====== Source Code DesktopEditionSample GetFeatureClickedOn CS 100715.zip ======
====Program.cs====
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
namespace GetFeaturesClickedOn
{
static class Program
{
///
/// The main entry point for the application.
///
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new TestForm());
}
}
}
====TestForm.cs====
using System;
using System.Windows.Forms;
using System.Collections.ObjectModel;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.DesktopEdition;
namespace GetFeaturesClickedOn
{
public partial class TestForm : Form
{
public TestForm()
{
InitializeComponent();
}
private void TestForm_Load(object sender, EventArgs e)
{
winformsMap1.MapUnit = GeographyUnit.DecimalDegree;
winformsMap1.CurrentExtent = new RectangleShape(-97.7583,30.2714,-97.7444,30.2632);
winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.StandardColors.LightGoldenrodYellow);
ShapeFileFeatureLayer streetLayer = new ShapeFileFeatureLayer(@"..\..\Data\Streets.shp");
streetLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.LocalRoad1;
streetLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
LayerOverlay layerOverlay = new LayerOverlay();
layerOverlay.Layers.Add("StreetLayer", streetLayer);
winformsMap1.Overlays.Add("LayerOverlay", layerOverlay);
//InMemoryFeature to show the selected feature (the feature clicked on).
InMemoryFeatureLayer selectLayer = new InMemoryFeatureLayer();
selectLayer.Open();
selectLayer.Columns.Add(new FeatureSourceColumn("FENAME"));
selectLayer.Close();
selectLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.CreateSimpleLineStyle(GeoColor.FromArgb(150, GeoColor.StandardColors.Red), 10, true);
selectLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = TextStyles.LocalRoad1("FENAME");
selectLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
LayerOverlay selectOverlay = new LayerOverlay();
selectOverlay.Layers.Add("SelectLayer", selectLayer);
winformsMap1.Overlays.Add("SelectOverlay",selectOverlay);
winformsMap1.Refresh();
}
private void winformsMap1_MapClick(object sender, MapClickWinformsMapEventArgs e)
{
//Here we use a buffer of 15 in screen coordinate. This means that regardless of the zoom level, we will always find the nearest feature
//within 15 pixels to where we clicked.
int screenBuffer = 15;
//Logic for converting screen coordinate values to world coordinate for the spatial query. Notice that the distance buffer for the spatial query
//will change according to the zoom level while it remains the same for the screen buffer distance.
ScreenPointF clickedPointF = new ScreenPointF(e.ScreenX, e.ScreenY);
ScreenPointF bufferPointF = new ScreenPointF(clickedPointF.X + screenBuffer, clickedPointF.Y);
double distanceBuffer = ExtentHelper.GetWorldDistanceBetweenTwoScreenPoints(winformsMap1.CurrentExtent, clickedPointF, bufferPointF,
winformsMap1.Width , winformsMap1.Height, winformsMap1.MapUnit, DistanceUnit.Meter);
ShapeFileFeatureLayer streetLayer = (ShapeFileFeatureLayer)winformsMap1.FindFeatureLayer("StreetLayer");
Collection columnNames = new Collection();
columnNames.Add("FENAME");
Collection features = streetLayer.FeatureSource.GetFeaturesNearestTo(new PointShape(e.WorldX, e.WorldY),winformsMap1.MapUnit,1,columnNames,distanceBuffer,DistanceUnit.Meter);
//Adds the feature clicked on to the selected layer to be displayed as highlighed and with the name labeled.
InMemoryFeatureLayer selectLayer = (InMemoryFeatureLayer)winformsMap1.FindFeatureLayer("SelectLayer");
selectLayer.InternalFeatures.Clear();
if (features.Count > 0)
{
selectLayer.InternalFeatures.Add(features[0]);
}
//Refreshes only the select layer.
winformsMap1.Refresh(winformsMap1.Overlays["SelectOverlay"]);
}
private void winformsMap1_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(winformsMap1.CurrentExtent, new ScreenPointF(e.X, e.Y), winformsMap1.Width, winformsMap1.Height);
//Displays world coordinates.
statusStrip1.Items["toolStripStatusLabelWorld"].Text = "(world) X:" + Math.Round(pointShape.X, 4) + " Y:" + Math.Round(pointShape.Y, 4);
}
private void btnClose_Click(object sender, EventArgs e)
{
this.Close();
}
}
}