168 lines
3.6 KiB
JavaScript
168 lines
3.6 KiB
JavaScript
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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