SetRegionLeft Method (GdViewer)

In This Topic

Sets the horizontal (X) coordinate of the top left point, in inches, where the highlighted region's rectangle is to be located on the displayed document. The highlighted region is specified by its unique identifier related to the document currently displayed in the GdViewer control. These regions, if present, determines the currently defined highlighted regions on the displayed document.

You can define this coordinate of the region's rectangle when adding regions using AddRegion(String,Int32,Int32,Int32,Int32,ForegroundMixMode,Int32) or AddRegionInches(String,Single,Single,Single,Single,ForegroundMixMode,Int32) method. You can determine this coordinate of the region's rectangle using the GetRegionLeft method.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function SetRegionLeft( _
   ByVal RegionID As Integer, _
   ByVal Left As Single _
) As GdPictureStatus

public GdPictureStatus SetRegionLeft( 
   int RegionID,
   float Left
)

public function SetRegionLeft( 
    RegionID: Integer;
    Left: Single
): GdPictureStatus;

public function SetRegionLeft( 
   RegionID : int,
   Left : float
) : GdPictureStatus;

public: GdPictureStatus SetRegionLeft( 
   int RegionID,
   float Left
)

public:
GdPictureStatus SetRegionLeft( 
   int RegionID,
   float Left
)

Parameters

RegionID: A unique region identifier of the specified region. You can obtain this identifier using the GetRegionID method or when creating regions using AddRegion(String,Int32,Int32,Int32,Int32,ForegroundMixMode,Int32) or AddRegionInches(String,Single,Single,Single,Single,ForegroundMixMode,Int32) methods.
Left: The new value for the horizontal coordinate of the top left point, in inches, of the highlighted region's rectangle, related to the actual document.

Return Value

A member of the GdPictureStatus enumeration. If the method has been successfully followed, then the return value is GdPictureStatus.OK. We strongly recommend always checking this status first.

Remarks

Be aware that if the required region does not exist, the method will fail.

Please note that the specified value corresponds to the actual document area, it is not related to the GdViewer control area.

Example

How to enlarge all defined highlighted regions by setting their new positions and new sizes.

VB.NET
C#

'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
        Dim regCount As Integer = GdViewer1.RegionCount(), regID As Integer = 0
        If text_found AndAlso (regCount > 0) Then
            For j As Integer = 1 To regCount
                regID = GdViewer1.GetRegionID(j)
                GdViewer1.SetRegionLeft(regID, GdViewer1.GetRegionLeft(regID) - 0.15F)
                GdViewer1.SetRegionTop(regID, GdViewer1.GetRegionTop(regID) - 0.15F)
                GdViewer1.SetRegionWidth(regID, GdViewer1.GetRegionWidth(regID) + 0.3F)
                GdViewer1.SetRegionHeight(regID, GdViewer1.GetRegionHeight(regID) + 0.3F)
            Next
            GdViewer1.Redraw()
        Else
            MessageBox.Show("The given text has not been found.", "GdViewer.SetRegionLeft")
        End If
    Else
        MessageBox.Show("The search process has failed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRegionLeft")
    End If
Else
    MessageBox.Show("The file can't be displayed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRegionLeft")
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)
    {
        int regCount = GdViewer1.RegionCount(), regID = 0;
        if (text_found && (regCount > 0))
        {
            for (int j = 1; j <= regCount; j++)
            {
                regID = GdViewer1.GetRegionID(j);
                GdViewer1.SetRegionLeft(regID, GdViewer1.GetRegionLeft(regID) - 0.15f);
                GdViewer1.SetRegionTop(regID, GdViewer1.GetRegionTop(regID) - 0.15f);
                GdViewer1.SetRegionWidth(regID, GdViewer1.GetRegionWidth(regID) + 0.3f);
                GdViewer1.SetRegionHeight(regID, GdViewer1.GetRegionHeight(regID) + 0.3f);
            }
            GdViewer1.Redraw();
        }
        else
            MessageBox.Show("The given text has not been found.", "GdViewer.SetRegionLeft");
    }
    else
        MessageBox.Show("The search process has failed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRegionLeft");
}
else
    MessageBox.Show("The file can't be displayed. Status: " + GdViewer1.GetStat().ToString(), "GdViewer.SetRegionLeft");

Reference

GdViewer Class
GdViewer Members
GetRegionLeft Method
RegionCount Method
GetRegionID Method
SearchText(String,Int32,Boolean) Method
AddRegion(String,Int32,Int32,Int32,Int32,ForegroundMixMode,Int32) Method
AddRegionInches(String,Single,Single,Single,Single,ForegroundMixMode,Int32) Method
RemoveAllRegions Method
GetRegionLeftPixels Method
SetRegionLeftPixels Method