Style符号库在ArcGIS Engine开发中对应的是ServerStyle符号库,可以通过专门的转换程序把ArcGIS Desktop Style符号库转换为ArcGIS Engine所能够使用的ServerStyle符号库。
用于获取ServerStyle符号库中的符号主要涉及到以下:
接口名称 | 功能描述 |
IStyleGallery | 用于管理Style Gallery |
IStyleGalleryStorage | 管理Style Gallery中的符号库文件 |
IStyleGalleryClass | 控制符号库中Style Gallery Class |
IEnumStyleGalleryItem | 枚举一组Style Gallery items |
IStyleGalleryItem | 定义Style Galle ry itme |
获取ESRI符号库中名称为Rose的符号的流程:
1.首先构建一个ServerStyleGallery对象
2.其次使用IStyleGalleryStorage接口的AddFile方法加载ServerStyle文件
3.遍历ServerGallery中的Class,如果是FillSymbol使用IStyleGallery的GetItems方法返回一个可枚举的包含一系列StyleGalleryItem的EnumStyleGalleryItem对象。
4.遍历EnumServerStyleGalleryItme枚举对象中的StylegalleryItme如果名称是Rose即可获取ESRI符号库中名称为Rose的StylegalleryItme,然后通过IStyleGalleryItem的Item属性即可转换为ISymbol。
///<summary>
///获取符号库中符号
///</summary>
///<param name="sServerStylePath">符号库全路径名称</param>
///<param name="sGalleryClassName">GalleryClass名称</param>
///<param name="symbolName">符号名称</param>
///<returns>符号</returns>
private ISymbol GetSymbol(string sServerStylePath, string sGalleryClassName, string symbolName)
{
try
{
//ServerStyleGallery对象
IStyleGallery pStyleGaller = new ServerStyleGalleryClass();
IStyleGalleryStorage pStyleGalleryStorage = pStyleGaller as IStyleGalleryStorage;
IEnumStyleGalleryItem pEnumSyleGalleryItem=null;
IStyleGalleryItem pStyleGallerItem = null;
IStyleGalleryClass pStyleGalleryClass = null;
//使用IStyleGalleryStorage接口的AddFile方法加载ServerStyle文件
pStyleGalleryStorage.AddFile(sServerStylePath);
//遍历ServerGallery中的Class
for (int i = 0; i < pStyleGaller.ClassCount; i++)
{
pStyleGalleryClass = pStyleGaller.get_Class(i);
if (pStyleGalleryClass.Name != sGalleryClassName)
continue;
//获取EnumStyleGalleryItem对象
pEnumSyleGalleryItem = pStyleGaller.get_Items(sGalleryClassName, sServerStylePath, "");
pEnumSyleGalleryItem.Reset();
//遍历pEnumSyleGalleryItem
pStyleGallerItem = pEnumSyleGalleryItem.Next();
while (pStyleGallerItem != null)
{
if (pStyleGallerItem.Name == symbolName)
{
//获取符号
ISymbol pSymbol = pStyleGallerItem.Item as ISymbol;
System.Runtime.InteropServices.Marshal.ReleaseComObject(pEnumSyleGalleryItem);
System.Runtime.InteropServices.Marshal.ReleaseComObject(pStyleGalleryClass);
return pSymbol;
}
pStyleGallerItem = pEnumSyleGalleryItem.Next();
}
}
System.Runtime.InteropServices.Marshal.ReleaseComObject(pEnumSyleGalleryItem);
System.Runtime.InteropServices.Marshal.ReleaseComObject(pStyleGalleryClass);
return null;
}
catch (Exception Err)
{
MessageBox.Show(Err.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return null;
}
}
二、进行唯一值符号化
1.准备点数据,添加属性字段“类别”;
2.并为要素“类别”属性值分别设置为“Hospital2”,“School 1”,“Airport”三种属性值。
3.实现唯一值符号化功能
///<summary>
///设置要素图层唯一值符号化
///</summary>
///<param name="pFeatureLayer"></param>
private void UniqueValueRenderFlyr(IFeatureLayer pFeatureLayer)
{
try
{
//创建UniqueValueRendererClass对象
IUniqueValueRenderer pUVRender = new UniqueValueRendererClass();
List<string> pFieldValues= new List<string>();
pFieldValues.Add("Hospital 2");
pFieldValues.Add("School 1");
pFieldValues.Add("Airport");
for(int i=0;i<pFieldValues.Count;i++)
{
ISymbol pSymbol= new SimpleMarkerSymbolClass();
pSymbol =GetSymbol(@"C:Program FilesArcGISStylesESRI.ServerStyle","Marker Symbols",pFieldValues(i));
//添加唯一值符号化字段值和相对应的符号
pUVRender.AddValue(pFieldValues,pFieldValues,pSymbol);
}
//设置唯一值符号化的字段个数和字段名
pUVRender.FieldCount = 1;
pUVRender.set_Field(0, "类别");
IGeoFeatureLayer pGFeatureLyr = pFeatureLayer as IGeoFeatureLayer;
//设置IGeofeatureLayer的Renderer属性
pGFeatureLyr.Renderer = pUVRender as IFeatureRenderer;
}
catch (Exception Err)
{
MessageBox.Show(Err.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
private void button1_Click(object sender, EventArgs e)
{
IFeatureLayer pFeatureLayer = this.axMapControl1.get_Layer(0) as IFeatureLayer;
UniqueValueRenderFlyr(pFeatureLayer);
this.axMapControl1.Refresh();
}