using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Runtime.InteropServices;
using SuperMapLib;
using AxSuperMapLib;


/******************************************************************
 * Copyright(c)  : 江蘇神彩科技
 * Description   : 幾何緩沖、空間查詢等
 * CreateDate    : 2007-11-4
 * Creater       : 姜素芳
 * LastChangeDate: 姜素芳
 * LastChanger   : 2007-11-12
 * Version Info  : 1.0
 * ******************************************************************/

namespace SOBufferQuery
{
    [Guid("d939f3d1-36ef-4fe3-8291-6607c53fdb69")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("SOTest.BufferBase")]    

    public class BufferBase
    {
        #region 幾何緩沖
        /// <summary>
        /// 
        /// </summary>
        /// <param name="geometry">待緩沖的幾何</param>
        /// <param name="distance">緩沖度(半徑)</param>
        /// <returns>緩沖后的幾何</returns>
        soGeometry Buffer(soGeometry geometry, double distance)
        {
            soGeoRegion objGeoRegion = null;

            //點、線、面緩沖處理
            if (geometry.Type == seGeometryType.scgPoint)
            {
                soGeoPoint tmpPoint = (soGeoPoint)geometry;
                objGeoRegion = tmpPoint.Buffer(distance, 60);

                Marshal.ReleaseComObject(tmpPoint);
                tmpPoint = null;
            }
            else if (geometry.Type == seGeometryType.scgRegion)
            {
                soGeoRegion tmpGeoRegion = (soGeoRegion)geometry;
                objGeoRegion = tmpGeoRegion.Buffer(distance, 60);

                Marshal.ReleaseComObject(tmpGeoRegion);
                tmpGeoRegion = null;
            }
            else if (geometry.Type == seGeometryType.scgLine)
            {
                soGeoLine tmpGeoLine = (soGeoLine)geometry;
                objGeoRegion = tmpGeoLine.Buffer(distance, 60);

                Marshal.ReleaseComObject(tmpGeoLine);
                tmpGeoLine = null;
            }

            return (soGeometry)objGeoRegion;
        }
        #endregion

        #region 記錄對應幾何緩沖
        /// <summary>
        /// 將指定記錄對應幾何進行緩沖
        /// </summary>
        /// <param name="recordset"></param>
        /// <param name="distance"></param>
        /// <returns>緩沖后的幾何</returns>static
        public soGeometry CreatBuffer(soRecordset recordset, double distance)
        {
            soGeometry objGeometry = recordset.GetGeometry();

            return Buffer(objGeometry, distance);
        }
        #endregion

        #region 空間包含查詢
        /// <summary>
        /// 將給定的幾何進行緩沖，然后查詢指定圖層里包含在該緩沖區內的要素，并高亮顯示
        /// </summary>
        /// <param name="superMap">地圖</param>
        /// <param name="layer">待查詢的圖層</param>
        /// <param name="geometry">緩沖后作為空間查詢區域的幾何</param>static
        public void SpatialQuery(AxSuperMap superMap, soLayer layer, soGeometry geometry)
        {
            //風格變量
            soStyle objStyle = new soStyleClass();

            #region 設置緩沖區風格
            objStyle.BrushStyle = 2;
            objStyle.BrushBackTransparent = true;
            objStyle.PenColor = (uint)ColorTranslator.ToOle(Color.Purple);
            objStyle.PenWidth = 1;
            #endregion

            //得到緩沖后的幾何
            soGeometry objGeometry = Buffer(geometry, 50);
            //轉為緩沖區域作為空間查詢區域
            soGeoRegion objGeoRegion = (soGeoRegion)objGeometry;
            //地圖跟蹤層并清除原有跟蹤
            soTrackingLayer objTrackLayer = superMap.TrackingLayer;
            objTrackLayer.ClearEvents();

            //在跟蹤層上繪出緩沖區域
            if (objGeoRegion != null)
            {
                objTrackLayer.AddEvent((soGeometry)objGeoRegion, objStyle, "");
                objTrackLayer.Refresh();
            }

            //圖層數據集
            soDataset objDataset = layer.Dataset;
            //將圖層數據集轉為矢量
            soDatasetVector objDatasetVector = (soDatasetVector)objDataset;
            //查詢指定圖層包含在緩沖區域內的要素集
            soRecordset objRsQuery = objDatasetVector.QueryEx(objGeometry, seSpatialQueryMode.scsContaining, "");

            //定義選中幾何
            soGeometry objSldGeometry = null;
            #region 設置選中幾何風格
            objStyle.BrushBackTransparent = true;
            objStyle.PenColor = (uint)ColorTranslator.ToOle(Color.Blue);
            objStyle.PenWidth = 5;
            objStyle.BrushColor = (uint)ColorTranslator.ToOle(Color.DarkRed);
            objStyle.BrushStyle = 2;
            objStyle.SymbolSize = 40;
            #endregion

            #region 高亮顯示查詢得到的要素集
            if (objRsQuery != null)
            {
                objRsQuery.MoveFirst();

                for (int i = 1; i <= objRsQuery.RecordCount; i++)
                {
                    objSldGeometry = objRsQuery.GetGeometry();
                    objRsQuery.MoveNext();
                    objTrackLayer.AddEvent(objSldGeometry, objStyle, "");
                }
            }
            #endregion

            //地圖刷新
            superMap.Refresh();

            #region 釋放COM對象
            Marshal.ReleaseComObject(objGeometry);
            objGeometry = null;
            Marshal.ReleaseComObject(objGeoRegion);
            objGeoRegion = null;
            Marshal.ReleaseComObject(objDatasetVector);
            objDatasetVector = null;
            Marshal.ReleaseComObject(objDataset);
            objDataset = null;
            Marshal.ReleaseComObject(objRsQuery);
            objRsQuery = null;
            Marshal.ReleaseComObject(objStyle);
            objStyle = null;
            Marshal.ReleaseComObject(objTrackLayer);
            objTrackLayer = null;
            #endregion
        }
        #endregion

        #region 繪制通過給定兩點的圓區域(采用了中間點緩沖的方法)
        soGeometry GetCenterPointBuffer(double x0, double y0, double x1, double y1)
        {
            double x, y, tmpx, tmpy, width, height;

            #region 確定給定兩點間的水平距離及垂直距離
            width = Math.Abs(x0 - x1);
            height = Math.Abs(y0 - y1);
            #endregion

            #region 根據x值交換兩點
            if (x0 > x1)
            {
                tmpx = x0;
                x0 = x1;
                x1 = tmpx;

                tmpy = y0;
                y0 = y1;
                y1 = tmpy;
            }
            #endregion

            #region 確定給定兩點連線的中心點坐標并轉為幾何點
            //中心點x值
            x = x0 + width / 2;
            //中心點y值
            if (y0 > y1)
                y = y0 - height / 2;
            else
                y = y0 + height / 2;

            soGeoPoint geoPoint = new soGeoPoint();
            geoPoint.x = x;
            geoPoint.y = y;
            #endregion

            //確定緩沖半徑
            double radius = Math.Sqrt(width * width + height * height) / 2;

            //返回緩沖幾何
            return Buffer((soGeometry)geoPoint, radius);
        }
        #endregion

        #region 多次空間查詢
        /// <summary>
        /// 根據給定的兩個點生成一個包含它們的圓，然后查詢出第一個圖層中與這個圓相交的記錄集(2次相交)，再查詢出第二個圖層中包含在這些記錄的緩沖域內的記錄集，最后地圖上高亮度顯示查詢出來的第一、二圖層中的記錄集
        /// </summary>
        /// <param name="superMap">地圖</param>
        /// <param name="firstLayer">第一個圖層(如河流圖層)</param>
        /// <param name="secondLayer">第二個圖層(如工廠圖層)</param>
        /// <param name="x0">第一個經緯度點的x值</param>
        /// <param name="y0">第一個經緯度點的y值</param>
        /// <param name="x1">第二個經緯度點的x值</param>
        /// <param name="y1">第二個經緯度點的y值</param>
        /// <param name="distance"></param>
        public void BufferSpatialQuery(AxSuperMap superMap, soLayer firstLayer, soLayer secondLayer, double x0, double y0, double x1, double y1, double distance)
        {
            //繪制通過給定兩點的圓區域
            soGeometry objFGeometry = GetCenterPointBuffer(x0, y0, x1, y1);

            //地圖跟蹤層,初始清空
            soTrackingLayer objTrackLayer = superMap.TrackingLayer;
            objTrackLayer.ClearEvents();

            //第一圖層查詢集的顯示風格
            soStyle objFStyle = new soStyleClass();
            objFStyle.BrushStyle = 2;
            objFStyle.BrushBackTransparent = true;
            objFStyle.PenColor = (uint)ColorTranslator.ToOle(Color.Blue);
            objFStyle.PenWidth = 5;
            objFStyle.BrushColor = (uint)ColorTranslator.ToOle(Color.DeepPink);
            //objTrackLayer.AddEvent(objFGeometry, objFStyle, "");

            //第二圖層查詢集的顯示風格
            soStyle objSStyle = new soStyleClass();
            objSStyle.BrushBackTransparent = true;
            objSStyle.PenColor = (uint)ColorTranslator.ToOle(Color.Red);
            objSStyle.PenWidth = 5;
            objSStyle.BrushColor = (uint)ColorTranslator.ToOle(Color.DarkRed);            

            //第一、二圖層的矢量數據集
            soDatasetVector objFDatasetVector = (soDatasetVector)firstLayer.Dataset;
            soDatasetVector objSDatasetVector = (soDatasetVector)secondLayer.Dataset;

            //查詢第一圖層與圓區域相交的記錄集
            soRecordset objFRsQuery = objFDatasetVector.QueryEx(objFGeometry, seSpatialQueryMode.scsAreaIntersect, "");
                        
            objFRsQuery.MoveFirst();
            for (int i = 1; i <= objFRsQuery.RecordCount; i++)
            {
                //二次查詢出第一圖層與圓區域相交的精確幾何
                soGeometry objSGeometry = objFGeometry.SpatialOperator.Intersection(objFRsQuery.GetGeometry());
                //高亮度顯示第一圖層查詢記錄
                objFStyle.PenColor = (uint)ColorTranslator.ToOle(Color.DarkViolet);
                objTrackLayer.AddEvent(objSGeometry, objFStyle, "");

                //緩沖二次相交記錄
                soGeometry objSGeometryBuffer = Buffer(objSGeometry, distance);
                //高亮顯示
                //objFStyle.PenColor = (uint)ColorTranslator.ToOle(Color.YellowGreen);
                //objTrackLayer.AddEvent(objSGeometryBuffer, objFStyle, "");

                //二次查詢記錄緩沖后與圓相交的部分,記為*
                soGeometry objTGeometry = objFGeometry.SpatialOperator.Intersection(objSGeometryBuffer);
                //二次查詢集緩沖區的顯示風格
                soStyle objTStyle = new soStyleClass();
                objTStyle.BrushStyle = 5;
                objTStyle.BrushBackTransparent = true;
                objTStyle.PenColor = (uint)ColorTranslator.ToOle(Color.MediumSpringGreen);
                objTStyle.PenWidth = 5;
                objTStyle.BrushColor = (uint)ColorTranslator.ToOle(Color.DeepSkyBlue);
                //高亮顯示
                //objTrackLayer.AddEvent(objTGeometry, objTStyle, "");

                //查詢第二圖層中包含在*內的記錄集，并高亮顯示
                soRecordset objSRsQuery = objSDatasetVector.QueryEx(objTGeometry, seSpatialQueryMode.scsContaining, "");
                objSRsQuery.MoveFirst();
                for (int j = 1; j <= objSRsQuery.RecordCount; j++)
                {
                    soGeometry objGeometry = objSRsQuery.GetGeometry();
                    objTrackLayer.AddEvent(objGeometry, objSStyle, "");

                    objSRsQuery.MoveNext();
                }

                objFRsQuery.MoveNext();
            }

            //刷新地圖
            superMap.Refresh();
        }
        #endregion
    }
}