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

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

Syntax:

drawLine( x0, y0, x1, y1 )

Parameters: This function accepts four 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.

Return Value: This function returns the GraphicsMagick object.

Original Image:



Example 1:

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// Include gm library
var gm = require('gm').subClass({imageMagick: true});
  
// Import the image
gm('1.png')
  
// Set the color for the stroke
.stroke("#000000", 20)
  
// Invoke drawLine function with x0 as 100,
// y0 as 45, x1 as 100, y1 as 89, r0 as 50
// and r1 as 40
.drawLine(100, 30, 400, 80)
  
// Process and write the image 
.write("drawLine1.png", function (err) {
  if (!err) console.log('done');
});

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Output:

Example 2:

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// 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 drawLine function with
// x0 as 100, y0 as 45, x1 as 100,
// y1 as 200
.drawLine(100, 45, 100, 200)
  
// Invoke drawLine function with
// x0 as 100, y0 as 45, x1 as 500,
// y1 as 45
.drawLine(100, 45, 500, 45)
  
// Invoke drawLine function with
// x0 as 500, y0 as 45, x1 as 500,
// y1 as 200
.drawLine(500, 45, 500, 200)
  
// Call to drawText Function
.drawText(100, 280, "GeeksforGeeks!")
  
// Process and write the image 
.write("drawLine1.png", function (err) {
  if (!err) console.log('done');
});

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Output:

Reference:




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