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);
}
}
}