using System;
using System.Windows.Forms;
using System.Collections.ObjectModel;
using System.IO;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.DesktopEdition;
using System.Collections.Generic;

namespace  DraggedPointStyle
{
    public partial class TestForm : Form
    {
      TrackInteractiveOverlay featureOverlay = null;
      EditInteractiveOverlay selectedFeatureOverlay = null;

        public TestForm()
        {
            InitializeComponent();
        }

        private void TestForm_Load(object sender, EventArgs e)
        {
          winformsMap1.MapUnit = GeographyUnit.Meter;

          // create a overlay with a selectable line feature
          featureOverlay = new TrackInteractiveOverlay();
          List<Vertex> LineSegmentPoints = new List<Vertex>();
          LineSegmentPoints.Add(new Vertex(150, 150));
          LineSegmentPoints.Add(new Vertex(300, 900));
          Feature f = new Feature(new LineShape(LineSegmentPoints));
          featureOverlay.TrackShapeLayer.InternalFeatures.Add(f);
          winformsMap1.Overlays.Add(featureOverlay);

          // create a overlay in which a selected feature can be editted
          selectedFeatureOverlay = new MyEditOverlay();
          winformsMap1.EditOverlay = selectedFeatureOverlay;
                    
          winformsMap1.MapClick += new EventHandler<MapClickWinformsMapEventArgs>(winformsMap1_MapClick);
          winformsMap1.CurrentExtent = new RectangleShape(0,1000, 1000, 0);
          winformsMap1.Refresh();
        }

        void winformsMap1_MapClick(object sender, MapClickWinformsMapEventArgs e) {
          // deselect all selected features
          foreach (Feature selectedFeature in selectedFeatureOverlay.EditShapesLayer.InternalFeatures) {
            featureOverlay.TrackShapeLayer.InternalFeatures.Add(selectedFeature);
          }
          selectedFeatureOverlay.EditShapesLayer.InternalFeatures.Clear();

          // collect clicked on features
          int screenBuffer = 15;
          ScreenPointF clickedPointF = new ScreenPointF(e.ScreenX, e.ScreenY);
          ScreenPointF bufferPointF = new ScreenPointF(clickedPointF.X + screenBuffer, clickedPointF.Y);
          double distanceBuffer = ExtentHelper.GetWorldDistanceBetweenTwoScreenPoints(winformsMap1.CurrentExtent, clickedPointF, bufferPointF, winformsMap1.Width, winformsMap1.Height, winformsMap1.MapUnit, DistanceUnit.Meter);
          Collection<string> columnNames = new Collection<string>();
          Collection<Feature> toBeSelectedFeatures = featureOverlay.TrackShapeLayer.FeatureSource.GetFeaturesNearestTo(new PointShape(e.WorldX, e.WorldY), winformsMap1.MapUnit, 1, columnNames, distanceBuffer, DistanceUnit.Meter);
          
          // if the user clicked on a feature, move it to be editable
          if (toBeSelectedFeatures.Count > 0) {
            foreach (Feature toBeSelectedFeature in toBeSelectedFeatures) {
              selectedFeatureOverlay.EditShapesLayer.InternalFeatures.Add(toBeSelectedFeature);
            }
            featureOverlay.TrackShapeLayer.InternalFeatures.Clear();
          }

          selectedFeatureOverlay.CalculateAllControlPoints();
          winformsMap1.Refresh(selectedFeatureOverlay);
          winformsMap1.Refresh(featureOverlay);
        }

    }

    class MyEditOverlay : EditInteractiveOverlay {
     // protected override void DrawCore(GeoCanvas canvas) {
     // Collection<SimpleCandidate> labelsInAllLayers = new Collection<SimpleCandidate>();
     // EditShapesLayer.Open();
     // EditShapesLayer.Draw(canvas, labelsInAllLayers);
      
     // DragControlPointsLayer.Open();
     // DragControlPointsLayer.Draw(canvas, labelsInAllLayers);

     // canvas.Flush();
     //}
    }
}