Nodejs | GM drawPolyline() Function

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

Syntax:

drawPolyline( [x0, y0], ..., [xn, yn] )

Parameters: This function accepts the array of x and y coordinates.

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")
  
// Invoke drawPolyline function with array of points
.drawPolyline([12, 60], [45, 79], [80, 120], [300, 32])
  
// Process and write the image 
.write("drawPolyline1.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 drawPolyline function with
// array of points
.drawPolyline([12, 60], [45, 79], [80, 120],
          [300, 32], [400, 150], [500, 200])
  
// Call to drawText Function
.drawText(100, 280, "GeeksforGeeks!")
  
// Process and write the image 
.write("drawPolyline1.png", function (err) {
  if (!err) console.log('done');
});

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Output:

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