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_NONE
gluQuadricTexture	GL_TRUE|GL_FALSE	是否绑定纹理
gluQuadricOrientation	GLU_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"

int		part1;			
int		part2;			
int		p1=0;				
int		p2=1;		

GLfloat	xrot;			
GLfloat	yrot;				
GLfloat xspeed;			
GLfloat yspeed;			
GLfloat	z=-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 };

GLuint	filter;				
GLuint	texture[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 Texture
		glBindTexture(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 Texture
		glBindTexture(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 Texture
		glBindTexture(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 Window
	gluPerspective(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 Face
		glNormal3f( 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 Face
		glNormal3f( 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 Face
		glNormal3f( 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 Face
		glNormal3f( 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 Face
		glNormal3f( 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 Face
		glNormal3f(-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();
}