c++ - ¿Cómo puedo obtener la posición y dibujar un rectángulo usando opencv?

visual-studio-2012 opencv3.0

Question

Quiero obtener una posición cuando me muevo y hago clic con el mouse en el cuadro de imagen. Quiero crear un rectángulo en la ventana de la imagen cuando y donde se hace clic con el mouse.

Tengo un código simple del documento

#include "stdafx.h"
#include "opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace std;
using namespace cv;

void CallBackFunc(int event, int x, int y, int flags, void* userdata)
{
    if ( event == EVENT_LBUTTONDOWN )
    {
        cout << "Left button of the mouse is clicked - position (" << x << ", " << y << ")" << endl;    
    }
    else if( event == EVENT_RBUTTONDOWN )
    {
        cout << "Right button of the mouse is clicked - position (" << x << ", " << y << ")" << endl;
    }
    else if( event == EVENT_MBUTTONDOWN )
    {
        cout << "Middle button of the mouse is clicked - position (" << x << ", " << y << ")" << endl;
    }
    else if ( event == EVENT_MOUSEMOVE )
    {
        cout << "Mouse move over the window - position (" << x << ", " << y << ")" << endl;
    }
}

int main(int argc, char** argv)
{
    bool isDragging = false;

    // Read image from file 
    Mat img = imread("input/pic1.jpg");

    //if fail to read the image
    if( img.empty() ) 
    { 
        cout << "Error loading the image" << endl;
        return -1; 
    }

    //Create a window
    namedWindow("My Window", 1);

    //set the callback function for any mouse event
    setMouseCallback("My Window", CallBackFunc, NULL);

    //show the image
    imshow("My Window", img);

    // Wait until user press some key
    waitKey(0);

    return 0;
}

Funciona en Windows form =, pero quiero usar clics del mouse. Puse el código en la GUI. Lanza el siguiente error:

Error 3 error C3867: ''ProjectFinal :: MyForm :: CallBackFunc'': llamada a la función falta lista de argumentos; use ''& ProjectFinal :: MyForm :: CallBackFunc'' para crear un puntero al miembro c: / users / nungningz / documents / visual studio 2012 / projects / projectfinal / projectfinal / MyForm.h 690 1 ProjectFinal

Error 6 error C3867: ''ProjectFinal :: MyForm :: CallBackFunc'': llamada a la función falta lista de argumentos; use ''& ProjectFinal :: MyForm :: CallBackFunc'' para crear un puntero al miembro c: / users / nungningz / documents / visual studio 2012 / projects / projectfinal / projectfinal / MyForm.h 690 1 ProjectFinal

7 IntelliSense: un puntero a miembro no es válido para una clase administrada c: / Users / NungNingZ / Documents / Visual Studio 2012 / Projects / ProjectFinal / ProjectFinal / MyForm.h 690 37 ProjectFinal

Answer 1

Entonces tiene un problema no relacionado con su pregunta.

Sin embargo, puede lograr su objetivo utilizando solo las instalaciones de OpenCV highgui:

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace std;
using namespace cv;

vector<Rect> rects;
bool bDraw;
Rect r;
Point base;

Mat3b img;
Mat3b layer;
Mat3b working;


void CallBackFunc(int event, int x, int y, int flags, void* userdata)
{
    if ( event == EVENT_LBUTTONDOWN )
    {
        cout << "Left button of the mouse is clicked - position (" << x << ", " << y << ")" << endl;    

        // Init your rect
        base.x = x;
        base.y = y;
        r.x = x;
        r.y = y;
        r.width = 0;
        r.height = 0;
        bDraw = true;
    }        
    else if ( event == EVENT_MOUSEMOVE )
    {
        cout << "Mouse move over the window - position (" << x << ", " << y << ")" << endl;

        // If drawing, update rect width and height
        if(!bDraw) return;

        int dx = abs(r.x - x);
        int dy = abs(r.y - y);

        if(x < base.x) {
            r.x = x;
            r.width = abs(x - base.x);
        } else {
            r.width = dx;
        }

        if(y < base.y) {
            r.y = y;
            r.height = abs(y - base.y);
        } else {
            r.height = dy;
        }

        // Refresh
        working = layer.clone();
        rectangle(working, r, Scalar(0,255,0));
        imshow("My Window", working);
    }
    else if ( event == EVENT_LBUTTONUP)
    {
        cout << "Left button released" << endl;

        // Save rect, draw it on layer
        rects.push_back(r);
        rectangle(layer, r, Scalar(0,255,255));

        r = Rect(); 
        bDraw = false;

        // Refresh
        working = layer.clone();
        rectangle(working, r, Scalar(0,255,0));
        imshow("My Window", working);
    }
}

int main(int argc, char** argv)
{
    bool bDraw = false;
    bool isDragging = false;

    // Read image from file 
    img = imread("path_to_image");

    // initialize your temp images
    layer = img.clone();
    working = img.clone();

    //if fail to read the image
    if( img.empty() ) 
    { 
        cout << "Error loading the image" << endl;
        return -1; 
    }

    //Create a window
    namedWindow("My Window", 1);

    //set the callback function for any mouse event
    setMouseCallback("My Window", CallBackFunc, NULL);

    //show the image
    imshow("My Window", working);

    // Wait until user presses ''q''
    while((waitKey(1) & 0xFF) != ''q'');

    return 0;
}