GdPicture.NET Reference Guide
SetRectCoordinatesOnViewerPixel Method
Example 





GdPicture14.WPF Namespace > GdViewer Class : SetRectCoordinatesOnViewerPixel Method
The horizontal (X) coordinate (0-based) of the top left point, in pixels, of the rectangle of selection, related to the viewer area.
The vertical (Y) coordinate (0-based) of the top left point, in pixels, of the rectangle of selection, related to the viewer area.
The width, in pixels, of the rectangle of selection.
The height, in pixels, of the rectangle of selection.
Determines the rectangle of area selection refering to the displayed viewer area. This method sets the specified coordinates and dimensions, in pixels, to identify the rectangle of selection related to the document displayed in the GdViewer control. The specified rectangle is immediately drawn on the viewer area using the predefined parameters. Please ensure, that all given values correspond to the viewer area.

Be aware that the rectangle of selection always relates to the displayed document. On the other hand, you can specify the border size of this rectangle using the RectBorderSize property and the border color of this rectangle using the RectBorderColor property to be applied permanently.

Syntax
'Declaration
 
Public Sub SetRectCoordinatesOnViewerPixel( _
   ByVal Left As Double, _
   ByVal Top As Double, _
   ByVal Width As Double, _
   ByVal Height As Double _
) 
public void SetRectCoordinatesOnViewerPixel( 
   double Left,
   double Top,
   double Width,
   double Height
)
public procedure SetRectCoordinatesOnViewerPixel( 
    Left: Double;
    Top: Double;
    Width: Double;
    Height: Double
); 
public function SetRectCoordinatesOnViewerPixel( 
   Left : double,
   Top : double,
   Width : double,
   Height : double
);
public: void SetRectCoordinatesOnViewerPixel( 
   double Left,
   double Top,
   double Width,
   double Height
) 
public:
void SetRectCoordinatesOnViewerPixel( 
   double Left,
   double Top,
   double Width,
   double Height
) 

Parameters

Left
The horizontal (X) coordinate (0-based) of the top left point, in pixels, of the rectangle of selection, related to the viewer area.
Top
The vertical (Y) coordinate (0-based) of the top left point, in pixels, of the rectangle of selection, related to the viewer area.
Width
The width, in pixels, of the rectangle of selection.
Height
The height, in pixels, of the rectangle of selection.
Remarks
Be aware that you are allowed to define only one rectangle of selection within the current viewer. Likewise, the rectangle of selection always relates to the currently displayed document, meaning that without displaying some document you cannot specify the new rectangle of selection.

Just to remind you, that all coordinates are 0-based with the origin being in the top left corner in the viewer area.

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 Double = 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.SetRectCoordinatesOnViewerPixel")
        End If
    Else
        MessageBox.Show("The search process has failed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRectCoordinatesOnViewerPixel")
    End If
Else
    MessageBox.Show("The file can't be displayed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRectCoordinatesOnViewerPixel")
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.SetRectCoordinatesOnViewerPixel");
    }
    else
        MessageBox.Show("The search process has failed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRectCoordinatesOnViewerPixel");
}
else
    MessageBox.Show("The file can't be displayed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRectCoordinatesOnViewerPixel");
See Also

Reference

GdViewer Class
GdViewer Members
GetRectCoordinatesOnViewerPixel Method
SetRectCoordinatesOnDocumentPixel Method
SetRectCoordinatesOnDocumentInch Method
RectBorderColor Property
RectBorderSize Property
IsRect Method
ClearRect Method