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GeoImage implementation

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ClemensFischer 2024-09-01 14:33:34 +02:00
parent aa6018cf0e
commit 1f5e82518a
3 changed files with 39 additions and 52 deletions
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87
MapControl/Shared/GeoImage.cs
View file

@ -29,11 +29,34 @@ namespace MapControl
{
public partial class GeoImage : Grid
{
private class DefaultProjection : MapProjection
{
public override Point? LocationToMap(Location location) => new Point(location.Longitude, location.Latitude);
public override Location MapToLocation(Point point) => new Location(point.Y, point.X);
}
private class GeoBitmap
{
public BitmapSource Bitmap { get; set; }
public Matrix Transform { get; set; }
public MapProjection Projection { get; set; }
public MapProjection Projection { get; set; } = new DefaultProjection();
public void SetProjection(short[] geoKeyDirectory)
{
for (var i = 4; i < geoKeyDirectory.Length - 3; i += 4)
{
if (geoKeyDirectory[i] == ProjectedCRSGeoKey && geoKeyDirectory[i + 1] == 0)
{
var epsgCode = geoKeyDirectory[i + 3];
var projection = MapProjectionFactory.Instance.GetProjection(epsgCode) ??
throw new ArgumentException($"Can not create projection EPSG:{epsgCode}.");
Projection = projection;
break;
}
}
}
}
private const ushort ProjectedCRSGeoKey = 3072;
@ -87,15 +110,20 @@ namespace MapControl
}
}
#if AVALONIA
if (geoBitmap == null) return;
var width = geoBitmap.Bitmap.PixelSize.Width;
var height = geoBitmap.Bitmap.PixelSize.Height;
#else
if (geoBitmap == null)
{
#if AVALONIA
return;
#else
geoBitmap = await ReadGeoTiffAsync(sourcePath);
#endif
}
var width = geoBitmap.Bitmap.PixelWidth;
var height = geoBitmap.Bitmap.PixelHeight;
#endif
var image = new Image
{
Source = geoBitmap.Bitmap,
@ -105,32 +133,11 @@ namespace MapControl
};
var transform = geoBitmap.Transform;
var p1 = transform.Transform(new Point());
var p2 = transform.Transform(new Point(width, height));
var mapRect = new Rect(p1, p2); ;
if (transform.M12 != 0 && transform.M21 != 0)
{
var rotation = (Math.Atan2(transform.M12, transform.M11) + Math.Atan2(transform.M21, -transform.M22)) * 90d / Math.PI;
image.RenderTransform = new RotateTransform { Angle = -rotation };
// Calculate effective unrotated transform.
//
geoBitmap.Transform = new Matrix(
Math.Sqrt(transform.M11 * transform.M11 + transform.M12 * transform.M12), 0d, 0d,
-Math.Sqrt(transform.M22 * transform.M22 + transform.M21 * transform.M21), 0d, 0d);
}
#if AVALONIA
var size = new Point(geoBitmap.Bitmap.PixelSize.Width, geoBitmap.Bitmap.PixelSize.Height);
#else
var size = new Point(geoBitmap.Bitmap.PixelWidth, geoBitmap.Bitmap.PixelHeight);
#endif
var rect = new Rect(transform.Transform(new Point()), transform.Transform(size));
var boundingBox = geoBitmap.Projection != null
? geoBitmap.Projection.MapToBoundingBox(rect)
: new BoundingBox(rect.Y, rect.X, rect.Y + rect.Height, rect.X + rect.Width);
MapPanel.SetBoundingBox(this, boundingBox);
MapPanel.SetBoundingBox(this, geoBitmap.Projection.MapToBoundingBox(mapRect));
Children.Clear();
Children.Add(image);
@ -167,25 +174,5 @@ namespace MapControl
parameters[4], // line 5: C or OffsetX
parameters[5]); // line 6: F or OffsetY
}
private static MapProjection GetProjection(short[] geoKeyDirectory)
{
MapProjection projection = null;
for (int i = 4; i < geoKeyDirectory.Length - 3; i += 4)
{
if (geoKeyDirectory[i] == ProjectedCRSGeoKey && geoKeyDirectory[i + 1] == 0)
{
int epsgCode = geoKeyDirectory[i + 3];
projection = MapProjectionFactory.Instance.GetProjection(epsgCode) ??
throw new ArgumentException($"Can not create projection EPSG:{epsgCode}.");
break;
}
}
return projection;
}
}
}

2
MapControl/WPF/GeoImage.WPF.cs
View file

@ -47,7 +47,7 @@ namespace MapControl
if (metadata.GetQuery(QueryString(GeoKeyDirectoryTag)) is short[] geoKeyDirectory)
{
geoBitmap.Projection = GetProjection(geoKeyDirectory);
geoBitmap.SetProjection(geoKeyDirectory);
}
if (metadata.GetQuery(QueryString(NoDataTag)) is string noData &&

2
MapControl/WinUI/GeoImage.WinUI.cs
View file

@ -60,7 +60,7 @@ namespace MapControl
if (metadata.TryGetValue(geoKeyDirectoryQuery, out BitmapTypedValue geoKeyDirValue) &&
geoKeyDirValue.Value is short[] geoKeyDirectory)
{
geoBitmap.Projection = GetProjection(geoKeyDirectory);
geoBitmap.SetProjection(geoKeyDirectory);
}
return geoBitmap;