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vishull2d

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vishull2d

Visible regions for 2D poly-lines

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npmnpm
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0.0.1
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1
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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

require("vishull2d")(segments, center)

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

Note This code assumes that all segments intersect only at their end points

Credits

(c) 2013 Mikola Lysenko. MIT License

Keywords

visibility

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Package last updated on 02 Apr 2013

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