How to colorize the outline of a canvas rectangle in Tkinter?

In Tkinter, you can colorize the outline of a canvas rectangle using the outline parameter in the create_rectangle() method. This allows you to create visually appealing rectangles with colored borders.

Syntax

canvas.create_rectangle(x1, y1, x2, y2, outline='color', width=thickness, fill='fill_color')

Parameters

The key parameters for rectangle outline customization are:

• outline − Color of the rectangle border (e.g., 'red', '#FF0000')
• width − Thickness of the outline in pixels
• fill − Interior color of the rectangle (optional)

Example

In this example, we will create a rectangle on a Tkinter canvas and apply a yellow outline with green fill ?

# Import the required libraries
from tkinter import *

# Create an instance of Tkinter Frame
win = Tk()

# Set the geometry
win.geometry("700x350")

# Define a Canvas Widget
canvas = Canvas(win, width=500, height=350)
canvas.pack()

# Create a rectangle in Canvas with colored outline
canvas.create_rectangle(100, 100, 300, 300, outline='yellow', width=4, fill='green')

win.mainloop()

Multiple Rectangles with Different Outlines

You can create multiple rectangles with different outline colors and styles ?

from tkinter import *

win = Tk()
win.geometry("700x400")

canvas = Canvas(win, width=600, height=400, bg='white')
canvas.pack()

# Rectangle with red outline
canvas.create_rectangle(50, 50, 150, 150, outline='red', width=3, fill='lightblue')

# Rectangle with blue outline
canvas.create_rectangle(200, 50, 300, 150, outline='blue', width=5, fill='lightyellow')

# Rectangle with green outline (no fill)
canvas.create_rectangle(350, 50, 450, 150, outline='green', width=2)

# Rectangle with purple outline using hex color
canvas.create_rectangle(125, 200, 275, 300, outline='#8A2BE2', width=6, fill='pink')

win.mainloop()

Key Points

• Use the outline parameter to set border color
• The width parameter controls outline thickness
• Colors can be specified as names ('red') or hex codes ('#FF0000')
• Omitting fill creates a transparent interior
• Setting outline='' removes the border entirely

Conclusion

Use the outline parameter in create_rectangle() to add colored borders to canvas rectangles. Combine with width and fill parameters for complete visual customization.