vishull2d

Visible regions for 2D poly-lines

vishull2d

Computes the visible region from a point for a given environment represented by a collection of line segments. Based on Amit Patel's blog post

Use

Just install it using npm:

npm install vishull2d

Then you can use it in your game like this:

var vishull = require("vishull2d")
 
//Line segments are encoded as pairs of arrays 
var lines = [
  [[10, 10], [10, -10]]
]
 
//Compute visible hull from the point [0,0] 
var result = vishull2d(lines, [0,0])
var region = result.region
var ids = result.ids

Computes the visible hull from the point center

  • segments is a collection of line segments
  • center is the point from which the visibility is computed

Returns: An object with two properties:

  • region a counter-clockwise oriented simple polygon representing the visible region.
  • ids a list of indices into segments representing the walls visible from the region

Credits

(c) 2013 Mikola Lysenko. MIT License