[OpenGL]一个简单的地球月亮太阳运转模型

#include <GL/glut.h> #include <stdio.h> #include <time.h> // 太阳、地球和月亮 // 假设每个月都是12天 // 一年12个月，共是360天 static int day = 200; // day的变化：从0到359 double CalFrequency() { static int count; static double save; static clock_t last, current; double timegap; ++count; if( count <= 50 ) return save; count = 0; last = current; current = clock(); timegap = (current-last)/(double)CLK_TCK; save = 50.0/timegap; return save; } void myDisplay(void) { double FPS = CalFrequency(); printf("FPS = %f\n", FPS); glEnable(GL_DEPTH_TEST); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(75, 1, 1, 400000000); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0, -200000000, 200000000, 0, 0, 0, 0, 0, 1); // 绘制红色的“太阳” glColor3f(1.0f, 0.0f, 0.0f); glutSolidSphere(69600000, 20, 20); // 绘制蓝色的“地球” glColor3f(0.0f, 0.0f, 1.0f); glRotatef(day/360.0*360.0, 0.0f, 0.0f, -1.0f); glTranslatef(150000000, 0.0f, 0.0f); glutSolidSphere(15945000, 20, 20); // 绘制黄色的“月亮” glColor3f(1.0f, 1.0f, 0.0f); glRotatef(day/30.0*360.0 - day/360.0*360.0, 0.0f, 0.0f, -1.0f); glTranslatef(38000000, 0.0f, 0.0f); glutSolidSphere(4345000, 20, 20); glFlush(); glutSwapBuffers(); } void myIdle(void) { ++day; if( day >= 360 ) day = 0; myDisplay(); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); glutInitWindowPosition(100, 100); glutInitWindowSize(400, 400); glutCreateWindow("太阳，地球和月亮"); glutDisplayFunc(&myDisplay); glutIdleFunc(&myIdle); glutMainLoop(); return 0; }