Question

我正在使用bing地图。至于现在，它绘制了两个地点之间的界线，但它使用了道路。我希望它是飞机视图，这样它就可以画出点之间的直线并告诉我它们之间的距离。我现在正在使用它：

var startwaypoint = new Microsoft.Maps.Directions.Waypoint({ location: new Microsoft.Maps.Location(lat1, lon1) });
bingDirections.addWaypoint(startwaypoint);
// end
var endwaypoint = new Microsoft.Maps.Directions.Waypoint({ location: new Microsoft.Maps.Location(lat2, lon2) });
bingDirections.addWaypoint(endwaypoint);

我将坐标放在lat1和lon1中。

Answer 1

我们的阿拉斯泰尔同事写了一篇文章，在Bing Maps V7上绘制测地线（大圆）。我很确定你可以从他的文章中获得重要的东西并调整JavaScript代码，使其适用于你的C＃控件。

请参阅文章：http://alastaira.wordpress.com/2011/06/27/geodesics-on-bing-maps-v7/

以下是您应该能够在C＃中适应的JavaScript代码：

    // Creates geodesic approximation of the lines drawn between an array
// of points, by dividing each line into a number of segments.
function ToGeodesic(points, n) {
  if (!n) { n = 32 }; // The number of line segments to use
  var locs = new Array();
  for (var i = 0; i < points.length - 1; i++) {
    with (Math) {
      // Convert coordinates from degrees to Radians
      var lat1 = points[i].latitude * (PI / 180);
      var lon1 = points[i].longitude * (PI / 180);
      var lat2 = points[i + 1].latitude * (PI / 180);
      var lon2 = points[i + 1].longitude * (PI / 180);
      // Calculate the total extent of the route
      var d = 2 * asin(sqrt(pow((sin((lat1 - lat2) / 2)), 2) + cos(lat1) * cos(lat2) * pow((sin((lon1 - lon2) / 2)), 2)));
      // Calculate  positions at fixed intervals along the route
      for (var k = 0; k <= n; k++) {
        var f = (k / n);
        var A = sin((1 - f) * d) / sin(d);
        var B = sin(f * d) / sin(d);
        // Obtain 3D Cartesian coordinates of each point
        var x = A * cos(lat1) * cos(lon1) + B * cos(lat2) * cos(lon2);
        var y = A * cos(lat1) * sin(lon1) + B * cos(lat2) * sin(lon2);
        var z = A * sin(lat1) + B * sin(lat2);
        // Convert these to latitude/longitude
        var lat = atan2(z, sqrt(pow(x, 2) + pow(y, 2)));
        var lon = atan2(y, x);
        // Create a Location (remember to convert back to degrees)
        var p = new Microsoft.Maps.Location(lat / (PI / 180), lon / (PI / 180));
        // Add this to the array
        locs.push(p);
      }
    }
  }
  return locs;

}

bing映射两个位置之间的直线

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