获取MapControl边框的距离(以度为单位) [英] Get distance of MapControl border in degrees
问题描述
我有一个MapControl,想知道当前在x和y轴上显示多少度.
I have a MapControl and would like to know how many degrees are currently shown on the x and y axes.
第一个示例:
x轴(经度)上显示360度
360 degrees are shown on the x axis (longitude)
〜90度显示在y轴(纬度)上
~90 degrees are shown on the y axis (latitude)
(缩放级别为3.2,最大可缩放)
(The zoom level is 3.2 and it's max zoomed out)
第二个例子:
〜x轴上的220度(经度)
~220 degrees on the x axis (longitude)
y轴(纬度)180度
180 degrees on the y axis (latitude)
(缩放级别:1.7;最大缩小)
(zoom level: 1.7; max zoomed out)
我尝试使用以下代码计算x轴上的当前度:
I tried calculating the current degrees on the x axis using following code:
double dist = 360 * Math.Pow(0.5, macSurrounding.ZoomLevel - 1);
但是它不起作用,因为缩放级别很奇怪...
but it doesn't work, because the zoom level is just strange...
推荐答案
You should use the MapControl's GetLocationFromOffset method to calculate the geographic coordinates of the south-east and north-west corner points of the current map viewport. The width and height of the viewport would be the latitude and longitude differences of these points.
Geopoint northEast;
Geopoint southWest;
map.GetLocationFromOffset(new Point(map.ActualWidth, 0), out northEast);
map.GetLocationFromOffset(new Point(0, map.ActualHeight), out southWest);
var width = northEast.Position.Longitude - southWest.Position.Longitude;
var height = northEast.Position.Latitude - southWest.Position.Latitude;
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