如何将像素坐标转为地图坐标（转载）

public System.Double ConvertPixelsToMapUnits(ESRI.ArcGIS.Carto.IActiveView activeView, System.Int32 pixelUnits)
{
 
  if(activeView == null)
  {
    return -1;
  }
  //Get the ScreenDisplay
  ESRI.ArcGIS.Display.IScreenDisplay screenDisplay = activeView.ScreenDisplay;

  //Get the DisplayTransformation
  ESRI.ArcGIS.Display.IDisplayTransformation displayTransformation = screenDisplay.DisplayTransformation;

  //Get the device frame which will give us the number of pixels in the X direction
  ESRI.ArcGIS.Display.tagRECT deviceRECT = displayTransformation.get_DeviceFrame();
  System.Int32 pixelExtent = (deviceRECT.right - deviceRECT.left);

  //Get the map extent of the currently visible area
  ESRI.ArcGIS.Geometry.IEnvelope envelope = displayTransformation.VisibleBounds;
  System.Double realWorldDisplayExtent = envelope.Width;

  //Calculate the size of one pixel
  if(pixelExtent == 0)
  {
    return -1;
  }
  System.Double sizeOfOnePixel = (realWorldDisplayExtent / pixelExtent);

  //Multiply this by the input argument to get the result
  return (pixelUnits * sizeOfOnePixel);
}

转载自：ms-help://MS.VSCC.v90/MS.VSIPCC.v90/ESRI.EDNv9.3/Snippets/html/cabbae3d-ccaf-40cb-9bb6-b4fc44fb125e.htm