Reference Guide
GdPicture14.WPF Namespace / GdViewer Class / CenterOnRect Method
Example





In This Topic
    CenterOnRect Method (GdViewer)
    In This Topic
    Moves the current page of the document displayed in the GdViewer control within the viewer to set the rectangle of area selection, if any is defined, in the middle of the viewer. You can use the IsRect method to find out, if the rectangle of selection is currently specified.
    Syntax
    'Declaration
     
    
    Public Sub CenterOnRect() 
    public void CenterOnRect()
    public procedure CenterOnRect(); 
    public function CenterOnRect();
    public: void CenterOnRect(); 
    public:
    void CenterOnRect(); 
    Remarks
    You can regularly apply the GetStat method to determine if this method has been successful.

    Just to inform you, that both the horizontal and the vertical scrollbars are set to new positions, if required.

    Likewise to remind you, that the current page is determined by the CurrentPage property.

    Example
    How to make the newly defined rectangle of selection visible in the viewer.
    'We assume that the GdViewer1 control has been properly integrated
    'and your document has been properly displayed as well.
    If GdViewer1.SelectAllText() = GdPictureStatus.OK Then
        If GdViewer1.IsRect() Then GdViewer1.ClearRect()
        Dim regions As Rect() = GdViewer1.GetSelectedTextRegions()
        If (GdViewer1.GetStat() = GdPictureStatus.OK) AndAlso (regions.Length > 0) Then
            Dim rect As Rect = regions(0)
            GdViewer1.SetRectCoordinatesOnDocumentInch(rect.Left, rect.Top, rect.Width, rect.Height)
            GdViewer1.CenterOnRect()
        Else
            MessageBox.Show("The text region can't be found. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CenterOnRect")
        End If
    Else
        MessageBox.Show("The text can't be selected. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CenterOnRect")
    End If
    //We assume that the GdViewer1 control has been properly integrated
    //and your document has been properly displayed as well.
    if (GdViewer1.SelectAllText() == GdPictureStatus.OK)
    {
        if (GdViewer1.IsRect()) GdViewer1.ClearRect();
        Rect[] regions = GdViewer1.GetSelectedTextRegions();
        if ((GdViewer1.GetStat() == GdPictureStatus.OK) && (regions.Length > 0))
        {
            //The first region surely exists.
            Rect rect = regions[0];
            GdViewer1.SetRectCoordinatesOnDocumentInch(rect.Left, rect.Top, rect.Width, rect.Height);
            GdViewer1.CenterOnRect();
        }
        else
            MessageBox.Show("The text region can't be found. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CenterOnRect");
    }
    else
        MessageBox.Show("The text can't be selected. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.CenterOnRect");
    See Also