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| author | Chris Schlaeger <chris@linux.com> | 2015-10-17 21:36:38 +0200 |
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| committer | Chris Schlaeger <chris@linux.com> | 2015-10-17 21:36:38 +0200 |
| commit | e30f267181d990947e67909de4809fa941698c85 (patch) | |
| tree | 46e9f94c2b3699ed378963b420b8a8d361286ea1 /misc/openlayers/examples/simplify-linestring.html | |
| parent | e763ceb183f389fcd314a4a6a712d87c9d4cdb32 (diff) | |
| download | postrunner-e30f267181d990947e67909de4809fa941698c85.zip | |
Upgrading openlayers to 3.x
Diffstat (limited to 'misc/openlayers/examples/simplify-linestring.html')
| -rw-r--r-- | misc/openlayers/examples/simplify-linestring.html | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/misc/openlayers/examples/simplify-linestring.html b/misc/openlayers/examples/simplify-linestring.html deleted file mode 100644 index 15160a0..0000000 --- a/misc/openlayers/examples/simplify-linestring.html +++ /dev/null @@ -1,103 +0,0 @@ -<!DOCTYPE html> -<html> - <head> - <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> - <meta name="apple-mobile-web-app-capable" content="yes"> - <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> - <title>Simplify a LineString geometry</title> - <link rel="stylesheet" href="../theme/default/style.css" type="text/css"> - <link rel="stylesheet" href="style.css" type="text/css"> - <style type="text/css"> - #map, #map-simplify { - height: 400px; - width: 400px; - margin: 5px !important; - float: left; - } - #info { - width: 300px; - float: left; - } - #docs { - clear: both; - } - </style> - </head> - <body> - <h1 id="title">Simplify a LineString geometry</h1> - <div id="tags"> - Douglas-Peucker, Douglas, Peucker, Peuker, tolerance - </div> - <p id="shortdesc"> - Shows the usage of the method "simplify" that implements - the Douglas-Peucker algorithm to remove "insignificant" - vertices from LineString geometries. - </p> - <div id="control-simplify"> - <label for="tolerance">Tolerance factor:</label> - <input name="tolerance" id="tolerance" type="number" min="0" max="1" step="0.02" value="0.1"> - <input type="button" id="simplify" value="Simplify LineString"> - <input type="button" id="animation" value="Start animation"> - </div> - <div id="map" class="smallmap"> - </div> - <div id="map-simplify" class="smallmap"> - </div> - <div id="info"> - </div> - <div id="docs"> - <p> - Instances of OpenLayers.Geometry.LineString have a method simplify, - that can be used to simplify linestring geometries. - Simplification sometimes is useful to enhance the perfomance of - vector rendering or to reduce complexity of geometries. This - might be especially handy when viewing geometries a small - scales. - </p> - <p> - OpenLayers.Geometry.LineString::simplify is a recursive - implementation of the famous Douglas-Peucker algorithm. It is - controlled by a tolerance factor that defines the threshold for - vertices to be considered "insignificant" for the - general structure of the geometry. - </p> - <p> - The LineString on the left map can be simplified according to - the tolerance value one enters in the form-field above the maps. - Use a value between 0 and 1 for best results. If you navigate - the left map, the right map will show the same location to make - it easier to spot the differeces between the LineStrings. - </p> - <p> - You can also use the button "Start animation" to get - results for increasing tolerance-factors from 0.02 to 1.0. The - animation can be paused by clicking on the button "Stop - animation". - </p> - <p> - The LineString represents a part of the coastline of - <a href="http://www.openstreetmap.org/?lat=54.7309684753418&lon=83.1809234619141&zoom=11">this - place southeast of Novosibirsk in Russia</a> — found via - <a href="http://ryba4.com/python/ramer-douglas-peucker">an - example implementation of the algorithm in python</a>. - </p> - <p> - For a detailled explanation of the algorithm see - <a href="http://en.wikipedia.org/wiki/Douglas-Peucker_algorithm">the - Wikipedia article</a> or the original publication: David Douglas - & Thomas Peucker, "Algorithms for the reduction of the - number of points required to represent a digitized line or its - caricature", The Canadian Cartographer 10(2), 112-122 (1973) - (<a href="http://dx.doi.org/10.3138/FM57-6770-U75U-7727">DOI: - 10.3138/FM57-6770-U75U-7727</a>). - </p> - <p>See <a href="simplify-linestring.js">simplify-linestring.js</a> - for the source code of this example.</p> - </div> - <script type="text/javascript" src="../lib/OpenLayers.js"> - </script> - <script type="text/javascript" src="./simplify-linestring.js"> - </script> - </body> -</html> |