Passing multiple parameters with the setMouseCallback function

edit savecancel

Is it possible to do?

As of know I am using the following to pass an image to the callback:

static void onMouse( int event, int x, int y, int, void* param)
{
    // Mount back the parameters
    Mat* ptrImage = (Mat*)param;

    //What to do when left button is pressed
    if( event != EVENT_LBUTTONDOWN ){
        // Draw the point on the image here!
        return;
    }
}

namedWindow("draw mask", WINDOW_AUTOSIZE);
setMouseCallback("draw mask", onMouse, (void*)&work_image);

But I would like to add a second pointer to a vector of points to keep storing them also, just don't know how to add multiple parameters. Anyone has any idea without creating global variables?