带有“洞”的Google Maps API多边形在中心 [英] Google Maps API Polygon with "Hole" In Center

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本文介绍了带有“洞”的Google Maps API多边形在中心的处理方法,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

在另一个多边形内插入多边形应该在中心形成一个洞(请参阅​​Google地图五角大楼示例)。但是,我的程序一直没有做出一个漏洞,而是使两层多边形的线条变为insead。



http://cl.ly/1c243E1V1G2M1D3H3c0O < - 我的地图图片



有人说改变坐标顺序固定了它们所以我选择了Google在他们的例子中给出的百慕大三角形的坐标,但是,它遇到了我之前遇到过的同样的问题。相关代码如下:

  var everythingElse = [
new google.maps.LatLng(25.774252,-82.190262) ,
new google.maps.LatLng(17.466465,-65.118292),
new google.maps.LatLng(34.321384,-63.75737),
google.maps.LatLng(25.774252,-82.190262 )
];

var circleOverlay = [
new google.maps.LatLng(25.774252,-80.190262),
google.maps.LatLng(18.466465,-66.118292),
new google.maps.LatLng(32.321384,-64.75737),
new google.maps.LatLng(25.774252,-80.190262)
];

PropertySearch.tintPolygon = new google.maps.Polygon({
paths:[everythingElse,circleOverlay],
strokeColor:#000000,
strokeOpacity:0.8 ,
strokeWeight:2,
fillColor:#000000,
fillOpacity:0.5
});

PropertySearch.tintPolygon.setMap(PropertySearch.map);


解决方案

这确实是您指数方向的问题多边形,而其中一个是顺时针的,应该是逆时针的。
将您的第二个数组更改为:

  var circleOverlay = [
new google.maps.LatLng(25.774252 ,-80.190262),
new google.maps.LatLng(32.321384,-64.75737),//第二个和第三个坐标
new google.maps.LatLng(18.466465,-66.118292),//交换比较到原来的
新google.maps.LatLng(25.774252,-80.190262)
];

它会在您的三角形中显示一个不错的洞


Inserting a polygon inside another polygon is supposed to make a "hole" in the center (see the Google maps Pentagon example). However, my program keeps failing to make a hole and instead makes two layers of polygon lines insead.

http://cl.ly/1c243E1V1G2M1D3H3c0O <-- image of my map

Someone said changing the coordinate order fixed their problem so I selected exactly the coordinates of the bermuda triangle as given by Google in their example, however, it had the same problem I encountered before. The relevant code is below:

    var everythingElse = [
       new google.maps.LatLng(25.774252, -82.190262),
       new google.maps.LatLng(17.466465, -65.118292),
       new google.maps.LatLng(34.321384, -63.75737),
       new google.maps.LatLng(25.774252, -82.190262)
     ];

    var circleOverlay = [
       new google.maps.LatLng(25.774252, -80.190262),
       new google.maps.LatLng(18.466465, -66.118292),
       new google.maps.LatLng(32.321384, -64.75737),
       new google.maps.LatLng(25.774252, -80.190262)
     ];

    PropertySearch.tintPolygon = new google.maps.Polygon({
         paths: [ everythingElse, circleOverlay ],
        strokeColor: "#000000",
        strokeOpacity: 0.8,
        strokeWeight: 2,
        fillColor: "#000000",
        fillOpacity: 0.5
    });

    PropertySearch.tintPolygon.setMap(PropertySearch.map);

解决方案

It really is a matter of direction of indices in your polygons, while one is clockwise other should be counter-clockwise. Change your second array to:

var circleOverlay = [
   new google.maps.LatLng(25.774252, -80.190262),
   new google.maps.LatLng(32.321384, -64.75737),  //second and third coordinates
   new google.maps.LatLng(18.466465, -66.118292), //are swapped compared to your original
   new google.maps.LatLng(25.774252, -80.190262)
 ];

and it will display a nice hole in your triangle

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