Python cv2.WND_PROP_VISIBLE Examples

def show(window, img):
    """
    Shows the image in OpenCV window with support for updating
    the image in real-time. This will simply repeatedly display the image.
    This makes real-time update of image possible and also lets us handle
    window close events reliably.

    Params:
    window: A python string, the name of the window in which to show the image
    img: A numpy array. Image to be shown.
    """
    while(1):  # Will repeatedly show the image in given window.
        cv2.imshow(window, img)
        k = cv2.waitKey(1) & 0xFF  # Capture the code of the pressed key.
        # Stop the loop when the user clicks on GUI close button [x].
        if not cv2.getWindowProperty(window, cv2.WND_PROP_VISIBLE):
            print("Operation Cancelled")
            break
        if k == 27:  # Key code for ESC
            break 

def imshow(img, win_name='', wait_time=0):
    """Show an image.

    Args:
        img (str or ndarray): The image to be displayed.
        win_name (str): The window name.
        wait_time (int): Value of waitKey param.
    """
    cv2.imshow(win_name, imread(img))
    if wait_time == 0:  # prevent from hangning if windows was closed
        while True:
            ret = cv2.waitKey(1)

            closed = cv2.getWindowProperty(win_name, cv2.WND_PROP_VISIBLE) < 1
            # if user closed window or if some key pressed
            if closed or ret != -1:
                break
    else:
        ret = cv2.waitKey(wait_time) 

def display_prediction(frame, frameString, fontFace=cv2.FONT_HERSHEY_SIMPLEX,
                       fontScale=1, thickness=2):

    # Display emotion
    retval, _ = cv2.getTextSize(
        frameString, fontFace, fontScale, thickness)
    cv2.rectangle(frame, (0, 0), (20 + retval[0], 50), (0, 0, 0), -1)
    cv2.putText(frame, frameString, (10, 35), fontFace, fontScale,
                (255, 255, 255), thickness, cv2.LINE_AA)

    window_name = 'EmoPy Assessment'
    cv2.imshow(window_name, frame)

    while True:

        key = cv2.waitKey(1)
        # Press Esc to exit the window
        if key == 27 or cv2.getWindowProperty(window_name, cv2.WND_PROP_VISIBLE) < 1:
            break

    # Closes all windows
    cv2.destroyAllWindows() 

def is_running(self):
        return (cv2.waitKey(1) != 27) and (cv2.getWindowProperty(self._window_name, cv2.WND_PROP_VISIBLE) >= 1) 

def map(self, data):
        image = data[self.src]

        cv2.imshow(self.window_name, image)

        # Exit?
        key = cv2.waitKey(1) & 0xFF
        # Esc key pressed or window closed?
        if key == 27 or cv2.getWindowProperty(self.window_name, cv2.WND_PROP_VISIBLE) < 1:
            raise StopIteration

        return data 

def window_closed(self, is_windows, is_conda, key):
        """ Check whether the window has been closed

        MS Windows doesn't appear to read the window state property
        properly, so we check for a negative key press.

        Conda (tested on Windows) doesn't appear to read the window
        state property or negative key press properly, so we arbitrarily
        use another property """
        # pylint: disable=no-member
        logger.trace("Commencing closed window check")
        closed = False
        prop_autosize = cv2.getWindowProperty('Frame', cv2.WND_PROP_AUTOSIZE)
        prop_visible = cv2.getWindowProperty('Frame', cv2.WND_PROP_VISIBLE)
        if self.arguments.disable_monitor:
            closed = False
        elif is_conda and prop_autosize < 1:
            closed = True
        elif is_windows and not is_conda and key == -1:
            closed = True
        elif not is_windows and not is_conda and prop_visible < 1:
            closed = True
        logger.trace("Completed closed window check. Closed is %s", closed)
        if closed:
            logger.debug("Window closed detected")
        return closed 

def window_is_open(window_name):
    return (cv2.waitKey(1) and
            cv2.getWindowProperty(window_name, cv2.WND_PROP_VISIBLE) == 1.0) 

def map(self, data):
        image = data[self.src]

        cv2.imshow(self.window_name, image)

        # Exit?
        key = cv2.waitKey(1) & 0xFF
        # Esc key pressed or window closed?
        if key == 27 or cv2.getWindowProperty(self.window_name, cv2.WND_PROP_VISIBLE) < 1:
            raise StopIteration

        return data