Node.js GM drawPolygon() Function

Last Updated : 30 Mar, 2023

The drawPolygon() function is an inbuilt function in the GraphicsMagick library which is used to draw a polygon with specified coordinates. The function returns the true value of success.

Syntax:

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

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

Return Value: This function returns the GraphicsMagick object.

Example 1:

javascript

// Include gm library
const gm = require('gm');
 
// Import the image
gm(500, 200, 'white')
 
// Set the color for the stroke
.stroke("green", 3)
 
// Set font as 'Helvetica'
.font("Helvetica.ttf", 60)
 
// Use drawText() Function
.drawText(30, 160, "GeeksforGeeks!")
 
// Invoke drawPolygon function
// with array of points
.drawPolygon([12, 60], [45, 79],
             [80, 120], [300, 32], [300, 98])
 
// Process and write the image
.write("drawPolygon1.png", function (err) {
    if (!err) console.log('done');
});

Output:

Example 2:

javascript

// Include gm library
const gm = require('gm');
 
// Import the image
gm('https://media.geeksforgeeks.org/wp-content/uploads/20200227114541/1406-3.png')
 
// Set the color for the stroke
.stroke("#000000", 5)
 
// Invoke drawPolygon function with array of points
.drawPolygon([12, 60], [45, 79], [80, 120], [300, 32])
 
// Process and write the image
.write("drawPolygon1.png", function (err) {
    if (!err) console.log('done');
});