using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.WpfDesktopEdition;

namespace CSHowDoISamples
{
    public partial class UseDraggableMarker : UserControl
    {
        private Marker draggingMarker;
        private double orignScreenX;
        private double orignScreenY;
        private IEnumerable<Marker> associateMarkers;
        private const double searchRadius = 20;

        public UseDraggableMarker()
        {
            InitializeComponent();
        }

        private void WpfMap_Loaded(object sender, RoutedEventArgs e)
        {
            wpfMap1.MapUnit = GeographyUnit.DecimalDegree;
            wpfMap1.CurrentExtent = new RectangleShape(-155.733, 95.60, 104.42, -81.9);

            WorldMapKitWmsWpfOverlay worldMapKitOverlay = new WorldMapKitWmsWpfOverlay();
            wpfMap1.Overlays.Add(worldMapKitOverlay);

            SimpleMarkerOverlay markerOverlay = new SimpleMarkerOverlay();
            markerOverlay.MarkerDragging += new EventHandler<MarkerDraggingSimpleMarkerOverlayEventArgs>(markerOverlay_MarkerDragging);
            markerOverlay.MarkerDragged += new EventHandler<MarkerDraggedSimpleMarkerOverlayEventArgs>(markerOverlay_MarkerDragged);
            markerOverlay.DragMode = MarkerDragMode.Drag;
            wpfMap1.Overlays.Add("MarkerOverlay", markerOverlay);

            Marker marker = new Marker(-95.2806, 38.9554);
            marker.MouseMove += new System.Windows.Input.MouseEventHandler(marker_MouseMove);
            marker.ImageSource = new BitmapImage(new Uri("/Resources/AQUA.png", UriKind.RelativeOrAbsolute));
            marker.Width = 20;
            marker.Height = 34;
            marker.YOffset = -17;
            markerOverlay.Markers.Add(marker);

            Marker marker1 = new Marker(-96.2806, 38.9554);
            marker1.MouseMove += new System.Windows.Input.MouseEventHandler(marker_MouseMove);
            marker1.ImageSource = new BitmapImage(new Uri("/Resources/AQUA.png", UriKind.RelativeOrAbsolute));
            marker1.Width = 20;
            marker1.Height = 34;
            marker1.YOffset = -17;
            markerOverlay.Markers.Add(marker1);

            wpfMap1.Refresh();
        }

        void marker_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
        {
            if (draggingMarker != null)
            {
                if (sender == draggingMarker)
                {
                    double newX = (double)draggingMarker.GetValue(Canvas.LeftProperty);
                    double newY = (double)draggingMarker.GetValue(Canvas.TopProperty);

                    double offsetX = newX - orignScreenX;
                    double offsetY = newY - orignScreenY;

                    foreach (Marker marker in associateMarkers)
                    {
                        if (marker != draggingMarker)
                        {
                            marker.SetValue(Canvas.LeftProperty, (double)marker.GetValue(Canvas.LeftProperty) + offsetX);
                            marker.SetValue(Canvas.TopProperty, (double)marker.GetValue(Canvas.TopProperty) + offsetY);
                        }
                    }

                    orignScreenX = newX;
                    orignScreenY = newY;
                }
            }
        }

        void markerOverlay_MarkerDragged(object sender, MarkerDraggedSimpleMarkerOverlayEventArgs e)
        {
            draggingMarker = null;

            SimpleMarkerOverlay markerOverlay = (SimpleMarkerOverlay)sender;
            foreach (Marker marker in associateMarkers)
            {
                double newX = (double)marker.GetValue(Canvas.LeftProperty);
                double newY = (double)marker.GetValue(Canvas.TopProperty);
                PointShape worldCoordinate = markerOverlay.MapArguments.ToWorldCoordinate(new PointShape(newX, newY));
                marker.Position = new Point(worldCoordinate.X, worldCoordinate.Y);
                marker.Refresh();
            }
        }

        void markerOverlay_MarkerDragging(object sender, MarkerDraggingSimpleMarkerOverlayEventArgs e)
        {
            draggingMarker = e.DraggingMarker;

            orignScreenX = (double)draggingMarker.GetValue(Canvas.LeftProperty);
            orignScreenY = (double)draggingMarker.GetValue(Canvas.TopProperty);

            SimpleMarkerOverlay markerOverlay = (SimpleMarkerOverlay)sender;
            double unitLength = markerOverlay.MapArguments.CurrentResolution * searchRadius;
            RectangleShape searchArea = new RectangleShape(draggingMarker.Position.X - unitLength, draggingMarker.Position.Y + unitLength,
                draggingMarker.Position.X + unitLength, draggingMarker.Position.Y - unitLength);

            associateMarkers = markerOverlay.Markers.Where(m => { return searchArea.Contains(new PointShape(m.Position.X, m.Position.Y)); });
        }
    }
}