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====== Source Code DesktopEditionSample VertexTolerance CS 091210.zip ======


====Program.cs====

<code csharp>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
namespace VertexTolerance
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new TestForm());
        }
    }
}
</code>



====TestForm.cs====

<code csharp>
using System;
using System.IO;
using System.Windows.Forms;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.DesktopEdition;
namespace  VertexTolerance
{
    public partial class TestForm : Form
    {
        public TestForm()
        {
            InitializeComponent();
        }
        private void TestForm_Load(object sender, EventArgs e)
        {
            winformsMap1.MapUnit = GeographyUnit.DecimalDegree;
            winformsMap1.CurrentExtent = new RectangleShape(-97.7591, 30.3126, -97.7317, 30.2964);
            winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.FromArgb(255, 198, 255, 255));
            //Displays the World Map Kit as a background.
            ThinkGeo.MapSuite.DesktopEdition.WorldMapKitWmsDesktopOverlay worldMapKitDesktopOverlay = new ThinkGeo.MapSuite.DesktopEdition.WorldMapKitWmsDesktopOverlay();
            winformsMap1.Overlays.Add(worldMapKitDesktopOverlay);
            string fileName1 = @"..\..\data\polygon.txt";
            StreamReader sr1 = new StreamReader(fileName1);
            //VertexToleranceEditInteractiveOverlay to keep a set tolerance between the dragged control point and other control points of the edit shape.
            VertexToleranceEditInteractiveOverlay vertexToleranceEditInteractiveOverlay = new VertexToleranceEditInteractiveOverlay();
            vertexToleranceEditInteractiveOverlay.EditShapesLayer.InternalFeatures.Add("Polygon", new Feature(BaseShape.CreateShapeFromWellKnownData(sr1.ReadLine())));
            //Sets the PointStyle for the non dragged control points.
            vertexToleranceEditInteractiveOverlay.ControlPointStyle = new PointStyle(PointSymbolType.Circle, new GeoSolidBrush(GeoColor.StandardColors.PaleGoldenrod), new GeoPen(GeoColor.StandardColors.Black), 8);
            //Sets the PointStyle for the dragged control points.
            vertexToleranceEditInteractiveOverlay.DraggedControlPointStyle = new PointStyle(PointSymbolType.Circle, new GeoSolidBrush(GeoColor.StandardColors.Red), new GeoPen(GeoColor.StandardColors.Orange, 2), 10);
            vertexToleranceEditInteractiveOverlay.CanDrag = false;
            vertexToleranceEditInteractiveOverlay.Tolerance = 100;
            vertexToleranceEditInteractiveOverlay.ToleranceUnit = DistanceUnit.Meter;
            vertexToleranceEditInteractiveOverlay.CalculateAllControlPoints();

            winformsMap1.EditOverlay = vertexToleranceEditInteractiveOverlay;
            winformsMap1.Refresh();
        }
        private void winformsMap1_MouseMove(object sender, MouseEventArgs e)
        {
            //Displays the X and Y in screen coordinates.
            statusStrip1.Items["toolStripStatusLabelScreen"].Text = "X:" + e.X + " Y:" + e.Y;
            //Gets the PointShape in world coordinates from screen coordinates.
            PointShape pointShape = ExtentHelper.ToWorldCoordinate(winformsMap1.CurrentExtent, new ScreenPointF(e.X, e.Y), winformsMap1.Width, winformsMap1.Height);
            //Displays world coordinates.
            statusStrip1.Items["toolStripStatusLabelWorld"].Text = "(world) X:" + Math.Round(pointShape.X, 4) + " Y:" + Math.Round(pointShape.Y, 4);
        }
        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private void winformsMap1_MouseUp(object sender, MouseEventArgs e)
        {
            //Gets the PointShape in world coordinates from screen coordinates.
            PointShape pointShape = ExtentHelper.ToWorldCoordinate(winformsMap1.CurrentExtent, new ScreenPointF(e.X, e.Y), winformsMap1.Width, winformsMap1.Height);
            System.Diagnostics.Debug.WriteLine(pointShape.X + " " + pointShape.Y);
        }
    }
}
</code>



====VertexToleranceEditInteractiveOverlay.cs====

<code csharp>
using System.Collections.ObjectModel;
using System.Collections.Generic;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.DesktopEdition;
namespace VertexTolerance
{
    class VertexToleranceEditInteractiveOverlay : EditInteractiveOverlay
    {
        private PointStyle controlPointStyle;
        private PointStyle draggedControlPointStyle;
        private double tolerance;
        private DistanceUnit toleranceUnit;
        private GeographyUnit geographyUnit;
        //Property for the non dragged control point style.
        public PointStyle ControlPointStyle
        {
            get { return controlPointStyle; }
            set { controlPointStyle = value; }
        }
        //Property for the dragged control point style.
        public PointStyle DraggedControlPointStyle
        {
            get { return draggedControlPointStyle; }
            set { draggedControlPointStyle = value; }
        }
        //Toerance distance to keep on the control points
        public double Tolerance
        {
            get { return tolerance; }
            set { tolerance = value; }
        }
        public DistanceUnit ToleranceUnit
        {
            get { return toleranceUnit; }
            set { toleranceUnit = value; }
        }
        //Overrides the MoveVertexCore to have the logic to not allow dragged control within the tolerance area.
        protected override Feature MoveVertexCore(Feature sourceFeature, PointShape sourceControlPoint, PointShape targetControlPoint)
        {
            VertexMovingEditInteractiveOverlayEventArgs vertexMovingEditInteractiveOverlayEventArgs = new VertexMovingEditInteractiveOverlayEventArgs(false, sourceFeature, new Vertex(targetControlPoint));
            ExistingControlPointsLayer.Open();
            Collection<Feature> controlPoints = ExistingControlPointsLayer.FeatureSource.GetAllFeatures(ReturningColumnsType.AllColumns);
            EllipseShape toleranceEllipse = null;
            //Loops thru the control points.
            foreach (Feature feature in controlPoints)
            {
                //Checks the distance of dragged control point to the other control points to know if within tolerance or not and
                //gets the tolerance ellipseShape.
                if (feature.ColumnValues["state"] != "selected")
                {
                    PointShape pointShape = (PointShape)feature.GetShape();
                    double Dist = pointShape.GetDistanceTo(targetControlPoint, geographyUnit, toleranceUnit);
                    if (Dist <= Tolerance)
                    {
                        toleranceEllipse = new EllipseShape(pointShape, tolerance, geographyUnit, toleranceUnit);
                        break;
                    }
                }
            }
            //If within tolerance.
            if (toleranceEllipse != null)
            {
                //If within tolerance gets other EllipseShapes within tolerance.
                EllipseShape[] neighborEllipseShapes = GetNeighborEllipseShapes(toleranceEllipse);
                //Unions and gets the LineShape (perimeter) of the unioned MultipolygonShape.
                //Then we get the closet point to mouse pointer on the lineShape to have the effect of the dragged control point
                //staying outside the tolerance.
                MultipolygonShape unionMultiPolygonShape = PolygonShape.Union(neighborEllipseShapes);
                LineShape ellipseLineShape = ToLineShape(unionMultiPolygonShape);
                PointShape onEllipsePointShape = ellipseLineShape.GetClosestPointTo(targetControlPoint, geographyUnit);
                vertexMovingEditInteractiveOverlayEventArgs.MovingVertex = new Vertex(onEllipsePointShape);
            }
            return base.MoveVertexCore(sourceFeature, sourceControlPoint, new PointShape(vertexMovingEditInteractiveOverlayEventArgs.MovingVertex));
        }
        private  EllipseShape[] GetNeighborEllipseShapes( EllipseShape ellipseShape)
        {
            ExistingControlPointsLayer.Open();
            Collection<Feature> controlPoints = ExistingControlPointsLayer.FeatureSource.GetAllFeatures(ReturningColumnsType.AllColumns);
            List<EllipseShape> neighborEllipseShapes = new List<EllipseShape>();
            //Loops thru the control points.
            foreach (Feature feature in controlPoints)
            {
                //Looks at the value of "state" for the non dragged point controls.
                if (feature.ColumnValues["state"] != "selected")
                {
                    PointShape pointShape = (PointShape)feature.GetShape();
                    double Dist = pointShape.GetDistanceTo(ellipseShape, geographyUnit, toleranceUnit);
                    if (Dist <= Tolerance)
                    {
                        EllipseShape neighborEllipseShape = new EllipseShape(pointShape, tolerance, GeographyUnit.DecimalDegree, toleranceUnit);
                        neighborEllipseShapes.Add(neighborEllipseShape);
                    }
                }
            }
            return neighborEllipseShapes.ToArray();
        }
        private LineShape ToLineShape(MultipolygonShape multiPolygonShape)
        {
            LineShape lineShape = new LineShape();
            foreach (Vertex vertex in multiPolygonShape.Polygons[0].OuterRing.Vertices)
            {
                lineShape.Vertices.Add(vertex);
            }
            return lineShape;
        }
        //Overrides the DrawCore function to draw the Edit Layers, the vertices and tolerance ellipses,
        //and the control points.
        protected override void DrawCore(GeoCanvas canvas)
        {
            //Sets the geography Unit used in FindNearestSnappingPoint function
            geographyUnit = canvas.MapUnit;
            //Draws the Edit Shapes as default.
            Collection<SimpleCandidate> labelsInAllLayers = new Collection<SimpleCandidate>();
            EditShapesLayer.Open();
            EditShapesLayer.Draw(canvas, labelsInAllLayers);
            canvas.Flush();
            //Draws the control points.
            ExistingControlPointsLayer.Open();
            Collection<Feature> controlPoints = ExistingControlPointsLayer.FeatureSource.GetAllFeatures(ReturningColumnsType.AllColumns);
            //Loops thru the control points.
            foreach (Feature feature in controlPoints)
            {
                //Looks at the value of "state" to draw the control point as dragged or not.
                if (feature.ColumnValues["state"] != "selected")
                {
                    Feature[] features = new Feature[1] { feature };
                    controlPointStyle.Draw(features, canvas, labelsInAllLayers, labelsInAllLayers);
                    PointShape pointShape = (PointShape)feature.GetShape();
                    //Draws the ellipse.
                    EllipseShape ellipseShape = new EllipseShape(pointShape, tolerance, canvas.MapUnit, toleranceUnit);
                    canvas.DrawArea(ellipseShape, new GeoPen(GeoColor.StandardColors.Black), DrawingLevel.LevelOne);
                }
                else
                {
                    Feature[] features = new Feature[1] { feature };
                    draggedControlPointStyle.Draw(features, canvas, labelsInAllLayers, labelsInAllLayers);
                }
            }
        }
    }
}
</code>
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