OpenGL地球与太阳绕转代码

1 代码示例

#define GLUT_DISABLE_ATEXIT_HACK
#include <stdlib.h>
#include <stdio.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>

static int year=0,day=0;

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

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0,1.0,1.0);
    glPushMatrix();
    glutWireSphere(1.0,20,16);
    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();
}
void reshape(int w,int h)
{
    glViewport(0.0,0.0,(GLsizei)w,(GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0,(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;

    }
}
int main(int argc,char **argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
    glutInitWindowSize(500,500);
    glutInitWindowPosition(100,100);
    glutCreateWindow(argv[0]);
    init();
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutKeyboardFunc(keyboard);
    glutMainLoop();
    return 0;
}

2 运行结果

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