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Question

我现在有两个鼠标回调函数在一个单一的OpenCV窗口不同的鼠标操作使用单个或多个mousecallback都在做不同的东西

// Function to choose midpoint of a circle 
static void onMouse(int event, int x, int y, int, void*) 
{ 
    //Detect Mouse button event 
    if(event == EVENT_LBUTTONDOWN) 
    { 
     //store point clicked 
    } 
} 

第二回调吸引了来自一个点的直线单击窗口而上鼠标左键按住至其新版本发布

// Draws a line from the beginning of a point to another. 
// This line is the diameter of a circle 
// The first point isn't the coordinates stored by onMouse 
static void DrawLine(int event, int x, int y, int, void*) 
     { 
      switch (event) 
      { 
      case EVENT_LBUTTONDOWN: 
       // start point 
       case EVENT_LBUTTONUP: 
       //endpoint 
       break; 
       case EVENT_MOUSEMOVE: 
        if(clicked) 
        { 
        // store point 
        } 
       break; 
       default : break; 
       } 
     } 

如何调用分别各功能按顺序点。即首先运行onMouse回调和运行DrawLine的回调函数

Main() 
{ 
    setMouseCallback("WinName", onMouse, 0); 

    setMouseCallback("WinName", DrawLine, 0); 

// capture first frame of video 
    cap >> frame; 

// set midpoint when onMouse is called 

// set coordinates of the line when DrawLine is called 

    while (true) 
    { 
     cap >> frame; 

     // do the rest of your stuff here 
    } 

} 

Answer 1

只需使用一个回调函数onMouse：

setMouseCallback("WinName", onMouse, 0); 

然后，您可以拨打DrawLine从onMouse：

static void DrawLine(int event, int x, int y) 
{ 
    // Do something... 
} 

static void onMouse(int event, int x, int y, int, void*) 
{ 
    //Detect Mouse button event 
    if(SOME_CONDITION) 
    { 
     // Do something... 
    } 
    else 
    { 
     DrawLine(event, x, y) 
    } 
} 

通常你按照CTRL, ALT, SHIFT等修饰符做不同的事情。