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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 MultiRingBuffering { 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.Drawing; using System.Windows.Forms; using System.Collections.ObjectModel; using ThinkGeo.MapSuite.Core; namespace MultiRingBuffering { public partial class TestForm : Form { private MapEngine mapEngine = new MapEngine(); private Bitmap bitmap = null; ShapeFileFeatureLayer austin10Layer; ShapeFileFeatureLayer austinSchoolsLayer; Collection<Ring> rings = new Collection<Ring>(); //Class for the ring class Ring { public double BufferDistance; public GeoColor RingColor; public MultipolygonShape RingMultipolygonShape; public Ring(double BufferDistance, GeoColor RingColor) { this.BufferDistance = BufferDistance; this.RingColor = RingColor; this.RingMultipolygonShape = 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(-97.99,30.49,-97.40,30.06), Map.Width, Map.Height); mapEngine.BackgroundFillBrush = new GeoSolidBrush(GeoColor.StandardColors.LightGoldenrodYellow); // Add the static layers to the MapEngine austin10Layer = new ShapeFileFeatureLayer(@"..\..\Data\austin10.shp", ShapeFileReadWriteMode.ReadOnly); austin10Layer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.Interstate3; austin10Layer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; austin10Layer.RequireIndex = false; mapEngine.StaticLayers.Add("austin10Layer", austin10Layer); austinSchoolsLayer = new ShapeFileFeatureLayer(@"..\..\Data\austinschools.shp", ShapeFileReadWriteMode.ReadOnly); austinSchoolsLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.CreateSimpleCircleStyle(GeoColor.StandardColors.LightGreen, 7, GeoColor.StandardColors.Black); austinSchoolsLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; austinSchoolsLayer.RequireIndex = false; mapEngine.StaticLayers.Add("austinSchoolsLayer", austinSchoolsLayer); DrawImage(); } private void btnBuffer_Click(object sender, EventArgs e) { //Sets buffer distance and color for each ring. rings.Add(new Ring(1,GeoColor.FromArgb(150,GeoColor.StandardColors.Red))); rings.Add(new Ring(3, GeoColor.FromArgb(150, GeoColor.StandardColors.DarkOrange))); rings.Add(new Ring(5, GeoColor.FromArgb(150, GeoColor.StandardColors.Orange))); rings.Add(new Ring(7, GeoColor.FromArgb(150, GeoColor.StandardColors.Yellow))); Collection<MultipolygonShape> bufferMultiPolygonShapes = new Collection<MultipolygonShape>(); austin10Layer.Open(); Collection<Feature> features = austin10Layer.FeatureSource.GetAllFeatures(ReturningColumnsType.NoColumns); austin10Layer.Close(); //Loops thru the rings to to get the buffer polygon. foreach (Ring ring in rings) { //First, get the buffer for all the features of the roads. Collection<AreaBaseShape> bufferAreaBaseShapes = new Collection<AreaBaseShape>(); foreach (Feature feature in features) { MultilineShape multiLineShape = (MultilineShape)feature.GetShape(); MultipolygonShape bufferShape = multiLineShape.Buffer(ring.BufferDistance, GeographyUnit.DecimalDegree, DistanceUnit.Kilometer); bufferAreaBaseShapes.Add(bufferShape); } //Then, union all the buffers into one compact buffer polygon. MultipolygonShape bufferMultipolygonShape = PolygonShape.Union(bufferAreaBaseShapes); bufferMultiPolygonShapes.Add(bufferMultipolygonShape); } //Builds the ring polygons from the buffer polygons. BuildMultipolygonShapeRings(bufferMultiPolygonShapes); //Loops thru the rings to create an InMemoryFeatureLayer for each. foreach (Ring ring in rings) { InMemoryFeatureLayer RingInMemoryFeatureLayer = new InMemoryFeatureLayer(); RingInMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle (ring.RingColor); RingInMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; mapEngine.DynamicLayers.Add(RingInMemoryFeatureLayer); Feature RingFeature = new Feature(ring.RingMultipolygonShape); RingInMemoryFeatureLayer.InternalFeatures.Add(RingFeature); //Gets the count of features within each ring. austinSchoolsLayer.Open(); Collection<Feature> schoolFeatures = austinSchoolsLayer.QueryTools.GetFeaturesWithin(ring.RingMultipolygonShape, ReturningColumnsType.AllColumns); lblResult.Text = lblResult.Text + ": " + schoolFeatures.Count + " feature(s) in ring of " + ring.BufferDistance + " km"; austinSchoolsLayer.Close(); } DrawImage(); } //Function for creating the Ring polygons from the buffer polygons. private void BuildMultipolygonShapeRings(Collection<MultipolygonShape> BufferMultiPolygonShapes) { rings[0].RingMultipolygonShape = (BufferMultiPolygonShapes[0]); int i = 1; for (i = 1; i <= BufferMultiPolygonShapes.Count - 1; i += 1) { MultipolygonShape ringMultipolygonShape = BufferMultiPolygonShapes[i].GetDifference(BufferMultiPolygonShapes[i|- 1]); rings[i].RingMultipolygonShape = (ringMultipolygonShape); } } 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(); } } }