Question

opengl做立方体旋转

这是我做得一个立方体绕y轴旋转的程序，立方体虽然显示出来了但是没有旋转这是怎么回事，望高手解答一下，十分感谢。
#include<GL/glut.h>
#include<math.h>
#include <stdlib.h>
static GLfloat thea=0.0f;
void display()
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-3.0,3.0,-3.0,4.0,1.0,10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(4,4,3,0,0,0,0,0,1);
glutWireCube(1);
glColor3f(1.0,0,0);
glRotatef(thea,0,1,0);
glFlush();
glutSwapBuffers();
}
void myIdle(void)
{
++thea;
if( thea >= 360.0f )
thea = 0.0f;
display();
}
void init()
{
glClearColor(1.0,1.0,1.0,1.0);
glColor3f(0.0,0.0,0.0);
}
int main(int argc,char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(500,500);
glutInitWindowPosition(200,200);
glutCreateWindow("cube");
init();
glutDisplayFunc(display);
glutIdleFunc(&myIdle);
glutMainLoop();
return 0;
}

Answer 1

glColor3f(0,0,1);
glTranslatef(2,0,0);
glRotatef(thea/360.0*360,0,1,0);
glutWireSphere(1,20,20);

把这几句替换你display里的函数

追问

还是不行啊，为什么要用translatef呢需要移动吗？