node-wordcloud

node-wordcloud

Tag cloud presentation for NodeJS (Based on wordcloud2.js)

Installation

npm install node-wordcloud

Usage

const { createCanvas } = require('canvas');
const WordCloud = require('node-wordcloud')();

const canvas = createCanvas(500, 500);

// Array of words [text: String, weight: Number][]
// The weight of word isn't the absolute size of word, the real size will be automatically calculated based on options.sizeRange
const list = [['word', 150], ['hello', 140], ['world', 130], ['test', 90]];

const wordcloud = WordCloud(canvas, { list });

// you should call draw() to draw the wordcloud manually
wordcloud.draw();

const buffer = canvas.toBuffer();

// you can use the wordcloud.updateList() to update the word list
// wordcloud.updateList([['word', 150], ['hello', 140], ['world', 130], ['test', 90]]);
// wordcloud.draw();

Example

See example folder for more examples.

Options

Support most of options of wordcloud2.js, except for:

• clearCanvas
• weightFactor
• wait
• minRotation
• maxRotation
• classes
• hover
• click

Also we added some options:

+ {
+     sizeRange: [16, 68], 
+     rotationRange: [-70, 70],
+ }

API

We remove the support for generating word cloud in svg format, because some canvas implementation already allow to generate svg directly (such as node-canvas).

This module will not draw word cloud automatically, you need to call wordcloud.draw() to draw word cloud. See example for more details.

You can use wordcloud.updateList(list: Array<[text: String, weight: Number]>) to update word list. See example for more details.

In wordcloud2.js, you can import module by const WordCloud = require('wordcloud2'), but in node-wordcloud, it will be const WordCloud = require('node-wordcloud')(), you can choose the canvas implementation you want to use by passing createCanvas function, here here some examples:

// use node-canvas default
const WordCloud = require('node-wordcloud')();

// use node-canvas
const { createCanvas } = require('canvas');
const WordCloud = require('node-wordcloud')(createCanvas);

// use skia-canvas
const { Canvas } = require('skia-canvas');
const WordCloud = require('node-wordcloud')((w, h) => new Canvas(w, h));

// etc.

LICENSE

MIT License