Example sources in the examples dir
This commit is contained in:
Tim Schaub
298
examples/measure.js
Normal file
298
examples/measure.js
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goog.require('ol.Map');
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goog.require('ol.Overlay');
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goog.require('ol.Sphere');
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goog.require('ol.View');
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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.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.proj');
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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 wgs84Sphere = new ol.Sphere(6378137);
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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 drawn 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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* The help tooltip element.
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* @type {Element}
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*/
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var helpTooltipElement;
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/**
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* Overlay to show the help messages.
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* @type {ol.Overlay}
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*/
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var helpTooltip;
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/**
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* The measure tooltip element.
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* @type {Element}
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*/
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var measureTooltipElement;
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/**
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* Overlay to show the measurement.
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* @type {ol.Overlay}
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*/
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var measureTooltip;
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/**
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* Message to show when the user is drawing a polygon.
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* @type {string}
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*/
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var continuePolygonMsg = 'Click to continue drawing the polygon';
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/**
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* Message to show when the user is drawing a line.
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* @type {string}
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*/
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var continueLineMsg = 'Click to continue drawing the line';
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/**
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* Handle pointer move.
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* @param {ol.MapBrowserEvent} evt
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*/
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var pointerMoveHandler = function(evt) {
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if (evt.dragging) {
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return;
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}
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/** @type {string} */
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var helpMsg = 'Click to start drawing';
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/** @type {ol.Coordinate|undefined} */
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var tooltipCoord = evt.coordinate;
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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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helpMsg = continuePolygonMsg;
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tooltipCoord = geom.getInteriorPoint().getCoordinates();
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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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helpMsg = continueLineMsg;
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tooltipCoord = geom.getLastCoordinate();
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}
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measureTooltipElement.innerHTML = output;
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measureTooltip.setPosition(tooltipCoord);
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}
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helpTooltipElement.innerHTML = helpMsg;
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helpTooltip.setPosition(evt.coordinate);
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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.View({
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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.on('pointermove', pointerMoveHandler);
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var typeSelect = document.getElementById('type');
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var geodesicCheckbox = document.getElementById('geodesic');
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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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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: 'rgba(0, 0, 0, 0.5)',
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lineDash: [10, 10],
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width: 2
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}),
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image: new ol.style.Circle({
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radius: 5,
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stroke: new ol.style.Stroke({
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color: 'rgba(0, 0, 0, 0.7)'
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}),
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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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})
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})
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});
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map.addInteraction(draw);
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createMeasureTooltip();
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createHelpTooltip();
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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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}, this);
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draw.on('drawend',
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function(evt) {
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measureTooltipElement.className = 'tooltip tooltip-static';
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measureTooltip.setOffset([0, -7]);
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// unset sketch
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sketch = null;
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// unset tooltip so that a new one can be created
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measureTooltipElement = null;
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createMeasureTooltip();
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}, this);
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}
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/**
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* Creates a new help tooltip
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*/
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function createHelpTooltip() {
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if (helpTooltipElement) {
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helpTooltipElement.parentNode.removeChild(helpTooltipElement);
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}
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helpTooltipElement = document.createElement('div');
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helpTooltipElement.className = 'tooltip';
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helpTooltip = new ol.Overlay({
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element: helpTooltipElement,
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offset: [15, 0],
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positioning: 'center-left'
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});
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map.addOverlay(helpTooltip);
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}
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/**
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* Creates a new measure tooltip
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*/
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function createMeasureTooltip() {
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if (measureTooltipElement) {
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measureTooltipElement.parentNode.removeChild(measureTooltipElement);
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}
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measureTooltipElement = document.createElement('div');
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measureTooltipElement.className = 'tooltip tooltip-measure';
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measureTooltip = new ol.Overlay({
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element: measureTooltipElement,
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offset: [0, -15],
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positioning: 'bottom-center'
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});
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map.addOverlay(measureTooltip);
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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;
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if (geodesicCheckbox.checked) {
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var coordinates = line.getCoordinates();
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length = 0;
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var sourceProj = map.getView().getProjection();
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for (var i = 0, ii = coordinates.length - 1; i < ii; ++i) {
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var c1 = ol.proj.transform(coordinates[i], sourceProj, 'EPSG:4326');
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var c2 = ol.proj.transform(coordinates[i + 1], sourceProj, 'EPSG:4326');
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length += wgs84Sphere.haversineDistance(c1, c2);
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}
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} else {
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length = Math.round(line.getLength() * 100) / 100;
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}
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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;
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if (geodesicCheckbox.checked) {
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var sourceProj = map.getView().getProjection();
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var geom = /** @type {ol.geom.Polygon} */(polygon.clone().transform(
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sourceProj, 'EPSG:4326'));
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var coordinates = geom.getLinearRing(0).getCoordinates();
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area = Math.abs(wgs84Sphere.geodesicArea(coordinates));
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} else {
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area = polygon.getArea();
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}
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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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