Merge pull request #3827 from PySimpleGUI/Dev-latest

Initial checkin of PIL Demo

DemoPrograms/Demo_PIL_Use.py

@@ -0,0 +1,96 @@
+import PySimpleGUI as sg
+import PIL
+from PIL import Image
+import io
+import base64
+
+"""
+    Using PIL with PySimpleGUI - for Images and Buttons
+    
+    The reason for this demo is to give you this nice PIL based function - convert_to_bytes
+    
+    This function is your gateway to using any format of image (not just PNG & GIF) and to 
+    resize / convert it so that it can be used with the Button and Image elements.
+    
+    Copyright 2020 PySimpleGUI.org
+"""
+
+def convert_to_bytes(file_or_bytes, resize=None, fill=False):
+    '''
+    Will convert into bytes and optionally resize an image that is a file or a base64 bytes object.
+    Turns into  PNG format in the process so that can be displayed by tkinter
+    :param file_or_bytes: either a string filename or a bytes base64 image object
+    :type file_or_bytes:  (Union[str, bytes])
+    :param resize:  optional new size
+    :type resize: (Tuple[int, int] or None)
+    :param fill: If True then the image is filled/padded so that the image is not distorted
+    :type fill: (bool)
+    :return: (bytes) a byte-string object
+    :rtype: (bytes)
+    '''
+    if isinstance(file_or_bytes, str):
+        img = PIL.Image.open(file_or_bytes)
+    else:
+        try:
+            img = PIL.Image.open(io.BytesIO(base64.b64decode(file_or_bytes)))
+        except Exception as e:
+            dataBytesIO = io.BytesIO(file_or_bytes)
+            img = PIL.Image.open(dataBytesIO)
+
+    cur_width, cur_height = img.size
+    if resize:
+        new_width, new_height = resize
+        scale = min(new_height / cur_height, new_width / cur_width)
+        img = img.resize((int(cur_width * scale), int(cur_height * scale)), PIL.Image.ANTIALIAS)
+    if fill:
+        img = make_square(img, THUMBNAIL_SIZE[0])
+    with io.BytesIO() as bio:
+        img.save(bio, format="PNG")
+        del img
+        return bio.getvalue()
+
+
+def make_toolbar():
+    layout = [[sg.T('❎', enable_events=True, key='Exit')]]
+    for i in range(6):
+        layout += [[sg.B(image_data = convert_to_bytes(sg._random_error_icon(), (30,30))),
+                    sg.B(image_data = convert_to_bytes(sg._random_error_icon(), (30,30)))]]
+    return sg.Window('', layout, element_padding=(0,0), margins=(0,0), finalize=True, no_titlebar=True, grab_anywhere=True)
+
+def main():
+
+    image = sg._random_error_icon()
+    size = (60,60)
+    image = convert_to_bytes(image, size)
+
+    layout =    [[sg.Button('+', size=(4,2)), sg.Button('-', size=(4,2)), sg.B('Next', size=(4,2)), sg.T(size, size=(10,1), k='-SIZE-')],
+                [sg.Image(data=image, k='-IMAGE-')],
+                [sg.Button(image_data=image, key='-BUTTON IMAGE-')],]
+
+    window = sg.Window('Window Title', layout, finalize=True)
+    toolbar = make_toolbar()
+
+    while True:             # Event Loop
+        event_window, event, values = sg.read_all_windows()
+        if event == sg.WIN_CLOSED or event == 'Exit':
+            break
+        if event == '+':
+            size = (size[0]+20, size[1]+20)
+        elif event == '-':
+            if size[0] > 20:
+                size = (size[0]-20, size[1]-20)
+        elif event in ('Next', '-BUTTON IMAGE-'):
+            image = sg._random_error_icon()
+        elif event_window == toolbar:
+            image = event_window[event].ImageData
+
+        # Resize image and update the window
+        image = convert_to_bytes(image, size)
+        window['-IMAGE-'].update(data=image)
+        window['-BUTTON IMAGE-'].update(image_data=image)
+        window['-SIZE-'].update(size)
+    window.close()
+
+
+if __name__ == '__main__':
+    main()