StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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103 lines
3.3 KiB
103 lines
3.3 KiB
4 years ago
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point-in-big-polygon
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====================
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Industrial scale point-in-polygon test. Given a polygon, this module preprocesses it in O(n log(n)) time such that any point can be classified against the polygon in O(log(n)) operations. All computations are performed in exact arithmetic.
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If you want to use multiple polygons/regions, you should use [point-in-region](https://github.com/mikolalysenko/point-in-region) instead.
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# Example
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```javascript
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var preprocessPolygon = require("point-in-big-polygon")
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//Define the polygon loops
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var loops = [
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[ [-10, -10], [-10, 10], [10, 10], [10, -10] ],
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[ [-1, -1], [1, -1], [1, 1], [-1, 1] ]
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]
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//Preprocess it
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var classifyPoint = preprocessPolygon(loops)
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//Render polygon test in ASCII to console
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var img = []
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for(var y=-12; y<=12; y+=1) {
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var row = []
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for(var x=-12; x<=12; x+=0.5) {
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var v = classifyPoint([x, y])
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if(v < 0) {
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row.push('-')
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} else if(v === 0) {
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row.push('o')
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} else {
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row.push('+')
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}
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}
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img.push(row.join(''))
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}
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console.log(img.join('\n'))
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```
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Example output:
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```
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+++++++++++++++++++++++++++++++++++++++++++++++++
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+++++++++++++++++++++++++++++++++++++++++++++++++
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++++ooooooooooooooooooooooooooooooooooooooooo++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o-----------------ooooo-----------------o++++
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++++o-----------------o+++o-----------------o++++
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++++o-----------------ooooo-----------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++o---------------------------------------o++++
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++++ooooooooooooooooooooooooooooooooooooooooo++++
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+++++++++++++++++++++++++++++++++++++++++++++++++
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+++++++++++++++++++++++++++++++++++++++++++++++++
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```
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# Install
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This module works in any reasonable CommonJS environment including browserify, iojs and node.js.
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```
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npm install point-in-big-polygon
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```
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# API
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## Constructor
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#### `var classifyPoint = require("point-in-big-polygon")(loops)`
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Preprocess a polygon given by a collection of clockwise oriented loops to handle point membership queries.
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* `loops` are a collection of oriented loops representing the boundary of the polygon. These loops must be manifold (ie no self intersections or dangling edges).
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**Returns** A point membership function that can be used to classify points relative to the function
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## Method
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#### `classifyPoint(p)`
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This function is the result of running the preprocessing operation on a polygon. It takes a single point as input and tests it against the boundary.
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* `p` is a point encoded as a length 2 array
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**Returns** A number which classifies `p` relative to the boundary
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* `-1` means that `p` is inside
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* `0` means that `p` is on the boundary
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* `+1` means that `p` is outside
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# Credits
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(c) 2014 Mikola Lysenko. MIT License
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