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Updated ViewTransform and WmsImageLayer

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ClemensFischer 2026-01-01 12:50:19 +01:00
parent 4628395c37
commit f8f6fdc973
5 changed files with 60 additions and 129 deletions
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81
MapControl/Avalonia/ViewTransform.Avalonia.cs
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using Avalonia;
namespace MapControl
{
public partial class ViewTransform
{
/// <summary>
/// Initializes a ViewTransform from a map center point in projected coordinates,
/// a view conter point, a scaling factor from projected coordinates to view coordinates
/// and a rotation angle in degrees.
/// </summary>
public void SetTransform(Point mapCenter, Point viewCenter, double scale, double rotation)
{
Scale = scale;
Rotation = ((rotation % 360d) + 360d) % 360d;
MapToViewMatrix = Matrix.CreateTranslation(-mapCenter.X, -mapCenter.Y)
* Matrix.CreateScale(scale, -scale)
* Matrix.CreateRotation(Matrix.ToRadians(Rotation))
* Matrix.CreateTranslation(viewCenter.X, viewCenter.Y);
ViewToMapMatrix = MapToViewMatrix.Invert();
}
/// <summary>
/// Gets a transform Matrix from meters to view coordinates for a relative map scale.
/// </summary>
public Matrix GetMapTransform(Point relativeScale)
{
return Matrix.CreateScale(Scale * relativeScale.X, Scale * relativeScale.Y)
* Matrix.CreateRotation(Matrix.ToRadians(Rotation));
}
/// <summary>
/// Gets the transform Matrix for the RenderTranform of a MapTileLayer.
/// </summary>
public Matrix GetTileLayerTransform(double tileMatrixScale, Point tileMatrixTopLeft, Point tileMatrixOrigin)
{
// Tile matrix origin in map coordinates.
//
var mapOrigin = new Point(
tileMatrixTopLeft.X + tileMatrixOrigin.X / tileMatrixScale,
tileMatrixTopLeft.Y - tileMatrixOrigin.Y / tileMatrixScale);
// Tile matrix origin in view coordinates.
//
var viewOrigin = MapToViewMatrix.Transform(mapOrigin);
var transformScale = Scale / tileMatrixScale;
return Matrix.CreateScale(transformScale, transformScale)
* Matrix.CreateRotation(Matrix.ToRadians(Rotation))
* Matrix.CreateTranslation(viewOrigin.X, viewOrigin.Y);
}
/// <summary>
/// Gets the index bounds of a tile matrix.
/// </summary>
public Rect GetTileMatrixBounds(double tileMatrixScale, Point tileMatrixTopLeft, double viewWidth, double viewHeight)
{
// View origin in map coordinates.
//
var origin = ViewToMapMatrix.Transform(new Point());
var transformScale = tileMatrixScale / Scale;
var transform = Matrix.CreateScale(transformScale, transformScale)
* Matrix.CreateRotation(Matrix.ToRadians(-Rotation));
// Translate origin to tile matrix origin in pixels.
//
transform *= Matrix.CreateTranslation(
tileMatrixScale * (origin.X - tileMatrixTopLeft.X),
tileMatrixScale * (tileMatrixTopLeft.Y - origin.Y));
// Transform view bounds to tile pixel bounds.
//
return new Rect(0d, 0d, viewWidth, viewHeight).TransformToAABB(transform);
}
}
}