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  • AE常用代码(标注要素、AE中画带箭头的线、如何获得投影坐标、参考坐标、投影方式、FeatureCount注意事项)

    手上的电脑已经用了将近三年了,想入手一台Surface Pro,所以计划着把电脑上的资料整理下,部分资料打算发到博客上来,资料有同事、也有自己的、也有来自网络的,来源途径太多,也没法详细注明,请见谅!

    要素标注:

    在Engine中,有一个很好的接口IGraphicsContainer,这个接口就是desktop中的临时图层,所以,要是完成一个标注功能的系统,这个接口就非常有用了。可以通过IMap、IActiveView等接口得到IGraphicsContainer,通过
    IGraphicsContainer pGC = m_HookHelper.FocusMap as IGraphicsContainer;
                pGC.Reset();
                IElement pElement = pGC.Next();
                while (pElement != null)
                {
                    ElemnetProperty pProperty = (pElement as IElementProperties2).CustomProperty as ElemnetProperty;
                    if(pProperty == null)
                    {
                        pElement = pGC.Next();
                        continue;
                    }
                }
    对其中的IElement进行遍历,通过IElement得到IElementProperties2,IElementProperties2的CustomProperty是个可读写的object属性,可以通过他保存自定义的内容,所以属性控制方面,非常方便;IElement的Geometry属性可以控制图形,图形方面的问题也得到了解决。(上段代码中的ElemnetProperty 是我自己定义的一个结构。)

    控制PageLayout显示
    PageLayout上的东西都是element,实现了两个接口IGraphicsContainer and IGraphicsContainerSelect。IGraphicsContainer包括所有pagelayout上的element,有next方法可以遍历,可以添加删除排序,IGraphicsContainerSelect has a DominantElement property for getting the selected element. 一个element又实现了IElementProperties2接口,该接口上有name属性,可以通过这个属性来get or set the name of selected element。在element的ITextElement (并非所有的elment都实现该接口可以用Typeof pElement is ITextElement判断)接口上有text属性,可以来设置其显示的文字。
    'get PageLayout

        Dim pMxDoc As IMxDocument
        Set pMxDoc = ThisDocument

        Dim pPageLayout As IPageLayout
        Set pPageLayout = pMxDoc.PageLayout

        'determine if there is one and only one element selected

        Dim pContainerSelect As IGraphicsContainerSelect
        Set pContainerSelect = pPageLayout

        If pContainerSelect.ElementSelectionCount <> 1 Then
            MsgBox "Select one element."
            Exit Sub
        End If

        'get the name property

        Dim pElement As IElementProperties2
        Set pElement = pContainerSelect.DominantElement

        Dim strName As String
        strName = InputBox("Enter a name", "Name the element")

        'set the name property
            pElement.Name = strName
    添加新图形(Adding new graphics)
    先声明一个IElement 这个接口根据需要可以在polygon, line或point 上实现。用来接收geometry;
    声明一个IFillShapeElement接口引用刚才那个对象,用它的symbol属性来设置element的属性。
    用symbol的color属性来设置颜色和透明度,outline属性来设置边框
    最后用IGraphicsContainer的add方法把element加上去。
    IElement 有geometry 属性,来接受一个geometry
    IFillShapeElement有symbol属性
    IFillSymbol有color属性来设置symbol的颜色透明度等,还有outline属性来设置边框

    AE中画带箭头的线(转贴)

    使用ICartographicLineSymbol 接口
    Private Sub UIButtonControl1_Click()
    Dim pMxDoc As IMxDocument
    Dim pGraphicsContainer As IGraphicsContainer
    Dim pActiveView As IActiveView
    Dim pLineElement As ILineElement


    Set pMxDoc = Application.Document
    Set pGraphicsContainer = pMxDoc.FocusMap
    Set pActiveView = pMxDoc.FocusMap
    pGraphicsContainer.Reset
    Set pLineElement = pGraphicsContainer.Next

    Dim aCartoLineSymbol As ICartographicLineSymbol
    Set aCartoLineSymbol = New CartographicLineSymbol
    Dim aLP As ILineProperties
    Set aLP = aCartoLineSymbol
    aLP.Offset = 0
    Dim hpe(6) As Double
    hpe(0) = 0
    hpe(1) = 7
    hpe(2) = 1
    hpe(3) = 1
    hpe(4) = 1
    hpe(5) = 0
    Dim eLineTemplate As ITemplate
    Set eLineTemplate = New Template
    eLineTemplate.Interval = 1
    Dim ix As Integer, jx As Integer
    jx = 0
    For ix = 1 To 3
    eLineTemplate.AddPatternElement hpe(jx), hpe(jx + 1)
    jx = jx + 2
    Next ix
    Set aLP.Template = eLineTemplate
    aCartoLineSymbol.Width = 2
    aCartoLineSymbol.Cap = esriLCSButt
    aCartoLineSymbol.Join = esriLJSBevel
    Dim HC As IRgbColor
    Set HC = New RgbColor
    HC.Red = 255
    HC.Green = 0
    HC.Blue = 0
    aCartoLineSymbol.Color = HC
    Dim pSymbol As ISymbol
    Set pSymbol = aCartoLineSymbol
    pLineElement.Symbol = pSymbol
    pActiveView.Refresh

    End Sub 

    引线标注

      Dim pMxDoc As IMxDocument
      Set pMxDoc = ThisDocument
     
      Dim pTextElement As ITextElement
      Set pTextElement = New TextElement
      Dim pElement As IElement
      Set pElement = pTextElement
      pTextElement.Text = "feifeiwua" & vbCrLf & "引线标注!"
     
      Dim dMidX As Double, dMidY As Double
      Dim pPoint As IPoint
    '  dMidX = (pMxDoc.ActiveView.Extent.XMax + pMxDoc.ActiveView.Extent.XMin) / 2
    '  dMidY = (pMxDoc.ActiveView.Extent.YMax + pMxDoc.ActiveView.Extent.YMin) / 2
      Set pPoint = New Point
      Set pPoint = pMxDoc.ActivatedView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y)
      dMidX = pPoint.x
      dMidY = pPoint.y
      pPoint.PutCoords dMidX, dMidY
      pElement.Geometry = pPoint
     
      Dim pTextSymbol As IFormattedTextSymbol
      Set pTextSymbol = New TextSymbol
      Dim pCallout As ICallout
      Set pCallout = New BalloonCallout
      Set pTextSymbol.Background = pCallout
      pPoint.PutCoords dMidX - pMxDoc.ActiveView.Extent.Width / 4, dMidY + pMxDoc.ActiveView.Extent.Width / 20
      pCallout.AnchorPoint = pPoint
     
      pTextElement.Symbol = pTextSymbol
      Dim pGraphicsContainer As IGraphicsContainer
      Set pGraphicsContainer = pMxDoc.ActiveView
      pGraphicsContainer.AddElement pElement, 0
      pElement.Activate pMxDoc.ActiveView.ScreenDisplay
      pMxDoc.ActiveView.PartialRefresh esriViewGraphics, Nothing, Nothing


    如何获得投影坐标、参考坐标、投影方式

    ArcMap中,View——〉Data Frame Properties——〉Coordinate System:
    有一系列的坐标及投影方式,可以通过以下方式获得
    Public Sub getSpatialReference()
        Dim pDoc As IMxDocument
        Dim pMap As IMap
       
        Set pDoc = ThisDocument
        Set pMap = pDoc.FocusMap
       
        Dim pSpatialReference As ISpatialReference
       
        Set pSpatialReference = pMap.SpatialReference
       
        Dim pProjectedCS As IProjectedCoordinateSystem
        Dim pGeographicCS As IGeographicCoordinateSystem
        Dim pProjection As IProjection
       
        Set pProjectedCS = pSpatialReference
        Set pGeographicCS = pProjectedCS.GeographicCoordinateSystem
        Set pProjection = pProjectedCS.Projection
       
        Debug.Print pProjectedCS.Name
        Debug.Print pGeographicCS.Name
        Debug.Print pProjection.Name
    End Sub

    输出结果:
    NAD_1983_StatePlane_Vermont_FIPS_4400
    GCS_North_American_1983
    Transverse_Mercator:横轴墨卡托投影


    IFeatureClass::FeatureCount注意点
    IFeatureClass.FeatureCount(ISpatialFilter):计算FeatureCount的时候,如果ISpatialFilter::Geometry过于复杂,此方法运算会使程序崩溃(比如:把道路网做缓冲合并成一个Geometry,查询程序崩溃)。
    可以采取另外的一个方法:
    IFeatureCursor = IFeatureClass.Search(ISpatialFilte*,**lse),然后遍历IFeatureCursor,获得其个数。

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  • 原文地址:https://www.cnblogs.com/wenwu/p/3304316.html
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