Tkinter Canvas
The Canvas is a rectangular area intended for drawing
pictures or other complex layouts.
You can place graphics, text, widgets or frames on a
Canvas.
Syntax
Here is the simple syntax to create this widget
w=
Canvas ( master, option=value, ... )
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Parameters
- master: This represents the parent window.
- options: Here is the list of most commonly used
options for this widget. These
options can be used as
key-value pairs separated by commas.
Option
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Description
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bd
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Border width in pixels. Default is 2.
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bg
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Normal background color.
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confine
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If true (the default), the canvas cannot be
scrolled outside of the scrollregion.
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cursor
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Cursor used in the canvas like arrow,
circle, dot etc.
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height
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Size of the canvas in the Y dimension.
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highlightcolor
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Color shown in the focus highlight.
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relief
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Relief specifies the type of the border. Some
of the values are SUNKEN, RAISED, GROOVE, and RIDGE.
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scrollregion
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A tuple (w, n, e, s) that defines over how
large an area the canvas can be scrolled, where w is the left side, n the
top, e the right side, and s the bottom.
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width
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Size of the canvas in the X dimension.
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xscrollincrement
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If you set this option to some positive
dimension, the canvas can be positioned only on multiples of that distance,
and the value will be used for scrolling by scrolling units, such as when the
user clicks on the arrows at the ends of a scrollbar.
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yscrollincrement
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Works like xscrollincrement, but governs
vertical movement.
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yscrollcommand
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If the canvas is scrollable, this attribute
should be the .set( ) method of the vertical scrollbar.
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The Canvas widget can support the
following standard items
arc. Creates an arc item, which can be
a chord, a pieslice or a simple arc.
coord = 10, 50, 240, 210
arc = canvas.create_arc(coord, start=0, extent=150,
fill="blue")
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image . Creates an image item, which can
be an instance of either the BitmapImage or
the PhotoImage classes.
filename = PhotoImage(file = "sunshine.gif")
image = canvas.create_image(50, 50, anchor=NE, image=filename)
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line . Creates a line item.
line = canvas.create_line(x0, y0, x1, y1, ..., xn, yn, options)
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oval . Creates a circle or an ellipse at
the given coordinates. It takes two pairs of
coordinates; the top left and bottom right
corners of the bounding rectangle for the oval.
oval = canvas.create_oval(x0, y0, x1, y1, options)
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polygon . Creates a polygon item that must
have at least three vertices.
oval = canvas.create_polygon(x0, y0, x1, y1,...xn, yn, options)
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Example
code :
# !/usr/bin/python3
from tkinter import *
from tkinter import messagebox
top = Tk()
C = Canvas(top, bg="blue", height=250, width=300)
coord = 10, 50, 240, 210
arc = C.create_arc(coord, start=0, extent=150, fill="red")
line = C.create_line(10,10,200,200,fill='white')
C.pack()
Top.mainloop()
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