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

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

Syntax:

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

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

  • x0: This parameter stores the x-coordinate value of the initial point.
  • y0: This parameter stores the y-coordinate value of the initial point.
  • x1: This parameter stores the x-coordinate value of the final point.
  • y1: This parameter stores the y-coordinate value of the final point.
  • r0: This parameter stores the x-radius value of the ellipse.
  • r1: This parameter stores the y-radius value of the ellipse.

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 drawEllipse function with
// x0 as 230, y0 as 45, x1 as 100,
// y1 as 89, r0 as 50 and r1 as 40
.drawEllipse(230, 45, 300, 89, 50, 40)
  
// Process and write the image 
.write("drawEllipse1.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)
  
//Call to drawText Function
.drawText(100, 280, "GeeksforGeeks!")
  
// Invoke drawEllipse function with x0
// as 230, y0 as 45, x1 as 100, y1 as
// 89, r0 as 50 and r1 as 40
.drawEllipse(290, 15, 300, 210, 20, 160)
  
// Process and write the image 
.write("drawEllipse1.png", function (err) {
  if (!err) console.log('done');
});

Output:

Reference:

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