planet.c

来自「OpenGL的大海量资料收集」· C语言 代码 · 共 117 行

#include<gl/glut.h>
#include<math.h>

static int year=0,day=0;
int w1=700,h1=700;

void init(void)
{
	glClearColor(0.0,0.0,0.0,1.0);
	glShadeModel(GL_FLAT);
}

void display(void)
{

	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0,1.0,1.0);
    
   glViewport(0,0,w1/2,h1/2);      	
	/*glBegin(GL_POLYGON);
		glVertex2f(0.0,0.0);
	    glVertex2f(0.0,2.0);
		glVertex2f(2.0,0.0);
    glEnd();
	*/
   glPushMatrix();

	//draw the sun
	glutWireSphere(1.0,20,16);


	//draw the panet
	glRotatef((GLfloat)year,0.0,1.0,0.0);
	glTranslatef(2.0,0.0,0.0);
	glRotatef((GLfloat)day,0.0,1.0,0.0);    
    glutWireSphere(0.2,10,8);

	glPopMatrix();


	//glutSwapBuffers();
	
	glViewport(w1/2,h1/2,w1/2,h1/2);      
	glPushMatrix();

	//draw the sun
	glutWireSphere(1.0,20,16);

	//draw the panet
	glRotatef((GLfloat)year,0.0,1.0,0.0);
	glTranslatef(2.0,0.0,0.0);
	glRotatef((GLfloat)day,0.0,1.0,0.0);    
    glutWireSphere(0.2,10,8);

	glPopMatrix();

    //实现动画不闪
	glutSwapBuffers();
}

void reshape(int w,int h)
{
	 
    w1=w;
	h1=h;
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(40.0,(GLfloat)w/(GLfloat)h,1.0,20.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,1.0,0.0);


}


void keyboard(unsigned char key,int x,int y)
{
	switch(key){
	case 'd':
		day=(day+10)%360;
		glutPostRedisplay();
		break;
	case 'D':
		day=(day-10)%360;
		glutPostRedisplay();
		break;
    case 'y': 
		year=(year+5)%360;
		glutPostRedisplay();
		break;
    case 'Y': 
		year=(year-5)%360;
		glutPostRedisplay();
		break;
	default:
		break;
	}
}

int main(int argc,char** argv)
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
	glutInitWindowSize(700,700);
	glutInitWindowPosition(0,0);
	glutCreateWindow(argv[0]);
	init();
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);
	glutKeyboardFunc(keyboard);
	glutMainLoop();
	return 0;
}