(quadratic,0.5f,1.5f,32,32);break;case 3:gluSphere(quadratic,1.3f,32,32);break;case 4:glTranslatef(0.0f,0.0f,-1.5f);gluCylinder(quadratic,1.0f,0.0f,3.0f,32,32);break;case 5:part1+=p1;part2+=p2;if(part1>359){p1=0;part1=0;p2=1;part2=0;}if(part2>359){p1=1;p2=0;}gluPartialDisk(quadratic,0.5f,1.5f,32,32,part1,part2-part1);break;};xrot+=xspeed;yrot+=yspeed;glFlush();}void rotate(){glutPostRedisplay();}void keyboard(unsigned char key,int x,int y){switch (key){case 'L':glEnable(GL_LIGHTING);glutPostRedisplay();break;case 'l':glDisable(GL_LIGHTING);glutPostRedisplay();break;case ' ':object++;if(object>5)object=0;glutPostRedisplay();break;case 'F':filter+=1;if (filter>2){filter=0;}glutPostRedisplay();break;case 'W':yspeed+=0.01f;glutIdleFunc(rotate);break;case 'S':yspeed-=0.01f;glutIdleFunc(rotate);break;case 'A':xspeed+=0.01f;glutIdleFunc(rotate);break;case 'D':xspeed-=0.01f;glutIdleFunc(rotate);break;case 'Z':z-=0.01f;glutIdleFunc(rotate);break;case 'X':z+=0.01f;glutIdleFunc(rotate);break;case 'R':glutIdleFunc(NULL);break;}}int main(int argc,char **argv){glutInit(&argc,argv);glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);glutInitWindowSize(800,600);glutInitWindowPosition(100,100);glutCreateWindow("二次几何体");InitGL();glutDisplayFunc(DrawGLScene);glutKeyboardFunc(keyboard);glutReshapeFunc(ReSizeGLScene);glutMainLoop();}