第二章 使用ArcGIS Engine控件编程

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using ESRI.ArcGIS.Geodatabase;using ESRI.ArcGIS.DataSourcesFile;using ESRI.ArcGIS.Carto;using ESRI.ArcGIS.Controls;using ESRI.ArcGIS.Geometry;using ESRI.ArcGIS.Display;namespace EngineWindowsApplication2{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        int flag = 0;        private void Form1_Load(object sender, EventArgs e)        {            IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactory();            IWorkspace pWorkSpace = pWorkspaceFactory.OpenFromFile(Application.StartupPath+"\\实验一数据",0);            IFeatureWorkspace pFeatureWorkspace= pWorkSpace as IFeatureWorkspace;            IFeatureClass pFeatureClass = pFeatureWorkspace.OpenFeatureClass("塔林林场");            IFeatureLayer pFeatureLayer=new FeatureLayerClass();            pFeatureLayer.FeatureClass = pFeatureClass;            axMapControl1.AddLayer(pFeatureLayer as ILayer);            axMapControl2.AddLayer(pFeatureLayer as ILayer);        }        private void extendToolStripMenuItem_Click(object sender, EventArgs e)//fangda         {            flag = 1;            axMapControl1.MousePointer = esriControlsMousePointer.esriPointerZoomIn;        }        private void 缩小ToolStripMenuItem_Click(object sender, EventArgs e)        {            flag = 2;            axMapControl1.MousePointer = esriControlsMousePointer.esriPointerZoomOut;        }        private void 移动ToolStripMenuItem_Click(object sender, EventArgs e)        {            flag = 3;            axMapControl1.MousePointer = esriControlsMousePointer.esriPointerPan;        }        private void 全图ToolStripMenuItem_Click(object sender, EventArgs e)        {            axMapControl1.Extent = axMapControl1.FullExtent;        }        private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)        {            if (flag == 1)                axMapControl1.Extent = axMapControl1.TrackRectangle();            else if(flag==3)                axMapControl1.Pan();            else if (flag == 2)            {                IEnvelope pEnvelope = axMapControl1.Extent;                pEnvelope.Expand(2, 2, true);                axMapControl1.Extent = pEnvelope;            }        }        private void axMapControl1_OnExtentUpdated(object sender, IMapControlEvents2_OnExtentUpdatedEvent e)        {            IEnvelope envelope = (IEnvelope)e.newEnvelope;            IGraphicsContainer graphicsContainer = axMapControl2.Map as IGraphicsContainer;            IActiveView activeView = graphicsContainer as IActiveView;            //在绘图前，清除axMapControl2中的任何图形元素            graphicsContainer.DeleteAllElements();            IElement element = new RectangleElementClass();            element.Geometry = envelope;            //设置鹰眼图中的红线            //产生一个线符号对象            ILineSymbol outLineSymbol = new SimpleLineSymbolClass();            outLineSymbol.Width = 2;            outLineSymbol.Color = GetColor(255, 0, 0, 255);            //设置颜色属性            //设置填充符号的属性            IFillSymbol fillSymbol = new SimpleFillSymbolClass();            fillSymbol.Color = GetColor(9, 0, 0, 0);            fillSymbol.Outline = outLineSymbol;            IFillShapeElement fillShapeElement = element as IFillShapeElement;            fillShapeElement.Symbol = fillSymbol;            graphicsContainer.AddElement((IElement)fillShapeElement, 0);            activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);        }        private IRgbColor GetColor(int r, int g, int b, int t)        {            IRgbColor rgbColor = new RgbColorClass();            rgbColor.Red = r;            rgbColor.Green = g;            rgbColor.Blue = b;            rgbColor.Transparency = (byte)t;            return rgbColor;        }        private void axMapControl2_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)        {            IPoint point = new PointClass();            point.PutCoords(e.mapX, e.mapY);            axMapControl1.CenterAt(point);        }    }}