import tkshow as tks

def main():
    """main application code goes here"""

    # ...
    # get image from from somewhere
    img = ...

    # draw some overlays
    gcl = tks.GraphicsCmdList()
    gcl.rectangle( 20, 40, 40, 60, outline="black", fill="blue" )
    gcl.marker( [20,20,40,40], [40,60,40,60], symbol="v", size = 4, fill="red", alpha=0.3 )

    # show everything in tkshow window
    tw = tks.create_window()
    tw.set_image( img )
    tw.set_gcl( gcl )

    # do something else or wait until the window is closed:
    tks.tk_main_thread().join()


if __name__ == "__main__":
    tks.tk_init( main_func=main )

import tkshow as tks

def img_iter():
    while True:
        # get image from from somewhere
        img = ...

        # draw some overlays
        gcl = tks.GraphicsCmdList()
        gcl.rectangle( ... )
        gcl.marker( ... )

        yield (img,gcl)

def main():
    """main application code goes here"""
    tks.show_sequence( img_iter )

if __name__ == "__main__":
    tks.tk_init( main_func=main )

import tkshow as tks

def get_image(idx : int):
    
    # get image with index "idx"
    img = ...

    # draw some overlays for "idx"
    gcl = tks.GraphicsCmdList()
    gcl.rectangle( ... )
    gcl.marker( ... )

    return (img,gcl)

def main():
    """main application code goes here"""
    tks.show_sequence( get_image, max_idx=<number of images>-1 )

if __name__ == "__main__":
    tks.tk_init( main_func=main )