Simple question but I'm not able to find something out there...
Is there a simple and user friendly tool that can be used within a jupyter-notebook to let the user draw something in black on a white space (let say of size (x,y) pixels) after running a cell?
The drawing has to be returned (or even temporarily saved) as an array/image which can then be used by numpy for example.
you can do that using PIL and tkinter libraries, like:
from PIL import ImageTk, Image, ImageDraw
import PIL
from tkinter import *
width = 200 # canvas width
height = 200 # canvas height
center = height//2
white = (255, 255, 255) # canvas back
def save():
# save image to hard drive
filename = "user_input.jpg"
output_image.save(filename)
def paint(event):
x1, y1 = (event.x - 1), (event.y - 1)
x2, y2 = (event.x + 1), (event.y + 1)
canvas.create_oval(x1, y1, x2, y2, fill="black",width=5)
draw.line([x1, y1, x2, y2],fill="black",width=5)
master = Tk()
# create a tkinter canvas to draw on
canvas = Canvas(master, width=width, height=height, bg='white')
canvas.pack()
# create an empty PIL image and draw object to draw on
output_image = PIL.Image.new("RGB", (width, height), white)
draw = ImageDraw.Draw(output_image)
canvas.pack(expand=YES, fill=BOTH)
canvas.bind("<B1-Motion>", paint)
# add a button to save the image
button=Button(text="save",command=save)
button.pack()
master.mainloop()
You can modify the save function to read the image using PIL and numpy to have it as an numpy array.
hope this helps!