Getting Started with RoughJS


Rough.js is a light weight (~9kB gzipped) graphics library that lets you draw in a sketchyhand-drawn-like, style. The library defines primitives to draw lines, curves, arcs, polygons, circles, and ellipses. It also supports drawing SVG paths.

Here is the project website:https://roughjs.com/

Rough.js works with both Canvas and SVG.

Install

The latest Rough.js can be downloaded from the dist folder.

or from npm:

npm install --save roughjs

Usage

const rc = rough.canvas(document.getElementById('canvas'));
rc.rectangle(10, 10, 200, 200); // x, y, width, height

or SVG

const rc = rough.svg(svg);
let node = rc.rectangle(10, 10, 200, 200); // x, y, width, height
svg.appendChild(node);

Lines and Ellipses

rc.circle(80, 120, 50); // centerX, centerY, diameter
rc.ellipse(300, 100, 150, 80); // centerX, centerY, width, height
rc.line(80, 120, 300, 100); // x1, y1, x2, y2

Filling

rc.circle(50, 50, 80, { fill: 'red' }); // fill with red hachure
rc.rectangle(120, 15, 80, 80, { fill: 'red' });
rc.circle(50, 150, 80, { fill: "rgb(10,150,10)", fillWeight: 3 // thicker lines for hachure
});
rc.rectangle(220, 15, 80, 80, { fill: 'red', hachureAngle: 60, // angle of hachure, hachureGap: 8
});
rc.rectangle(120, 105, 80, 80, { fill: 'rgba(255,0,200,0.2)', fillStyle: 'solid' // solid fill
});

Fill styles can be: hachure(default), solidzigzagcross-hatch, or dots

Sketching style

rc.rectangle(15, 15, 80, 80, { roughness: 0.5, fill: 'red' });
rc.rectangle(120, 15, 80, 80, { roughness: 2.8, fill: 'blue' });
rc.rectangle(220, 15, 80, 80, { bowing: 6, stroke: 'green', strokeWidth: 3 });

SVG Paths

rc.path('M80 80 A 45 45, 0, 0, 0, 125 125 L 125 80 Z', { fill: 'green' });
rc.path('M230 80 A 45 45, 0, 1, 0, 275 125 L 275 80 Z', { fill: 'purple' });
rc.path('M80 230 A 45 45, 0, 0, 1, 125 275 L 125 230 Z', { fill: 'red' });
rc.path('M230 230 A 45 45, 0, 1, 1, 275 275 L 275 230 Z', { fill: 'blue' });

SVG Path with simplification:

Using web workers

If you have Workly imported on your web page (~1k only), RoughJS will automatically offload all processing to a web worker - freeing up your main UI thread. This is great when creating complex drawings using RoughJs like maps. Read more about it here.

<script src="https://cdn.jsdelivr.net/gh/pshihn/workly/dist/workly.min.js"></script>
<script src="../../dist/rough.min.js"></script>