Adding simple measure example
This commit is contained in:
Jachym Cepicky
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examples/measure.html
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65
examples/measure.html
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="../css/ol.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="../resources/layout.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
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<title>Measure example</title>
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</head>
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<body>
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<div class="navbar navbar-inverse navbar-fixed-top">
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<div class="navbar-inner">
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<div class="container">
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<a class="brand" href="./"><img src="../resources/logo.png"> OpenLayers 3 Examples</a>
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</div>
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</div>
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</div>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">Measure example</h4>
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<p id="shortdesc">Example of using the
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ol.interaction.Draw interaction for creating simple
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measuring application. </p>
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<form class="form-inline">
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<label>Geometry type </label>
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<select id="type">
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<option value="length">Length</option>
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<option value="area">Area</option>
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</select>
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</form>
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<ol id="measureOutput" reversed></ol>
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<div id="docs">
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<p><i>NOTE: Measure is done in simple way on projected plane. Earth
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curvature is not taken into account</i></p>
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<p>See the <a href="draw-features.js" target="_blank">measure.js source</a> to see how this is done.</p>
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</div>
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<div id="tags">draw, edit, measure, vector</div>
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</div>
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</div>
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</div>
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<script src="jquery.min.js" type="text/javascript"></script>
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<script src="../resources/example-behaviour.js" type="text/javascript"></script>
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<script src="loader.js?id=measure" type="text/javascript"></script>
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</body>
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</html>
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167
examples/measure.js
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167
examples/measure.js
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goog.require('ol.Map');
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goog.require('ol.View2D');
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goog.require('ol.geom.LineString');
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goog.require('ol.geom.Polygon');
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goog.require('ol.interaction');
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goog.require('ol.interaction.Draw');
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goog.require('ol.layer.Tile');
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goog.require('ol.layer.Vector');
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goog.require('ol.source.MapQuest');
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goog.require('ol.source.Vector');
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goog.require('ol.style.Circle');
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goog.require('ol.style.Fill');
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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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var raster = new ol.layer.Tile({
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source: new ol.source.MapQuest({layer: 'sat'})
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});
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var source = new ol.source.Vector();
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var vector = new ol.layer.Vector({
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source: source,
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style: new ol.style.Style({
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fill: new ol.style.Fill({
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color: 'rgba(255, 255, 255, 0.2)'
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}),
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stroke: new ol.style.Stroke({
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color: '#ffcc33',
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width: 2
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}),
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image: new ol.style.Circle({
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radius: 7,
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fill: new ol.style.Fill({
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color: '#ffcc33'
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})
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})
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})
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});
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/**
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* Currently drawed feature
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* @type {ol.Feature}
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*/
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var sketch;
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/**
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* Element for currently drawed feature
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* @type {Element}
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*/
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var sketchElement;
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/**
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* handle pointer move
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* @param {Event} evt
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*/
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var mouseMoveHandler = function(evt) {
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if (sketch) {
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var output;
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var geom = (sketch.getGeometry());
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if (geom instanceof ol.geom.Polygon) {
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output = formatArea(/** @type {ol.geom.Polygon} */ (geom));
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} else if (geom instanceof ol.geom.LineString) {
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output = formatLength( /** @type {ol.geom.LineString} */ (geom));
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}
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sketchElement.innerHTML = output;
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}
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};
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var map = new ol.Map({
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layers: [raster, vector],
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target: 'map',
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view: new ol.View2D({
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center: [-11000000, 4600000],
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zoom: 15
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})
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});
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$(map.getViewport()).on('mousemove', mouseMoveHandler);
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var typeSelect = document.getElementById('type');
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var draw; // global so we can remove it later
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function addInteraction() {
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var type = (typeSelect.value == 'area' ? 'Polygon' : 'LineString');
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draw = new ol.interaction.Draw({
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source: source,
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type: /** @type {ol.geom.GeometryType} */ (type)
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});
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map.addInteraction(draw);
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draw.on('drawstart',
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function(evt) {
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// set sketch
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sketch = evt.feature;
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sketchElement = document.createElement('li');
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var outputList = document.getElementById('measureOutput');
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if (outputList.childNodes) {
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outputList.insertBefore(sketchElement, outputList.firstChild);
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} else {
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outputList.appendChild(sketchElement);
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}
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}, this);
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draw.on('drawend',
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function(evt) {
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// unset sketch
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sketch = null;
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sketchElement = null;
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}, this);
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}
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/**
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* Let user change the geometry type.
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* @param {Event} e Change event.
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*/
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typeSelect.onchange = function(e) {
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map.removeInteraction(draw);
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addInteraction();
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};
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/**
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* format length output
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* @param {ol.geom.LineString} line
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* @return {string}
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*/
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var formatLength = function(line) {
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var length = Math.round(line.getLength() * 100) / 100;
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var output;
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if (length > 100) {
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output = (Math.round(length / 1000 * 100) / 100) +
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' ' + 'km';
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} else {
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output = (Math.round(length * 100) / 100) +
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' ' + 'm';
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}
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return output;
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};
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/**
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* format length output
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* @param {ol.geom.Polygon} polygon
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* @return {string}
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*/
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var formatArea = function(polygon) {
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var area = polygon.getArea();
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var output;
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if (area > 10000) {
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output = (Math.round(area / 1000000 * 100) / 100) +
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' ' + 'km<sup>2</sup>';
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} else {
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output = (Math.round(area * 100) / 100) +
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' ' + 'm<sup>2</sup>';
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}
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return output;
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};
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addInteraction();
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