Demo.WindowsPresentation/CustomMarkers/CircleVisual.cs

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using System;
using System.Globalization;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Effects;
using Demo.WindowsPresentation.Controls;
using GMap.NET.WindowsPresentation;

namespace Demo.WindowsPresentation.CustomMarkers
{
   public class CircleVisual : FrameworkElement
   {
      public readonly Popup Popup = new Popup();
      public readonly TrolleyTooltip Tooltip = new TrolleyTooltip();
      public readonly GMapMarker Marker;

      public CircleVisual(GMapMarker m, Brush background)
      {
         Marker = m;
         Marker.ZIndex = 100;

         Popup.AllowsTransparency = true;
         Popup.PlacementTarget = this;
         Popup.Placement = PlacementMode.Mouse;
         Popup.Child = Tooltip;
         Popup.Child.Opacity = 0.777;

         SizeChanged += new SizeChangedEventHandler(CircleVisual_SizeChanged);
         MouseEnter += new System.Windows.Input.MouseEventHandler(CircleVisual_MouseEnter);
         MouseLeave += new System.Windows.Input.MouseEventHandler(CircleVisual_MouseLeave);
         Loaded += new RoutedEventHandler(OnLoaded);

         Text = "?";

         StrokeArrow.EndLineCap = PenLineCap.Triangle;
         StrokeArrow.LineJoin = PenLineJoin.Round;

         RenderTransform = scale;

         Width = Height = 22;
         FontSize = (Width/1.55);

         Background = background;
         Angle = null;
      }

      void CircleVisual_SizeChanged(object sender, SizeChangedEventArgs e)
      {
         Marker.Offset = new System.Windows.Point(-e.NewSize.Width/2, -e.NewSize.Height/2);
         scale.CenterX = -Marker.Offset.X;
         scale.CenterY = -Marker.Offset.Y;
      }

      void OnLoaded(object sender, RoutedEventArgs e)
      {
         UpdateVisual(true);
      }