Rough Js

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Rough.js is a small (<9kB gzipped) graphics library that lets you draw in a sketchy , hand-drawn-like , style.
The library defines primitives to draw lines, curves, arcs, polygons, circles, and ellipses. It also supports drawing SVG paths .
Rough.js works with both Canvas and SVG .
View Full Rough.js API is available on Github.
Fill styles can be: hachure (default), solid , zigzag , cross-hatch , dots , sunburst , dashed , or zigzag-line
Core algorithms for drawing lines and ellipse outlines were adapted from handy processing lib.
Algorithm to convert SVG arcs to Canvas described here was adapted from Mozilla codebase
Support development of this project by sponsoring on Github .
Alternatively, you can also sponsor or Open Collective .


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This is the first release of Rough.js in about 10 months.
It may not seem like a big release, but it is significant in a couple of ways. Firstly, this is the first time since the library's inception, the core rendering algorithms have been modified. Secondly, for a change, I have removed something from the library in addition to adding some functionality.
Many users had asked for this feature. Rough.js computes shapes by generating a lot of random offsets. As a result, every render creates a unique hand-drawn looking shape. There are cases, however, where this is not the desired behavior and the application may want to persist the shape even at different sizes.
The API now allows the user to pass in a seed value which is used to generate a predictable sequence of random numbers. Providing the seed is optional.
In this image above, notice the two squares have the same outlines, even though they are rendered separately with different sizes and fill colors.
Rough.js can a fill a shape with hachure lines. These lines are also used in creating other fill styles like cross-hatch , zigzag , etc. The old algorithm was adapted from Handy's processing code with minor changes. The code was a bit convoluted, and it did not handle concave shapes very well at some hachure angles, creating cases like these:
The new algorithm is similar in nature and is based on the Scan-line rasterization algorithm . To create hachure lines, the scan lines are incremented in steps based on the specified hachureGap . This algorithm, however, is designed for horizontal scan-lines.
To achieve various hachure angles, I first rotate the shape itself by the hachureAngle . Then I calculate the horizontal scan-lines for the rotated shape. The computed lines are then rotated back by -hachureAngle .
The new algorithm resulted in half the lines of code, and performs about 20% faster.
Part of creating the sketchy look is to create imperfect artifacts that are generated by randomizing certain parameters. Some of these parameters get exagerated based on the shape and the random values that are generated. So a shape with a roughness value of 1 looked more like a roughness value of 3 at a different size. This was particularly noticable when drawing ellipses where the relationship is quadartic. In the image below, notice the circles have the same shape, but the outer circles look more rough .
The algorithm now auto-adjusts itself based on the size of the shape. Following is the same set of circles generated with auto-adjust
Another feature, often requested was to add ability to draw shapes without the outline. This was achieved by setting the stroke color to transparent . This does the job, but the underlying shape still has the extra instruction to draw the outline. If the sroke is set to none , then the outline is not computed at all.
The main reason for upgrading to a major version was the it is strictly not backwards compatible and the location and names of the bundled resources have changed.
async and web-worker version of rough.js is not built anymore because it can be created by the app using roughjs generator object.
Also, the sunburst style of filling shapes has been removed from the API. It was not popular and had several corner cases where it did not work.

https://roughjs.com/
https://roughjs.com/posts/release-4.0/
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