====== Source Code ServicesEditionSample Clipping CS 090929.zip ======


====Program.cs====

<code csharp> using System;  
 using System.Collections.Generic;  
 using System.Linq;  
 using System.Windows.Forms;  
  
 namespace Clipping  
 {  
     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.Collections.Generic;  
 using System.Collections.ObjectModel;  
 using System.Drawing;  
 using System.IO;  
 using System.Windows.Forms;  
 using ThinkGeo.MapSuite.Core;  
  
 namespace Clipping  
 {  
     public partial class TestForm : Form  
     {  
         private MapEngine mapEngine = new MapEngine();  
         private Bitmap bitmap = null;  
         ShapeFileFeatureLayer worldLayer = null;  
         ShapeFileFeatureLayer evergreenLayer = null;  
  
         public TestForm()  
         {  
             InitializeComponent();  
         }  
  
         private void TestForm_Load(object sender, EventArgs e)  
         {  
             // Set the full extent and the background color  
             mapEngine.CurrentExtent = ExtentHelper.GetDrawingExtent(new RectangleShape(-99.26,16.29,-26.37,-61.48), Map.Width, Map.Height);  
             mapEngine.BackgroundFillBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);  
  
             // Adds the static layers to the MapEngine  
             //Adds the countries background layer.  
             worldLayer = new ShapeFileFeatureLayer(@"..\..\Data\Countries02.shp", ShapeFileReadWriteMode.ReadOnly);  
             worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.County1;  
             worldLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
             mapEngine.StaticLayers.Add("WorldLayer", worldLayer);  
  
             // Adds the evergreen layer to be clipped.  
             evergreenLayer = new ShapeFileFeatureLayer(@"..\..\Data\evergreen.shp", ShapeFileReadWriteMode.ReadOnly);  
             evergreenLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.StandardColors.LightGreen, GeoColor.StandardColors.DarkGreen);  
             evergreenLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
             mapEngine.StaticLayers.Add("EverGreenLayer", evergreenLayer);  
  
             //Adds the InMemoryFeatureLayer with of the polygon of Brazil used for clipping.  
             InMemoryFeatureLayer inMemoryFeatureLayer = new InMemoryFeatureLayer();  
             inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle  
                              (GeoColor.StandardColors.Transparent, GeoColor.StandardColors.Black, 1);  
             inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
  
             worldLayer.Open();  
             Collection<Feature> features = worldLayer.FeatureSource.GetFeaturesByColumnValue("cntry_name","Brazil");  
             worldLayer.Close();  
  
             inMemoryFeatureLayer.InternalFeatures.Add(features[0]);  
             mapEngine.DynamicLayers.Add(inMemoryFeatureLayer);  
  
             DrawImage();  
         }  
  
         private void btnClip_Click(object sender, EventArgs e)  
         {  
             //deletes the files for the clipped shapefile if they already exist.  
             if (File.Exists(@"..\..\Data\evergreenclip.shp"))  
             {  
                 DeleteClipFiles();  
             }  
  
             //Gets the MultipolygonShape of Brazil used for clipping.  
             worldLayer.Open();  
             Collection<Feature> features = worldLayer.FeatureSource.GetFeaturesByColumnValue("cntry_name", "Brazil");  
             worldLayer.Close();  
             MultipolygonShape multiPolygonShape = (MultipolygonShape)features[0].GetShape();  
             //Calls the ClipShapeFile function to get the clipped layer.  
             ShapeFileFeatureLayer clipLayer = ClipShapeFile(evergreenLayer, @"..\..\Data\evergreenclip.shp", multiPolygonShape);  
  
             //Adds the clipped shapefile to the mapEngine.  
             mapEngine.StaticLayers.Remove("EverGreenLayer");  
  
             //Adds the new clipped layer of evergreeen.  
             ShapeFileFeatureLayer.BuildIndexFile(@"..\..\Data\evergreenclip.shp", BuildIndexMode.DoNotRebuild);  
             clipLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.StandardColors.LightGreen, GeoColor.StandardColors.DarkGreen);  
             clipLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;  
             mapEngine.StaticLayers.Add("EverGreenClipLayer", clipLayer);  
  
             DrawImage();  
             btnClip.Enabled = false;  
         }  
  
         private ShapeFileFeatureLayer ClipShapeFile(ShapeFileFeatureLayer shapeFileFeatureLayer, string outputShapeFileFeatureLayerPath, AreaBaseShape ClippingShape)  
         {  
             //Gets the columns from the polygon based shapefile.  
             shapeFileFeatureLayer.Open();  
             Collection<DbfColumn> dbfColumns = ((ShapeFileFeatureSource)shapeFileFeatureLayer.FeatureSource).GetDbfColumns();  
  
             ShapeFileFeatureLayer.CreateShapeFile(ShapeFileType.Polygon, outputShapeFileFeatureLayerPath, dbfColumns);  
  
             ShapeFileFeatureSource clippedShapeFileFeatureSource = new ShapeFileFeatureSource(outputShapeFileFeatureLayerPath, ShapeFileReadWriteMode.ReadWrite);  
  
             //Gets the features with Spatial Query that will be used for the clipping.  
             Collection<Feature> features  = shapeFileFeatureLayer.QueryTools.GetFeaturesIntersecting(ClippingShape, ReturningColumnsType.AllColumns);  
             shapeFileFeatureLayer.Close();  
  
             //Loops thru all the features from the Spatial Query.  
             clippedShapeFileFeatureSource.Open();  
             clippedShapeFileFeatureSource.BeginTransaction();  
             foreach (Feature feature in features)  
             {  
                 //Gets the MultipolygonShape and clip it using GetIntersection geometric function.  
                 MultipolygonShape currentMultiPolygonShape = (MultipolygonShape)(feature.GetShape());  
                 MultipolygonShape overlapMultiPolygonShape = currentMultiPolygonShape.GetIntersection(ClippingShape);  
  
                 //Adds the feature to the clipped layer with the clipped Multipolygon with its ColumnValues.  
                 Dictionary<string, string> Columns = feature.ColumnValues;  
                 Feature clippedFeature = new Feature(overlapMultiPolygonShape, Columns);  
                 clippedShapeFileFeatureSource.AddFeature(clippedFeature);  
             }  
             clippedShapeFileFeatureSource.CommitTransaction();  
             clippedShapeFileFeatureSource.Close();  
  
             //Returns the clipped ShapeFileFeatureLayer.  
             ShapeFileFeatureLayer clippedShapeFileFeatureLayer = new ShapeFileFeatureLayer(outputShapeFileFeatureLayerPath);  
             return clippedShapeFileFeatureLayer;  
  
            }  
  
  
         private void DeleteClipFiles()  
         {  
             File.Delete(@"..\..\Data\evergreenclip.shp");  
             File.Delete(@"..\..\Data\evergreenclip.ids");  
             File.Delete(@"..\..\Data\evergreenclip.idx");  
             File.Delete(@"..\..\Data\evergreenclip.dbf");  
             File.Delete(@"..\..\Data\evergreenclip.shx");  
         }  
  
  
         private void DrawImage()  
         {  
             if (bitmap != null) { bitmap.Dispose(); }  
             bitmap = new Bitmap(Map.Width, Map.Height);  
             mapEngine.OpenAllLayers();  
             mapEngine.DrawStaticLayers(bitmap, GeographyUnit.DecimalDegree);  
             mapEngine.DrawDynamicLayers(bitmap, GeographyUnit.DecimalDegree);  
             mapEngine.CloseAllLayers();  
  
             Map.Image = bitmap;  
         }  
  
         private void ToolBar_ButtonClick(object sender, ToolBarButtonClickEventArgs e)  
         {  
             switch (e.Button.Tag.ToString())  
             {  
                 case "Zoom In":  
                     mapEngine.CurrentExtent.ScaleDown(50);  
                     break;  
                 case "Zoom Out":  
                     mapEngine.CurrentExtent.ScaleUp(50);  
                     break;  
                 case "Full Extent":  
                     mapEngine.CurrentExtent = ExtentHelper.GetDrawingExtent(new RectangleShape(-180.0, 83.0, 180.0, -90.0), Map.Width, Map.Height);  
                     break;  
                 case "Pan Left":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Left, 20);  
                     break;  
                 case "Pan Right":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Right, 20);  
                     break;  
                 case "Pan Up":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Up, 20);  
                     break;  
                 case "Pan Down":  
                     mapEngine.CurrentExtent = ExtentHelper.Pan(mapEngine.CurrentExtent, PanDirection.Down, 20);  
                     break;  
                 default:  
                     break;  
             }  
             DrawImage();  
         }  
  
         private void btnClose_Click(object sender, EventArgs e)  
         {  
             this.Close();  
         }  
  
  
     }  
 }  
 </code>