GdPicture.NET Reference Guide
CoordDocumentPixelToViewerPixel Method
Example 





GdPicture14.WPF Namespace > GdViewer Class : CoordDocumentPixelToViewerPixel Method
The horizontal (X) coordinate, in pixels, of the point located inside the document area.
The vertical (Y) coordinate, in pixels, of the point located inside the document area.
Output parameter.The horizontal (X) coordinate, in pixels, of the corresponding point located inside the viewer area.
Output parameter.The vertical (Y) coordinate, in pixels, of the corresponding point located inside the viewer area.
Translates the coordinates of the point located in the document area of the document currently displayed in the GdViewer control (the document space), in pixels, to the coordinates of the corresponding point located in the GdViewer control area (the viewer space), in pixels. That said, the point with the coordinates (DocumentLeft, DocumentTop) inside the currently displayed page of the document matches to the point with coordinates (ViewerLeft, ViewerTop) inside the GdViewer control area.
Syntax
'Declaration
 
Public Sub CoordDocumentPixelToViewerPixel( _
   ByVal DocumentLeft As Double, _
   ByVal DocumentTop As Double, _
   ByRef ViewerLeft As Double, _
   ByRef ViewerTop As Double _
) 
public void CoordDocumentPixelToViewerPixel( 
   double DocumentLeft,
   double DocumentTop,
   ref double ViewerLeft,
   ref double ViewerTop
)
public procedure CoordDocumentPixelToViewerPixel( 
    DocumentLeft: Double;
    DocumentTop: Double;
   var  ViewerLeft: Double;
   var  ViewerTop: Double
); 
public function CoordDocumentPixelToViewerPixel( 
   DocumentLeft : double,
   DocumentTop : double,
   ViewerLeft : double,
   ViewerTop : double
);
public: void CoordDocumentPixelToViewerPixel( 
   double DocumentLeft,
   double DocumentTop,
   ref double ViewerLeft,
   ref double ViewerTop
) 
public:
void CoordDocumentPixelToViewerPixel( 
   double DocumentLeft,
   double DocumentTop,
   double% ViewerLeft,
   double% ViewerTop
) 

Parameters

DocumentLeft
The horizontal (X) coordinate, in pixels, of the point located inside the document area.
DocumentTop
The vertical (Y) coordinate, in pixels, of the point located inside the document area.
ViewerLeft
Output parameter.The horizontal (X) coordinate, in pixels, of the corresponding point located inside the viewer area.
ViewerTop
Output parameter.The vertical (Y) coordinate, in pixels, of the corresponding point located inside the viewer area.
Remarks
Just to inform you, that all coordinates are 0-based with the origin being in the top left corner and they are related to the current page determined by the CurrentPage property.
Example
How to draw a rectangle of selection around the text found.
'We assume that the GdViewer1 control has been properly integrated.
If GdViewer1.DisplayFromFile("") = GdPictureStatus.OK Then
    Dim text_to_find As String = "GdPicture"
    GdViewer1.RemoveAllRegions()
    Dim text_found As Boolean = GdViewer1.SearchText(text_to_find, 0, True)
    If GdViewer1.GetStat() = GdPictureStatus.OK Then
        If text_found Then
            'The first region surely exists.
            Dim regID As Integer = GdViewer1.GetRegionID(1)
            GdViewer1.DisplayPage(GdViewer1.GetRegionPage(regID))
            Dim DocumentLeft As Double = GdViewer1.GetRegionLeftPixels(regID)
            Dim DocumentTop As Double = GdViewer1.GetRegionTopPixels(regID)
            Dim ViewerLeft As Double = 0, ViewerTop As Integer = 0
            GdViewer1.CoordDocumentPixelToViewerPixel(DocumentLeft, DocumentTop, ViewerLeft, ViewerTop)
            Dim ViewerWidth As Double = GdViewer1.GetRegionWidthPixels(regID)
            Dim ViewerHeight As Double = GdViewer1.GetRegionHeightPixels(regID)
            GdViewer1.SetRectCoordinatesOnViewerPixel(ViewerLeft, ViewerTop, ViewerWidth, ViewerHeight)
        Else
            MessageBox.Show("The given text has not been found.", "GdViewer.CoordDocumentPixelToViewerPixel")
        End If
    Else
        MessageBox.Show("The search process has failed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CoordDocumentPixelToViewerPixel")
    End If
Else
    MessageBox.Show("The file can't be displayed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CoordDocumentPixelToViewerPixel")
End If
//We assume that the GdViewer1 control has been properly integrated.
if (GdViewer1.DisplayFromFile("") == GdPictureStatus.OK)
{
    string text_to_find = "GdPicture";
    GdViewer1.RemoveAllRegions();
    bool text_found = GdViewer1.SearchText(text_to_find, 0, true);
    if (GdViewer1.GetStat() == GdPictureStatus.OK)
    {
        if (text_found)
        {
            //The first region surely exists.
            int regID = GdViewer1.GetRegionID(1);
            GdViewer1.DisplayPage(GdViewer1.GetRegionPage(regID));
            double DocumentLeft = GdViewer1.GetRegionLeftPixels(regID);
            double DocumentTop = GdViewer1.GetRegionTopPixels(regID);
            double ViewerLeft = 0, ViewerTop = 0;
            GdViewer1.CoordDocumentPixelToViewerPixel(DocumentLeft, DocumentTop, ref ViewerLeft, ref ViewerTop);
            double ViewerWidth = GdViewer1.GetRegionWidthPixels(regID);
            double ViewerHeight = GdViewer1.GetRegionHeightPixels(regID);
            GdViewer1.SetRectCoordinatesOnViewerPixel(ViewerLeft, ViewerTop, ViewerWidth, ViewerHeight);
        }
        else
            MessageBox.Show("The given text has not been found.", "GdViewer.CoordDocumentPixelToViewerPixel");
    }
    else
        MessageBox.Show("The search process has failed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CoordDocumentPixelToViewerPixel");
}
else
    MessageBox.Show("The file can't be displayed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CoordDocumentPixelToViewerPixel");
See Also

Reference

GdViewer Class
GdViewer Members
CoordDocumentInchToViewerPixel Method
PageHorizontalResolution Property
PageVerticalResolution Property