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Example code of emcconville/point-reduction-algorithms

Informations about the package point-reduction-algorithms

Point Reduction Algorithms

Latest Stable Version Build Status Coverage Status License

A collection of algorithms for reducing the number of points in polygon / polyline.

Custom shapes, polygon & polyline in web-map applications, can have too many points. Often a shape will be rendered at a distant zoom-level, and wouldn't require such high-resolution. This library's goal is to provided basic methods to simplify & reduce shapes.

Install

With composer.

$ curl -sS https://getcomposer.org/installer | php
$ cat > composer.json <<EOF
{
   "require": {
      "emcconville/point-reduction-algorithms" : "~1.0"
   }
}
EOF
$ php composer.phar install

Algorithms & Usage

Below is an original, uncompressed, polyline with 2151 points, and is delivered as SVG weighing in @ 175K.

Original example

All algorithms share a common abstraction, but each class implements a unique reduce method. Most reduction methods require one argument for tolerance / threshold; except, Visvalingam–Whyatt requires the desired final point count, and Opheim requires two independent thresholds.

Example Pseudo code:

The $myPoints must be an array, or traversable object that supports removing element at index. Each user defined point must implement PointReduction\Common\PointInterface which enforces a getCoordinates method. This common interface allows user objects to have any type of property (ie. x/y, latitude/longitude, left/top).

Ramer–Douglas–Peucker

The original polygon of 2151 points has been reduced to 343.

Ramer–Douglas–Peucker example

Visvalingam–Whyatt

The original polygon of 2151 points has been reduced to 343.

Visvalingam–Whyatt example

Reumann–Witkam

The original polygon of 2151 points has been reduced to 872.

Reumann–Witkam example

Opheim

The original polygon of 2151 points has been reduced to 684.

Opheim example

Lang

The original polygon of 2151 points has been reduced to 293.

Lang example

Zhao-Saalfeld

Added in version 1.2.0.

The original polygon of 2151 points has been reduced to 1493.

Zhao-Saalfeld example

Radial Distance

Added in version 1.2.0.

The original polygon of 2151 points has been reduced to 449.

Radial Distance example

All versions of point-reduction-algorithms with dependencies

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Requires php Version >=5.4
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