annotation;arcobjects
How can i get the rectangle boundary of an annotation object using ArcObjects?
Once we select an object on the map, there is a boundary as shown in the first picture.
Also is there an option to get the minimum rectangle that covers the text as shown in second picture?
I tried
IAnnotationFeature annoFeature;
annoFeature.Annotation.Geometry;
but this only gives me a polyline geometry which seems to be the baseline of text
Using arccatalog 10 sp2, I created a new (non-featurelinked) annotation featureclass with web mercator projection, xy tolerance 0.001, reference scale 1:100,000, map units meters.
I did not check the "require symbol to be selected from symbol table". Accepted all defaults for the rest.
I then went into arcmap and was able to add manually, then ran this code without any overlapping problem.
public class TestButton : ESRI.ArcGIS.Desktop.AddIns.Button
{
public TestButton()
{
}
protected override void OnClick()
{
try
{
Test();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
protected override void OnUpdate()
{
}
public void Test()
{
var editor = ArcMap.Application.FindExtensionByName("ESRI Object Editor") as IEditor;
if (editor.EditState != esriEditState.esriStateEditing)
{
MessageBox.Show("start editing first");
return;
}
var fLayer = ((IEditLayers)editor).CurrentLayer;
if(!(fLayer is IAnnotationLayer))
{
MessageBox.Show("not an anno layer");
return;
}
var pnt = ((IArea)ArcMap.Document.ActiveView.Extent).Centroid;
string s = Environment.TickCount.ToString();
try
{
editor.StartOperation();
AddAnno(fLayer.FeatureClass,pnt,s);
editor.StopOperation("add anno at center of screen");
ArcMap.Document.ActiveView.Refresh();
}
catch
{
editor.AbortOperation();
throw;
}
}
private void AddAnno(IFeatureClass featClass, IPoint pt, string textString)
{
IFeature feature = featClass.CreateFeature();
var annoClass = featClass.Extension as IAnnoClass;
IFontDisp font = new StdFontClass() as IFontDisp;
font.Name = "Arial";
font.Bold = true;
// font.Size = 30;
// load in some reasonable default values..
IFormattedTextSymbol fmtTextSymb = new TextSymbolClass();
fmtTextSymb.Font = font;
fmtTextSymb.Size = 30;
fmtTextSymb.VerticalAlignment = esriTextVerticalAlignment.esriTVABottom;
fmtTextSymb.HorizontalAlignment = esriTextHorizontalAlignment.esriTHALeft;
fmtTextSymb.Angle = 0;
fmtTextSymb.CharacterSpacing = 100;
fmtTextSymb.CharacterWidth = 100;
fmtTextSymb.FlipAngle = 90;
fmtTextSymb.Leading = 0;
fmtTextSymb.WordSpacing = 100;
fmtTextSymb.Text = textString; // my special text value..
ITextElement textElement = new TextElementClass();
textElement.Symbol = fmtTextSymb;
textElement.Text = textString;
IElement element = textElement as IElement;
element.Geometry = pt;
(feature as IAnnotationFeature2).Annotation = element;
feature.Store();
}
}
I would probably use IPolyCurve.SplitAtPoint and get the paths (parts) created after the split and do your processing on those. As long as the createPart argument is true, SplitAtPoint doesn't just add a new vertex, it inserts a new part between the split point and the end of the path.
(source: arcgis.com)
Whether this is the best approach somewhat depends on what processing you need to do however.
Best Answer
For your first example, try
IElement.QueryOutline:As for your second example, it's much more difficult, but should be possible by first converting the annotation to a multi-part polygon and then getting the minimum area bounding rectangle of that polygon.
The following two links should have enough code to get you there, or very close, but they are in VBA, not C#:
RECTANGLE_BY_WIDTHoption.