OpenLayers学习笔记（六）— 拖拽叠加层overlayer
OpenLayers学习笔记（六）— 拖拽叠加层overlayer
是在官网例子基础上增加的拖拽功能
GitHub:八至
作者：狐狸家的鱼
本文链接：拖拽叠加层overlayer
全部代码
<!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,//自动更新位置
});
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;//减去偏移量
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>
posted @ 2018-12-28 17:16 狐狸家的鱼 阅读(…) 评论(…) 编辑 收藏
转载自：https://blog.csdn.net/sueRimn/article/details/86164301
