Javascript 在html地图中拖动线条并显示线条之间的差异
我一直在检查关于这个话题的不同问题,但没有一个能给我一个令人信服的答案。我有一张地图,通过以下操作绘制了4个轴:Javascript 在html地图中拖动线条并显示线条之间的差异,javascript,html,css,google-maps,google-maps-api-3,Javascript,Html,Css,Google Maps,Google Maps Api 3,我一直在检查关于这个话题的不同问题,但没有一个能给我一个令人信服的答案。我有一张地图,通过以下操作绘制了4个轴: function axis() { var bounds = map.getBounds(); var NECorner = bounds.getNorthEast(); var SWCorner = bounds.getSouthWest(); // horizontal top axis var PolylineCoordinates
function axis() {
var bounds = map.getBounds();
var NECorner = bounds.getNorthEast();
var SWCorner = bounds.getSouthWest();
// horizontal top axis
var PolylineCoordinates = [
new google.maps.LatLng(NECorner.lat()-0.0002, NECorner.lng()),
new google.maps.LatLng(NECorner.lat()-0.0002, SWCorner.lng()),
];
var Path = new google.maps.Polyline({
clickable: false,
geodesic: true,
path: PolylineCoordinates,
strokeColor: "#FF0000",
strokeOpacity: 1.000000,
strokeWeight: 0.8
});
Path.setMap(map);
// horizontal low axis
var PolylineCoordinates = [
new google.maps.LatLng(SWCorner.lat()+0.0002, NECorner.lng()),
new google.maps.LatLng(SWCorner.lat()+0.0002, SWCorner.lng()),
];
var Path = new google.maps.Polyline({
clickable: false,
geodesic: true,
path: PolylineCoordinates,
strokeColor: "#FF0000",
strokeOpacity: 1.000000,
strokeWeight: 0.8
});
Path.setMap(map);
// vertical left axis
var PolylineCoordinates = [
new google.maps.LatLng(NECorner.lat(), SWCorner.lng()+0.0002),
new google.maps.LatLng(SWCorner.lat(), SWCorner.lng()+0.0002),
];
var Path = new google.maps.Polyline({
clickable: false,
geodesic: true,
path: PolylineCoordinates,
strokeColor: "#FF0000",
strokeOpacity: 1.000000,
strokeWeight: 0.8
});
Path.setMap(map);
// vertical left axis
var PolylineCoordinates = [
new google.maps.LatLng(NECorner.lat(), NECorner.lng()-0.0002),
new google.maps.LatLng(SWCorner.lat(), NECorner.lng()-0.0002),
];
var Path = new google.maps.Polyline({
clickable: false,
geodesic: true,
path: PolylineCoordinates,
strokeColor: "#FF0000",
strokeOpacity: 1.000000,
strokeWeight: 0.8
});
Path.setMap(map);
}
我现在想要的是能够水平或垂直拖动这些轴(取决于轴),并不断获得它们之间的位置差(一方面是水平面之间,另一方面是垂直面之间)
我的输出是:
如果问题不够清楚,我想:
-能够通过鼠标拖动四条红线来移动/扫掠它们
-在地图上方显示:abs(纬度_轴1-纬度轴2)和abs(经度_轴1-经度轴2)的值
有人能帮我吗?如果没有,是否有人知道已经回答了类似的问题(我想我已经全部检查过了)我的代码不是虚拟的,就像它不会阻止用户在南线下走北线,也不可能把线拖得太远 但这(或多或少)是你所要求的 替换API密钥 编辑:请注意,在第46行中,您可以将“dragend”更改为“drag”。然后在用户拖动时更改显示
<!DOCTYPE html>
<html>
<head>
<title>drag lines in html map and display difference between lines</title>
<meta name="viewport" content="initial-scale=1.0">
<meta charset="utf-8">
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 90%;
}
</style>
</head>
<body>
<div id="map"></div>
<div id="log"></div>
<div id="info">
<a href="http://stackoverflow.com/questions/39370766/drag-lines-in-html-map-and-display-difference-between-lines/39376480#39376480">Stackoverflow</a>
</div>
<script type="text/javascript" src="https://maps.google.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry"></script>
<script>
var map;
var initialViewportCoordinates = {
north: 51.0,
east: 5.0,
south: 50.0,
west: 3.0
};
var extraDegrees = 10; // the lines will extend 10 degrees (which is pretty much)
var lineObjects = [];
function drawPolyline(path, color) {
var line = new google.maps.Polyline({
path: path,
draggable: true,
strokeColor: color,
strokeOpacity: 0.9,
strokeWeight: 3
});
line.setMap(map);
// drag event
google.maps.event.addDomListener(line, 'dragend', function(e) {
// find out which line is being dragged
var index = lineObjects.indexOf(this);
// update initialViewportCoordinates
switch(index) {
case 0: initialViewportCoordinates.north = e.latLng.lat(); break;
case 1: initialViewportCoordinates.east = e.latLng.lng(); break;
case 2: initialViewportCoordinates.south = e.latLng.lat(); break;
case 3: initialViewportCoordinates.west = e.latLng.lng(); break;
}
displayDifference();
});
return line;
}
function displayDifference() {
document.getElementById('log').innerHTML =
'difference lat: ' + (initialViewportCoordinates.north - initialViewportCoordinates.south) + '<br/>' +
'difference lng: ' + (initialViewportCoordinates.east - initialViewportCoordinates.west)
;
}
function drawViewport() {
var north = [
{lat: initialViewportCoordinates.north , lng: initialViewportCoordinates.east + extraDegrees},
{lat: initialViewportCoordinates.north, lng: initialViewportCoordinates.west - extraDegrees}
];
var east = [
{lat: initialViewportCoordinates.north + extraDegrees , lng: initialViewportCoordinates.east},
{lat: initialViewportCoordinates.south - extraDegrees, lng: initialViewportCoordinates.east}
];
var south = [
{lat: initialViewportCoordinates.south , lng: initialViewportCoordinates.east + extraDegrees},
{lat: initialViewportCoordinates.south, lng: initialViewportCoordinates.west - extraDegrees}
];
var west = [
{lat: initialViewportCoordinates.north + extraDegrees , lng: initialViewportCoordinates.west},
{lat: initialViewportCoordinates.south - extraDegrees, lng: initialViewportCoordinates.west}
];
// we will genetate the lines and store the resulting objects in this array
lineObjects = [
drawPolyline(north, '#ff0000'),
drawPolyline(east, '#ff0000'),
drawPolyline(south, '#ff0000'),
drawPolyline(west, '#ff0000')
];
}
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 50.84, lng: 4.35},
zoom: 7,
mapTypeId: 'terrain'
});
drawViewport();
displayDifference();
}
google.maps.event.addDomListener(window, 'load', initMap);
</script>
</body>
</html>
在html地图中拖动线条并显示线条之间的差异
html,正文{
身高:100%;
保证金:0;
填充:0;
}
#地图{
身高:90%;
}
var映射;
变量initialViewportCoordinates={
北:51.0,
东部:5.0,
南部:50.0,
西部:3.0
};
var extraDegrees=10;//这些线将延伸10度(相当于)
var lineObjects=[];
函数drawPolyline(路径、颜色){
var line=新的google.maps.Polyline({
路径:路径,
真的,
strokeColor:颜色,
笔划不透明度:0.9,
冲程重量:3
});
line.setMap(map);
//拖动事件
google.maps.event.addDomListener(行'dragend',函数(e){
//找出正在拖动的线
var index=lineObjects.indexOf(this);
//更新初始视口坐标
开关(索引){
案例0:initialViewportCoordinates.north=e.latLng.lat();中断;
案例1:initialViewportCoordinates.east=e.latLng.lng();中断;
案例2:initialViewportCoordinates.south=e.latLng.lat();break;
案例3:initialViewportCoordinates.west=e.latLng.lng();break;
}
显示差异();
});
回流线;
}
函数displayDifference(){
document.getElementById('log')。innerHTML=
“差异纬度:”+(initialViewportCoordinates.north-initialViewportCoordinates.south)+“
”+
“差异:”+(initialViewportCoordinates.east-initialViewportCoordinates.west)
;
}
函数drawViewport(){
var north=[
{lat:initialViewportCoordinates.north,lng:initialViewportCoordinates.east+extraDegrees},
{lat:initialViewportCoordinates.north,lng:initialViewportCoordinates.west-额外度数}
];
var east=[
{lat:initialViewportCoordinates.north+额外度数,lng:initialViewportCoordinates.east},
{lat:initialViewportCoordinates.south-额外度数,lng:initialViewportCoordinates.east}
];
var south=[
{lat:initialViewportCoordinates.south,lng:initialViewportCoordinates.east+extraDegrees},
{lat:initialViewportCoordinates.south,lng:initialViewportCoordinates.west-extradeges}
];
var west=[
{lat:initialViewportCoordinates.north+额外度数,lng:initialViewportCoordinates.west},
{lat:initialViewportCoordinates.south-额外度数,lng:initialViewportCoordinates.west}
];
//我们将生成线并将生成的对象存储在此数组中
lineObjects=[
绘图多段线(北,#ff0000'),
图纸多段线(东,#ff0000'),
绘图多段线(南,#ff0000'),
绘图多段线(西,#ff0000')
];
}
函数initMap(){
map=new google.maps.map(document.getElementById('map'){
中心:{lat:50.84,lng:4.35},
缩放:7,
mapTypeId:'地形'
});
drawViewport();
显示差异();
}
google.maps.event.addDomListener(窗口'load',initMap);
你所说的“获得位置差异”是什么意思?你到底想拖什么?完整的行/路径还是仅点?@Dekel我对问题进行了一点编辑,请检查。非常感谢!这很好用。当检测到任何缩放时,我只需调整轴的大小,我就会完成。你真的很有帮助!