Question

我只是对我一直致力于在OpenGL中渲染场景的项目进行了最后的修改 - 我将其中一些基于我为Camera类编写的一些旧代码（因为我不想必须重新计算出数学！），但是之前我已将Camera类作为main.cpp的一部分包含在内，为了可重用性/清晰度，我想将它移动到它自己的单独.h / .cpp文件中/一般的良好做法。

我还用一个我编写的Mouse类替换了一个基本的Struct来保存鼠标的x和y位置。

我更改了Windows消息处理程序中的一些代码，以便在释放鼠标左键时更新相机 - 但是我收到一个奇怪的链接错误 -

1＆gt; main.obj：错误LNK2001：未解决外部符号“public：void __thiscall Camera :: moveCamera（int，int，int，int）“ （？moveCamera @ @@相机@ QAEXHHHH Z）

Windows消息处理程序中的代码是 -

    case WM_LBUTTONUP:
        Mouse.SetPos(lParam); 
        x_mouse_end = Mouse.GetXPos();
        y_mouse_end = Mouse.GetYPos(); 
        Camera.moveCamera(x_mouse_start, y_mouse_start, x_mouse_end, y_mouse_end);
        SetCamera(); 
        break;

我传递给Camera.moveCamera（）的参数是它们应该是的整数。

moveCamera（）函数如下 -

//Moves the camera based on a user dragging the mouse 
inline void Camera::moveCamera(int old_x, int old_y, int new_x, int new_y)
{
    //To store the differences between the old and new mouse positions 
    int x_difference, y_difference; 

    //If the mouse was dragged to the right, move the camera right
    if(new_x > old_x)
    {
        x_difference = new_x - old_x;
        x_difference = x_difference / 25;

        if(yaw > 350)
        {
            yaw = 0;
        }
        else
        {
            yaw = yaw + x_difference;
        }
    }

    //If the mouse was dragged to the left, move the camera left
    if(new_x < old_x)
    {
        x_difference = old_x - new_x;
        x_difference = x_difference / 25;

        if(yaw < 10)
        {
            yaw = 360;
        }
        else
        {
            yaw = yaw - x_difference;
        }
    }

    //If the mouse was dragged down, move the camera down
    if(new_y < old_y)
    {
        y_difference = new_y - old_y;
        y_difference = y_difference / 20;

        if(pitch < 10)
        {
            pitch = 360;
        }
        else
        {
            pitch = pitch - y_difference;
        }
    }

    //If the mouse was dragged up, move the camera up
    if(new_y > old_y)
    {
        y_difference = old_y - new_y;
        y_difference = y_difference / 20;
        if(pitch > 350)
        {
            pitch = 0;
        }
        else
        {
            pitch = pitch + y_difference;
        }
    }

    //Update the camera position based on the new Yaw, Pitch and Roll
    cameraUpdate();

}

“camera.h”包含在内，因为它应该是“mouse.h”，并且两个类的实例都已设置 -

Mouse Mouse;
Camera Camera;

我对可能遗漏的东西感到茫然。

如果您想了解更多信息，请与我们联系。

Answer 1

也许您已将moveCamera()的定义包含在带有“inline”关键字的.cpp文件中。这可以解释为此方法对于定义它的.cpp是本地的。请尝试删除inline。

在C ++中链接错误

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