glutWarpPointer在应用程序处于活动状态时不工作

Question

我的问题是当我的鼠标在屏幕中时，屏幕将不再旋转。只有当应用程序不再处于活动状态时。

（视频显示发生了什么：http://youtu.be/h5Sg3nQoWKs）

，如果我拿出这些经指针然后它开始再次合作。

这里是我的鼠标更新：

mouse.x = x; 
mouse.y = y; 

if (x > screen.x/2) 
{ 
    player.angle -= 0.05f; 
    player.lx = sin(player.angle); 
    player.lz = -cos(player.angle); 
    glutWarpPointer(screen.x/2,screen.y/2); 
} 
else if (x < screen.x/2) 
{ 
    player.angle += 0.05f; 
    //if (player.vertAngle < 0) 
     //player.vertAngle = 0; 
    player.lx = sin(player.angle); 
    player.lz = -cos(player.angle); 
    glutWarpPointer(screen.x/2,screen.y/2); 
} 
if (y < screen.y/2) 
{ 
    player.vertAngle += 0.05f; 
    player.ly = sin(player.vertAngle); 
    glutWarpPointer(screen.x/2,screen.y/2); 
} 
else if (y > screen.y/2) 
{ 
    player.vertAngle -= 0.05f; 
    //if (player.vertAngle > 360) 
     //player.vertAngle = 360; 
    player.ly = sin(player.vertAngle); 
    glutWarpPointer(screen.x/2,screen.y/2); 
} 

Answer 1

使用一个标志，忽略额外的运动事件glutWarpPointer()生成：

#include <GL/glut.h> 

#include <iostream> 
using namespace std; 

bool capture = false; 
void keyboard(unsigned char key, int x, int y) 
{ 
    if(key == 'z') 
    { 
     capture = !capture; 
    } 
} 

void passiveMotion(int x, int y) 
{ 
    static bool warped = false; 
    if(warped) 
    { 
     warped = false; 
     return; 
    } 

    if(capture) 
    { 
     warped = true; 
     int w = glutGet(GLUT_WINDOW_WIDTH); 
     int h = glutGet(GLUT_WINDOW_HEIGHT); 
     glutWarpPointer(w/2, h/2); 

     int dx = (w/2) - x; 
     int dy = (h/2) - y; 
     cout << dx << " " << dy << endl; 
    } 
    else 
    { 
     cout << x << " " << y << endl; 
    } 
} 

void display() 
{ 
    glClear(GL_COLOR_BUFFER_BIT); 
    glutSwapBuffers(); 
} 

int main(int argc, char **argv) 
{ 
    glutInit(&argc, argv); 
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE); 
    glutInitWindowSize(640, 480); 
    glutCreateWindow("GLUT"); 
    glutKeyboardFunc(keyboard); 
    glutPassiveMotionFunc(passiveMotion); 
    glutDisplayFunc(display); 
    glutMainLoop(); 
    return 0; 
}