OpenGL在C++中鼠标点击时获得光标坐标

Question

使用GLFW相当新颖，我希望在点击鼠标左键时将光标坐标输出到控制台上。但是，我没有得到任何输出。

static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) 
{ 
    //ESC to quit 
    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) 
    { 
     glfwSetWindowShouldClose(window, GL_TRUE); 
     return; 
    } 
    if (key == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_PRESS) 
    { 
     double xpos, ypos; 
     //getting cursor position 
     glfwGetCursorPos(window, &xpos, &ypos); 
     cout << "Cursor Position at (" << xpos << " : " << ypos << endl; 
    } 
} 

Answer 1

您正试图在键盘输入回调时获取鼠标输入。请注意，key对应的值为GLFW_KEY_*。您应该设置鼠标输入回调，而不是：

void mouse_button_callback(GLFWwindow* window, int button, int action, int mods) 
{ 
    if(button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_PRESS) 
    { 
     double xpos, ypos; 
     //getting cursor position 
     glfwGetCursorPos(window, &xpos, &ypos); 
     cout << "Cursor Position at (" << xpos << " : " << ypos << endl; 
    } 
}