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canvas

Canvas graphics API backed by Cairo

  • 1.1.6
  • Source
  • npm
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What is canvas?

The canvas npm package is a powerful library that allows Node.js users to draw 2D graphics on the fly using a Canvas API similar to the one provided by browsers. It can be used for creating images, manipulating graphics, and generating dynamic visual content.

What are canvas's main functionalities?

Drawing shapes

This feature allows you to draw basic shapes such as rectangles, circles, and lines on the canvas.

const { createCanvas } = require('canvas');
const canvas = createCanvas(200, 200);
const ctx = canvas.getContext('2d');

// Draw a rectangle
ctx.fillStyle = 'green';
ctx.fillRect(10, 10, 150, 100);

Text manipulation

With the canvas package, you can add text to your images, apply fonts, styles, and rotation.

const { createCanvas } = require('canvas');
const canvas = createCanvas(200, 200);
const ctx = canvas.getContext('2d');

// Draw text
ctx.font = '30px Impact';
ctx.rotate(0.1);
ctx.fillText('Awesome!', 50, 100);

Image manipulation

This feature allows you to load images, draw them onto the canvas, and manipulate their appearance.

const { createCanvas, loadImage } = require('canvas');
const canvas = createCanvas(200, 200);
const ctx = canvas.getContext('2d');

loadImage('image.png').then((image) => {
  ctx.drawImage(image, 50, 50, 150, 100);
});

Pixel manipulation

Canvas allows direct pixel manipulation for effects like inversion, brightness, contrast, and more.

const { createCanvas } = require('canvas');
const canvas = createCanvas(200, 200);
const ctx = canvas.getContext('2d');

// Draw a rectangle
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 50, 50);

// Get pixel data
const imageData = ctx.getImageData(0, 0, 50, 50);

// Manipulate pixels
for (let i = 0; i < imageData.data.length; i += 4) {
  imageData.data[i] = 255 - imageData.data[i]; // Invert red
  imageData.data[i+1] = 255 - imageData.data[i+1]; // Invert green
  imageData.data[i+2] = 255 - imageData.data[i+2]; // Invert blue
}

// Put the image data back onto the canvas
ctx.putImageData(imageData, 0, 0);

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Package last updated on 02 Aug 2014

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