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我升级到最新版本的 gmaps4rails (v2) 并且在绘制折线时遇到了一些问题。

我可以使用 wiki 上的示例代码获取标记，但如果我将 addMarkers 更改为 addPolylines，则地图中不会呈现任何内容。这是处理程序代码：

handler = Gmaps.build('Google');
handler.buildMap({ provider: {}, internal: {id: 'map'}}, function(){
polylines = handler.addPolylines([{"lat":45.678295,"lng":-121.603813,"ele":438.626221,"time":1381851321},{"lat":45.678196,"lng":-121.603607,"ele":423.202148,"time":1381851363},{"lat":45.678181,"lng":-121.603607,"ele":421.108398,"time":1381851373},{"lat":45.678162,"lng":-121.603584,"ele":420.153442,"time":1381851383},{"lat":45.678123,"lng":-121.603569,"ele":422.561096,"time":1381851393},{"lat":45.678165,"lng":-121.6036,"ele":425.191284,"time":1381851403},{"lat":45.678169,"lng":-121.603607,"ele":425.262329,"time":1381851413}]);
handler.bounds.extendWith(polylines);
handler.fitMapToBounds();
});

javascript 控制台中没有错误，只是没有地图渲染。有什么想法吗？

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1 回答 1

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有几件事：

  • 首先是我的 2.0.0 中的一个错误，我已经升级了 2.0.3

  • 那么你的解释中的一个问题：折线是一个纬度/经度数组，所以你的代码不能工作。

  • 谷歌没有提供任何方法来获取折线的边界，因此很难自动调整地图。

也就是说，你可以这样做：

polyline = [{"lat":45.678295,"lng":-121.603813,"ele":438.626221,"time":1381851321},{"lat":45.678196,"lng":-121.603607,"ele":423.202148,"time":1381851363},{"lat":45.678181,"lng":-121.603607,"ele":421.108398,"time":1381851373},{"lat":45.678162,"lng":-121.603584,"ele":420.153442,"time":1381851383},{"lat":45.678123,"lng":-121.603569,"ele":422.561096,"time":1381851393},{"lat":45.678165,"lng":-121.6036,"ele":425.191284,"time":1381851403},{"lat":45.678169,"lng":-121.603607,"ele":425.262329,"time":1381851413}]

handler.addPolyline(polyline); // and not addPolylines
handler.bounds.extend(polyline[0]);
handler.bounds.extend(polyline[ polyline.length - 1]);
handler.fitMapToBounds();

你最终会得到：在此处输入图像描述

于 2013-10-24T08:02:48.367 回答