ClemensFischer/XAML-Map-Control
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LatLonBoxToMap with rotated skew matrix

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ClemensFischer 2026-01-26 22:17:46 +01:00
parent ffd1c1c6cd
commit dbc4c142f7
2 changed files with 22 additions and 14 deletions
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15
MapControl/Shared/MapProjection.cs
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@ -165,10 +165,10 @@ namespace MapControl
/// Transforms a LatLonBox in geographic coordinates to a rotated Rect in projected map coordinates.
/// Returns (null, 0d) when the LatLonBox can not be transformed.
/// </summary>
public (Rect?, double) LatLonBoxToMap(LatLonBox latLonBox)
public (Rect?, Matrix) LatLonBoxToMap(LatLonBox latLonBox)
{
Rect? rect = null;
var rotation = 0d;
Matrix transform;
var sw = LocationToMap(latLonBox.South, latLonBox.West);
var se = LocationToMap(latLonBox.South, latLonBox.East);
var nw = LocationToMap(latLonBox.North, latLonBox.West);
@ -192,12 +192,17 @@ namespace MapControl
rect = new Rect(x, y, width, height);
// Additional rotation from the slope of the line segment west-east.
// Skew matrix with skewX = Atan(-dx2 / dy2) and skewY = Atan(-dy1 / dx1).
//
rotation = (latLonBox.Rotation + Math.Atan2(dy1, dx1) * 180d / Math.PI) % 360d;
transform = new Matrix(1d, -dy1 / dx1, -dx2 / dy2, 1d, 0d, 0d);
transform.Rotate(-latLonBox.Rotation);
}
else
{
transform = new Matrix(1d, 0d, 0d, 1d, 0d, 0d);
}
return (rect, rotation);
return (rect, transform);
}
public override string ToString()