Question

我目前有两个鼠标回调函数都做不同的事情

1,1,1,1,1,

第二个回调从点击窗口的点开始绘制一条线，同时鼠标左键被按下直到它被释放的点

 // 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
    }
}

如何按顺序分别调用每个函数。即首先运行onMouse Callback并运行DrawLine Callback函数

 // 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;
              }
         }

Answer 1

只需使用一个回调函数onMouse：

setMouseCallback("WinName", onMouse, 0);

然后，您可以从DrawLine致电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 )
    }
}

根据CTRL, ALT, SHIFT等修饰符，您通常会做不同的事情。

在单个opencv窗口中使用单个或多个mousecallback进行不同的鼠标操作

1 个答案: