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ArcGIS二次开发基础教程(06)：有关图层的基本操作

0. PageLayout和MapControl 的同步

void CopyToPage()
   {
       //对象拷贝，把mapcontrol的地图拷贝重写到pagelayout里
       IObjectCopy copy = new ObjectCopyClass();
       object fromMap = axMapControl1.Map as Object;
       object toMap = axPageLayoutControl1.ActiveView.FocusMap as object;
       object copyMap = copy.Copy(fromMap) as object;
       copy.OverWrite(toMap,copyMap);
   }

//mapdontrol的事件
   void OnAfterScreenDraw(object sender, IMapControlEvents2_OnAfterScreenDrawEvent e)
   {
       //mapcontrol每次刷新都将显示范围设置为mapcontrol的视图
       IActiveView activeView =IPageLayoutControl1.ActiveView.FocusMap;
       IDisplayTransformation displayTransformation = activeView.ScreenDisplay.DisplayTransformation;
       displayTransformation.VisibleBounds = axMapControl1.Extent;
       axPageLayoutControl1.Refresh();
       CopyToPage();
   }

//mapcontrol的事件
   void OnMapReplaced(object sender, IMapControlEvents2_OnMapRepalcedEvent e)
   {
       //增添数据时调用
        CopyToPage();   
   }

1. 基本图层操作(更名，可见性，比例)，矢量图层透明度，栅格图层对比度、亮度和透明度

private IFeatureLayer GetLayerByName(string name)
{
    IFeatureLayer featureLayer = null;
    for(int i=0;i<axMapControl1.LayerCount;i++)
    {
        featureLayer = axMapControl1.get_Layer(i) as IFeatureLayer;
        if(featureLayer.Name.Equals(name))
        {
            return featureLayer;
		}
	}
    return featureLayer;
}

//此处只演示操作 故属性值写死
IFeaturLayer layer = GetLayerByName("图层名称") as IFeatureLayer;
//更名
layer.Name = "新图层名称";
//可见性
layer.Visible = false;
//比例
layer.MinimumScale = 1500000;
layer.MaximumScale = 3000000;
//透明度
IFeatureEffects featureEffects = layer as IFeatureEffects;
featureEffects.Transparency = 10;
//栅格对比度、亮度和透明度
IRasterLayer rasterLayer = GetLayerByName("图层名称") as IRasterLayer;
IFeatureEffects featureEffects = rasterLayer as IFeatureEffects;
featureEffects.Contrast = 30;//对比度
featureEffects.Brightness = 50;//亮度
featureEffects.Transparency = 100;//透明度

2. 在TOCControl中右击图层名显示菜单，单击属性栏显示图层属性表

ILayer layer = null;//定义图层为全局变量
//TOCControl的点击事件
void axTOCControl1_OnMouseDown(object sender, ITOCControlEvents_OnMouseDownEvent e)
{
    if(e.Button == 2)//如果是右击
    {
        //TOCControl提供了HitTest方法用来检测控件上被击中的item，参数详情可查阅帮助文档
        IBasicMap basicMap = new MapClass();
        //用来存储被击中的图层
        layer = new FeatureLayerClass();
        object other = new object();
        object index = new object();
        esriTOCControlItem item = esriTOCControlItem.esriTOCControlItemNone;
        axTOCControl1.HitTest(e.x, e.y, ref utem, ref layer, ref other, ref index);
        if(item == esriTOCControlItem.esriTOCControlItemLayer)
        {
            //ContextMenuStrip控件 在右键对应位置显示
            contextMenuStrip1.Show(axTOCContorl,new System.Drawing.Point(e.x, e.y));
        }
	}
}
//图层菜单的属性栏点击事件
void attributeToolStripMenuItem_Click(object sender, EventArgs e)
{
    //Attribute是我新建的窗体，构造函数用点击的图层作为参数
    Attribute attribute = new Attribute(layer);
    attribute.Show();
}
//以下是Attribute窗体中的代码
private ILayer myLayer;
public Attribute(ILayer layer)
{
    InitializeComponent();
    myLayer = layer;
}
//Attribute窗体的load事件，当窗体加载的时候把属性表显示出来
private void Attribute_Load(object sender, EventArgs e)
{
    //建表
    DataTable dt = new DataTable();
    DataColumn dc;
    //按表属性字段添加列
    for(int i=0;i<feature.Fields.FieldCount;i++)
    {
     	string name = feature.Fields.get_Field(i).Name;
        dc = new DataColumn(name);
        dc.Columns.Add(dc);
    }
    //用要素类的查询方法，获取要素指示光标(要素的遍历是通过指示光标来完成的)
    //设置查询条件为null，第二个参数True表示要素属性不可更改
    IFeatureLayer featureLayer = myLayer as IFeatureLayer;
    IFeatureCursor cursor = featureLayer.FeatureClass.Search(null,true);
    IFeature feature = cursor.Next();
    while(feature!=null)
    {
        DataRow dr = dt.NewRow();//获取表样式的行
        for(int i=0;i<feature.Fields.FieldCount;i++)
        {
            //Shape属性需匹配类型再赋值
            if(feature.get_Value(i).Name.Equals("Shape"))
            {
                switch(feature.Shape.GeometryType)
                {
                    case esriGeometryType.esriGeometryPoint:
                        dr[i] = "Point";
                        break;
                    case esriGeometryType.esriGeometryLine:
                        dr[i] = "Line";
                        break;
                    case esriGeometryType.esriGeometryPolygon:
                        dr[i] = "Polygon";
                        break;
                    case esriGeometryType.esriGeometryPolyline:
                        dr[i] = "Polyline";
                        break;
                    default:
                        dr[i] = "Other";
                        break;
                }
                continue;
            }
            //其他属性直接赋值
            dr[i] = feature.get_Value(i).ToString();
        }
        dt.Rows.Add(dr);
        feature = cursor.Next();
    }
    //用一个DataGridView控件显示表，设置数据源为上面建的表
    dataGridView1.DataSource = dt;
}

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