ClemensFischer/XAML-Map-Control
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LatLonBox transformation

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ClemensFischer 2024-09-09 16:44:45 +02:00
parent f143bdb5e6
commit 8efcee2585
10 changed files with 145 additions and 145 deletions
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50
MapControl/Shared/MapProjection.cs
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@ -66,27 +66,28 @@ namespace MapControl
/// </summary>
public virtual Rect? BoundingBoxToMap(BoundingBox boundingBox)
{
Rect? mapRect = null;
Rect? rect = null;
var southWest = LocationToMap(new Location(boundingBox.South, boundingBox.West));
var northEast = LocationToMap(new Location(boundingBox.North, boundingBox.East));
if (southWest.HasValue && northEast.HasValue)
{
mapRect = new Rect(southWest.Value, northEast.Value);
rect = new Rect(southWest.Value, northEast.Value);
}
return mapRect;
return rect;
}
/// <summary>
/// Transforms a Rect in projected map coordinates to a BoundingBox in geographic coordinates.
/// Returns null when the MapRect can not be transformed.
/// </summary>
public virtual BoundingBox MapToBoundingBox(Rect mapRect)
public virtual BoundingBox MapToBoundingBox(Rect rect)
{
BoundingBox boundingBox = null;
var southWest = MapToLocation(new Point(mapRect.X, mapRect.Y));
var northEast = MapToLocation(new Point(mapRect.X + mapRect.Width, mapRect.Y + mapRect.Height));
var southWest = MapToLocation(new Point(rect.X, rect.Y));
var northEast = MapToLocation(new Point(rect.X + rect.Width, rect.Y + rect.Height));
if (southWest != null && northEast != null)
{
@ -95,5 +96,42 @@ namespace MapControl
return boundingBox;
}
/// <summary>
/// Transforms a LatLonBox in geographic coordinates to a rotated Rect in projected map coordinates.
/// Returns null when the LatLonBox can not be transformed.
/// </summary>
public virtual Tuple<Rect, double> LatLonBoxToMap(LatLonBox latLonBox)
{
Tuple<Rect, double> rotatedRect = null;
Point? center, north, south, west, east;
var boxCenter = latLonBox.Center;
if ((center = LocationToMap(boxCenter)).HasValue &&
(north = LocationToMap(new Location(latLonBox.North, boxCenter.Longitude))).HasValue &&
(south = LocationToMap(new Location(latLonBox.South, boxCenter.Longitude))).HasValue &&
(west = LocationToMap(new Location(boxCenter.Latitude, latLonBox.West))).HasValue &&
(east = LocationToMap(new Location(boxCenter.Latitude, latLonBox.East))).HasValue)
{
var dx1 = east.Value.X - west.Value.X;
var dy1 = east.Value.Y - west.Value.Y;
var dx2 = north.Value.X - south.Value.X;
var dy2 = north.Value.Y - south.Value.Y;
var width = Math.Sqrt(dx1 * dx1 + dy1 * dy1);
var height = Math.Sqrt(dx2 * dx2 + dy2 * dy2);
var x = center.Value.X - width / 2d;
var y = center.Value.Y - height / 2d;
// angles measured relative to horizontal and vertical axis
var r1 = (Math.Atan2(dy1, dx1) * 180d / Math.PI + 180d) % 360d - 180d;
var r2 = (Math.Atan2(-dx2, dy2) * 180d / Math.PI + 180d) % 360d - 180d;
System.Diagnostics.Debug.WriteLine($"{r1}, {r2}");
rotatedRect = new Tuple<Rect, double>(new Rect(x, y, width, height), latLonBox.Rotation + (r1 + r2) / 2d);
}
return rotatedRect;
}
}
}