protected override void OnMouseDown(ESRI.ArcGIS.Desktop.AddIns.Tool.MouseEventArgs arg)
{
int intx = arg.X;
int inty = arg.Y;
IPoint pPoints = new PointClass();
pPoints.PutCoords(intx, inty);
IActiveView activeView = ArcMap.Document.ActiveView;
pPoints = activeView.ScreenDisplay.DisplayTransformation.ToMapPoint(-100, 40);//x,y为屏幕坐标
ESRI.ArcGIS.Display.IScreenDisplay screenDisplay = activeView.ScreenDisplay;
ESRI.ArcGIS.Display.IDisplayTransformation displayTransformation = screenDisplay.DisplayTransformation;
pPoints = displayTransformation.ToMapPoint(-120, 40);
IMxDocument doc = ArcMap.Document;
IMap map = doc.FocusMap;
pPoints = doc.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(-100, 40);
AlterForm frm = null;
if (frm == null || frm.IsDisposed)
{
frm = new AlterForm(intx, inty);
}
frm.Show();
frm.TopMost = true;
frm.Width = 400;
frm.Height = 300;
frm.Left = 500;
}
/// <summary>
/// Gets the number of map units for a given number of pixels
/// </summary>
/// <param name="pixelUnits">number of pixels to convert</param>
/// <returns>double</returns>
/// <remarks>Converted from http://resources.esri.com/help/9.3/ArcGISDesktop/com/samples/Cartography/Display/dc78c617-adbb-4145-bc9a-530230905f80.htm</remarks>
public double ConvertPixelsToMapUnits(double pixelUnits)
{
double realWorldDisplayExtent = 0;
long pixelExtent = 0;
double sizeOfOnePixel = 0;
ESRI.ArcGIS.Display.IDisplayTransformation pDT = null;
tagRECT deviceRECT;
ESRI.ArcGIS.Geometry.IEnvelope pEnv = null;
ESRI.ArcGIS.Carto.IActiveView pActiveView = null;
// Get the width of the display extents in Pixels
// and get the extent of the displayed data
// work out the size of one pixel and then return
// the pixels units passed in mulitplied by that value
pActiveView = this.ActiveView;
// Get IDisplayTransformation
pDT = pActiveView.ScreenDisplay.DisplayTransformation;
// Get the device frame which will give us the number of pixels in the X direction
deviceRECT = pDT.get_DeviceFrame();
pixelExtent = deviceRECT.right - deviceRECT.left;
// Now get the map extent of the currently visible area
pEnv = pDT.VisibleBounds;
// Calculate the size of one pixel
realWorldDisplayExtent = pEnv.Width;
sizeOfOnePixel = realWorldDisplayExtent / pixelExtent;
//Multiply this by the input argument to get the result
return(pixelUnits * sizeOfOnePixel);
}
