Node.js GM drawPolyline() Function
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 libraryconst gm = require('gm').subClass({imageMagick: true});// Import the imagegm('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 libraryconst gm = require('gm');// Import the imagegm(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, "w3wiki!")// Process and write the image.write("drawPolyline1.png", function (err) { if (!err) console.log('done');}); |
Output:
Reference:
- http://www.graphicsmagick.org/GraphicsMagick.html#details-draw
- https://www.npmjs.com/package/gm
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