AE:读写MapFrame

最新推荐文章于 2019-10-10 11:50:06 发布

原创最新推荐文章于 2019-10-10 11:50:06 发布 · 2.5k 阅读

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#excel #图形 #c# #c

本文介绍如何使用C#实现PageLayout中的Dataframe保存及读取操作。通过实例代码展示了如何利用IPersistStream接口保存当前Dataframe到文件，并在需要时将Dataframe从文件中读取出来并展示在当前视图中。此外还提供了Dataframe的平移与缩放方法。

【注】：IPersistStream接口的类的对象进行保存和读取，如Element，Map等等，当然猜想IPersistStream能够实现读取Excel表，但还没结果。

如下用C#实现PageLayout保存和读取Dataframe 代码：

IActiveView pActiveView = null;
IPageLayout pPagelayout = null;
IPageLayoutControl pPageCtrl = null;

IMap pMap;

IGraphicsContainer pGraphicsContainer = null;

ITransform2D pTransform2D = null;//图形平移、缩放接口

pPageCtrl = axPageLayoutControl1.Object as IPageLayoutControl;
pPagelayout = pPageCtrl.PageLayout;
pActiveView = pPagelayout as IActiveView;
pMap = pActiveView.FocusMap;

pGraphicsContainer = pActiveView.GraphicsContainer;

IEnvelope pEnvBound = pMapFrame.Geometry.Envelope;

IMemoryBlobStream pMemoryBlobStream = null;
IElement pMapFrame = null;
IObjectStream pObjectStream = null;
IPersistStream pPersistStream = null;
IFrameElement pFrmElement = null;
IElementProperties pElementProperties = null;

//保存当前Dataframe至文件

sFramePath = "C://DataFrame.blb";

pFrmElement = pGraphicsContainer.FindFrame(pMap);
pMapFrame = pFrmElement as IElement;

pObjectStream = new ObjectStream();
pMemoryBlobStream = new MemoryBlobStream();

pPersistStream = pMapFrame as IPersistStream;

pObjectStream.Stream = pMemoryBlobStream;
pPersistStream.Save(pObjectStream, 1);
pMemoryBlobStream.SaveToFile(sFramePath);

//读取文件并在当前视图显示

pMemoryBlobStream = new MemoryBlobStream();
pObjectStream = new ObjectStream();
pMapFrame = new MapFrame();
pPersistStream = pMapFrame as IPersistStream;
pElementProperties = pMapFrame as IElementProperties;

pMemoryBlobStream.LoadFromFile(sFramePath);
pObjectStream.Stream = pMemoryBlobStream;
pPersistStream.Load(pObjectStream as IStream);
pElementProperties.Name = "Map1";

//平移、缩放MapFrame

IEnvelope pEnvSubMapFrm= pMapFrame.Geometry.Envelope;

doubled OffsetX = pEnvBound.XMin - pEnvSubMapFrm.XMin;
double dOffsetY = pEnvBound.YMin - pEnvSubMapFrm.YMin;
pTransform2D.Move(dOffsetX, dOffsetY);//平移
IPoint pPtOrigin = new ESRI.ArcGIS.Geometry.Point();
pPtOrigin.PutCoords(pEnvBound.XMin, pEnvBound.YMin);
dTmp = pEnvBound.Width / pEnvSubMapFrm.Width;
pTransform2D.Scale(pPtOrigin, dTmp, 1);//缩放：X方向缩放，Y方向不缩放