From 14c26b34e8d17c243e628c28fcd3910162b7a13d Mon Sep 17 00:00:00 2001
From: ClemensFischer <fischer.clemens@gmail.com>
Date: Wed, 2 Nov 2022 19:49:18 +0100
Subject: [PATCH] Restore MapBase.ViewScale property

---
 MapControl/Shared/MapBase.cs      |  8 ++++++++
 MapControl/WPF/MapBase.WPF.cs     | 10 ++++++++++
 MapControl/WinUI/MapBase.WinUI.cs |  8 ++++++++
 3 files changed, 26 insertions(+)

diff --git a/MapControl/Shared/MapBase.cs b/MapControl/Shared/MapBase.cs
index f7a3b078..a2183bb2 100644
--- a/MapControl/Shared/MapBase.cs
+++ b/MapControl/Shared/MapBase.cs
@@ -215,6 +215,12 @@ namespace MapControl
             set => SetValue(AnimationEasingFunctionProperty, value);
         }
 
+        /// <summary>
+        /// Gets the scaling factor from cartesian map coordinates to view coordinates,
+        /// i.e. pixels per meter, as a read-only dependency property.
+        /// </summary>
+        public double ViewScale => (double)GetValue(ViewScaleProperty);
+
         /// <summary>
         /// Gets the ViewTransform instance that is used to transform between cartesian map coordinates
         /// and view coordinates.
@@ -770,6 +776,8 @@ namespace MapControl
                     }
                 }
 
+                SetViewScale(ViewTransform.Scale);
+
                 OnViewportChanged(new ViewportChangedEventArgs(projectionChanged, Center.Longitude - centerLongitude));
 
                 centerLongitude = Center.Longitude;
diff --git a/MapControl/WPF/MapBase.WPF.cs b/MapControl/WPF/MapBase.WPF.cs
index 1b8dfe7c..89a2d691 100644
--- a/MapControl/WPF/MapBase.WPF.cs
+++ b/MapControl/WPF/MapBase.WPF.cs
@@ -42,6 +42,11 @@ namespace MapControl
                 0d, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                 (o, e) => ((MapBase)o).TargetHeadingPropertyChanged((double)e.NewValue)));
 
+        private static readonly DependencyPropertyKey ViewScalePropertyKey = DependencyProperty.RegisterReadOnly(
+            nameof(ViewScale), typeof(double), typeof(MapBase), new PropertyMetadata(0d));
+
+        public static readonly DependencyProperty ViewScaleProperty = ViewScalePropertyKey.DependencyProperty;
+
         private static readonly DependencyProperty CenterPointProperty = DependencyProperty.Register(
             "CenterPoint", typeof(Point), typeof(MapBase), new PropertyMetadata(new Point(),
                 (o, e) =>
@@ -63,5 +68,10 @@ namespace MapControl
             ResetTransformCenter();
             UpdateTransform();
         }
+
+        private void SetViewScale(double scale)
+        {
+            SetValue(ViewScalePropertyKey, scale);
+        }
     }
 }
diff --git a/MapControl/WinUI/MapBase.WinUI.cs b/MapControl/WinUI/MapBase.WinUI.cs
index 6abe835c..1e2348da 100644
--- a/MapControl/WinUI/MapBase.WinUI.cs
+++ b/MapControl/WinUI/MapBase.WinUI.cs
@@ -43,6 +43,9 @@ namespace MapControl
             nameof(TargetHeading), typeof(double), typeof(MapBase),
             new PropertyMetadata(0d, (o, e) => ((MapBase)o).TargetHeadingPropertyChanged((double)e.NewValue)));
 
+        public static readonly DependencyProperty ViewScaleProperty = DependencyProperty.Register(
+            nameof(ViewScale), typeof(double), typeof(MapBase), new PropertyMetadata(0d));
+
         internal static readonly DependencyProperty CenterPointProperty = DependencyProperty.Register(
             "CenterPoint", typeof(Windows.Foundation.Point), typeof(MapBase),
             new PropertyMetadata(new Windows.Foundation.Point(), (o, e) =>
@@ -71,5 +74,10 @@ namespace MapControl
             ResetTransformCenter();
             UpdateTransform();
         }
+
+        private void SetViewScale(double scale)
+        {
+            SetValue(ViewScaleProperty, scale);
+        }
     }
 }