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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 MeasurementsWithDecimalDegrees { 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 MeasurementsWithDecimalDegrees { 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(-97.7591, 30.3126, -97.7317, 30.2964), 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 polygonShape = new PolygonShape(); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7406, 30.3057)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7354, 30.3031)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7384, 30.2979)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7445, 30.3006)); polygonShape.OuterRing.Vertices.Add(new Vertex(-97.7406, 30.3057)); LineShape lineShape = new LineShape(); lineShape.Vertices.Add(new Vertex(-97.7507, 30.3093)); lineShape.Vertices.Add(new Vertex(-97.7524, 30.3065)); lineShape.Vertices.Add(new Vertex(-97.7458, 30.3033)); lineShape.Vertices.Add(new Vertex(-97.7467, 30.3017)); InMemoryFeatureLayer inMemoryFeatureLayer = new InMemoryFeatureLayer(); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(80, GeoColor.StandardColors.Red), GeoColor.StandardColors.Black); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.CreateSimpleLineStyle(GeoColor.StandardColors.Red, 3, true); inMemoryFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20; inMemoryFeatureLayer.InternalFeatures.Add("Area", new Feature(polygonShape)); inMemoryFeatureLayer.InternalFeatures.Add("Line", new Feature(lineShape)); mapEngine.DynamicLayers.Add("DynamicLayer", inMemoryFeatureLayer); //Central Texas State Plane projection. Proj4Projection StatePlaneProj4 = new Proj4Projection(); StatePlaneProj4.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4326); //Decimal Degrees (WGS 84) StatePlaneProj4.ExternalProjectionParametersString = Proj4Projection.GetEsriParametersString(102739);//State Plane Texas Central Zone unit in Feet //UTM Zone 14 N projection. Proj4Projection UTMProj4 = new Proj4Projection(); UTMProj4.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4326); //Decimal Degrees (WGS 84) UTMProj4.ExternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(26914); //UTM zone 14 N unit in meters //Gets the area of the polygon based on the default spherical geometry used for decimal degrees. double DefaultArea = Math.Round(polygonShape.GetArea(GeographyUnit.DecimalDegree, AreaUnit.SquareMeters)); lblDefaultArea.Text = System.Convert.ToString(DefaultArea); //Gets the area based on planar geometry with state plane coordinates. double StatePlaneArea = Math.Round(GetArea(polygonShape, StatePlaneProj4, GeographyUnit.Feet, AreaUnit.SquareMeters)); lblStatePlaneArea.Text = System.Convert.ToString(StatePlaneArea); //Gets the area based on planar geometry with UTM coordinates. double UTMArea = Math.Round(GetArea(polygonShape, UTMProj4, GeographyUnit.Meter, AreaUnit.SquareMeters)); lblUTMArea.Text = System.Convert.ToString(UTMArea); //Gets the length of the line based on the default spherical geometry used for decimal degrees. double DefaultDistance = Math.Round( lineShape.GetLength(GeographyUnit.DecimalDegree, DistanceUnit.Meter), 2); lblDefaultDistance.Text = System.Convert.ToString(DefaultDistance); //Gets the length of the line based on planar geometry with state plane coordinates. double StatePlaneDistance = Math.Round(GetLength(lineShape, StatePlaneProj4, GeographyUnit.Feet, DistanceUnit.Meter), 2); lblStatePlaneDistance.Text = System.Convert.ToString(StatePlaneDistance); //Gets the length of the line based on planar geometry with UTM coordiantes. double UTMDistance = Math.Round(GetLength(lineShape, UTMProj4, GeographyUnit.Meter, DistanceUnit.Meter), 2); lblUTMDistance.Text = System.Convert.ToString(UTMDistance); DrawImage(); } //Gets the Area of a area shape in decimal degrees based on the projection used. private double GetArea(AreaBaseShape areaBaseShape, Proj4Projection proj4, GeographyUnit projectionUnit, AreaUnit areaUnit) { double result = 0; proj4.Open(); AreaBaseShape projAreaBaseShape = (AreaBaseShape)proj4.ConvertToExternalProjection(areaBaseShape); result = projAreaBaseShape.GetArea(projectionUnit, areaUnit); proj4.Close(); return result; } //Gets the Length of a line shape in decimal gegrees based on the projection used. private double GetLength(LineBaseShape lineBaseShape, Proj4Projection proj4, GeographyUnit projectionUnit, DistanceUnit lengthUnit) { double result = 0; proj4.Open(); LineBaseShape projLineBaseShape = (LineBaseShape)proj4.ConvertToExternalProjection(lineBaseShape); result = projLineBaseShape.GetLength(projectionUnit, lengthUnit); proj4.Close(); return result; } 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); } } }