Problem:  Inserting a point of data in a map produces inaccurate results

【解决方案】
Convert the X and Y onMouseDown event arguments from screen coordinates to map coordinates using IDisplayTransformation::ToMapPoint(). The map coordinates use the coordinate system of the newly created feature’s feature class.

Below is a code sample based on the following link:
ArcObjects Help for .NET



/// The code herein is based on the Add-In sample at this link on ESRI's Resources Website:
/// http://resources.arcgis.com/en ... 00000
///

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using ESRI.ArcGIS.ArcMapUI;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geometry;


namespace AddIn_OnMouseDown_Tool
{
public class Class_OnMouseDown_Tool : ESRI.ArcGIS.Desktop.AddIns.Tool
{
// Module level variables
private IActiveView m_focusMap;
public Class_OnMouseDown_Tool()

{
}

protected override void OnUpdate()
{
Enabled = ArcMap.Application != null;
}

protected override void OnMouseDown(MouseEventArgs arg)
{

IMxDocument mxDoc = ArcMap.Document;
m_focusMap = mxDoc.FocusMap as IActiveView;
IPoint point = m_focusMap.ScreenDisplay.DisplayTransformation.ToMapPoint(arg.X, arg.Y) as IPoint;

System.Windows.Forms.MessageBox.Show(
"point.X = " + point.X + "\n" +
"point.Y = " + point.Y + "\n"
);

}
}

}





Related Information

1. ArcGIS Help: How to create a command or tool to work with the controls

Created: 3/14/2014 Last Modified: 10/23/2014

【原文链接】
http://support.esri.com/en/kno ... 42325