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Nodejs | GM roll() Function

  • Last Updated : 03 Aug, 2021

The roll() function is an inbuilt function in the GraphicsMagick library which is used to roll an image vertically or horizontally. The function returns the true value on success.

Syntax: 

roll( x, y )

Parameters: This function accepts two parameters as mentioned above and described below: 

  • x: This parameter is used to specify the value of horizontal roll.
  • y: This parameter is used to specify the value of vertical roll.

Return Value: This function returns the GraphicsMagick object.

Example 1: 



Javascript




// Include gm library
var gm = require('gm');
 
// Import the image
gm('1.png')
 
// Invoke roll function with 60, 60
.roll(60, 60)
 
// Process and Write the image
.write("roll1.png", function (err) {
  if (!err) console.log('done');
});

Output: 

Example 2:  

Javascript




// Include gm library
var gm = require('gm');
 
//Import the image
gm(600, 300, 'white')
 
// set the color for the stroke
.stroke("green", 3)
 
// Set the font
.font("Helvetica.ttf", 60)
 
//Call to drawText Function
.drawText(100, 280, "GeeksforGeeks!")
 
// Invoke roll function
.roll(300, 150)
 
// Process and write the image
.write("roll2.png", function (err) {
  if (!err) console.log('done');
});

Output: 

Reference: 




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