├── .gitignore
├── .idea
    └── php.xml
├── LICENSE
├── README.md
├── Simplify.php
├── composer.json
└── test.php


/.gitignore:
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1 | # Created by .ignore support plugin (hsz.mobi)
2 | 


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/.idea/php.xml:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="PhpProjectSharedConfiguration" php_language_level="5.3.0" />
4 | </project>
5 | 
6 | 


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/LICENSE:
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 1 | Copyright (c) 2012, Vladimir Agafonkin
 2 | All rights reserved.
 3 | 
 4 | Redistribution and use in source and binary forms, with or without modification, are
 5 | permitted provided that the following conditions are met:
 6 | 
 7 |    1. Redistributions of source code must retain the above copyright notice, this list of
 8 |       conditions and the following disclaimer.
 9 | 
10 |    2. Redistributions in binary form must reproduce the above copyright notice, this list
11 |       of conditions and the following disclaimer in the documentation and/or other materials
12 |       provided with the distribution.
13 | 
14 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
15 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
17 | COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
21 | TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 | 


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/README.md:
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 1 | simplify-php
 2 | ============
 3 | 
 4 | PHP port of https://github.com/mourner/simplify-js
 5 | 
 6 | 
 7 | Run
 8 | ===
 9 | 
10 | 
11 | ```php
12 | require_once 'vendor/autoload.php';
13 | 
14 | Simplify::run($points, $tolerance, $highestQuality);
15 | 
16 | ```
17 | 
18 | Install
19 | =======
20 | 
21 | composer package name is andreychumak/simplify-php
22 | 


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/Simplify.php:
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  1 | <?php
  2 | 
  3 | /**
  4 |  * Simplify path by removing extra points with given tolerance
  5 |  * Port of simplify.js algorithm
  6 |  * http://github.com/andreychumak/simplify-php
  7 |  *
  8 |  * (c) 2013, Vladimir Agafonkin
  9 |  * Simplify.js, a high-performance JS polyline simplification library
 10 |  * http://mourner.github.io/simplify-js
 11 | */
 12 | 
 13 | class Simplify {
 14 | 
 15 | 	/**
 16 | 	 * @param array $points
 17 | 	 * @param float|int $tolerance
 18 | 	 * @param bool $highestQuality
 19 | 	 * @return array
 20 | 	 */
 21 | 	public static function run(array $points, $tolerance = 1, $highestQuality = false) {
 22 | 		if (count($points) <= 1) return $points;
 23 | 
 24 | 		$sqTolerance = $tolerance*$tolerance;
 25 | 
 26 | 		$points = $highestQuality ? $points : self::simplifyRadialDist($points, $sqTolerance);
 27 | 		$points = self::simplifyDouglasPeucker($points, $sqTolerance);
 28 | 
 29 | 		return $points;
 30 | 	}
 31 | 
 32 | 	// basic distance-based simplification
 33 | 	private static function simplifyRadialDist($points, $sqTolerance) {
 34 | 
 35 | 		$prevPoint = $points[0];
 36 | 		$newPoints = array($prevPoint);
 37 | 		$point = null;
 38 | 
 39 | 		for ($i = 1, $len = count($points); $i < $len; $i++) {
 40 | 			$point = $points[$i];
 41 | 
 42 | 			if (self::getSqDist($point, $prevPoint) > $sqTolerance) {
 43 | 				$newPoints[] = $point;
 44 | 				$prevPoint = $point;
 45 | 			}
 46 | 		}
 47 | 
 48 | 		if ($prevPoint !== $point) $newPoints[] = $point;
 49 | 
 50 | 		return $newPoints;
 51 | 	}
 52 | 
 53 | 	// square distance between 2 points
 54 | 	private static function getSqDist($p1, $p2) {
 55 | 
 56 | 		$dx = $p1['x'] - $p2['x'];
 57 | 		$dy = $p1['y'] - $p2['y'];
 58 | 
 59 | 		return $dx * $dx + $dy * $dy;
 60 | 	}
 61 | 
 62 | 	// simplification using optimized Douglas-Peucker algorithm with recursion elimination
 63 | 	private static function simplifyDouglasPeucker($points, $sqTolerance) {
 64 | 
 65 | 		$len = count($points);
 66 | 		$markers = array_fill(0, $len-1, null);
 67 | 		$first = 0;
 68 | 		$last = $len - 1;
 69 | 		$stack = array();
 70 | 		$newPoints = array();
 71 | 		$index = null;
 72 | 
 73 | 		$markers[$first] = $markers[$last] = 1;
 74 | 
 75 | 		while ($last) {
 76 | 
 77 | 			$maxSqDist = 0;
 78 | 
 79 | 			for ($i = $first + 1; $i < $last; $i++) {
 80 | 				$sqDist = self::getSqSegDist($points[$i], $points[$first], $points[$last]);
 81 | 
 82 | 				if ($sqDist > $maxSqDist) {
 83 | 					$index = $i;
 84 | 					$maxSqDist = $sqDist;
 85 | 				}
 86 | 			}
 87 | 
 88 | 			if ($maxSqDist > $sqTolerance) {
 89 | 				$markers[$index] = 1;
 90 | 				array_push($stack, $first, $index, $index, $last);
 91 | 			}
 92 | 
 93 | 			$last = array_pop($stack);
 94 | 			$first = array_pop($stack);
 95 | 		}
 96 | 
 97 | 		//var_dump($markers, $points, $i);
 98 | 		for ($i = 0; $i < $len; $i++) {
 99 | 			if ($markers[$i]) $newPoints[] = $points[$i];
100 | 		}
101 | 
102 | 		return $newPoints;
103 | 	}
104 | 
105 | 	// square distance from a point to a segment
106 | 	private static function getSqSegDist($p, $p1, $p2) {
107 | 		$x = $p1['x'];
108 | 		$y = $p1['y'];
109 | 		$dx = $p2['x'] - $x;
110 | 		$dy = $p2['y'] - $y;
111 | 
112 | 		if (intval($dx) !== 0 || intval($dy) !== 0) {
113 | 
114 | 			$t = (($p['x'] - $x) * $dx + ($p['y'] - $y) * $dy) / ($dx * $dx + $dy * $dy);
115 | 
116 | 			if ($t > 1) {
117 | 				$x = $p2['x'];
118 | 				$y = $p2['y'];
119 | 
120 | 			} else if ($t > 0) {
121 | 				$x += $dx * $t;
122 | 				$y += $dy * $t;
123 | 			}
124 | 		}
125 | 
126 | 		$dx = $p['x'] - $x;
127 | 		$dy = $p['y'] - $y;
128 | 
129 | 		return $dx * $dx + $dy * $dy;
130 | 	}
131 | 
132 | }
133 | 


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/composer.json:
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1 | {
2 | 	"name": "andreychumak/simplify-php",
3 | 	"license": "BSD-2-Clause",
4 | 	"version": "1.0.2"
5 | }
6 | 


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/test.php:
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 1 | <?php
 2 | 
 3 | $points = array(
 4 | 	array('x'=>224.55,'y'=>250.15),array('x'=>226.91,'y'=>244.19),array('x'=>233.31,'y'=>241.45),array('x'=>234.98,'y'=>236.06),
 5 | 	array('x'=>244.21,'y'=>232.76),array('x'=>262.59,'y'=>215.31),array('x'=>267.76,'y'=>213.81),array('x'=>273.57,'y'=>201.84),
 6 | 	array('x'=>273.12,'y'=>192.16),array('x'=>277.62,'y'=>189.03),array('x'=>280.36,'y'=>181.41),array('x'=>286.51,'y'=>177.74),
 7 | 	array('x'=>292.41,'y'=>159.37),array('x'=>296.91,'y'=>155.64),array('x'=>314.95,'y'=>151.37),array('x'=>319.75,'y'=>145.16),
 8 | 	array('x'=>330.33,'y'=>137.57),array('x'=>341.48,'y'=>139.96),array('x'=>369.98,'y'=>137.89),array('x'=>387.39,'y'=>142.51),
 9 | 	array('x'=>391.28,'y'=>139.39),array('x'=>409.52,'y'=>141.14),array('x'=>414.82,'y'=>139.75),array('x'=>427.72,'y'=>127.30),
10 | 	array('x'=>439.60,'y'=>119.74),array('x'=>474.93,'y'=>107.87),array('x'=>486.51,'y'=>106.75),array('x'=>489.20,'y'=>109.45),
11 | 	array('x'=>493.79,'y'=>108.63),array('x'=>504.74,'y'=>119.66),array('x'=>512.96,'y'=>122.35),array('x'=>518.63,'y'=>120.89),
12 | 	array('x'=>524.09,'y'=>126.88),array('x'=>529.57,'y'=>127.86),array('x'=>534.21,'y'=>140.93),array('x'=>539.27,'y'=>147.24),
13 | 	array('x'=>567.69,'y'=>148.91),array('x'=>575.25,'y'=>157.26),array('x'=>580.62,'y'=>158.15),array('x'=>601.53,'y'=>156.85),
14 | 	array('x'=>617.74,'y'=>159.86),array('x'=>622.00,'y'=>167.04),array('x'=>629.55,'y'=>194.60),array('x'=>638.90,'y'=>195.61),
15 | 	array('x'=>641.26,'y'=>200.81),array('x'=>651.77,'y'=>204.56),array('x'=>671.55,'y'=>222.55),array('x'=>683.68,'y'=>217.45),
16 | 	array('x'=>695.25,'y'=>219.15),array('x'=>700.64,'y'=>217.98),array('x'=>703.12,'y'=>214.36),array('x'=>712.26,'y'=>215.87),
17 | 	array('x'=>721.49,'y'=>212.81),array('x'=>727.81,'y'=>213.36),array('x'=>729.98,'y'=>208.73),array('x'=>735.32,'y'=>208.20),
18 | 	array('x'=>739.94,'y'=>204.77),array('x'=>769.98,'y'=>208.42),array('x'=>779.60,'y'=>216.87),array('x'=>784.20,'y'=>218.16),
19 | 	array('x'=>800.24,'y'=>214.62),array('x'=>810.53,'y'=>219.73),array('x'=>817.19,'y'=>226.82),array('x'=>820.77,'y'=>236.17),
20 | 	array('x'=>827.23,'y'=>236.16),array('x'=>829.89,'y'=>239.89),array('x'=>851.00,'y'=>248.94),array('x'=>859.88,'y'=>255.49),
21 | 	array('x'=>865.21,'y'=>268.53),array('x'=>857.95,'y'=>280.30),array('x'=>865.48,'y'=>291.45),array('x'=>866.81,'y'=>298.66),
22 | 	array('x'=>864.68,'y'=>302.71),array('x'=>867.79,'y'=>306.17),array('x'=>859.87,'y'=>311.37),array('x'=>860.08,'y'=>314.35),
23 | 	array('x'=>858.29,'y'=>314.94),array('x'=>858.10,'y'=>327.60),array('x'=>854.54,'y'=>335.40),array('x'=>860.92,'y'=>343.00),
24 | 	array('x'=>856.43,'y'=>350.15),array('x'=>851.42,'y'=>352.96),array('x'=>849.84,'y'=>359.59),array('x'=>854.56,'y'=>365.53),
25 | 	array('x'=>849.74,'y'=>370.38),array('x'=>844.09,'y'=>371.89),array('x'=>844.75,'y'=>380.44),array('x'=>841.52,'y'=>383.67),
26 | 	array('x'=>839.57,'y'=>390.40),array('x'=>845.59,'y'=>399.05),array('x'=>848.40,'y'=>407.55),array('x'=>843.71,'y'=>411.30),
27 | 	array('x'=>844.09,'y'=>419.88),array('x'=>839.51,'y'=>432.76),array('x'=>841.33,'y'=>441.04),array('x'=>847.62,'y'=>449.22),
28 | 	array('x'=>847.16,'y'=>458.44),array('x'=>851.38,'y'=>462.79),array('x'=>853.97,'y'=>471.15),array('x'=>866.36,'y'=>480.77)
29 | );
30 | 
31 | $simplified = array(
32 | 	array('x'=>224.55,'y'=>250.15),array('x'=>267.76,'y'=>213.81),array('x'=>296.91,'y'=>155.64),array('x'=>330.33,'y'=>137.57),
33 | 	array('x'=>409.52,'y'=>141.14),array('x'=>439.60,'y'=>119.74),array('x'=>486.51,'y'=>106.75),array('x'=>529.57,'y'=>127.86),
34 | 	array('x'=>539.27,'y'=>147.24),array('x'=>617.74,'y'=>159.86),array('x'=>629.55,'y'=>194.60),array('x'=>671.55,'y'=>222.55),
35 | 	array('x'=>727.81,'y'=>213.36),array('x'=>739.94,'y'=>204.77),array('x'=>769.98,'y'=>208.42),array('x'=>779.60,'y'=>216.87),
36 | 	array('x'=>800.24,'y'=>214.62),array('x'=>820.77,'y'=>236.17),array('x'=>859.88,'y'=>255.49),array('x'=>865.21,'y'=>268.53),
37 | 	array('x'=>857.95,'y'=>280.30),array('x'=>867.79,'y'=>306.17),array('x'=>859.87,'y'=>311.37),array('x'=>854.54,'y'=>335.40),
38 | 	array('x'=>860.92,'y'=>343.00),array('x'=>849.84,'y'=>359.59),array('x'=>854.56,'y'=>365.53),array('x'=>844.09,'y'=>371.89),
39 | 	array('x'=>839.57,'y'=>390.40),array('x'=>848.40,'y'=>407.55),array('x'=>839.51,'y'=>432.76),array('x'=>853.97,'y'=>471.15),
40 | 	array('x'=>866.36,'y'=>480.77)
41 | );
42 | 
43 | require 'Simplify.php';
44 | 
45 | 
46 | // TODO PHPUnit
47 | echo serialize($simplified) == serialize(Simplify::run($points, 5)) ? 'pass' : 'fail';
48 | echo PHP_EOL;
49 | 


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