ThinkGeo Cloud
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ThinkGeo Cloud
ThinkGeo UI Controls
ThinkGeo Open Source
Help and Support
External Resources
using System; using System.Collections.Generic; using System.Linq; using System.Windows.Forms; namespace NegativeBuffering { 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()); } } }
using System; using System.Collections.ObjectModel; using System.Drawing; using System.Windows.Forms; using ThinkGeo.MapSuite.Core; namespace NegativeBuffering { public partial class TestForm : Form { private MapEngine mapEngine = new MapEngine(); private Bitmap bitmap = null; public TestForm() { InitializeComponent(); } private void TestForm_Load(object sender, EventArgs e) { // Set the extent and the background color mapEngine.CurrentExtent = ExtentHelper.GetDrawingExtent(new RectangleShape(-97.7533,30.3191,-97.7261,30.3032), Map.Width, Map.Height); mapEngine.BackgroundFillBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean); //Displays the World Map Kit as a background. ThinkGeo.MapSuite.Core.WorldMapKitLayer worldMapKitLayer = new ThinkGeo.MapSuite.Core.WorldMapKitLayer(); mapEngine.StaticLayers.Add(worldMapKitLayer); //PolygonShape to buffer. PolygonShape polygonShape = new PolygonShape(); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7325,30.3164)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7359,30.3151)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7428,30.3053)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7382,30.303)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7374,30.3088)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7329,30.3115)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7325, 30.3164)); InMemoryFeatureLayer inMemoryFeatureLayer = new InMemoryFeatureLayer(); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(80, GeoColor.StandardColors.Red), GeoColor.StandardColors.Black); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; inMemoryFeatureLayer.InternalFeatures.Add("Area", new Feature(polygonShape)); InMemoryFeatureLayer BufferInMemoryFeatureLayer = new InMemoryFeatureLayer(); BufferInMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(150, GeoColor.StandardColors.Yellow), GeoColor.StandardColors.Black); BufferInMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; //Calls the BufferPolygon function to get the buffered polygon with a negative distance. MultipolygonShape bufferMultiPolygonShape = NegativeBufferPolygon(polygonShape, GeographyUnit.DecimalDegree, 50, DistanceUnit.Meter); BufferInMemoryFeatureLayer.InternalFeatures.Add("BufferArea", new Feature(bufferMultiPolygonShape)); mapEngine.DynamicLayers.Add("AreaLayer", inMemoryFeatureLayer); mapEngine.DynamicLayers.Add("BufferAreaLayer", BufferInMemoryFeatureLayer); DrawImage(); } //Negative Buffer is done in three steps. private MultipolygonShape NegativeBufferPolygon(PolygonShape polygonShape,GeographyUnit polygonShapeUnit, double distance, DistanceUnit distanceUnit) { // 1) Gets the perimeter of the polygon as a LineShape. LineShape perimeterLineShape = GetPerimeter(polygonShape); // 2) Buffers the perimeter by the set distance. MultipolygonShape bufferPerimeterMultiPolygonShape = perimeterLineShape.Buffer(distance, polygonShapeUnit, distanceUnit); // 3) Performs the geometric operation of getting the Difference of the buffered perimeter and the polygon //to get the final buffer result. MultipolygonShape bufferMultiPolygonShape = polygonShape.GetDifference(bufferPerimeterMultiPolygonShape); return bufferMultiPolygonShape; } private LineShape GetPerimeter(PolygonShape polygonShape) { LineShape perimeterLineShape = new LineShape(); foreach (Vertex vertex in polygonShape.OuterRing.Vertices) { perimeterLineShape.Vertices.Add(new Vertex(vertex.X, vertex.Y)); } return perimeterLineShape; } 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(); } private void Map_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(mapEngine.CurrentExtent, new ScreenPointF(e.X, e.Y), Map.Width, Map.Height); //Displays world coordinates. statusStrip1.Items["toolStripStatusLabelWorld"].Text = "(world) X:" + Math.Round(pointShape.X, 4) + " Y:" + Math.Round(pointShape.Y, 4); } } }