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https://github.com/ClemensFischer/XAML-Map-Control.git
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806 lines
28 KiB
C#
806 lines
28 KiB
C#
// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
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// © 2022 Clemens Fischer
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// Licensed under the Microsoft Public License (Ms-PL)
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using System;
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#if WINUI
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using Windows.Foundation;
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Media;
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using Microsoft.UI.Xaml.Media.Animation;
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#elif UWP
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using Windows.Foundation;
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Media;
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using Windows.UI.Xaml.Media.Animation;
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#else
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using System.Windows;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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#endif
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namespace MapControl
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{
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public interface IMapLayer : IMapElement
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{
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Brush MapBackground { get; }
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Brush MapForeground { get; }
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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 TimeSpan ImageFadeDuration { get; set; } = TimeSpan.FromSeconds(0.1);
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public static readonly DependencyProperty MapLayerProperty = DependencyProperty.Register(
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nameof(MapLayer), typeof(UIElement), typeof(MapBase),
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new PropertyMetadata(null, (o, e) => ((MapBase)o).MapLayerPropertyChanged((UIElement)e.OldValue, (UIElement)e.NewValue)));
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public static readonly DependencyProperty MapProjectionProperty = DependencyProperty.Register(
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nameof(MapProjection), typeof(MapProjection), typeof(MapBase),
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new PropertyMetadata(new WebMercatorProjection(), (o, e) => ((MapBase)o).MapProjectionPropertyChanged((MapProjection)e.NewValue)));
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public static readonly DependencyProperty ProjectionCenterProperty = DependencyProperty.Register(
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nameof(ProjectionCenter), typeof(Location), typeof(MapBase),
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new PropertyMetadata(null, (o, e) => ((MapBase)o).ProjectionCenterPropertyChanged()));
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public static readonly DependencyProperty MinZoomLevelProperty = DependencyProperty.Register(
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nameof(MinZoomLevel), typeof(double), typeof(MapBase),
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new PropertyMetadata(1d, (o, e) => ((MapBase)o).MinZoomLevelPropertyChanged((double)e.NewValue)));
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public static readonly DependencyProperty MaxZoomLevelProperty = DependencyProperty.Register(
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nameof(MaxZoomLevel), typeof(double), typeof(MapBase),
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new PropertyMetadata(20d, (o, e) => ((MapBase)o).MaxZoomLevelPropertyChanged((double)e.NewValue)));
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public static readonly DependencyProperty AnimationDurationProperty = DependencyProperty.Register(
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nameof(AnimationDuration), typeof(TimeSpan), typeof(MapBase),
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new PropertyMetadata(TimeSpan.FromSeconds(0.3)));
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public static readonly DependencyProperty AnimationEasingFunctionProperty = DependencyProperty.Register(
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nameof(AnimationEasingFunction), typeof(EasingFunctionBase), typeof(MapBase),
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new PropertyMetadata(new QuadraticEase { EasingMode = EasingMode.EaseOut }));
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private PointAnimation centerAnimation;
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private DoubleAnimation zoomLevelAnimation;
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private DoubleAnimation headingAnimation;
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private Location transformCenter;
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private Point viewCenter;
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private double centerLongitude;
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private double maxLatitude = 90d;
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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 base map layer, which is added as first element to the Children collection.
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/// If the layer implements IMapLayer (like MapTileLayer or MapImageLayer), its (non-null) MapBackground
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/// and MapForeground property values are used for the MapBase Background and Foreground properties.
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/// </summary>
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public UIElement MapLayer
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{
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get => (UIElement)GetValue(MapLayerProperty);
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set => SetValue(MapLayerProperty, 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 TargetZommLevel properties.
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/// Must be greater than or equal to zero and less than or equal to MaxZoomLevel.
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/// 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 TargetZommLevel properties.
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/// Must be greater than or equal to MinZoomLevel and less than or equal to 22.
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/// 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 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 EasingFunction of the Center, ZoomLevel and Heading animations.
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/// The default value is a QuadraticEase with EasingMode.EaseOut.
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/// </summary>
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public EasingFunctionBase AnimationEasingFunction
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{
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get => (EasingFunctionBase)GetValue(AnimationEasingFunctionProperty);
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set => SetValue(AnimationEasingFunctionProperty, value);
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}
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/// <summary>
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/// Gets the scaling factor from projected map coordinates to view coordinates,
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/// as pixels per meter.
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/// </summary>
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public double ViewScale => (double)GetValue(ViewScaleProperty);
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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 the horizontal and vertical scaling factors from geographic
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/// coordinates to view coordinates at the specified location, as pixels per meter.
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/// </summary>
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public Vector GetScale(Location location)
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{
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return ViewTransform.Scale * MapProjection.GetRelativeScale(location);
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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 ViewTransform.MapToView(MapProjection.LocationToMap(location));
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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.ViewToMap(point));
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}
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/// <summary>
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/// Transforms a Rect in view coordinates to a BoundingBox in geographic coordinates.
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/// </summary>
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public BoundingBox ViewRectToBoundingBox(Rect rect)
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{
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var p1 = ViewTransform.ViewToMap(new Point(rect.X, rect.Y));
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var p2 = ViewTransform.ViewToMap(new Point(rect.X, rect.Y + rect.Height));
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var p3 = ViewTransform.ViewToMap(new Point(rect.X + rect.Width, rect.Y));
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var p4 = ViewTransform.ViewToMap(new Point(rect.X + rect.Width, rect.Y + rect.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 x2 = Math.Max(p1.X, Math.Max(p2.X, Math.Max(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 y2 = Math.Max(p1.Y, Math.Max(p2.Y, Math.Max(p3.Y, p4.Y)));
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return MapProjection.RectToBoundingBox(new Rect(x1, y1, x2 - x1, y2 - y1));
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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(RenderSize.Width / 2d, RenderSize.Height / 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(RenderSize.Width / 2d, RenderSize.Height / 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(Vector translation)
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{
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if (transformCenter != null)
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{
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ResetTransformCenter();
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UpdateTransform();
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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(viewCenter - translation);
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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, Vector 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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SetTransformCenter(center);
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viewCenter += translation;
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if (rotation != 0d)
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{
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var heading = (((Heading - rotation) % 360d) + 360d) % 360d;
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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 = Math.Min(Math.Max(ZoomLevel + Math.Log(scale, 2d), MinZoomLevel), MaxZoomLevel);
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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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else
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{
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// More accurate than SetTransformCenter.
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//
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TranslateMap(translation);
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}
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}
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/// <summary>
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/// Sets the value of the TargetZoomLevel property while retaining the specified center point
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/// in view coordinates.
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/// </summary>
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public void ZoomMap(Point center, double zoomLevel)
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{
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zoomLevel = Math.Min(Math.Max(zoomLevel, MinZoomLevel), MaxZoomLevel);
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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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/// <summary>
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/// Sets the TargetZoomLevel and TargetCenter properties so that the specified bounding box
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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 boundingBox)
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{
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var rect = MapProjection.BoundingBoxToRect(boundingBox);
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var center = new Point(rect.X + rect.Width / 2d, rect.Y + rect.Height / 2d);
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var targetCenter = MapProjection.MapToLocation(center);
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if (targetCenter != null)
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{
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var scale = Math.Min(RenderSize.Width / rect.Width, RenderSize.Height / rect.Height);
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TargetZoomLevel = ViewTransform.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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internal double ConstrainedLongitude(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 - 360d + offset % 360d;
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}
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else if (offset < -180d)
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{
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longitude = Center.Longitude + 360d + offset % 360d;
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}
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return longitude;
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}
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private void MapLayerPropertyChanged(UIElement oldLayer, UIElement newLayer)
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{
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if (oldLayer != null)
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{
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Children.Remove(oldLayer);
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if (oldLayer is IMapLayer mapLayer)
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{
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if (mapLayer.MapBackground != null)
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{
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ClearValue(BackgroundProperty);
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}
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if (mapLayer.MapForeground != null)
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{
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ClearValue(ForegroundProperty);
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}
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}
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}
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if (newLayer != null)
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{
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Children.Insert(0, newLayer);
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if (newLayer is IMapLayer mapLayer)
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{
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if (mapLayer.MapBackground != null)
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{
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Background = mapLayer.MapBackground;
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}
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if (mapLayer.MapForeground != null)
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{
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Foreground = mapLayer.MapForeground;
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}
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}
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}
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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(new Point(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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var center = Center;
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AdjustCenterProperty(CenterProperty, ref 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 AdjustCenterProperty(DependencyProperty property, ref Location center)
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{
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var c = center;
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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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if (center != c)
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{
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SetValueInternal(property, center);
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}
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}
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private void CenterPropertyChanged(Location center)
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{
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if (!internalPropertyChange)
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{
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AdjustCenterProperty(CenterProperty, ref center);
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UpdateTransform();
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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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}
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}
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private void TargetCenterPropertyChanged(Location targetCenter)
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{
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if (!internalPropertyChange)
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{
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AdjustCenterProperty(TargetCenterProperty, ref targetCenter);
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if (!targetCenter.Equals(Center))
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{
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if (centerAnimation != null)
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{
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centerAnimation.Completed -= CenterAnimationCompleted;
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}
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centerAnimation = new PointAnimation
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{
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From = new Point(Center.Longitude, Center.Latitude),
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To = new Point(ConstrainedLongitude(targetCenter.Longitude), targetCenter.Latitude),
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Duration = AnimationDuration,
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EasingFunction = AnimationEasingFunction
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};
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centerAnimation.Completed += CenterAnimationCompleted;
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this.BeginAnimation(CenterPointProperty, centerAnimation);
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}
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}
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}
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private void CenterAnimationCompleted(object sender, object e)
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{
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if (centerAnimation != null)
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{
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centerAnimation.Completed -= CenterAnimationCompleted;
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centerAnimation = null;
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this.BeginAnimation(CenterPointProperty, null);
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}
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}
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private void CenterPointPropertyChanged(Location center)
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{
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if (centerAnimation != null)
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{
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SetValueInternal(CenterProperty, center);
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UpdateTransform();
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}
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}
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|
|
private void MinZoomLevelPropertyChanged(double minZoomLevel)
|
|
{
|
|
if (minZoomLevel < 0d || minZoomLevel > MaxZoomLevel)
|
|
{
|
|
minZoomLevel = Math.Min(Math.Max(minZoomLevel, 0d), MaxZoomLevel);
|
|
|
|
SetValueInternal(MinZoomLevelProperty, minZoomLevel);
|
|
}
|
|
|
|
if (ZoomLevel < minZoomLevel)
|
|
{
|
|
ZoomLevel = minZoomLevel;
|
|
}
|
|
}
|
|
|
|
private void MaxZoomLevelPropertyChanged(double maxZoomLevel)
|
|
{
|
|
if (maxZoomLevel < MinZoomLevel)
|
|
{
|
|
maxZoomLevel = MinZoomLevel;
|
|
|
|
SetValueInternal(MaxZoomLevelProperty, maxZoomLevel);
|
|
}
|
|
|
|
if (ZoomLevel > maxZoomLevel)
|
|
{
|
|
ZoomLevel = maxZoomLevel;
|
|
}
|
|
}
|
|
|
|
private void AdjustZoomLevelProperty(DependencyProperty property, ref double zoomLevel)
|
|
{
|
|
if (zoomLevel < MinZoomLevel || zoomLevel > MaxZoomLevel)
|
|
{
|
|
zoomLevel = Math.Min(Math.Max(zoomLevel, MinZoomLevel), MaxZoomLevel);
|
|
|
|
SetValueInternal(property, zoomLevel);
|
|
}
|
|
}
|
|
|
|
private void ZoomLevelPropertyChanged(double zoomLevel)
|
|
{
|
|
if (!internalPropertyChange)
|
|
{
|
|
AdjustZoomLevelProperty(ZoomLevelProperty, ref zoomLevel);
|
|
UpdateTransform();
|
|
|
|
if (zoomLevelAnimation == null)
|
|
{
|
|
SetValueInternal(TargetZoomLevelProperty, zoomLevel);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void TargetZoomLevelPropertyChanged(double targetZoomLevel)
|
|
{
|
|
if (!internalPropertyChange)
|
|
{
|
|
AdjustZoomLevelProperty(TargetZoomLevelProperty, ref targetZoomLevel);
|
|
|
|
if (targetZoomLevel != ZoomLevel)
|
|
{
|
|
if (zoomLevelAnimation != null)
|
|
{
|
|
zoomLevelAnimation.Completed -= ZoomLevelAnimationCompleted;
|
|
}
|
|
|
|
zoomLevelAnimation = new DoubleAnimation
|
|
{
|
|
To = targetZoomLevel,
|
|
Duration = AnimationDuration,
|
|
EasingFunction = AnimationEasingFunction
|
|
};
|
|
|
|
zoomLevelAnimation.Completed += ZoomLevelAnimationCompleted;
|
|
|
|
this.BeginAnimation(ZoomLevelProperty, zoomLevelAnimation);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void ZoomLevelAnimationCompleted(object sender, object e)
|
|
{
|
|
if (zoomLevelAnimation != null)
|
|
{
|
|
SetValueInternal(ZoomLevelProperty, TargetZoomLevel);
|
|
UpdateTransform(true);
|
|
|
|
zoomLevelAnimation.Completed -= ZoomLevelAnimationCompleted;
|
|
zoomLevelAnimation = null;
|
|
|
|
this.BeginAnimation(ZoomLevelProperty, null);
|
|
}
|
|
}
|
|
|
|
private void AdjustHeadingProperty(DependencyProperty property, ref double heading)
|
|
{
|
|
if (heading < 0d || heading > 360d)
|
|
{
|
|
heading = ((heading % 360d) + 360d) % 360d;
|
|
|
|
SetValueInternal(property, heading);
|
|
}
|
|
}
|
|
|
|
private void HeadingPropertyChanged(double heading)
|
|
{
|
|
if (!internalPropertyChange)
|
|
{
|
|
AdjustHeadingProperty(HeadingProperty, ref heading);
|
|
UpdateTransform();
|
|
|
|
if (headingAnimation == null)
|
|
{
|
|
SetValueInternal(TargetHeadingProperty, heading);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void TargetHeadingPropertyChanged(double targetHeading)
|
|
{
|
|
if (!internalPropertyChange)
|
|
{
|
|
AdjustHeadingProperty(TargetHeadingProperty, ref targetHeading);
|
|
|
|
if (targetHeading != Heading)
|
|
{
|
|
var delta = targetHeading - Heading;
|
|
|
|
if (delta > 180d)
|
|
{
|
|
delta -= 360d;
|
|
}
|
|
else if (delta < -180d)
|
|
{
|
|
delta += 360d;
|
|
}
|
|
|
|
if (headingAnimation != null)
|
|
{
|
|
headingAnimation.Completed -= HeadingAnimationCompleted;
|
|
}
|
|
|
|
headingAnimation = new DoubleAnimation
|
|
{
|
|
By = delta,
|
|
Duration = AnimationDuration,
|
|
EasingFunction = AnimationEasingFunction
|
|
};
|
|
|
|
headingAnimation.Completed += HeadingAnimationCompleted;
|
|
|
|
this.BeginAnimation(HeadingProperty, headingAnimation);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void HeadingAnimationCompleted(object sender, object e)
|
|
{
|
|
if (headingAnimation != null)
|
|
{
|
|
SetValueInternal(HeadingProperty, TargetHeading);
|
|
UpdateTransform();
|
|
|
|
headingAnimation.Completed -= HeadingAnimationCompleted;
|
|
headingAnimation = null;
|
|
|
|
this.BeginAnimation(HeadingProperty, null);
|
|
}
|
|
}
|
|
|
|
private void SetValueInternal(DependencyProperty property, object value)
|
|
{
|
|
internalPropertyChange = true;
|
|
|
|
SetValue(property, value);
|
|
|
|
internalPropertyChange = false;
|
|
}
|
|
|
|
private void UpdateTransform(bool resetTransformCenter = false, bool projectionChanged = false)
|
|
{
|
|
var transformCenterChanged = false;
|
|
var viewScale = ViewTransform.ZoomLevelToScale(ZoomLevel);
|
|
var projection = MapProjection;
|
|
|
|
projection.Center = ProjectionCenter ?? Center;
|
|
|
|
var mapCenter = projection.LocationToMap(transformCenter ?? Center);
|
|
|
|
if (MapProjection.IsValid(mapCenter))
|
|
{
|
|
ViewTransform.SetTransform(mapCenter, viewCenter, viewScale, -Heading);
|
|
|
|
if (transformCenter != null)
|
|
{
|
|
var center = ViewToLocation(new Point(RenderSize.Width / 2d, RenderSize.Height / 2d));
|
|
|
|
if (center != null)
|
|
{
|
|
center.Longitude = Location.NormalizeLongitude(center.Longitude);
|
|
|
|
if (center.Latitude < -maxLatitude || center.Latitude > maxLatitude)
|
|
{
|
|
center.Latitude = Math.Min(Math.Max(center.Latitude, -maxLatitude), maxLatitude);
|
|
resetTransformCenter = true;
|
|
}
|
|
|
|
SetValueInternal(CenterProperty, center);
|
|
|
|
if (centerAnimation == null)
|
|
{
|
|
SetValueInternal(TargetCenterProperty, center);
|
|
}
|
|
|
|
if (resetTransformCenter)
|
|
{
|
|
// Check if transform center moved across the dateline.
|
|
//
|
|
transformCenterChanged = Math.Abs(center.Longitude - transformCenter.Longitude) > 180d;
|
|
|
|
ResetTransformCenter();
|
|
|
|
projection.Center = ProjectionCenter ?? Center;
|
|
|
|
mapCenter = projection.LocationToMap(center);
|
|
|
|
if (MapProjection.IsValid(mapCenter))
|
|
{
|
|
ViewTransform.SetTransform(mapCenter, viewCenter, viewScale, -Heading);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
SetViewScale(ViewTransform.Scale);
|
|
|
|
// Check if view center moved across the dateline.
|
|
//
|
|
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);
|
|
|
|
ViewportChanged?.Invoke(this, e);
|
|
}
|
|
}
|
|
}
|