v2.7.0

This release contains bug fixes and the addition of a pure Python implementation of cvui, i.e. cvui.py. The Python port of cvui has been conceived and developed with the aim of achieving a 1-to-1 match regarding the already existing C++ API. As a consequence, functions and parameters names were kept the same, so existing C++ documentation should apply to Python with minor changes.

cvui.py also aims to be a "header-only" file, so all you have to do is add it to your project and you are good to go. Here is a simple example of the Python usage of cvui:

import numpy as np
import cv2
import cvui

WINDOW_NAME = 'CVUI Test'

cvui.init(WINDOW_NAME)

# Create a frame
frame = np.zeros((200, 400, 3), np.uint8)

while True:
    # clear the frame
    frame[:] = (49, 52, 49)

    # render a message in the frame at position (10, 15)
    # then show it on the screen
    cvui.text(frame, 10, 15, 'Hello world!')
    cvui.imshow(WINDOW_NAME, frame)

    if cv2.waitKey(20) == 27:
        break

All code examples are now also available in Python. The C++ version of cvui makes heavy use of param overloading, which is a problem in Python. To ensure good documentation and proper code auto-completion for cvui in Python IDEs, cvui.py has several dummy/wrapping functions. They have a proper list of arguments instead of a single *args param. It should provide a good user experience without causing any problems.

Finally, I would like to highlight the addition of new code examples, particularly the ui-enhanced-* ones. They show how to improve existing cvui components, e.g. make a window movable and minimizable. Documentation pages have also been tweaked to accommodate information regarding the newly added Python support.

Below is a list of changes according to the CHANGELOG. Thank you to all contributors that have helped improve cvui!

Added

• Python implementation of cvui, i.e. cvui.py (read more)
• Python examples ported from the already existing C++ ones.
• New ui-enhanced-* examples, e.g. moving settings window (#41, #36, help from Amaury Bréhéret and ShengYu).
• Cmake option ADD_PYTHON_EXAMPLES to control the build of Python examples (read more).

Changed

• Documentation tweaks (help from ShengYu and Akash Kumar Singh).
• Cmake version 3.1 or higher is now required to build the examples.
• Cmake files were improved.
• rect() color filling now supports alpha values, e.g. 0x7700ff00 (blue with 50% transparency) (#39, help from Justin Muncaster).

Fixed

• rect() issue related to opacity (#42, help from Justin Muncaster).
• Conflict with dirent.h and min()/max() macros on Windows (#38, help from Ali Zarei).