84 lines
2.1 KiB
JavaScript
84 lines
2.1 KiB
JavaScript
goog.require('ol.FeatureOverlay');
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goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.events.condition');
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goog.require('ol.interaction.Draw');
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goog.require('ol.interaction.Modify');
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goog.require('ol.layer.Tile');
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goog.require('ol.source.MapQuest');
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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 map = new ol.Map({
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layers: [raster],
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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: 4
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})
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});
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// The features are not added to a regular vector layer/source,
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// but to a feature overlay which holds a collection of features.
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// This collection is passed to the modify and also the draw
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// interaction, so that both can add or modify features.
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var featureOverlay = new ol.FeatureOverlay({
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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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featureOverlay.setMap(map);
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var modify = new ol.interaction.Modify({
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features: featureOverlay.getFeatures(),
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// the SHIFT key must be pressed to delete vertices, so
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// that new vertices can be drawn at the same position
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// of existing vertices
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deleteCondition: function(event) {
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return ol.events.condition.shiftKeyOnly(event) &&
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ol.events.condition.singleClick(event);
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}
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});
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map.addInteraction(modify);
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var draw; // global so we can remove it later
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function addInteraction() {
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draw = new ol.interaction.Draw({
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features: featureOverlay.getFeatures(),
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type: /** @type {ol.geom.GeometryType} */ (typeSelect.value)
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});
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map.addInteraction(draw);
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}
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var typeSelect = document.getElementById('type');
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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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addInteraction();
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