计算机图形学真实图形

#include

#include

/* Initialize material property, light source, lighting model,

* and depth buffer.

*/

void init(void)

{

GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };

GLfloat mat_shininess[] = { 50.0 };

GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };

GLfloat lightPos[]={0.0f,0.0f,75.0f,1.0f};

GLfloat ambientLight[]={0.0f,0.0f,75.0f,1.0f};

GLfloat specular[]={0.0f,0.0f,75.0f,1.0f};

GLfloat specref[]={0.0f,0.0f,75.0f,1.0f};

GLfloat spotDir[]={0.0f,0.0f,75.0f,1.0f};

glClearColor (0.0, 0.0, 0.0, 0.0);

glShadeModel (GL_SMOOTH);//设置阴影模型

glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);//镜面光分量强度glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);//镜面光反射指数glLightfv(GL_LIGHT0, GL_POSITION, light_position);//设置光源的位置

glLightModelfv(GL_LIGHT_MODEL_AMBIENT,ambientLight);

glLightfv(GL_LIGHT1,GL_DIFFUSE,ambientLight);

glLightfv(GL_LIGHT1,GL_SPECULAR,specular);

glLightfv(GL_LIGHT1,GL_POSITION,lightPos);

glLightf(GL_LIGHT1,GL_SPOT_CUTOFF,50.0f);

glEnable(GL_LIGHT1);

glEnable(GL_COLOR_MATERIAL);

glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE);

glMaterialfv(GL_FRONT,GL_SPECULAR,specref);

glMateriali(GL_FRONT,GL_SHININESS,128);

glEnable(GL_LIGHTING);//启动光照

glEnable(GL_LIGHT0);//激活光源

glEnable(GL_LIGHT1);//激活光源

glEnable(GL_DEPTH_TEST);

}

/* 调用glut函数绘制一个球*/

void display(void)

{

glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glutSolidSphere (1.0, 20, 16);//半径为1，20条纬线，16条经线

glFlush ();

}

/* 定义GLUT 的reshape 函数，w、h 分别是输出图形的窗口的宽和高*/

void reshape (int w, int h)//输出图形的宽高

{

glViewport (0, 0, (GLsizei) w, (GLsizei) h);

glMatrixMode (GL_PROJECTION);

glLoadIdentity();

if (w <= h)

glOrtho (-1.5, 1.5, -1.5*(GLfloat)h/(GLfloat)w,

1.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);//创建平行视景体

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();

}

void keyboard(unsigned char key, int x, int y)

{

switch (key) {

case 27:

exit(0);

break;

}

}

int main(int argc, char** argv)

{

glutInit(&argc, argv);//环境初始化

glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);//显示模式初始化glutInitWindowSize (500, 500); //定义窗口大小

glutInitWindowPosition (100, 100);//定义窗口位置

glutCreateWindow (argv[0]);//显示窗口，窗口标题为执行函数名

init ();

glutDisplayFunc(display); //注册opengl绘图函数

glutReshapeFunc(reshape);//注册窗口大小改变时的相应函数

glutKeyboardFunc(keyboard);

glutMainLoop();//进入glut消息循环，开始执行程序

return 0;

}