#include <highgui.h>
#include <cv.h>
#include <cxcore.h>
#include <stdio.h>

[CUT]
int mouseRect();

int main(){
    printf("Menu - Select Apps \n \n");

[CUT]
    printf("8 - Mouse Rect");
    printf("\n Your Choose: ");


    char c = getchar();

    switch (c) {
[CUT]
    case '8':
        printf("\n Mouse Rect");
        mouseRect();
        break;
    default:
        break;
    }
    return 0;
}

void my_mouse_callback(int event, int x, int y, int flags, void* param);

CvRect box;
bool drawing_box = false;

void draw_box (IplImage *img, CvRect rect) {

    cvRectangle(img, cvPoint(box.x, box.y), cvPoint(box.x+box.width, box.y+box.height), CV_RGB(0, 0, 255), 1, 8, 0);
}

// implementazione mouse callback
void my_mouse_callback(int event, int x, int y, int flags, void *param) {

    IplImage *image = (IplImage *)param;

    switch (event) {
    case CV_EVENT_MOUSEMOVE:
        if (drawing_box) {
            box.width = x - box.x;
            box.height = y - box.y;
        }
        break;
    case CV_EVENT_LBUTTONDOWN:
        drawing_box = true;
        box = cvRect(x, y, 0, 0);
        break;
    case CV_EVENT_LBUTTONUP:
        drawing_box = false;
        if(box.width < 0) {
            box.x += box.width;
            box.width *= -1;
        }
        if(box.height < 0) {
            box.y += box.height;
            box.height *= -1;
        }
        draw_box(image, box);
        break;
    }
}
int mouseRect(int argc, char** argv[]) {
    const char *name = "Mouse Box";
    box = cvRect(-1, -1, 0, 0);

    IplImage *image = cvLoadImage("/home/maurizio/openCV/aur.jpg", CV_LOAD_IMAGE_COLOR);
    cvZero(image);      // azzera img
    IplImage *temp = cvCloneImage(image);

    cvNamedWindow(name, CV_WINDOW_AUTOSIZE);

    // set up callback
    cvSetMouseCallback(name, my_mouse_callback, (void *)image);

    // main loop
    while (1){
        cvCopy(image, temp, NULL);
        if(drawing_box)
            draw_box(temp, box);
        cvShowImage(name, temp);

        if (cvWaitKey(15)==27)
            break;
    }

    cvReleaseImage(&image);
    cvReleaseImage(&temp);
    cvDestroyWindow(name);

    return 0;
}