Google地图仅显示PA状态 [英] Google maps displaying just the state of PA
本文介绍了Google地图仅显示PA状态的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用JavaScript Google Maps API，并且希望将地图的显示区域限制为仅显示PA.我目前有一些kml数据用于显示PA中的县线.现在，我只需要使用户保持在PA状态即可.如何在javascript中对地图设置限制?
I am working with the javascript Google maps API and I am looking to restrict the viewing area of the map to only show PA. I currently have some kml data being used to display the county lines in PA. Now I just need to keep the user within the state of PA. How do I go about setting a restriction on the map in javascript?
我查找了有关漏洞的其他帖子?就像将PA从地图上切出一样，世界其他地方是一个多边形，其颜色发生了变化，然后PA仍然是主要焦点.我不知道如何实现这样的功能.我对使用Google Maps API感到很陌生.
I have looked up other posts regarding holes? Like cutting PA out of the map and the rest of the world is a polygon that gets its colored changed and then PA is still the main focus. I have no idea how to implement such a feature though. I am very new with working with Google Maps API.
推荐答案
- 获取该州边界的地理坐标源(一个源为 http://www.gadm.org ).
- 反转该多边形(
- get a source for the geographic coordinates for the state's boundaries (One source would be http://www.gadm.org).
- Invert that polygon (example) and display it on a Google Maps Javascript API v3 map (note that KmlLayer doesn't seem to handle KML with holes, so the example uses a third party KML parser).
- Restrict the map to the area of Pennsylvania
代码段(状态多边形简化为适合):
function initialize() {
var map = new google.maps.Map(
document.getElementById("map_canvas"), {
center: new google.maps.LatLng(37.4419, -122.1419),
zoom: 13,
minZoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var bounds = new google.maps.LatLngBounds(
new google.maps.LatLng(39.719429, -80.519562),
new google.maps.LatLng(42.267879, -74.690033));
google.maps.event.addListenerOnce(map, 'bounds_changed', function() {
var geoxml = new geoXML3.parser({
map: map,
zoom: false,
suppressInfoWindows: true,
});
geoxml.parseKmlString(PAstr);
var lastCenter = bounds.getCenter();
var polygon = new google.maps.Polygon({
path: geoxml.docs[0].gpolygons[0].getPaths().getAt(1)
});
google.maps.event.addListener(map, 'center_changed', function() {
var center = map.getCenter();
if (!google.maps.geometry.poly.containsLocation(center, polygon)) {
map.setCenter(lastCenter);
} else {
lastCenter = center;
}
});
});
map.fitBounds(bounds);
}
google.maps.event.addDomListener(window, "load", initialize);
var PAstr = '<?xml version="1.0" encoding="UTF-8"?><kml xmlns="http://earth.google.com/kml/2.2"><Document><name>United States divisions. Level 1</name><description><![CDATA[<a href="http://www.gadm.org">GADM</a> boundaries.]]></description><Style id="14"><LineStyle><width>1.5</width><color>ff000000</color></LineStyle><PolyStyle><color>FF6E6E6E</color><fill>1</fill></PolyStyle></Style><Placemark><name>Pennsylvania</name><description><![CDATA[State]]></description><styleUrl>#14</styleUrl><visibility>1</visibility><MultiGeometry><Polygon><outerBoundaryIs><LinearRing><coordinates>180,85 90,85 0,85 -90,85 -180,85 -180,0 -180,-85 -90,-85 0,-85 90,-85 180,-85 180,0 180,85</coordinates></LinearRing></outerBoundaryIs><innerBoundaryIs><LinearRing><coordinates>-79.7624969482421,42.2678794860841 -79.7633285522461,42.1857109069827 -79.7627868652343,42.0479621887208 -79.7625885009766,42.0206985473635 -79.7624206542968,41.9984512329102 -79.6110916137694,41.99813079834 -79.5225830078124,41.9979400634767 -79.2611694335937,41.9980888366699 -79.1505813598633,41.9985389709475 -79.0634460449219,41.9986991882325 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这篇关于Google地图仅显示PA状态的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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