<!DOCTYPE html> <html> <head> <title>Custom Interactions</title> <link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css"> <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --> <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script> <script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script> </head> <body> <div id="map" class="map"></div> <script> /** * Define a namespace for the application. */ var app = {}; /** * @constructor * @extends {ol.interaction.Pointer} */ app.Drag = function() { ol.interaction.Pointer.call(this, { handleDownEvent: app.Drag.prototype.handleDownEvent, handleDragEvent: app.Drag.prototype.handleDragEvent, handleMoveEvent: app.Drag.prototype.handleMoveEvent, handleUpEvent: app.Drag.prototype.handleUpEvent }); /** * @type {ol.Pixel} * @private */ this.coordinate_ = null; /** * @type {string|undefined} * @private */ this.cursor_ = 'pointer'; /** * @type {ol.Feature} * @private */ this.feature_ = null; /** * @type {string|undefined} * @private */ this.previousCursor_ = undefined; }; ol.inherits(app.Drag, ol.interaction.Pointer); /** * @param {ol.MapBrowserEvent} evt Map browser event. * @return {boolean} `true` to start the drag sequence. */ app.Drag.prototype.handleDownEvent = function(evt) { var map = evt.map; var feature = map.forEachFeatureAtPixel(evt.pixel, function(feature) { return feature; }); if (feature) { this.coordinate_ = evt.coordinate; this.feature_ = feature; } return !!feature; }; /** * @param {ol.MapBrowserEvent} evt Map browser event. */ app.Drag.prototype.handleDragEvent = function(evt) { var deltaX = evt.coordinate[0] - this.coordinate_[0]; var deltaY = evt.coordinate[1] - this.coordinate_[1]; var geometry = /** @type {ol.geom.SimpleGeometry} */ (this.feature_.getGeometry()); geometry.translate(deltaX, deltaY); this.coordinate_[0] = evt.coordinate[0]; this.coordinate_[1] = evt.coordinate[1]; }; /** * @param {ol.MapBrowserEvent} evt Event. */ app.Drag.prototype.handleMoveEvent = function(evt) { if (this.cursor_) { var map = evt.map; var feature = map.forEachFeatureAtPixel(evt.pixel, function(feature) { return feature; }); var element = evt.map.getTargetElement(); if (feature) { if (element.style.cursor != this.cursor_) { this.previousCursor_ = element.style.cursor; element.style.cursor = this.cursor_; } } else if (this.previousCursor_ !== undefined) { element.style.cursor = this.previousCursor_; this.previousCursor_ = undefined; } } }; /** * @return {boolean} `false` to stop the drag sequence. */ app.Drag.prototype.handleUpEvent = function() { this.coordinate_ = null; this.feature_ = null; return false; }; var pointFeature = new ol.Feature(new ol.geom.Point([0, 0])); var lineFeature = new ol.Feature( new ol.geom.LineString([[-1e7, 1e6], [-1e6, 3e6]])); var polygonFeature = new ol.Feature( new ol.geom.Polygon([[[-3e6, -1e6], [-3e6, 1e6], [-1e6, 1e6], [-1e6, -1e6], [-3e6, -1e6]]])); var map = new ol.Map({ interactions: ol.interaction.defaults().extend([new app.Drag()]), layers: [ new ol.layer.Tile({ source: new ol.source.TileJSON({ url: 'https://api.tiles.mapbox.com/v3/mapbox.geography-class.json?secure' }) }), new ol.layer.Vector({ source: new ol.source.Vector({ features: [pointFeature, lineFeature, polygonFeature] }), style: new ol.style.Style({ image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({ anchor: [0.5, 46], anchorXUnits: 'fraction', anchorYUnits: 'pixels', opacity: 0.95, src: 'https://openlayers.org/en/v4.0.1/examples/data/icon.png' })), stroke: new ol.style.Stroke({ width: 3, color: [255, 0, 0, 1] }), fill: new ol.style.Fill({ color: [0, 0, 255, 0.6] }) }) }) ], target: 'map', view: new ol.View({ center: [0, 0], zoom: 2 }) }); </script> </body> </html>
OpenLayers示例代码:自定义互动
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