25

我有 4 天的 Google Maps Javascript API 经验，我发现他们的文档和信息共享充其量是令人困惑的。

有没有人有关于如何在类似于这个例子的谷歌地图（使用 Javascript API V3）上绘制多边形/折线的经验或知识？（我在 2008 年的这篇博文中发现）

据我的研究可以告诉我，该示例​​直接使用 Javascript API V2 或使用 V2 中的 GeometryControl 实用程序库（可在此处找到以供参考）。我似乎无法找到 Javascript API V3 是否有任何方式允许这样的接口。

我将继续我的研究，但如果有任何有用的评论或链接或建议，我将不胜感激。即使您为我指明了进一步研究的正确方向。:)

4

6 回答 6

22

经过大量研究，我遇到了这个例子。在发现它并用谷歌搜索它之后，它似乎是对像我这样的问题的一般答案。根据 V3 API，这是非常基本但正确的。

使用此示例中的代码，我成功地构建了我需要的原型。该代码是基本的，但我发现可以对其进行扩展以更好地适应我的规范，这很好。

我在评论中提供的对 plexer 答案的链接将是最好的解决方案，但开发它的人表示它仍在开发中，因此不够稳定，无法在发布应用程序中使用。

于 2010-08-11T08:55:42.623 回答
12

对于 Google Maps v3.7，您可以使用绘图库

另一个不错的库： ryshkin@gmail.com的 polygonEdit /polylineEdit

于 2011-12-16T03:23:49.443 回答
5

看看我的曲线脚本： http ://curved_lines.overfx.net/

以下是我使用的功能：

function curved_line_generate(LatStart, LngStart, LatEnd, LngEnd, Color, Horizontal, Multiplier) {

  var LastLat = LatStart;
  var LastLng = LngStart;

  var PartLat;
  var PartLng;

  var Points = new Array(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9);
  var PointsOffset = new Array(0.2, 0.35, 0.5, 0.55, 0.60, 0.55, 0.5, 0.35, 0.2);

  var OffsetMultiplier = 0;

  if (Horizontal == 1) {
    var OffsetLenght = (LngEnd - LngStart) * 0.1;
  } else {
    var OffsetLenght = (LatEnd - LatStart) * 0.1;
  }

  for (var i = 0; i < Points.length; i++) {
    if (i == 4) {
      OffsetMultiplier = 1.5 * Multiplier;
    }

    if (i >= 5) {
      OffsetMultiplier = (OffsetLenght * PointsOffset[i]) * Multiplier;
    } else {
      OffsetMultiplier = (OffsetLenght * PointsOffset[i]) * Multiplier;
    }

    if (Horizontal == 1) {
      PartLat = (LatStart + ((LatEnd - LatStart) * Points[i])) + OffsetMultiplier;
      PartLng = (LngStart + ((LngEnd - LngStart) * Points[i]));
    } else {
      PartLat = (LatStart + ((LatEnd - LatStart) * Points[i]));
      PartLng = (LngStart + ((LngEnd - LngStart) * Points[i])) + OffsetMultiplier;
    }

    curved_line_create_segment(LastLat, LastLng, PartLat, PartLng, Color);

    LastLat = PartLat;
    LastLng = PartLng;
  }

  curved_line_create_segment(LastLat, LastLng, LatEnd, LngEnd, Color);

}

function curved_line_create_segment(LatStart, LngStart, LatEnd, LngEnd, Color) {
  var LineCordinates = new Array();

  LineCordinates[0] = new google.maps.LatLng(LatStart, LngStart);
  LineCordinates[1] = new google.maps.LatLng(LatEnd, LngEnd);

  var Line = new google.maps.Polyline({
    path: LineCordinates,
    geodesic: false,
    strokeColor: Color,
    strokeOpacity: 1,
    strokeWeight: 3
  }); 

  Line.setMap(map);
}

这是您的 html 内容 + 初始化脚本：

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript">

  var map;
  google.maps.event.addDomListener(window, 'load', initialize);

  function initialize() {

    /* Create Google Map */ 

    var myOptions = {
      zoom: 6,
      center: new google.maps.LatLng(41, 19.6),
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    map = new google.maps.Map(document.getElementById('map_canvas'), myOptions);

    /* Add Sample Lines */

    /* Sofia - Burgas */
    curved_line_generate(42.68243562027229, 23.280029421875042, 42.488302202180364, 27.432861453125042,"#F00", true, 1);

    /* Sofia - Varna */
    curved_line_generate(42.68243562027229, 23.280029421875042, 43.19716750254011, 27.894287234375042,"#1a8809", true, 1);

    /* Ancona - Sofia */
    curved_line_generate(43.61221698671215, 13.458252078125042,42.68243562027229, 23.280029421875042, "#00F", true, 1);

    /* Sofia - Florence */
    curved_line_generate(42.68243562027229, 23.280029421875042, 43.73935229722859, 11.217041140625042,"#666", true, 1);

    /* Sofia - Athens */
    curved_line_generate(42.68243562027229, 23.280029421875042, 37.97884527841534, 23.719482546875042,"#ffa200", false, 2);
  }

</script>
于 2012-01-29T12:53:29.290 回答
4

从 Maps API v3 示例页面看一下这个示例：

http://code.google.com/apis/maps/documentation/javascript/examples/polyline-complex.html

该代码监听地图上的点击，并在每次点击时将额外的纬度/经度对添加到折线数组中。这会产生一条连接每个单击点的折线。

将此扩展到多边形应该相对简单。在某些时候，您需要关闭多边形。您可以通过单击多边形或标记（指示交叉点）或通过用户可以单击的按钮并将多边形设置为自动关闭来做到这一点。

于 2010-08-05T05:00:16.813 回答
3

我发现这个很容易..您可以绘制多边形，可以找到它们的长度并且非常容易.. http://geojason.info/demos/line-length-polygon-area-google-maps-v3/

这是一些代码，以防链接出现故障。

var map;

// Create a meausure object to store our markers, MVCArrays, lines and polygons
var measure = {
  mvcLine: new google.maps.MVCArray(),
  mvcPolygon: new google.maps.MVCArray(),
  mvcMarkers: new google.maps.MVCArray(),
  line: null,
  polygon: null
};

// When the document is ready, create the map and handle clicks on it
jQuery(document).ready(function() {

  map = new google.maps.Map(document.getElementById("map"), {
    zoom: 15,
    center: new google.maps.LatLng(39.57592, -105.01476),
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    draggableCursor: "crosshair" // Make the map cursor a crosshair so the user thinks they should click something
  });

  google.maps.event.addListener(map, "click", function(evt) {
    // When the map is clicked, pass the LatLng obect to the measureAdd function
    measureAdd(evt.latLng);
  });

});

function measureAdd(latLng) {

  // Add a draggable marker to the map where the user clicked
  var marker = new google.maps.Marker({
      map: map,
      position: latLng,
      draggable: true,
      raiseOnDrag: false,
      title: "Drag me to change shape",
      icon: new google.maps.MarkerImage(
        "/images/demos/markers/measure-vertex.png", 
        new google.maps.Size(9, 9),
        new google.maps.Point(0, 0),
        new google.maps.Point(5, 5)
      )
  });

  // Add this LatLng to our line and polygon MVCArrays
  // Objects added to these MVCArrays automatically update the line and polygon shapes on the map
  measure.mvcLine.push(latLng);
  measure.mvcPolygon.push(latLng);

  // Push this marker to an MVCArray
  // This way later we can loop through the array and remove them when measuring is done
  measure.mvcMarkers.push(marker);

  // Get the index position of the LatLng we just pushed into the MVCArray
  // We'll need this later to update the MVCArray if the user moves the measure vertexes
  var latLngIndex = measure.mvcLine.getLength() - 1;

  // When the user mouses over the measure vertex markers, change shape and color to make it obvious they can be moved
  google.maps.event.addListener(marker, "mouseover", function() {
    marker.setIcon(
      new google.maps.MarkerImage("/images/demos/markers/measure-vertex-hover.png",
        new google.maps.Size(15, 15), 
        new google.maps.Point(0, 0), 
        new google.maps.Point(8, 8)
      )
    );
  });

  // Change back to the default marker when the user mouses out
  google.maps.event.addListener(marker, "mouseout", function() {
    marker.setIcon(
      new google.maps.MarkerImage(
        "/images/demos/markers/measure-vertex.png",
        new google.maps.Size(9, 9),
        new google.maps.Point(0, 0),
        new google.maps.Point(5, 5)
      )
    );
  });

  // When the measure vertex markers are dragged, update the geometry of the line and polygon by resetting the
  //     LatLng at this position
  google.maps.event.addListener(marker, "drag", function(evt) {
    measure.mvcLine.setAt(latLngIndex, evt.latLng);
    measure.mvcPolygon.setAt(latLngIndex, evt.latLng);
  });

  // When dragging has ended and there is more than one vertex, measure length, area.
  google.maps.event.addListener(marker, "dragend", function() {
    if (measure.mvcLine.getLength() > 1) {
      measureCalc();
    }
  });

  // If there is more than one vertex on the line
  if (measure.mvcLine.getLength() > 1) {

    // If the line hasn't been created yet
    if (!measure.line) {

      // Create the line (google.maps.Polyline)
      measure.line = new google.maps.Polyline({
        map: map,
        clickable: false,
        strokeColor: "#FF0000",
        strokeOpacity: 1,
        strokeWeight: 3,
        path:measure. mvcLine
      });

    }

    // If there is more than two vertexes for a polygon
    if (measure.mvcPolygon.getLength() > 2) {

      // If the polygon hasn't been created yet
      if (!measure.polygon) {

        // Create the polygon (google.maps.Polygon)
        measure.polygon = new google.maps.Polygon({
          clickable: false,
          map: map,
          fillOpacity: 0.25,
          strokeOpacity: 0,
          paths: measure.mvcPolygon
        });

      }

    }

  }

  // If there's more than one vertex, measure length, area.
  if (measure.mvcLine.getLength() > 1) {
      measureCalc();
  }
}
于 2013-07-05T07:13:16.040 回答
2

这看起来是我发现的最接近多边形编辑器的实现：http: //snipplr.com/view/38270/google-maps-api-v3--enableediting-polylines/

于 2011-03-29T20:59:30.197 回答