The drawPolyline() function is an inbuilt function in the GraphicsMagick library which is used to draw polylines with specified coordinates. The function returns the true value of 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:
javascript
// Include gm library const 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' );
}); |
Output:
Example 2:
javascript
// Include gm library const 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' );
}); |
Output:
Reference: