函数ol.proj.transform()根据用户输入返回错误的坐标。为了测试目的,我设置为50.7712078,9.6679688。
当它们通过值传递给函数(add_marker(y,x))时,结果为:
1076233.3638212564,-4754497.267923687
但是,当我创建代表与用户输入相同的纬度和经度的局部变量时
这给了我:
1076233.3638212564,6580922.381627579
ol3中的此功能是否有问题?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; carset=utf-8">
<link rel="stylesheet" href="./_css_II.css" type="text/css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.5.0/ol.js" type="text/javascript"></script>
<script src="./_script.js" type="text/javascript"></script>
</head>
<body>
<div id="map" class="map"></div>
<div id="geo-marker" class="marker"></div>
<div id="inputForm">
Latitude:
<input id="latitude" type="text" value="50.7712078"/>//default
Longitude:
<input id="longitude" type="text" value="9.6679688"/>//default
<input id="btn_addmarker" type="button" value="Add Marker" />
</div>
</body>
</html>
_script.js
var map, marker;
$(document).ready(function(){
init_map();
$("#btn_addmarker").on("click",function(){
var lat = $("#latitude").val();
var lon = $("#longitude").val();
add_marker(lon,lat);
});
});
function init_map(){
var OSM = new ol.layer.Tile({
source: new ol.source.OSM()
});
var v_OSM = new ol.View({
center:[2061969,7281059],
zoom: 14
});
var map = new ol.Map({
layers: [OSM],
target: "map",
renderer: "canvas",
view: v_OSM
});
var markerHwnd = document.getElementById("geo-marker");
marker = new ol.Overlay({
position: [2061961,7281059],
positioning: "bottom-center",
offset: [0,0],
element: markerHwnd,
stopEvent: false
});
map.addOverlay(marker);
}
function add_marker(y,x){
var goodLat = 50.7712078;
var goodLon = 9.6679688;
var newCoord = ol.proj.transform([y,x],"EPSG:4326","EPSG:3857");
console.log(newCoord); //[1076233.3638212564, -4754497.267923687] <- Should be: [1076233.3638212564, 6580922.381627579]
/*
var newCoord = ol.proj.transform([goodLon,goodLat],"EPSG:4326","EPSG:3857");
console.log(newCoord);//[1076233.3638212564, 6580922.381627579] <- OK!
*/
marker.setPosition(newCoord);
}
最佳答案
您正在传递文本作为参数。
调用方法以使其正确时,显式解析参数:
add_marker(parseFloat(lon),parseFloat(lat));
关于javascript - ol3 ol.proj.transform错误的转换,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/37208969/