show_pointer.py

#!/usr/bin/env python3

import tkinter as tk
from sys import platform

# Draw a circle around the pointer. Use tkinter to make circle without window.

root = tk.Tk()
#root.config(bg='')
#root.overrideredirect(True)
#root.wm_attributes("-topmost", True)
#root.wm_attributes("-transparentcolor", "white")
#root.wm_attributes("-alpha", 0.5)

# https://stackoverflow.com/questions/19080499/transparent-background-in-a-tkinter-window
if platform == "linux" or platform == "linux2":
    root.overrideredirect(True)
    root.wait_visibility(root)
    root.wm_attributes("-alpha", 0.5)
elif platform == "darwin":
    root.overrideredirect(True)
    # Make the root window always on top
    root.wm_attributes("-topmost", True)
    # Turn off the window shadow
    root.wm_attributes("-transparent", True)
    # Set the root window background color to a transparent color
    root.config(bg='systemTransparent')
    root.geometry("+300+300")
    # Store the PhotoImage to prevent early garbage collection
    root.image = tk.PhotoImage(file="photoshop-icon.gif")
    # Display the image on a label
    label = tk.Label(root, image=root.image)
    # Set the label background color to a transparent color
    label.config(bg='systemTransparent')
    label.pack()
elif platform == "win32":
    root.image = tk.PhotoImage(file='startup.gif')
    label = tk.Label(root, image=root.image, bg='white')
    root.overrideredirect(True)
    root.geometry("+250+250")
    root.lift()
    root.wm_attributes("-topmost", True)
    root.wm_attributes("-disabled", True)
    root.wm_attributes("-transparentcolor", "white")
    label.pack()


# Make the canvas fill the monitor.
canvas = tk.Canvas(root, width=root.winfo_screenwidth(), height=root.winfo_screenheight(), bg="black")

#def draw_circle(event):
#    x = event.x
#    y = event.y
#    r = 100
#    # Make a semitransparent circle.
#    canvas.create_oval(x-r, y-r, x+r, y+r, fill='red', outline='red', width=10, stipple='gray50')
#    #canvas.create_oval(x-r, y-r, x+r, y+r, fill="red", outline="red")
#    canvas.pack(fill="both", expand=True)
#canvas.bind("<Motion>", draw_circle)

# The above makes a circle on every mouse move, but they accumulate and don't go away.
# The following makes a circle on every mouse move, but it replaces the previous circle.

def draw_circle(event):
    canvas.delete("all")
    x = event.x
    y = event.y
    r = 100
    # Make a semitransparent circle.
    canvas.create_oval(x-r, y-r, x+r, y+r, fill='white', outline='white', width=10, stipple='gray50')
    #canvas.create_oval(x-r, y-r, x+r, y+r, fill="red", outline="red")
    canvas.pack(fill="both", expand=True)
canvas.bind("<Motion>", draw_circle)

# Call the draw_circle function even before the mouse is moved.
# For this, we need to generate an event with the current mouse location.
ev = tk.Event()
ev.x = root.winfo_pointerx()
ev.y = root.winfo_pointery()
draw_circle(ev)

# On click, exit.
def exit(event):
    root.destroy()
canvas.bind("<Button-1>", exit)

# Don't know what this does.
canvas.pack(fill="both", expand=True)

root.mainloop()