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
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94
MapControl/WPF/MapItemsImageLayer.WPF.cs
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// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
// Copyright © 2024 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
namespace MapControl
{
public interface IMapDrawingItem
{
IEnumerable<Location> Locations { get; }
Drawing GetDrawing(IList<Point> points, double scale, double rotation);
}
public class MapItemsImageLayer : MapImageLayer
{
public static readonly DependencyProperty ItemsSourceProperty =
DependencyPropertyHelper.Register<MapItemsImageLayer, IEnumerable<IMapDrawingItem>>(nameof(ItemsSource));
public IEnumerable<IMapDrawingItem> ItemsSource
{
get => (IEnumerable<IMapDrawingItem>)GetValue(ItemsSourceProperty);
set => SetValue(ItemsSourceProperty, value);
}
protected override async Task<ImageSource> GetImageAsync(BoundingBox boundingBox, IProgress<double> progress)
{
ImageSource image = null;
var projection = ParentMap?.MapProjection;
var items = ItemsSource;
if (projection != null && items != null)
{
var mapRect = projection.BoundingBoxToMap(boundingBox);
if (mapRect.HasValue)
{
image = await Task.Run(() => GetImage(projection, mapRect.Value, items));
}
}
return image;
}
private DrawingImage GetImage(MapProjection projection, Rect mapRect, IEnumerable<IMapDrawingItem> items)
{
var scale = ParentMap.ViewTransform.Scale;
var rotation = ParentMap.ViewTransform.Rotation;
var drawings = new DrawingGroup();
foreach (var item in items)
{
var points = item.Locations
.Select(location => projection.LocationToMap(location))
.Where(point => point.HasValue)
.Select(point => point.Value)
.ToList();
if (points.Any(point => mapRect.Contains(point)))
{
for (int i = 0; i < points.Count; i++)
{
points[i] = new Point(
scale * (points[i].X - mapRect.X),
scale * ((mapRect.Y + mapRect.Height) - points[i].Y));
}
drawings.Children.Add(item.GetDrawing(points, scale, rotation));
}
}
var drawingBrush = new DrawingBrush
{
Drawing = drawings,
ViewboxUnits = BrushMappingMode.Absolute,
Viewbox = new Rect(0, 0, scale * mapRect.Width, scale * mapRect.Height),
};
var drawing = new GeometryDrawing(
drawingBrush, null, new RectangleGeometry(drawingBrush.Viewbox));
var image = new DrawingImage(drawing);
image.Freeze();
return image;
}
}
}