BubbleSets for JavaScript

A JavaScript implementation of Christopher Collins' bubble sets without the use of external libraries. You can find a Java implementation here.

Additional Features:

• Shape simplifying transformations
• Full TypeScript types
• Sparse potential area computation

Usage:

npm i bubblesets

and

import {
  BSplineShapeGenerator,
  BubbleSet,
  PointPath,
  ShapeSimplifier,
} from 'bubblesets';

const pad = 5;
// bubbles can be reused for subsequent runs or different sets of rectangles
const bubbles = new BubbleSet();
// rectangles needs to be a list of objects of the form { x: 0, y: 0, width: 0, height: 0 }
// lines needs to be a list of objects of the form { x1: 0, x2: 0, y1: 0, y2: 0 }
// lines can be null to infer lines between rectangles automatically
const list = bubbles.createOutline(
  BubbleSet.addPadding(rectangles, pad),
  BubbleSet.addPadding(otherRectangles, pad),
  null /* lines */
);
// outline is a path that can be used for the attribute d of a SVG path element
const outline = new PointPath(list).transform([
  new ShapeSimplifier(0.0),  // removes path points by removing (near) colinear points
  new BSplineShapeGenerator(),  // smoothes the output shape using b-splines
  new ShapeSimplifier(0.0),  // removes path points by removing (near) colinear points
]);
path.setAttribute('d', `${outline}`);

See also the demo (add rectangles by clicking with the left or right mouse button).

This implementation is based on the Java code originally written by Christopher Collins. If you're missing a feature from the Java version or find a bug please open an issue. Pull requests are also welcome.