mirror of
https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2026-01-01 22:30:14 +01:00
586 lines
21 KiB
C#
586 lines
21 KiB
C#
using System;
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#if WPF
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using System.Windows;
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using System.Windows.Media;
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#elif UWP
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Media;
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#elif WINUI
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Media;
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#elif AVALONIA
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using Avalonia;
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using Brush = Avalonia.Media.IBrush;
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#endif
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namespace MapControl
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{
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/// <summary>
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/// The map control. Displays map content provided by one or more tile or image layers,
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/// such as MapTileLayerBase or MapImageLayer instances.
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/// The visible map area is defined by the Center and ZoomLevel properties.
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/// The map can be rotated by an angle that is given by the Heading property.
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/// MapBase can contain map overlay child elements like other MapPanels or MapItemsControls.
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/// </summary>
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public partial class MapBase : MapPanel
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{
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public static double ZoomLevelToScale(double zoomLevel)
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{
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return 256d * Math.Pow(2d, zoomLevel) / (360d * MapProjection.Wgs84MeterPerDegree);
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}
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public static double ScaleToZoomLevel(double scale)
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{
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return Math.Log(scale * 360d * MapProjection.Wgs84MeterPerDegree / 256d, 2d);
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}
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public static TimeSpan ImageFadeDuration { get; set; } = TimeSpan.FromSeconds(0.1);
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public static readonly DependencyProperty AnimationDurationProperty =
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DependencyPropertyHelper.Register<MapBase, TimeSpan>(nameof(AnimationDuration), TimeSpan.FromSeconds(0.3));
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public static readonly DependencyProperty MapProjectionProperty =
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DependencyPropertyHelper.Register<MapBase, MapProjection>(nameof(MapProjection), new WebMercatorProjection(),
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(map, oldValue, newValue) => map.MapProjectionPropertyChanged(newValue));
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public static readonly DependencyProperty ProjectionCenterProperty =
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DependencyPropertyHelper.Register<MapBase, Location>(nameof(ProjectionCenter), null,
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(map, oldValue, newValue) => map.ProjectionCenterPropertyChanged());
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private Location transformCenter;
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private Point viewCenter;
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private Rect? mapBounds;
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private BoundingBox geoBounds;
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private double centerLongitude;
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private double maxLatitude = 85.05112878; // default WebMercatorProjection
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private bool internalPropertyChange;
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/// <summary>
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/// Raised when the current map viewport has changed.
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/// </summary>
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public event EventHandler<ViewportChangedEventArgs> ViewportChanged;
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/// <summary>
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/// Gets or sets the map foreground Brush.
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/// </summary>
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public Brush Foreground
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{
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get => (Brush)GetValue(ForegroundProperty);
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set => SetValue(ForegroundProperty, value);
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}
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/// <summary>
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/// Gets or sets the duration of the Center, ZoomLevel and Heading animations.
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/// The default value is 0.3 seconds.
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/// </summary>
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public TimeSpan AnimationDuration
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{
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get => (TimeSpan)GetValue(AnimationDurationProperty);
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set => SetValue(AnimationDurationProperty, value);
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}
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/// <summary>
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/// Gets or sets the MapProjection used by the map control.
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/// </summary>
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public MapProjection MapProjection
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{
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get => (MapProjection)GetValue(MapProjectionProperty);
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set => SetValue(MapProjectionProperty, value);
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}
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/// <summary>
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/// Gets or sets an optional center (reference point) for azimuthal projections.
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/// If ProjectionCenter is null, the Center property value will be used instead.
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/// </summary>
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public Location ProjectionCenter
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{
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get => (Location)GetValue(ProjectionCenterProperty);
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set => SetValue(ProjectionCenterProperty, value);
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}
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/// <summary>
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/// Gets or sets the location of the center point of the map.
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/// </summary>
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public Location Center
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{
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get => (Location)GetValue(CenterProperty);
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set => SetValue(CenterProperty, value);
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}
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/// <summary>
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/// Gets or sets the target value of a Center animation.
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/// </summary>
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public Location TargetCenter
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{
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get => (Location)GetValue(TargetCenterProperty);
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set => SetValue(TargetCenterProperty, value);
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}
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/// <summary>
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/// Gets or sets the minimum value of the ZoomLevel and TargetZoomLevel properties.
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/// Must not be less than zero or greater than MaxZoomLevel. The default value is 1.
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/// </summary>
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public double MinZoomLevel
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{
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get => (double)GetValue(MinZoomLevelProperty);
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set => SetValue(MinZoomLevelProperty, value);
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}
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/// <summary>
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/// Gets or sets the maximum value of the ZoomLevel and TargetZoomLevel properties.
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/// Must not be less than MinZoomLevel. The default value is 20.
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/// </summary>
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public double MaxZoomLevel
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{
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get => (double)GetValue(MaxZoomLevelProperty);
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set => SetValue(MaxZoomLevelProperty, value);
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}
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/// <summary>
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/// Gets or sets the map zoom level.
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/// </summary>
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public double ZoomLevel
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{
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get => (double)GetValue(ZoomLevelProperty);
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set => SetValue(ZoomLevelProperty, value);
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}
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/// <summary>
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/// Gets or sets the target value of a ZoomLevel animation.
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/// </summary>
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public double TargetZoomLevel
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{
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get => (double)GetValue(TargetZoomLevelProperty);
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set => SetValue(TargetZoomLevelProperty, value);
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}
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/// <summary>
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/// Gets or sets the map heading, a counter-clockwise rotation angle in degrees.
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/// </summary>
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public double Heading
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{
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get => (double)GetValue(HeadingProperty);
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set => SetValue(HeadingProperty, value);
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}
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/// <summary>
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/// Gets or sets the target value of a Heading animation.
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/// </summary>
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public double TargetHeading
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{
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get => (double)GetValue(TargetHeadingProperty);
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set => SetValue(TargetHeadingProperty, value);
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}
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/// <summary>
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/// Gets the map viewport bounds in projected map coordinates.
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/// </summary>
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public Rect MapBounds
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{
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get
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{
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if (!mapBounds.HasValue)
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{
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mapBounds = ViewRectToMap(0d, 0d, ActualWidth, ActualHeight);
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}
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return mapBounds.Value;
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}
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}
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/// <summary>
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/// Gets the map viewport bounds in geographic coordinates.
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/// </summary>
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public BoundingBox GeoBounds => geoBounds ??= MapProjection.MapToBoundingBox(MapBounds);
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/// <summary>
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/// Gets the ViewTransform instance that is used to transform between projected
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/// map coordinates and view coordinates.
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/// </summary>
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public ViewTransform ViewTransform { get; } = new ViewTransform();
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/// <summary>
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/// Gets the map scale as horizontal and vertical scaling factors from meters to
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/// view coordinates at the specified geographic coordinates.
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/// </summary>
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public Point GetMapScale(double latitude, double longitude)
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{
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var relativeScale = MapProjection.GetRelativeScale(latitude, longitude);
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return new Point(ViewTransform.Scale * relativeScale.X, ViewTransform.Scale * relativeScale.Y);
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}
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/// <summary>
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/// Gets the map scale as horizontal and vertical scaling factors from meters to
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/// view coordinates at the specified location.
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/// </summary>
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public Point GetMapScale(Location location)
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{
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var relativeScale = MapProjection.GetRelativeScale(location);
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return new Point(ViewTransform.Scale * relativeScale.X, ViewTransform.Scale * relativeScale.Y);
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}
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/// <summary>
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/// Gets a transform Matrix from meters to view coordinates for scaling and rotating
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/// objects that are anchored at the specified Location.
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/// </summary>
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public Matrix GetMapTransform(Location location)
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{
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return ViewTransform.GetMapTransform(MapProjection.GetRelativeScale(location));
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}
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/// <summary>
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/// Transforms geographic coordinates to a Point in view coordinates.
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/// </summary>
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public Point? LocationToView(double latitude, double longitude)
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{
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var point = MapProjection.LocationToMap(latitude, longitude);
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if (point.HasValue)
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{
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point = ViewTransform.MapToViewMatrix.Transform(point.Value);
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}
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return point;
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}
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/// <summary>
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/// Transforms a Location in geographic coordinates to a Point in view coordinates.
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/// </summary>
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public Point? LocationToView(Location location)
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{
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return LocationToView(location.Latitude, location.Longitude);
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}
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/// <summary>
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/// Transforms a Point in view coordinates to a Location in geographic coordinates.
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/// </summary>
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public Location ViewToLocation(Point point)
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{
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return MapProjection.MapToLocation(ViewTransform.ViewToMapMatrix.Transform(point));
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}
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/// <summary>
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/// Gets a Rect in projected map coordinates that covers a rectangle in view coordinates.
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/// </summary>
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public Rect ViewRectToMap(double x, double y, double width, double height)
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{
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var viewToMap = ParentMap.ViewTransform.ViewToMapMatrix;
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var p1 = viewToMap.Transform(new Point(x, y));
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var p2 = viewToMap.Transform(new Point(x, y + height));
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var p3 = viewToMap.Transform(new Point(x + width, y));
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var p4 = viewToMap.Transform(new Point(x + width, y + height));
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var x1 = Math.Min(p1.X, Math.Min(p2.X, Math.Min(p3.X, p4.X)));
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var y1 = Math.Min(p1.Y, Math.Min(p2.Y, Math.Min(p3.Y, p4.Y)));
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var x2 = Math.Max(p1.X, Math.Max(p2.X, Math.Max(p3.X, p4.X)));
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var y2 = Math.Max(p1.Y, Math.Max(p2.Y, Math.Max(p3.Y, p4.Y)));
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return new Rect(x1, y1, x2 - x1, y2 - y1);
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}
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/// <summary>
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/// Gets a BoundingBox in geographic coordinates that covers a rectangle in view coordinates.
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/// </summary>
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public BoundingBox ViewRectToBoundingBox(double x, double y, double width, double height)
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{
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return MapProjection.MapToBoundingBox(ViewRectToMap(x, y, width, height));
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}
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/// <summary>
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/// Sets a temporary center point in view coordinates for scaling and rotation transformations.
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/// This center point is automatically reset when the Center property is set by application code
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/// or by the methods TranslateMap, TransformMap, ZoomMap and ZoomToBounds.
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/// </summary>
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public void SetTransformCenter(Point center)
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{
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transformCenter = ViewToLocation(center);
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viewCenter = transformCenter != null ? center : new Point(ActualWidth / 2d, ActualHeight / 2d);
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}
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/// <summary>
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/// Resets the temporary transform center point set by SetTransformCenter.
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/// </summary>
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public void ResetTransformCenter()
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{
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transformCenter = null;
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viewCenter = new Point(ActualWidth / 2d, ActualHeight / 2d);
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}
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/// <summary>
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/// Changes the Center property according to the specified translation in view coordinates.
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/// </summary>
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public void TranslateMap(Point translation)
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{
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if (translation.X != 0d || translation.Y != 0d)
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{
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var center = ViewToLocation(new Point(viewCenter.X - translation.X, viewCenter.Y - translation.Y));
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if (center != null)
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{
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Center = center;
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}
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}
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}
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/// <summary>
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/// Changes the Center, Heading and ZoomLevel properties according to the specified
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/// view coordinate translation, rotation and scale delta values. Rotation and scaling
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/// is performed relative to the specified center point in view coordinates.
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/// </summary>
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public void TransformMap(Point center, Point translation, double rotation, double scale)
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{
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if (rotation == 0d && scale == 1d)
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{
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TranslateMap(translation);
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}
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else
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{
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SetTransformCenter(center);
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viewCenter = new Point(viewCenter.X + translation.X, viewCenter.Y + translation.Y);
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if (rotation != 0d)
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{
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var heading = CoerceHeadingProperty(Heading - rotation);
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SetValueInternal(HeadingProperty, heading);
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SetValueInternal(TargetHeadingProperty, heading);
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}
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if (scale != 1d)
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{
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var zoomLevel = CoerceZoomLevelProperty(ZoomLevel + Math.Log(scale, 2d));
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SetValueInternal(ZoomLevelProperty, zoomLevel);
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SetValueInternal(TargetZoomLevelProperty, zoomLevel);
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}
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UpdateTransform(true);
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}
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}
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/// <summary>
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/// Sets the ZoomLevel or TargetZoomLevel property while retaining
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/// the specified center point in view coordinates.
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/// </summary>
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public void ZoomMap(Point center, double zoomLevel, bool animated = true)
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{
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zoomLevel = CoerceZoomLevelProperty(zoomLevel);
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if (animated || zoomLevelAnimation != null)
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{
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if (TargetZoomLevel != zoomLevel)
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{
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SetTransformCenter(center);
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TargetZoomLevel = zoomLevel;
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}
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}
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else
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{
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if (ZoomLevel != zoomLevel)
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{
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SetTransformCenter(center);
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SetValueInternal(ZoomLevelProperty, zoomLevel);
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SetValueInternal(TargetZoomLevelProperty, zoomLevel);
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UpdateTransform(true);
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}
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}
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}
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/// <summary>
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/// Sets the TargetZoomLevel and TargetCenter properties so that the specified BoundingBox
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/// fits into the current view. The TargetHeading property is set to zero.
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/// </summary>
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public void ZoomToBounds(BoundingBox bounds)
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{
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var mapRect = MapProjection.BoundingBoxToMap(bounds);
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if (mapRect.HasValue)
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{
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var targetCenter = MapProjection.MapToLocation(
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mapRect.Value.X + mapRect.Value.Width / 2d,
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mapRect.Value.Y + mapRect.Value.Height / 2d);
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if (targetCenter != null)
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{
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var scale = Math.Min(ActualWidth / mapRect.Value.Width, ActualHeight / mapRect.Value.Height);
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TargetZoomLevel = ScaleToZoomLevel(scale);
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TargetCenter = targetCenter;
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TargetHeading = 0d;
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}
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}
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}
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internal bool InsideViewBounds(Point point)
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{
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return point.X >= 0d && point.Y >= 0d && point.X <= ActualWidth && point.Y <= ActualHeight;
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}
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internal double CoerceLongitude(double longitude)
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{
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var offset = longitude - Center.Longitude;
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if (offset > 180d)
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{
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longitude = Center.Longitude + (offset % 360d) - 360d;
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}
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else if (offset < -180d)
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{
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longitude = Center.Longitude + (offset % 360d) + 360d;
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}
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return longitude;
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}
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private Location CoerceCenterProperty(Location center)
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{
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if (center == null)
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{
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center = new Location();
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}
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else if (
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center.Latitude < -maxLatitude || center.Latitude > maxLatitude ||
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center.Longitude < -180d || center.Longitude > 180d)
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{
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center = new Location(
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Math.Min(Math.Max(center.Latitude, -maxLatitude), maxLatitude),
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Location.NormalizeLongitude(center.Longitude));
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}
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return center;
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}
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private double CoerceMinZoomLevelProperty(double minZoomLevel)
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{
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return Math.Min(Math.Max(minZoomLevel, 0d), MaxZoomLevel);
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}
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private double CoerceMaxZoomLevelProperty(double maxZoomLevel)
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{
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return Math.Max(maxZoomLevel, MinZoomLevel);
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}
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private double CoerceZoomLevelProperty(double zoomLevel)
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{
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return Math.Min(Math.Max(zoomLevel, MinZoomLevel), MaxZoomLevel);
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}
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private double CoerceHeadingProperty(double heading)
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{
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return ((heading % 360d) + 360d) % 360d;
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}
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private void SetValueInternal(DependencyProperty property, object value)
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{
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internalPropertyChange = true;
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SetValue(property, value);
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internalPropertyChange = false;
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}
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private void MapProjectionPropertyChanged(MapProjection projection)
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{
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maxLatitude = 90d;
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if (projection.Type <= MapProjectionType.NormalCylindrical)
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{
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var maxLocation = projection.MapToLocation(0d, 180d * MapProjection.Wgs84MeterPerDegree);
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if (maxLocation != null && maxLocation.Latitude < 90d)
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{
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maxLatitude = maxLocation.Latitude;
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Center = CoerceCenterProperty(Center);
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}
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}
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ResetTransformCenter();
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UpdateTransform(false, true);
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}
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private void ProjectionCenterPropertyChanged()
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{
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ResetTransformCenter();
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UpdateTransform();
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}
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private void UpdateTransform(bool resetTransformCenter = false, bool projectionChanged = false)
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{
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var transformCenterChanged = false;
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var viewScale = ZoomLevelToScale(ZoomLevel);
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var projection = MapProjection;
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projection.Center = ProjectionCenter ?? Center;
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var mapCenter = projection.LocationToMap(transformCenter ?? Center);
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if (mapCenter.HasValue)
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{
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ViewTransform.SetTransform(mapCenter.Value, viewCenter, viewScale, -Heading);
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if (transformCenter != null)
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{
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var center = ViewToLocation(new Point(ActualWidth / 2d, ActualHeight / 2d));
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if (center != null)
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{
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var centerLat = center.Latitude;
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var centerLon = Location.NormalizeLongitude(center.Longitude);
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if (centerLat < -maxLatitude || centerLat > maxLatitude)
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{
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centerLat = Math.Min(Math.Max(centerLat, -maxLatitude), maxLatitude);
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resetTransformCenter = true;
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}
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center = new Location(centerLat, centerLon);
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SetValueInternal(CenterProperty, center);
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if (centerAnimation == null)
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{
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SetValueInternal(TargetCenterProperty, center);
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}
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if (resetTransformCenter)
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{
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// Check if transform center has moved across 180° longitude.
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//
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transformCenterChanged = Math.Abs(center.Longitude - transformCenter.Longitude) > 180d;
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ResetTransformCenter();
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projection.Center = ProjectionCenter ?? Center;
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mapCenter = projection.LocationToMap(center);
|
|
|
|
if (mapCenter.HasValue)
|
|
{
|
|
ViewTransform.SetTransform(mapCenter.Value, viewCenter, viewScale, -Heading);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ViewScale = ViewTransform.Scale;
|
|
|
|
// Check if view center has moved across 180° longitude.
|
|
//
|
|
transformCenterChanged = transformCenterChanged || Math.Abs(Center.Longitude - centerLongitude) > 180d;
|
|
centerLongitude = Center.Longitude;
|
|
|
|
OnViewportChanged(new ViewportChangedEventArgs(projectionChanged, transformCenterChanged));
|
|
}
|
|
}
|
|
|
|
protected override void OnViewportChanged(ViewportChangedEventArgs e)
|
|
{
|
|
base.OnViewportChanged(e);
|
|
|
|
mapBounds = null;
|
|
geoBounds = null;
|
|
|
|
ViewportChanged?.Invoke(this, e);
|
|
}
|
|
}
|
|
}
|