基于Opengl的太阳系动画实现
#include <GL\glut.h>
float fEarth = 2.0f;//地球绕太阳的旋转角度
float fMoon = 24.0f;//月球绕地球的旋转角度
void Init()
{
glEnable(GL_DEPTH_TEST);//启用深度测试
glClearColor(0.0f,0.0f,0.0f,0.8f);//背景为黑色
}
void Reshape(int width, int height)
{
if (0==height)
{
height = 1;
}
glViewport(0,0,width,height);//设置视区尺寸
glMatrixMode(GL_PROJECTION);//指定当前操作投影矩阵堆栈
glLoadIdentity();//重置投影矩阵
//指定透视投影的观察空间
gluPerspective(45.0f,(float)width/(float)height,1.0f,1000.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void Display(void)
{
//清除颜色和深度缓冲区
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//指定当前操作模型师徒矩阵堆栈
glMatrixMode(GL_MODELVIEW);
//重置模型视图矩阵
glLoadIdentity();
//图形沿Z轴负向移动
glTranslatef(0.0f,0.0f,-500.0f);
//绘制太阳
glColor3f(1.0f,0.0f,0.0f);
glutSolidSphere(50.0f,20,20);
glColor3f(0.0f,0.0f,1.0f);
//地球与太阳的黄赤交角
glRotatef(23.27,0.0,0.0,1.0);
glRotatef(fEarth,0.0f,1.0f,0.0f);
glTranslatef(200.0f,0.0f,0.0f);
//画地球
glutSolidSphere(20.0f,20,20);
glPopMatrix();
glPopMatrix();
glRotatef(6.0f,1.0f,1.0f,1.0f);
glRotatef(fMoon,0.0f,1.0f,0.0f);
glColor3f(1.0f,1.0f,0.0f);
glTranslatef(30.0f,0.0f,0.0f);
//月球
glutSolidSphere(5.0f,20,20);
glLoadIdentity();
glFlush();
glutSwapBuffers();
}
/*
在空闲时调用,动画效果
*/
void myIdle(void)
{
fEarth += 0.03f;//增加旋转步长,产生动画效果
if (fEarth>360.0f)
{
fEarth = 2.0f;
}
fMoon += 0.24f;
if (fMoon>360.0f)
{
fMoon = 24.0f;
}
Display();
}
int main(int argc,char* argv[])
{
glutInit(&argc,argv);
//窗口使用RGB色,双缓存和深度缓存
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowPosition(200,100);//窗口位置
//窗口尺寸
glutInitWindowSize(600,460);
glutCreateWindow("基于Opengl的太阳系动画");
glutReshapeFunc(Reshape);
glutDisplayFunc(Display);
glutIdleFunc(&myIdle);
Init();
glutMainLoop();//
return 0;
}
运行效果: