1. 程式人生 > >OpenLayers學習筆記(六)— 拖拽疊加層overlayer

OpenLayers學習筆記(六)— 拖拽疊加層overlayer

是在官網例子基礎上增加的拖拽功能

GitHub:八至

作者:狐狸家的魚

本文連結:拖拽疊加層overlayer

全部程式碼

<!DOCTYPE html>
<html>
  <head>
    <title>Icon Symbolizer</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/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/v3.20.1/build/ol.js"></script> <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script> <style> #map { position: relative; } #popup { cursor: pointer; } .popupStyle{ position:relative; width:100px; height:100px; text
-align:center; line-height:100px; color:white; background-color:rgba(0,0,0,0.4); } </style> </head> <body> <div id="map" class="map"></div> <div id="popup"><div class="popupStyle">Null Island</div></div> <script> var
element = document.getElementById('popup'); var iconFeature = new ol.Feature({ geometry: new ol.geom.Point([0, 0]), name: 'Null Island' }); var lineStyle = new ol.style.Style({ stroke: new ol.style.Stroke({ color: '#ffcc33', width: 3, lineDash:[10,10] }) }); var line = new ol.geom.LineString([0,0],[0,0]); var lineFeature = new ol.Feature(line); var iconStyle = new ol.style.Style({ image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({ anchor: [0.5, 46], anchorXUnits: 'fraction', anchorYUnits: 'pixels', src: 'https://openlayers.org/en/v3.20.1/examples/data/icon.png' })) }); iconFeature.setStyle(iconStyle); var vectorSource = new ol.source.Vector({ features: [iconFeature,lineFeature] }); var vectorLayer = new ol.layer.Vector({ source: vectorSource, style:[lineStyle], updateWhileInteracting: true,//自動更新位置 }); var rasterLayer = new ol.layer.Tile({ source: new ol.source.TileJSON({ url: 'https://api.tiles.mapbox.com/v3/mapbox.geography-class.json?secure', crossOrigin: '' }) }); var map = new ol.Map({ layers: [rasterLayer, vectorLayer], target: document.getElementById('map'), view: new ol.View({ center: [0, 0], zoom: 3 }) }); var popup = new ol.Overlay({ element: element, positioning: 'bottom-center', stopEvent: false, dragging: false, offset: [0, -50] }); popup.setPosition([0,0]); map.addOverlay(popup); // display popup on click var dragPan; map.getInteractions().forEach(function(interaction){ if (interaction instanceof ol.interaction.DragPan) { dragPan = interaction; } }); element.addEventListener('mousedown', function(evt) { dragPan.setActive(false); popup.set('dragging', true); console.info('start dragging'); }); // var translateLine = new ol.interaction.Translate({ // //features:new ol.Collection([lineFeature]) // layers:new ol.Collection([popup]) // }); // map.addInteraction(translateLine); // var coord; // translateLine.on('translatestart',function (evt){ // coord = popup.getCoordinates(); // }); // translateLine.on('translating', function (evt) { // line.setCoordinates([coord, evt.coordinate]); // }); map.on('pointermove', function(evt) { var startPoint=iconFeature.getGeometry().getCoordinates(); if (popup.get('dragging')) { var dd2=map.getPixelFromCoordinate(evt.coordinate); var newX=dd2[0]-0;//減去偏移量 var newY=dd2[1]-(-50); var newPoint=map.getCoordinateFromPixel([newX,newY]); popup.setPosition(newPoint); lineFeature.getGeometry().setCoordinates([startPoint,evt.coordinate]); // } } }); map.on('pointerup', function(evt) { if (popup.get('dragging') === true) { console.info('stop dragging'); dragPan.setActive(true); popup.set('dragging', false); } }); </script> </body> </html>