def main():
# setup gui
image = Image.open(IMAGE_FILE)
image_width, image_height = image.size
window_size = RectSize(width=image_width, height=image_height)
window = initialize_window(window_size)
canvas = create_canvas_on(window, window_size, canvas_place=Point(0, 0))
image_tk = ImageTk.PhotoImage(image)
canvas.create_image(0, 0, image=image_tk, anchor="nw")
def draw_rect(rectangle):
canvas.delete("rect")
draw_rect_on(
canvas,
rectangle,
fill_color="orange",
stipple="gray12",
outline_color="orange",
width=1.0,
tag="rect",
)
# state
mouse_left_click = createMouseEventStream(window, "<Button-1>")
mouse_left_drag = createMouseEventStream(window, "<B1-Motion>")
rect_begin = mouse_left_click
rect_end = rx.merge(mouse_left_drag, mouse_left_click)
rect = rx.combine_latest(rect_begin, rect_end).pipe(
ops.map(lambda tpl: rect_from_2points(*tpl)))
rect.subscribe(draw_rect)
window.mainloop()
def main():
# setup gui
image = Image.open(IMAGE_FILE)
image_width, image_height = image.size
window_size = RectSize(width=image_width, height=image_height)
window = initialize_window(window_size)
canvas = create_canvas_on(window, window_size, canvas_place=Point(0, 0))
image_tk = ImageTk.PhotoImage(image)
canvas.create_image(0, 0, image=image_tk, anchor="nw")
def draw_rect(rectangle):
canvas.delete("rect")
draw_rect_on(
canvas,
rectangle,
fill_color="orange",
stipple="gray12",
outline_color="orange",
width=1.0,
tag="rect",
)
# state
rect_begin = Point(0, 0)
rect_end = Point(0, 0)
def on_mouse_left_down(x, y):
nonlocal rect_begin, rect_end
rect_begin = Point(x, y)
rect_end = Point(x, y)
draw_rect(rect_from_2points(rect_begin, rect_end))
def on_mouse_move(x, y):
nonlocal rect_begin, rect_end
rect_end = Point(x, y)
draw_rect(rect_from_2points(rect_begin, rect_end))
window.bind("<Button-1>", lambda ev: on_mouse_left_down(ev.x, ev.y))
window.bind("<B1-Motion>", lambda ev: on_mouse_move(ev.x, ev.y))
window.mainloop()
def on_mouse_move(x, y):
nonlocal rect_begin, rect_end
rect_end = Point(x, y)
draw_rect(rect_from_2points(rect_begin, rect_end))
def on_mouse_left_down(x, y):
nonlocal rect_begin, rect_end
rect_begin = Point(x, y)
rect_end = Point(x, y)
draw_rect(rect_from_2points(rect_begin, rect_end))
def createMouseEventStream(window, event_name: str):
stream = rx.Subject()
window.bind(event_name, lambda ev: stream.on_next(Point(ev.x, ev.y)))
return stream