Question

您好，我想通过绘制圆形面实现相关图层的空间查询，请问有相关示例吗？

Answer 1

您好，可以参考示例http://support.supermap.com.cn:8090/webgl/examples/webgl/editor.html#getFeatureByGeometry，在177行添加geometry为绘制的圆形。

Answer 2

代码里有，自己找 

using SM.FM_PD.DataConversion;
using SuperMap.Data;
using SuperMap.UI;
using System;
using System.Drawing;
using SM.FM_PD.Database.ConfigManage;

namespace SM.FM_PD.PipeLine.DataQuery
{
	public enum DrawType
	{
		CreatePoint = 106,
		CreateLine = 107,
		CreatePolyline = 108,
		CreatePolygon = 109,
		CreateRectangle = 110,
		CreateCircle = 111
	}
	public class SceneDrawHelper
	{
		private SceneControl m_SceneControl;
		private DrawType m_DrawType;
		private PrjCoordSys m_DestPrjCoordSys;
		private bool m_Once;
		private GeoStyle3D m_GeoStyle3D;
		public Geometry3D Geometry3D;

		/// <summary>
		/// 场景绘制帮助对象
		/// </summary>
		/// <param name="sceneControl">场景控件</param>
		/// <param name="drawType">绘制对象类型</param>
		/// <param name="once"></param>
		public SceneDrawHelper(SceneControl sceneControl, DrawType drawType, PrjCoordSys destPrj, bool once = true)
		{
			m_SceneControl = sceneControl;
			m_DrawType = drawType;
			m_DestPrjCoordSys = destPrj;
			m_Once = once;
			m_GeoStyle3D = new GeoStyle3D()
			{
				AltitudeMode = AltitudeMode.Absolute,
				FillMode = FillMode3D.LineAndFill,
				FillForeColor = Color.LightGray,//灰色
				LineColor = Color.FromArgb(255, 255, 255, 00),//黄色
				LineWidth = 2.5,
				MarkerColor = Color.Red,
				MarkerSize = 5,
			};
			CORE_CF_STYLES model3D = BLLCommonHelper.GetOrCreateStyle("场景绘制对象风格", StyleType.GeoStyle3D, m_GeoStyle3D.ToXML());
			if (model3D == null)
				return;
			m_GeoStyle3D.FromXML(model3D.STYLEXML);//加载成功就用库里的，加载失败就用系统默认的

			loadEvent();
		}

		#region 默认绘制：绘制点、直线、折线、多边形、矩形、圆形

		private void loadEvent()
		{
			if (m_DrawType == DrawType.CreateCircle)
				m_SceneControl.Action = Action3D.CreateLine;
			else
				m_SceneControl.Action = (Action3D)Enum.Parse(typeof(Action3D), m_DrawType.ToString());
			m_SceneControl.IsCursorCustomized = true;
			m_SceneControl.Cursor = System.Windows.Forms.Cursors.Cross;

			if (m_SceneControl.Action == Action3D.CreatePoint)
			{
				m_SceneControl.Tracking -= SceneControl_Tracking;
				m_SceneControl.Tracking += SceneControl_Tracking;
			}
			else
			{
				m_SceneControl.Tracking -= SceneControl_Tracking;
				m_SceneControl.Tracking += SceneControl_Tracking;
				m_SceneControl.Tracked -= SceneControl_Tracked;
				m_SceneControl.Tracked += SceneControl_Tracked;
			}
		}

		private void SceneControl_Tracking(object sender, Tracking3DEventArgs e)
		{
			Geometry3D geo = e.Geometry;
			if (geo == null)
				return;
			if (geo is GeoPoint3D)
			{
				Geometry3D = geo;
				geo.Style3D = m_GeoStyle3D;
				m_SceneControl.Scene.TrackingLayer.Add(geo, "111");
				if (m_Once)
				{
					StopDrawing();
				}
			}
			else if (geo is GeoLine3D && m_DrawType == DrawType.CreateCircle)
			{
				GeoLine3D geoLine3D = geo as GeoLine3D;
				GeoLine geoLine = GeometryConvert.ConvertToGeoLine(geoLine3D);
				geoLine = PrjCoordSysHelper.Convert(geoLine, new PrjCoordSys(PrjCoordSysType.EarthLongitudeLatitude), m_DestPrjCoordSys, new CoordSysTransParameter(), CoordSysTransMethod.CoordinateFrame);
				if (geoLine.Length > 0)
				{
					GeoCircle3D geoCircle = new GeoCircle3D(geoLine3D[0][0], geoLine.Length);
					if (geoCircle != null)
					{
						//GeoRegion3D region3D = GeometryConvert.ConvertCircle3DToRegion3D(geoCircle);
						//region3D.Style3D = m_GeoStyle3D;
						geoCircle.Style3D = m_GeoStyle3D;
						SuperMapSceneHelper.RemoveTrackingLayerByTag(m_SceneControl, "circle");
						m_SceneControl.Scene.TrackingLayer.Add(geoCircle, "circle");
					}
				}
			}
		}

		private void SceneControl_Tracked(object sender, Tracked3DEventArgs e)
		{
			Geometry3D geo = e.Geometry;
			if (geo == null)
				return;
			if (geo is GeoLine3D && m_DrawType == DrawType.CreateCircle)
			{
				GeoLine3D geoLine3D = geo as GeoLine3D;
				GeoLine geoLine = GeometryConvert.ConvertToGeoLine(geoLine3D);
				geoLine = PrjCoordSysHelper.Convert(geoLine, new PrjCoordSys(PrjCoordSysType.EarthLongitudeLatitude), m_DestPrjCoordSys, new CoordSysTransParameter(), CoordSysTransMethod.CoordinateFrame);
				if (geoLine.Length > 0)
				{
					GeoCircle3D geoCircle = new GeoCircle3D(geoLine3D[0][0], geoLine.Length);
					if (geoCircle != null)
					{
						//GeoRegion3D region3D = GeometryConvert.ConvertCircle3DToRegion3D(geoCircle);
						//region3D.Style3D = m_GeoStyle3D;
						geoCircle.Style3D = m_GeoStyle3D;
						SuperMapSceneHelper.RemoveTrackingLayerByTag(m_SceneControl, "circle");
						m_SceneControl.Scene.TrackingLayer.Add(geoCircle, "circle");
					}
				}

			}
			else if (geo.Type != GeometryType.GeoPoint3D)
			{
				Geometry3D = geo;
				geo.Style3D = m_GeoStyle3D;
				m_SceneControl.Scene.TrackingLayer.Add(geo, "111");
			}
			if (m_Once)
			{
				StopDrawing();
			}
		}

		#endregion

		public void StopDrawing()
		{
			m_SceneControl.Tracking -= SceneControl_Tracking;
			m_SceneControl.Tracked -= SceneControl_Tracked;
			m_SceneControl.IsCursorCustomized = false;
			m_SceneControl.Action = Action3D.Pan;
		}
	}
}