PIL Screenshot#

Run the tkinter canvas script, then when all is as should be take a screenshot using PIL ImageGrab.grab. The default is the entire screen, so one normally needs to define the area of the tkinter canvas in bbox. For windows machines it is better to set the option include_layered_windows=False otherwise spurious layers may intrude.

bbox is a tuple of the pixel coordinates of the left upper and right lower corners. To be certain that the containing box only includes the canvas and not the tkinter window manager decorations switch them off during the drawing build and capture using root.overrideredirect(1), then restore them.

../_images/test_circle_tk.png

The image grabbed with PIL#

Show/Hide Code test_circle_tk.py

from PIL import ImageGrab
from tkinter import Canvas,Tk

def getter(canvas):
    x=root.winfo_rootx()+canvas.winfo_x()
    y=root.winfo_rooty()+canvas.winfo_y()
    x1=x+canvas.winfo_width()*2
    y1=y+canvas.winfo_height()*2
    #print(canvas.winfo_width(),canvas.winfo_height())

    #print(x,y,x1,y1)
    ImageGrab.grab((x,y,x1,y1)).save("../../images/canvas/test_circle_tk.png")



# create circle with centre and radius
def create_circle(canvas,c,r,outline='#888888',fill='#888888'):
    return canvas.create_oval([c[0]-r,c[1]-r,c[0]+r,c[1]+r], # c[0]+r-1,c[1]+r-1],
                          outline=outline,fill=fill)

w=21*9
h=21*9
c=w//2,h//2
r=w//2

this_color = "#00A2E8"
background='white'

root=Tk()
root.geometry('300x300+0+0')
#root.update_idletasks()
root.overrideredirect(1)
canvas=Canvas(root,height=h,width=w,bd=0,highlightthickness=0,bg='red')

canvas.pack(side='right', expand='yes', fill='both')

create_circle(canvas,c,r,outline='',fill=this_color)
#print(w,h)
root.update()
#print(canvas.winfo_width(),canvas.winfo_height())
getter(canvas)

root.overrideredirect(0)
root.mainloop()

The procedure is not absolutely straightforward, and many examples on the internet capture the wrong area.

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