C# EnvelopeClass.QueryCoords方法代码示例

    /// <summary>
    /// Map tip text at the specified mouse location.
    /// </summary>
    /// <param name="X"></param>
    /// <param name="Y"></param>
    /// <param name="Tolerance"></param>
    /// <returns></returns>
    public override string get_TipText(double X, double Y, double Tolerance)
    {
      IEnvelope envelope = new EnvelopeClass();
      envelope.PutCoords(X - Tolerance, Y - Tolerance,X + Tolerance, Y + Tolerance);
      
      //reproject the envelope to the datasource doordinate system
			if (null != m_mapSpatialRef && m_mapSpatialRef.FactoryCode != m_layerSRFactoryCode)
      {
        envelope.SpatialReference = m_spatialRef;
        envelope.Project(m_mapSpatialRef);
      }

      double xmin, ymin, xmax, ymax;
      envelope.QueryCoords(out xmin, out ymin, out xmax, out ymax);  
      
      //select all the records within the given extent
      string qry = "LON >= " + xmin.ToString() + " AND LON <= " + xmax.ToString() + " AND Lat >= " + ymin.ToString() + " AND LAT <= " + ymax.ToString();
      DataRow[] rows = m_table.Select(qry);
      if(0 == rows.Length)
        return string.Empty;

      DataRow r = rows[0];
      string zipCode = Convert.ToString(r[1]);
      string cityName = Convert.ToString(r[2]);
      string temperature = Convert.ToString(r[5]);

      return cityName + ", " + zipCode + ", " + temperature + "F";
    }

        private void document_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            //this code will be called when the PrintPreviewDialog.Show method is called
            //set the PageToPrinterMapping property of the Page. This specifies how the page
            //is mapped onto the printer page. By default the page will be tiled
            //get the selected mapping option
            string sPageToPrinterMapping = (string)this.comboBox1.SelectedItem;
            if (sPageToPrinterMapping == null)
                //if no selection has been made the default is tiling
                axPageLayoutControl1.Page.PageToPrinterMapping = esriPageToPrinterMapping.esriPageMappingTile;
            else if (sPageToPrinterMapping.Equals("esriPageMappingTile"))
                axPageLayoutControl1.Page.PageToPrinterMapping = esriPageToPrinterMapping.esriPageMappingTile;
            else if (sPageToPrinterMapping.Equals("esriPageMappingCrop"))
                axPageLayoutControl1.Page.PageToPrinterMapping = esriPageToPrinterMapping.esriPageMappingCrop;
            else if (sPageToPrinterMapping.Equals("esriPageMappingScale"))
                axPageLayoutControl1.Page.PageToPrinterMapping = esriPageToPrinterMapping.esriPageMappingScale;
            else
                axPageLayoutControl1.Page.PageToPrinterMapping = esriPageToPrinterMapping.esriPageMappingTile;

            //get the resolution of the graphics device used by the print preview (including the graphics device)
            short dpi = (short)e.Graphics.DpiX;
            //envelope for the device boundaries
            IEnvelope devBounds = new EnvelopeClass();
            //get page
            IPage page = axPageLayoutControl1.Page;

            //the number of printer pages the page will be printed on
            short printPageCount;
            printPageCount = axPageLayoutControl1.get_PrinterPageCount(0);
            m_CurrentPrintPage++;

            //the currently selected printer
            IPrinter printer = axPageLayoutControl1.Printer;
            //get the device bounds of the currently selected printer
            page.GetDeviceBounds(printer, m_CurrentPrintPage, 0, dpi, devBounds);

            //structure for the device boundaries
            tagRECT deviceRect;
            //Returns the coordinates of lower, left and upper, right corners
            double xmin, ymin, xmax, ymax;
            devBounds.QueryCoords(out xmin, out ymin, out xmax, out ymax);
            //initialize the structure for the device boundaries
            deviceRect.bottom = (int)ymax;
            deviceRect.left = (int)xmin;
            deviceRect.top = (int)ymin;
            deviceRect.right = (int)xmax;

            //determine the visible bounds of the currently printed page
            IEnvelope visBounds = new EnvelopeClass();
            page.GetPageBounds(printer, m_CurrentPrintPage, 0, visBounds);

            //get a handle to the graphics device that the print preview will be drawn to
            IntPtr hdc = e.Graphics.GetHdc();

            //print the page to the graphics device using the specified boundaries
            axPageLayoutControl1.ActiveView.Output(hdc.ToInt32(), dpi, ref deviceRect, visBounds, m_TrackCancel);

            //release the graphics device handle
            e.Graphics.ReleaseHdc(hdc);

            //check if further pages have to be printed
            if (m_CurrentPrintPage < printPageCount)
                e.HasMorePages = true; //document_PrintPage event will be called again
            else
                e.HasMorePages = false;
        }