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Python OpenCV | cv2.arrowedLine() method

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  • Last Updated : 23 Nov, 2021

OpenCV-Python is a library of Python bindings designed to solve computer vision problems. 
cv2.arrowedLine() method is used to draw arrow segment pointing from the start point to the end point.
 

Syntax: cv2.arrowedLine(image, start_point, end_point, color, thickness, line_type, shift, tipLength)
Parameters: 
image: It is the image on which line is to be drawn. 
start_point: It is the starting coordinates of line. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value). 
end_point: It is the ending coordinates of line. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value). 
color: It is the color of line to be drawn. For BGR, we pass a tuple. eg: (255, 0, 0) for blue color. 
thickness: It is the thickness of the line in px
line_type: It denotes the type of the line for drawing. 
shift: It denotes number of fractional bits in the point coordinates. 
tipLength: It denotes the length of the arrow tip in relation to the arrow length. 
Return Value: It returns an image. 
 

Image used for all the below examples: 
 

Example #1: 
 

Python3




# Python program to explain cv2.arrowedLine() method
 
# importing cv2
import cv2
 
# path
path = r'C:\Users\Atomix\Desktop\geeksforgeeks\geeks.png'
 
# Reading an image in default mode
image = cv2.imread(path)
 
# Window name in which image is displayed
window_name = 'Image'
 
# Start coordinate, here (0, 0)
# represents the top left corner of image
start_point = (0, 0)
 
# End coordinate
end_point = (200, 200)
 
# Green color in BGR
color = (0, 255, 0)
 
# Line thickness of 9 px
thickness = 9
 
# Using cv2.arrowedLine() method
# Draw a diagonal green arrow line
# with thickness of 9 px
image = cv2.arrowedLine(image, start_point, end_point,
                                     color, thickness)
 
# Displaying the image
cv2.imshow(window_name, image)

Output: 
 

Example #2: 
 

Python3




# Python program to explain cv2.arrowedLine() method
 
# importing cv2
import cv2
 
# path
path = r'C:\Users\Atomix\Desktop\geeksforgeeks\geeks.png'
 
# Reading an image in default mode
image = cv2.imread(path)
 
# Window name in which image is displayed
window_name = 'Image'
 
# Start coordinate, here (225, 0)
# represents the top right corner of image
start_point = (225, 0)
 
# End coordinate
end_point = (0, 90)
 
# Red color in BGR
color = (0, 0, 255)
 
# Line thickness of 9 px
thickness = 9
 
# Using cv2.arrowedLine() method
# Draw a red arrow line
# with thickness of 9 px and tipLength = 0.5
image = cv2.arrowedLine(image, start_point, end_point,
                    color, thickness, tipLength = 0.5)
 
# Displaying the image
cv2.imshow(window_name, image)

Output: 
 

 


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