using System; using System.Collections.Generic; using System.Collections.ObjectModel; using ThinkGeo.MapSuite.Core; namespace DistanceLineStyleWithProjection { public class CustomDistanceLineStyle : LineStyle { private GeoFont geoFont; private GeoSolidBrush geoSolidBrush; private GeoPen geoPen; private DistanceUnit distanceUnit; private ManagedProj4Projection proj4; private GeographyUnit projectionUnit; public CustomDistanceLineStyle() : this(DistanceUnit.Meter,new ManagedProj4Projection(),GeographyUnit.Meter,new GeoFont(), new GeoSolidBrush(), new GeoPen()) {} public CustomDistanceLineStyle( DistanceUnit distanceUnit, ManagedProj4Projection projection,GeographyUnit projectionUnit, GeoFont geoFont, GeoSolidBrush geoSolidBrush, GeoPen geoPen) { this.distanceUnit = distanceUnit; this.proj4 = projection; this.projectionUnit = projectionUnit; this.geoFont = geoFont; this.geoSolidBrush = geoSolidBrush; this.geoPen = geoPen; } //For the font of the distance public GeoFont GeoFont { get { return geoFont; } set { geoFont = value; } } //For the color of the font public GeoSolidBrush GeoSolidBrush { get { return geoSolidBrush; } set { geoSolidBrush = value; } } //For the color of the halo of the font public GeoPen GeoPen { get { return geoPen; } set { geoPen = value; } } //For the distance unit used. public DistanceUnit DistanceUnit { get { return distanceUnit; } set { distanceUnit = value; } } //For the projection used. public ManagedProj4Projection Projection { get { return proj4; } set { proj4 = value; } } //For the unit of the external projection of Projection public GeographyUnit ProjectionUnit { get { return projectionUnit; } set { projectionUnit = value; } } protected override void DrawCore(System.Collections.Generic.IEnumerable<Feature> features, GeoCanvas canvas, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInThisLayer, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInAllLayers) { //Loops thru the features to to label the distance of each line segment at mid point based on the external projection. proj4.Open(); foreach (Feature feature in features) { LineShape lineShape = (LineShape)feature.GetShape(); for (int i = 0; i < lineShape.Vertices.Count - 1; i++) { PointShape pointShape1 = new PointShape(lineShape.Vertices[i]); PointShape pointShape2 = new PointShape(lineShape.Vertices[i|+ 1]); //Gets the projected points. PointShape projPointShape1 = (PointShape)proj4.ConvertToExternalProjection(pointShape1); PointShape projPointshape2 = (PointShape)proj4.ConvertToExternalProjection(pointShape2); //Gets the distance for the projected points. double projCurrentDist = Math.Round(projPointShape1.GetDistanceTo(projPointshape2, GeographyUnit.Meter, distanceUnit), 2); //Logic for finding the angle for the text according to the line segment orientation. LineShape tempLineShape = new LineShape(); tempLineShape.Vertices.Add(new Vertex(pointShape1)); tempLineShape.Vertices.Add(new Vertex(pointShape2)); PointShape midPointShape = tempLineShape.GetPointOnALine(StartingPoint.FirstPoint, 50); Collection<ScreenPointF> screenPointFs = new Collection<ScreenPointF>(); screenPointFs.Add(ExtentHelper.ToScreenCoordinate(canvas.CurrentWorldExtent, midPointShape, canvas.Width, canvas.Height)); double angle = GetAngleFromTwoVertices(tempLineShape.Vertices[0], tempLineShape.Vertices[1]); //Draws the label for the distance at the right angle. canvas.DrawText(projCurrentDist.ToString(), geoFont, GeoSolidBrush, geoPen, screenPointFs, DrawingLevel.LabelLevel,0, 0, (float)angle); } } proj4.Close(); } private double GetAngleFromTwoVertices(Vertex b, Vertex c) { double result; double alpha = 0; double tangentAlpha = (c.Y - b.Y) / (c.X - b.X); double Peta = Math.Atan(tangentAlpha); if (c.X > b.X) { alpha = 90 + (Peta * (180 / Math.PI)); } else if (c.X < b.X) { alpha = 270 + (Peta * (180 / Math.PI)); } else { if (c.Y > b.Y) alpha = 0; if (c.Y < b.Y) alpha = 180; } double offset; if (b.X > c.X) { offset = 90; } else { offset = - 90; } result = alpha + offset; return result; } } }
using System; using System.Configuration; using ThinkGeo.MapSuite.Core; using ThinkGeo.MapSuite.WebEdition; namespace DistanceLineStyleWithProjection { public partial class TestForm : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { Map1.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.FromHtml("#E5E3DF")); Map1.CurrentExtent = new RectangleShape(-10781223,3910007,-10776789,3907379); Map1.MapUnit = GeographyUnit.Meter; Map1.MapTools.OverlaySwitcher.Enabled = true; Map1.MapTools.MouseCoordinate.Enabled = true; //Adds the Google Map as an overlay GoogleOverlay google = new GoogleOverlay("Google Map"); google.JavaScriptLibraryUri = new Uri(ConfigurationManager.AppSettings["GoogleUri"]); google.GoogleMapType = GoogleMapType.Normal; Map1.CustomOverlays.Add(google); LineShape lineShape = new LineShape(); lineShape.Vertices.Add(new Vertex(-10778667,3909061)); lineShape.Vertices.Add(new Vertex(-10778662,3909462)); lineShape.Vertices.Add(new Vertex(-10780344,3909476)); lineShape.Vertices.Add(new Vertex(-10780344,3909032)); lineShape.Vertices.Add(new Vertex(-10780372,3908688)); lineShape.Vertices.Add(new Vertex(-10780645,3908717)); InMemoryFeatureLayer inMemoryFeatureLayer = new InMemoryFeatureLayer(); //Adds the CustomDistanceLineStyle for displaying the distance in meter at mid point for each line segment. //The external projection is State Plane Texas North Central for a more accurate distance than with Google map //projection (Spherical Mercator). The unit of the State Plane projection is Meter. ManagedProj4Projection proj4 = new ManagedProj4Projection(); proj4.InternalProjectionParametersString = ManagedProj4Projection.GetGoogleMapParametersString(); proj4.ExternalProjectionParametersString = ManagedProj4Projection.GetEsriParametersString(102338); CustomDistanceLineStyle customDisctanceLineStyle = new CustomDistanceLineStyle(DistanceUnit.Meter,proj4,GeographyUnit.Meter, new GeoFont("Arial",12,DrawingFontStyles.Bold), new GeoSolidBrush(GeoColor.StandardColors.Black), new GeoPen(GeoColor.StandardColors.White)); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(customDisctanceLineStyle); //Adds a regular LineStyle for displaying in red the LineShape. LineStyle lineStyle = new LineStyle(new GeoPen(GeoColor.FromArgb(150, GeoColor.StandardColors.Red), 5)); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(lineStyle); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; inMemoryFeatureLayer.InternalFeatures.Add(new Feature(lineShape)); LayerOverlay layerOverlay = new LayerOverlay("LineOverlay", false, TileType.SingleTile); layerOverlay.TransitionEffect = TransitionEffect.None; layerOverlay.Layers.Add(inMemoryFeatureLayer); Map1.CustomOverlays.Add(layerOverlay); } } } }
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestForm.aspx.cs" Inherits="DistanceLineStyleWithProjection.TestForm" %> <%@ Register Assembly="WebEdition" Namespace="ThinkGeo.MapSuite.WebEdition" TagPrefix="cc1" %> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <link href="~/theme/default/samplepic/style.css" rel="stylesheet" type="text/css" /> <title>Distance Line Style with Projection</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <cc1:Map ID="Map1" runat="server" Height="100%" Width="100%"> </cc1:Map> <%-- <description:descriptionpanel ID="DescPanel" runat="server"> This sample displays a google map. Click buttons below to switch between different Google maps. <br /> <br /> <asp:Button CssClass="btn" ID="btnRoad" runat="server" Text="Normal" OnClientClick="Map1.SetCurrentBackgroundMapType(G_NORMAL_MAP); return false;" /> <asp:Button CssClass="btn" ID="btnAerial" runat="server" Text="Hybrid" OnClientClick="Map1.SetCurrentBackgroundMapType(G_HYBRID_MAP); return false;" /><br /> <asp:Button CssClass="btn" ID="btnSatellite" runat="server" Text="Satellite" OnClientClick="Map1.SetCurrentBackgroundMapType(G_SATELLITE_MAP); return false;" /> <asp:Button CssClass="btn" ID="btnPhysical" runat="server" Text="Physical" OnClientClick="Map1.SetCurrentBackgroundMapType(G_PHYSICAL_MAP); return false;" /> </description:descriptionpanel>--%> </form> </body> </html>