用AE创建气泡式提示框的方法-VB.Net源码
 

 原文地址:http://www.cnblogs.com/wall/archive/2008/07/17/1244942.html

  ''' <summary>

  ''' 创建文本提示框

  ''' </summary>

  ''' <param name="x">提示框标识的位置X坐标</param>

  ''' <param name="y">提示框标识的位置Y坐标</param>

  ''' <param name="pTextString">提示框中显示的文本</param>

  ''' <param name="pPoint">提示框箭头指向的点</param>

  ''' <param name="pGraphicsContainer">包含提示框的graphicscontainer</param>

  ''' <returns></returns>

  ''' <remarks></remarks>

  Public Function
CreateTextElement(ByVal x As Double, ByVal y As Double, ByVal
pTextString As String, Optional ByVal pPoint As IPoint = Nothing,
Optional ByVal pGraphicsContainer As IGraphicsContainer = Nothing) As
IElement

    Dim pElement As IElement = New MarkerElementClass()

    Dim pTElement As IElement = New TextElementClass()

    Dim pTextSymbol As IFormattedTextSymbol = New TextSymbolClass()

    Dim pBalloonCallout As IBalloonCallout = CreateBalloonCallout(x, y)

    Dim pColor As IRgbColor = New RgbColorClass()

    pColor.Red = 150

    pColor.Green = 0

    pColor.Blue = 0

    pTextSymbol.Color = pColor

    Dim pTextBackground As ITextBackground

    pTextBackground = pBalloonCallout

    pTextSymbol.Background = pTextBackground

    pTextSymbol.Size = 8

    CType(pTElement, ITextElement).Symbol = pTextSymbol

    CType(pTElement, ITextElement).Text = pTextString

    If pPoint Is Nothing Then pPoint = New Point : pPoint.PutCoords(x + Const_Dis, y + Const_Dis)

    pTElement.Geometry = pPoint

    pGraphicsContainer.AddElement(pTElement, 1)

    Return pTElement

  End Function

  ''' <summary>

  ''' 创建balloon型提示框

  ''' </summary>

  ''' <param name="x">提示框所在位置X坐标</param>

  ''' <param name="y">提示框所在位置Y坐标</param>

  ''' <returns></returns>

  ''' <remarks></remarks>

  Public Function CreateBalloonCallout(ByVal x As Double, ByVal y As Double) As IBalloonCallout

    Dim pRgbClr As IRgbColor = New RgbColorClass()

    pRgbClr.Red = 255

    pRgbClr.Blue = 255

    pRgbClr.Green = 255

    Dim pSmplFill As ISimpleFillSymbol = New SimpleFillSymbolClass()

    pSmplFill.Color = pRgbClr

    pSmplFill.Style = esriSimpleFillStyle.esriSFSSolid

    Dim pBllnCallout As IBalloonCallout = New BalloonCalloutClass()

    pBllnCallout.Style = esriBalloonCalloutStyle.esriBCSRoundedRectangle

    pBllnCallout.Symbol = pSmplFill

    pBllnCallout.LeaderTolerance = 1

    Dim pPoint As IPoint = New ESRI.ArcGIS.Geometry.PointClass()

    pPoint.X = x

    pPoint.Y = y

    pBllnCallout.AnchorPoint = pPoint

    Return pBllnCallout

  End Function