[英]How to get the bounds of a map control?
尋求幫助在 Windows Phone c# 上獲取地圖控件的邊界,如地圖頂部的緯度,地圖底部的經度(可見區域),與經度相同,但顯然是左/右。
我為菜鳥“給我答案”之類的問題道歉,但我完全不知道該怎么做。
代碼:
public LocationRectangle GetVisibleMapArea(Map mMap)
{
GeoCoordinate mCenter = mMap.Center;
Point pCenter = mMap.ConvertGeoCoordinateToViewportPoint(mCenter);
GeoCoordinate topLeft = MapVieMode.ConvertViewportPointToGeoCoordinate(new Point(0, 0));
GeoCoordinate bottomRight = MapVieMode.ConvertViewportPointToGeoCoordinate(new Point(MapVieMode.ActualWidth, MapVieMode.ActualHeight));
if (topLeft != null && bottomRight != null)
{
Point pNW = new Point(pCenter.X - mMap.ActualWidth / 2, pCenter.Y - mMap.ActualHeight / 2);
Point pSE = new Point(pCenter.X + mMap.ActualWidth / 2, pCenter.Y + mMap.ActualHeight / 2);
if (pNW != null && pSE != null)
{
GeoCoordinate gcNW = mMap.ConvertViewportPointToGeoCoordinate(pNW);
GeoCoordinate gcSE = mMap.ConvertViewportPointToGeoCoordinate(pSE);
return new LocationRectangle(gcNW, gcSE);
}
}
return null;
}
取自此處的示例: http : //code.msdn.microsoft.com/wpapps/Windows-Phone-8-Map-0ca7bd6c
我創建了一段代碼,用於在 UWP 中查找 mapControl 的視點。
享受
public GeoboundingBox GetBounds(MapControl map)
{
if(map.Center.Position.Latitude == 0) { return default(GeoboundingBox); }
double degreePerPixel = (156543.04 * Math.Cos(map.Center.Position.Latitude * Math.PI / 180)) / (111325 * Math.Pow(2, map.ZoomLevel));
double mHalfWidthInDegrees = map.ActualWidth * degreePerPixel / 0.9;
double mHalfHeightInDegrees = map.ActualHeight * degreePerPixel / 1.7;
double mNorth = map.Center.Position.Latitude + mHalfHeightInDegrees;
double mWest = map.Center.Position.Longitude - mHalfWidthInDegrees;
double mSouth = map.Center.Position.Latitude - mHalfHeightInDegrees;
double mEast = map.Center.Position.Longitude + mHalfWidthInDegrees;
GeoboundingBox mBounds = new GeoboundingBox(
new BasicGeoposition()
{
Latitude = mNorth,
Longitude = mWest
},
new BasicGeoposition()
{
Latitude = mSouth,
Longitude = mEast
});
Debug.WriteLine("New Bounds: NW = " + mNorth + ":" + mWest + " SE = " + mSouth + ":" + mEast);
return mBounds;
}
如果用戶旋轉地圖,此函數缺少的是計算航向。 有人對此有解決方案嗎?
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