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Nodejs | GM drawArc() Function
  • Last Updated : 05 Mar, 2020

The drawArc() function is an inbuilt function in the GraphicsMagick library which is used to draw an arc with specified coordinates. The function returns the true value on success.

Syntax:

drawArc( x0, y0, x1, y1, r0, r1 )

Parameters: This function accept six parameters as mentioned above and described below:.

  • x0: This parameter stores the value of the x-coordinate of the initial point.
  • y0: This parameter stores the value of the y-coordinate of the initial point.
  • x1: This parameter stores the value of the x-coordinate of the final point.
  • y1: This parameter stores the value of the y-coordinate of the final point.
  • r0: This parameter takes the value of starting angle of rotation in degrees.
  • r1: This parameter takes the value of ending angle of rotation in degrees.

Return Value: This function returns the GraphicsMagick object.

Original Image:



Example 1:




// Include gm library
var gm = require('gm').subClass({imageMagick: true});
  
// Import the image
gm('1.png')
  
// set the color for the stroke
.stroke("#ffffff")
  
// Invoke drawArc function with x0, y0, x1, y1, r0, r1
.drawArc(30, 20, 390, 70, 140, 110)
  
// Process an d write the image 
.write("drawArc1.png", function (err) {
  if (!err) console.log('done');
});

Output:

Example 2:




// 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)
  
// Invoke drawArc function with x0, y0, x1, y1, r0, r1
.drawArc(30, 20, 390, 110, 240, 210)
  
// Call to drawText Function
.drawText(100, 280, "GeeksforGeeks!")
  
// Process and write the image 
.write("drawArc1.png", function (err) {
  if (!err) console.log('done');
});

Output:

Reference:

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