// Copyright 2010 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See the use restrictions.
// 

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using System.Windows.Forms;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Display;

namespace GlobeGraphicsToolbar
{
    public class PolygonTool : ESRI.ArcGIS.Desktop.AddIns.Tool
    {
        private PolygonGeometry _polygonGeometry = null;
        private const int LeftButton = 1;
        private const esriSRGeoCSType GeographicCoordinateSystem = esriSRGeoCSType.esriSRGeoCS_WGS1984;
        private const double PointElementSize = 1;
        private const esriSimpleMarkerStyle PointElementStyle = esriSimpleMarkerStyle.esriSMSCircle;
        private const double PolylineElementWidth = 1000;
        private const esriSimpleLineStyle PolylineElementStyle = esriSimpleLineStyle.esriSLSSolid;
        private const string GraphicsLayerName = "Globe Graphics";
        public PolygonTool()
        {
        }

        protected override void OnUpdate()
        {

        }

        protected override void OnMouseDown(ESRI.ArcGIS.Desktop.AddIns.Tool.MouseEventArgs arg)
        {
            if (arg.Button == MouseButtons.Left)
            {
                GeographicCoordinates geographicCoordinates = new GeographicCoordinates(ArcGlobe.Globe, arg.X, arg.Y);

                SpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceFactory((int)GeographicCoordinateSystem);

                PointGeometry pointGeometry = new PointGeometry(geographicCoordinates.Longitude, geographicCoordinates.Latitude, geographicCoordinates.AltitudeInKilometers, spatialReferenceFactory.SpatialReference);

                if (_polygonGeometry == null)
                {
                    _polygonGeometry = new PolygonGeometry(spatialReferenceFactory.SpatialReference);
                }

                _polygonGeometry.AddPoint(pointGeometry.Geometry as IPoint);

                TableOfContents tableOfContents = new TableOfContents(ArcGlobe.Globe);

                if (!tableOfContents.LayerExists(GraphicsLayerName))
                {
                    tableOfContents.ConstructLayer(GraphicsLayerName);
                }

                Layer layer = new Layer(tableOfContents[GraphicsLayerName]);

                if (_polygonGeometry.PointCount == 1)
                {
                    PointElement pointElement = new PointElement(pointGeometry.Geometry, PointElementSize, PointElementStyle);

                    layer.AddElement(pointElement.Element, pointElement.ElementProperties);
                }
                else
                {
                    layer.RemoveElement(layer.ElementCount - 1);

                    PolylineGeometry polylineGeometry = new PolylineGeometry(_polygonGeometry.Geometry);

                    PolylineElement polylineElement = new PolylineElement(polylineGeometry.Geometry, PolylineElementWidth, PolylineElementStyle);

                    layer.AddElement(polylineElement.Element, polylineElement.ElementProperties);
                }

                ArcGlobe.Globe.GlobeDisplay.RefreshViewers();
            }
        }

        protected override void OnDoubleClick()
        {
            if (_polygonGeometry.PointCount > 2)
            {
                TableOfContents tableOfContents = new TableOfContents(ArcGlobe.Globe);

                if (tableOfContents.LayerExists("Globe Graphics"))
                {
                    Layer layer = new Layer(tableOfContents["Globe Graphics"]);

                    layer.RemoveElement(layer.ElementCount - 1);

                    _polygonGeometry.Close();

                    PolygonElement polygonElement = new PolygonElement(_polygonGeometry.Geometry, esriSimpleFillStyle.esriSFSSolid);

                    layer.AddElement(polygonElement.Element, polygonElement.ElementProperties);

                    _polygonGeometry = null;

                    ArcGlobe.Globe.GlobeDisplay.RefreshViewers();
                }
            }
        }
    }

}