我正在制作加拿大地图，其中包含省名的下拉列表。选择省份后，该区域将突出显示。但我也希望选择区域中心和缩放。我该如何存档？组成多边形的字段采用KML格式。如下所示：
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执行高光的代码：
function changeMap_1() {
var whereClause;
var searchString = document.getElementById('search-string_1').value.replace(/'/g, "\\'");
if (searchString != '--Select--') {
whereClause = "'Province' = '" + searchString + "'";
}
layer_1.setOptions({
query: {
select: "col0",
from: "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX(my map ID)",
where: whereClause
}
});
}
col0是KML信息。任何帮助表示赞赏。 TKS！
答案 0 :(得分：0)
一种方法是使用Google地球API的GEarthExtension Utility library来解析KML，然后计算几何边界和中心。
function initCB(instance) {
ge = instance;
gex = new GEarthExtensions(ge); // ge is an instance of GEPlugin
ge.getWindow().setVisibility(true);
}
function checkObject(kmlObject) {
var bounds = gex.dom.computeBounds(kmlObject); // Feature or Geometry
var pt = bounds.center();
// get center coordinates in lat/lon decimal degrees
var lat = pt.lat();
var lon = pt.lng();
// ...
}
如果你只想计算多边形的中心，那么这是一个免费的online center point tool。它计算中心并输出KML与该位置。只需使用多边形几何体粘贴KML即可。