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 <string> columnNames = new Collection <string>();
columnNames.Add("FENAME");
Collection <Feature> 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"]);
}
protected override void DrawCore(IEnumerable <Feature> features, GeoCanvas canvas, System.Collections.ObjectModel.Collection <SimpleCandidate> labelsInThisLayer, System.Collections.ObjectModel.Collection <SimpleCandidate> labelsInAllLayers)
{
LineShape drawingLineShape;
PointShape linePoint;
LineBaseShape lineShape;
LineStyle lineStyle = LineStyles.CreateSimpleLineStyle(GeoColor.SimpleColors.Black, 1f, false);
LineShape tangentLineShape;
ScreenPointF screenPointF;
double angle, decDistance = 0;
foreach (Feature feature in features)
{
drawingLineShape = (LineShape)feature.GetShape();
while (!(decDistance > drawingLineShape.GetLength(GeographyUnit.Meter, DistanceUnit.Kilometer)))
{
linePoint = drawingLineShape.GetPointOnALine(StartingPoint.FirstPoint, decDistance, GeographyUnit.Meter, DistanceUnit.Kilometer);
tangentLineShape = GetTangentForLinePosition(drawingLineShape, decDistance);
angle = GetAngleFromTwoVertices(tangentLineShape.Vertices[0], tangentLineShape.Vertices[1]);
angle += 90.0;
if (angle >= 360.0)
{
angle = angle - 180;
}
screenPointF = ExtentHelper.ToScreenCoordinate(canvas.CurrentWorldExtent, linePoint, (float)canvas.Width, (float)canvas.Height);
canvas.DrawText(" " + decDistance.ToString(), new GeoFont("Arial", 12, DrawingFontStyles.Bold),
new GeoSolidBrush(GeoColor.StandardColors.Black), new GeoPen(GeoColor.StandardColors.White),
new ScreenPointF[] { screenPointF }, DrawingLevel.LabelLevel, 0f, 0f, Convert.ToSingle(angle));
double dblTranslateAngle = GetOrthogonalFromVertex(tangentLineShape.Vertices[0], tangentLineShape.Vertices[1], Side.Right);
double worldDist = ExtentHelper.GetWorldDistanceBetweenTwoScreenPoints
(canvas.CurrentWorldExtent, 0, 0, 5, 0, canvas.Width, canvas.Height, GeographyUnit.Meter, DistanceUnit.Meter);
PointShape pointShape2 = (PointShape)BaseShape.TranslateByDegree
(linePoint, worldDist, dblTranslateAngle, GeographyUnit.Meter, DistanceUnit.Meter);
lineShape = new ThinkGeo.MapSuite.Core.LineShape(new ThinkGeo.MapSuite.Core.Vertex[] {
new ThinkGeo.MapSuite.Core.Vertex(linePoint),
new ThinkGeo.MapSuite.Core.Vertex(pointShape2)
});
lineStyle.Draw(new BaseShape[] { lineShape }, canvas, labelsInThisLayer, labelsInAllLayers);
decDistance += 0.1;
}
lineStyle.Draw(features, canvas, labelsInThisLayer, labelsInAllLayers);
}
}