Question

我正在使用此代码在ArcMap中创建文本。但是当你放大时，我似乎无法像注释文本那样进行缩放。

有谁知道怎么做？

//'First setup a color.  We'll use RGB red    
                IRgbColor pRGBcolor = new RgbColor();
                pRGBcolor.Blue = 0;
                pRGBcolor.Red = 255;
                pRGBcolor.Green = 0;

                //'Next, cocreate a new TextElement    
                ITextElement pTextElement = new TextElementClass();

                //'Query Interface (QI) to an IElement pointer and set    
                //'the geometry that was passed in    
                IElement pElement = pTextElement as IElement;
                pElement.Geometry = Point;

                //'Next, setup a font
                stdole.IFontDisp pFontDisp = new stdole.StdFont() as stdole.IFontDisp;
                pFontDisp.Name = "Arial";
                pFontDisp.Bold = true;

                //'Next, setup a TextSymbol that the TextElement will draw with    
                ITextSymbol pTextSymbol = new ESRI.ArcGIS.Display.TextSymbolClass();
                pTextSymbol.Font = pFontDisp;
                pTextSymbol.Color = pRGBcolor;
                pTextSymbol.Size = Size;
                pTextSymbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHACenter;
                pTextSymbol.VerticalAlignment = esriTextVerticalAlignment.esriTVACenter;
                pTextSymbol.Angle = Angle;
                pTextSymbol.Text = Text;

                //'set the size of the text symbol here, rather than on the font        
                //'Next, Give the TextSymbol and text string to the TextElement    
                pTextElement.Symbol = pTextSymbol;
                pTextElement.Text = pTextSymbol.Text;
                pTextElement.ScaleText = true;

                ESRI.ArcGIS.Carto.IElementProperties3 aoElementPro = pTextElement as ESRI.ArcGIS.Carto.IElementProperties3;
                aoElementPro.ReferenceScale = cGISHelpers.MapDomain.Map.MapScale;

Answer 1

据我所知，你不能让TextSymbol随地图一起缩放。这是因为TextElement不能根据地图的范围进行更改，而是使用字体大小来确定它在屏幕上显示的大小。

在我仍然使用TextSymbol时，我能想到的最好的方法是更改点大小（如果范围足够大，则隐藏/显示元素）随着范围的变化。我不知道“注意程度的文本控件”，这是你真正需要的。

或者，您是否只能使用注释图层或标记要更改文本大小的图层？

Answer 2

我们可以很好地添加根据比例改变大小的文本。为此，我们需要使用IElementProperties3.ReferenceScale属性。

我没有C＃代码，但我附上了一些您可以修改的示例VBA代码。

'--------------------------------
Sub ChangeTextElemRefScale()
    Dim pDoc As IMxDocument
    Dim pContainer As IGraphicsContainer
    Dim pElement As IElement
    Dim pTextElement As ITextElement
    Dim pActiveView As IActiveView

    Set pDoc = ThisDocument
    Set pActiveView = pDoc.ActiveView
    Set pContainer = pActiveView

    'Loop through the graphics container
    pContainer.Reset
    Set pElement = pContainer.Next
    While not pElement Is Nothing
        'Get the specific text element
        If TypeOf pElement Is ITextElement Then
           Set pTextElement = pElement
           If pTextElement.Text = "oregon" Then  'change this to your text element's text
                Dim pElemProp As IElementProperties3
                Set pElemProp = pTextElement
                pElemProp.ReferenceScale = 15000000
            End If
        End If
        Set pElement = pContainer.Next
    Wend

    pDoc.ActiveView.PartialRefresh esriViewGraphics, Nothing, Nothing
End Sub
'--------------------------------

Answer 3

ITextElement有一个属性ITextElement.ScaleText。将其设置为true，文本大小将自动调整。

有没有办法在ArcMap中缩放图形文本？

3 个答案: