Python Tkinter – Canvas Widget

Tkinter is a GUI toolkit used in python to make user-friendly GUIs.Tkinter is the most commonly used and the most basic GUI framework available in python. Tkinter uses an object-oriented approach to make GUIs.

Note: For more information, refer to Python GUI – tkinter

Canvas widget

The Canvas widget lets us display various graphics on the application. It can be used to draw simple shapes to complicated graphs. We can also display various kinds of custom widgets according to our needs.

Syntax:

C = Canvas(root, height, width, bd, bg, ..)

Optional parameters



  • root = root window.
  • height = height of the canvas widget.
  • width = width of the canvas widget.
  • bg = background colour for canvas.
  • bd = border of the canvas window.
  • scrollregion (w, n, e, s)tuple defined as a region for scrolling left, top, bottom and right
  • highlightcolor colour shown in the focus highlight.
  • cursor It can defind as a cursor for the canvas which can be a circle, a do, an arrow etc.
  • confine decides if canvas can be accessed outside the scroll region.
  • relief type of the border which can be SUNKEN, RAISED, GROOVE and RIDGE.

Some common drawing methods

  • Creating an Oval
     oval = C.create_oval(x0, y0, x1, y1, options)
  • Creating an arc
     arc = C.create_arc(20, 50, 190, 240, start=0, extent=110, fill="red")
  • Creating a Line
     line = C.create_line(x0, y0, x1, y1, ..., xn, yn, options)
  • Creating a polygon
     oval = C.create_polygon(x0, y0, x1, y1, ...xn, yn, options)

Example 1: Simple Shapes Drawing

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from tkinter import *
  
  
root = Tk()
  
C = Canvas(root, bg ="yellow",
           height = 250, width = 300)
  
line = C.create_line(108, 120
                     320, 40
                     fill ="green")
  
arc = C.create_arc(180, 150, 80
                   210, start = 0,
                   extent = 220
                   fill ="red")
  
oval = C.create_oval(80, 30, 140
                     150
                     fill ="blue")
  
C.pack()
top.mainloop()

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Output

python-tkinter-canvas

Example 2: Simple Paint App

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from tkinter import *
  
  
root = Tk()
  
# Create Title
root.title(  "Paint App ")
  
# specify size
root.geometry("500x350")
  
# define function when  
# mouse double click is enabled
def display( event ):
     
    # Co-ordinates.
    x1, y1, x2, y2 = ( event.x - 3 ), 
    ( event.y - 3 ), ( event.x + 3 ), 
    ( event.y + 3
      
    # Colour
    Colour = "# 000fff000" 
      
    # specify type of display
    w.create_line( x1, y1, x2, 
                  y2, fill = Colour )
  
  
# create canvas widget.
w = Canvas(root, width = 400, height = 250
  
# call function when double 
# click is enabled.
w.bind( "<B1-Motion>", paint )
  
# create label.
l = Label( root, text = "Double Click and Drag to draw." )
l.pack()
w.pack()
  
mainloop()

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Output
python-tkinter-canvas




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