.net ,output raster image from activeview unexpected acting

alexzeleksonov — Thu, 08 May 2014 08:27:54 GMT

Hello everybody, i am trying to export envelop from the active view with specific coords ,
first i zoom to raster res, and then calc the envelop coord in pixels ,
when i trying to output to bmp image its putting the image in realy bad resalution , i have no idea what i did wrong ?
Here my code snippest,

ZoomToRatster:

 private static void Zoom2Raster(IActiveView pActiveView,IEnvelope i_envelop)
        {
            IPnt RatserCellSize = new Pnt();
            List<string> RasterLayers = VI_ArcGIS.VI_ArcGisLayers.GetImageLayers(pActiveView.FocusMap);
            foreach (string layerName in RasterLayers)
            {
                ILayer CurrentLayer = VI_ArcGIS.VI_ArcGisLayers.GetLayer(pActiveView.FocusMap, layerName);
                if (CurrentLayer is RasterLayer)
                {
                    if (CurrentLayer.Valid && CurrentLayer.Visible)
                    {
                        CurrentLayer = CurrentLayer as RasterLayer;

                        Raster CurrentRaster = (Raster)(CurrentLayer as IRasterLayer).Raster;
                        
                      
                        RatserCellSize = (CurrentRaster as IRasterProps).MeanCellSize();
                       VI_ArcGisLayers.SetLayerVisible(pActiveView.FocusMap, "ROI", false);
                       
                    }
                }
            }
            
            // Calculate current center x and y (Geographic units)
            double Cx = (i_envelop.XMin + i_envelop.XMax) / 2;
            double Cy = (i_envelop.YMin + i_envelop.YMax) / 2;
     
            // Calculate current view width and height in geographic units (meters) = Current view in pixels * resolution
            double Dx = (pActiveView.ExportFrame.right - pActiveView.ExportFrame.left)  * RatserCellSize.X;
            double Dy = (pActiveView.ExportFrame.bottom - pActiveView.ExportFrame.top)  * RatserCellSize.Y;
            IEnvelope extent = (IEnvelope)new Envelope();
            extent.PutCoords(Cx - Dx / 2, Cy + Dy / 2, Cx + Dx / 2, Cy - Dy / 2);
            pActiveView.Extent = extent;
            pActiveView.Refresh();
         
          
        }

where it all begins :

   public static bool CreateContextBMPFromEnvelop(IHookHelper hookHelper, IEnvelope expEnvelope,
            System.String pathFileName)
        {
            IActiveView pActiveView = hookHelper.ActiveView;
            ESRI.ArcGIS.Geometry.IEnvelope ContextEnvelope = expEnvelope;
            int extandEnvelopRate = VI_ArcGIS.Properties.Settings.Default.ExtentEnveleopRate;
            double Max = Math.Max(ContextEnvelope.Width, ContextEnvelope.Height);
            ContextEnvelope.Expand((Max * extandEnvelopRate - ContextEnvelope.Width) / 2, (Max * extandEnvelopRate - ContextEnvelope.Height) / 2, false);
           
            try
            {
                CreateContextBMPFromEnvelopHelper(pActiveView, ContextEnvelope, pathFileName);
            }

            catch (Exception ex)
            {
                log.InfoFormat("runDetectionForm_OnPrepareNextFrame, Exception:{0}", ex.Message);
                return false;
            }

            return true;
        }

helper:

      
 private static void CreateContextBMPFromEnvelopHelper(IActiveView i_CurrentActiveView, IEnvelope i_Envelope, string i_Pathname)
        {
            if (i_CurrentActiveView == null)
            {
                throw new NullReferenceException("Unable Load View");
            }
            
            Zoom2Raster(i_CurrentActiveView, i_Envelope);
            tagRECT ExportRECT = new tagRECT();
            IDisplayTransformation DisplayTranformation = i_CurrentActiveView.ScreenDisplay.DisplayTransformation;

            DisplayTranformation.FromMapPoint(i_Envelope.UpperLeft, out ExportRECT.left, out ExportRECT.top);
            DisplayTranformation.FromMapPoint(i_Envelope.LowerRight, out ExportRECT.right, out ExportRECT.bottom);

            ExportRECT.right = (ExportRECT.right - ExportRECT.left) ;
            ExportRECT.bottom = ( ExportRECT.bottom - ExportRECT.top) ;
            ExportRECT.top = 0;
            ExportRECT.left = 0;

            

            ESRI.ArcGIS.Geometry.IEnvelope envelope = new ESRI.ArcGIS.Geometry.EnvelopeClass();
            envelope.PutCoords(ExportRECT.left, ExportRECT.top,ExportRECT.right,ExportRECT.bottom);
            
            ESRI.ArcGIS.Output.IExport export = new ESRI.ArcGIS.Output.ExportPNGClass();
            export.ExportFileName = i_Pathname;
            export.Resolution = 96;
            export.PixelBounds = envelope;
            System.Int32 hDC = 0;
            
            hDC = export.StartExporting();
            try
            {
             
                i_CurrentActiveView.Output(hDC, (System.Int16)export.Resolution, ref ExportRECT, null, null);
        
            }
            catch (Exception ex)
            {
                throw ex;
            }
      
            export.FinishExporting();
            export.Cleanup();
            


        }

Re: .net ,output raster image from activeview unexpected acting

KenBuja — Thu, 08 May 2014 12:23:07 GMT

You have to set the export quality of the output. Take a look at this page which shows you how to do that.

topic .net ,output raster image from activeview unexpected acting in ArcObjects SDK Questions

.net ,output raster image from activeview unexpected acting

Re: .net ,output raster image from activeview unexpected acting