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 the 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 libraryconst gm = require('gm');
// Import the imagegm('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 libraryconst gm = require('gm');
//Import the imagegm(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: