OpenGL 使用鼠标进行 FPS 风格移动答案

【问题标题】：OpenGL using mouse for FPS Style movementOpenGL 使用鼠标进行 FPS 风格移动
【发布时间】：2020-12-02 04:42:11
【问题描述】：

当我运行我的程序并开始移动鼠标时，什么都没有发生。我工作得很好，但就像提到的那样，鼠标移动有问题。

我相信我的问题是它总是重置为中心但我不确定。

#define FPS 60
#define TO_RADIANS 3.14/180.0
float pitch = 0.0, yaw= 0.0;
float cX=0.0,cZ=0.0;
const int width = 16*50;
const int height = 9*50;
struct Motion
{
    bool Forward,Backward,Left,Right;
}motion = {false,false,false,false};

void init()
{
    glutSetCursor(GLUT_CURSOR_NONE);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);
    glutWarpPointer(width/2,height/2);
}

void camera()
{

    if(motion.Forward)
    {
        cX += cos((yaw+90)*TO_RADIANS)/5.0;
        cZ -= sin((yaw+90)*TO_RADIANS)/5.0;
    }
    if(motion.Backward)
    {
        cX += cos((yaw+90+180)*TO_RADIANS)/5.0;
        cZ -= sin((yaw+90+180)*TO_RADIANS)/5.0;
    }
    if(motion.Left)
    {
        cX += cos((yaw+90+90)*TO_RADIANS)/5.0;
        cZ -= sin((yaw+90+90)*TO_RADIANS)/5.0;
    }
    if(motion.Right)
    {
        cX += cos((yaw+90-90)*TO_RADIANS)/5.0;
        cZ -= sin((yaw+90-90)*TO_RADIANS)/5.0;
    }

    /*limit the values of pitch
      between -60 and 70
    */
    if(pitch>=70)
        pitch = 70;
    if(pitch<=-60)
        pitch=-60;

    glRotatef(-pitch,1.0,0.0,0.0); // Along X axis
    glRotatef(-yaw,0.0,1.0,0.0);    //Along Y axis

    glTranslatef(-cX,0.0,-cZ);
}
void timer()
{
    glutPostRedisplay();
    glutWarpPointer(width/2,height/2);
    glutTimerFunc(1000/FPS,timer,0);
}


void keyboard(unsigned char key,int x,int y)
{
    switch(key)
    {
    case 'W':
    case 'w':
        motion.Forward = true;
        break;
    case 'A':
    case 'a':
        motion.Left = true;
        break;
    case 'S':
    case 's':
        motion.Backward = true;
        break;
    case 'D':
    case 'd':
        motion.Right = true;
        break;
    }
}
void keyboard_up(unsigned char key,int x,int y)
{
    switch(key)
    {
    case 'W':
    case 'w':
        motion.Forward = false;
        break;
    case 'A':
    case 'a':
        motion.Left = false;
        break;
    case 'S':
    case 's':
        motion.Backward = false;
        break;
    case 'D':
    case 'd':
        motion.Right = false;
        break;
    }
}
int main(int argc,char**argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(width, height);
    glutCreateWindow("Jameson Marzak FPS");
    glutFullScreen();
    sky[0] = LoadTexBMP("sky0.bmp");
    sky[1] = LoadTexBMP("sky1.bmp");
    sky[2] = LoadTexBMP("grass.bmp");
    init();
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    //glutPassiveMotionFunc(passive_motion);
    glutTimerFunc(0,timer,0);    //more info about this is given below at definition of timer()
    glutKeyboardFunc(keyboard);
    glutKeyboardUpFunc(keyboard_up);

    glutMainLoop();
    return 0;
}

【问题讨论】：

我没有看到任何处理鼠标移动事件的代码，那么它应该如何移动
提示：如果您有M_PI，请使用它，而不仅仅是3.14。如果您没有它，请使用比与 Pi 相去甚远的近似值更好的近似值。
这是 2D 还是 3D ？

标签： c opengl glut

【解决方案1】：

您需要使用 glut 设置回调来处理鼠标输入： glutMouseFunc

然后，找出如何根据鼠标 x 和鼠标 y 计算适当的偏航/俯仰角，让 glut 调用您的回调

【讨论】：