The 0-based index of the required annotation within the current page. It must be a value from 0 to GdPicturePDF.GetAnnotationCount-1.
Example





In This Topic
GdPicture14 Namespace / GdPicturePDF Class / GetAnnotationOpacity Method

GetAnnotationOpacity Method (GdPicturePDF)

In This Topic
Returns the opacity value of a required annotation object specified by its index related to the currently selected page of the loaded PDF document. This value is used when painting the annotation and it applies to all visible elements of the annotation in its closed state except of the pop-up window.
Syntax
'Declaration

 


Public Function GetAnnotationOpacity( _

   ByVal AnnotationIdx As Integer _

) As Byte
public byte GetAnnotationOpacity( 

   int AnnotationIdx

)
public function GetAnnotationOpacity( 

    AnnotationIdx: Integer

): Byte; 
public function GetAnnotationOpacity( 

   AnnotationIdx : int

) : byte;
public: byte GetAnnotationOpacity( 

   int AnnotationIdx

) 
public:

byte GetAnnotationOpacity( 

   int AnnotationIdx

)

Parameters

AnnotationIdx
The 0-based index of the required annotation within the current page. It must be a value from 0 to GdPicturePDF.GetAnnotationCount-1.

Return Value

The opacity value from 0 (full transparency) to 255 (full opacity) of the specified annotation object. The GdPicturePDF.GetStat method can be subsequently used to determine if this method has been successful.
Remarks
This method is only allowed for use with non-encrypted documents.

It is recommend to use the GdPicturePDF.GetStat method to identify the specific reason for the method's failure, if any.

Please always ensure that you have selected the correct page using the GdPicturePDF.SelectPage method before applying an annotation index.

Example
How to retrieve the opacity and some other properties of all stamp annotation objects within the PDF document. 
Dim caption As String = "Example: GetAnnotationOpacity"

Dim gdpicturePDF As GdPicturePDF = New GdPicturePDF()

Dim status As GdPictureStatus = gdpicturePDF.LoadFromFile("test.pdf", False)

If status = GdPictureStatus.OK Then

    Dim message As String = ""

    Dim pageCount As Integer = gdpicturePDF.GetPageCount()

    For i As Integer = 1 To pageCount

        status = gdpicturePDF.SelectPage(i)

        If status = GdPictureStatus.OK Then

            message = message + "The page nr." + i.ToString()

            Dim annotCount As Integer = gdpicturePDF.GetAnnotationCount()

            status = gdpicturePDF.GetStat()

            If status = GdPictureStatus.OK Then

                If annotCount = 0 Then

                    message = message + " does not contain any annotations."

                Else

                    Dim annotSubType As String = ""

                    Dim color As Color = Color.Black, fillColor As Color = Color.Black

                    Dim opacity As Byte = 0

                    Dim l As Single = 0, t As Single = 0, w As Single = 0, h As Single = 0

                    For j As Integer = 0 To annotCount - 1

                        annotSubType = gdpicturePDF.GetAnnotationSubType(j)

                        If gdpicturePDF.GetStat() = GdPictureStatus.OK Then

                            If annotSubType.Equals("Stamp") Then

                                message = message + vbCrLf + "AnnotID: " + j.ToString()

                                message = message + vbCrLf + "    color: "

                                color = gdpicturePDF.GetAnnotationColor(j)

                                status = gdpicturePDF.GetStat()

                                If status = GdPictureStatus.OK Then message = message + color.ToString() Else message = message + status.ToString()

                                message = message + "    fill color: "

                                fillColor = gdpicturePDF.GetAnnotationFillColor(j)

                                status = gdpicturePDF.GetStat()

                                If status = GdPictureStatus.OK Then message = message + fillColor.ToString() Else message = message + status.ToString()

                                message = message + "    opacity: "

                                opacity = gdpicturePDF.GetAnnotationOpacity(j)

                                status = gdpicturePDF.GetStat()

                                If status = GdPictureStatus.OK Then message = message + opacity.ToString() Else message = message + status.ToString()

                                message = message + "    rectangle: "

                                status = gdpicturePDF.GetAnnotationRect(j, l, t, w, h)

                                If status = GdPictureStatus.OK Then message = message + "[" + l.ToString() + "," + t.ToString() + " ; w:" + w.ToString() + " h:" + h.ToString() + "]" Else message = message + status.ToString()

                            End If

                        Else

                            message = message + vbCrLf + "The GetAnnotationSubType() method has failed with the status: " + status.ToString()

                        End If

                    Next

                End If

            Else

                message = message + ": the GetAnnotationCount() method has failed with the status: " + status.ToString()

            End If

            message = message + vbCrLf

        Else

            message = message + "The SelectPage(" + i.ToString() + ") method has failed with the status: " + status.ToString() + vbCrLf

        End If

    Next

    MessageBox.Show(message, caption)

Else

    MessageBox.Show("The file can't be loaded.", caption)

End If

gdpicturePDF.Dispose()
string caption = "Example: GetAnnotationOpacity";

GdPicturePDF gdpicturePDF = new GdPicturePDF();

GdPictureStatus status = gdpicturePDF.LoadFromFile("test.pdf", false);

if (status == GdPictureStatus.OK)

{

    string message = "";

    int pageCount = gdpicturePDF.GetPageCount();

    for (int i = 1; i <= pageCount; i++)

    {

        status = gdpicturePDF.SelectPage(i);

        if (status == GdPictureStatus.OK)

        {

            message = message + "The page nr." + i.ToString();

            int annotCount = gdpicturePDF.GetAnnotationCount();

            status = gdpicturePDF.GetStat();

            if (status == GdPictureStatus.OK)

            {

                if (annotCount == 0)

                {

                    message = message + " does not contain any annotations.";

                }

                else

                {

                    string annotSubType = "";

                    Color color = Color.Black, fillColor = Color.Black;

                    byte opacity = 0;

                    float l = 0, t = 0, w = 0, h = 0;

                    for (int j = 0; j < annotCount; j++)

                    {

                        annotSubType = gdpicturePDF.GetAnnotationSubType(j);

                        if (gdpicturePDF.GetStat() == GdPictureStatus.OK)

                        {

                            if (annotSubType.Equals("Stamp"))

                            {

                                message = message + "\nAnnotID: " + j.ToString();

            

                                message = message + "\n    color: ";

                                color = gdpicturePDF.GetAnnotationColor(j);

                                status = gdpicturePDF.GetStat();

                                if (status == GdPictureStatus.OK) message = message + color;

                                else message = message + status.ToString();

            

                                message = message + "    fill color: ";

                                fillColor = gdpicturePDF.GetAnnotationFillColor(j);

                                status = gdpicturePDF.GetStat();

                                if (status == GdPictureStatus.OK) message = message + fillColor;

                                else message = message + status.ToString();

            

                                message = message + "    opacity: ";

                                opacity = gdpicturePDF.GetAnnotationOpacity(j);

                                status = gdpicturePDF.GetStat();

                                if (status == GdPictureStatus.OK) message = message + opacity.ToString();

                                else message = message + status.ToString();

            

                                message = message + "    rectangle: ";

                                status = gdpicturePDF.GetAnnotationRect(j, ref l, ref t, ref w, ref h);

                                if (status == GdPictureStatus.OK) message = message + "[" + l.ToString() + "," + t.ToString() + " ; w:" + w.ToString() + " h:" + h.ToString() + "]";

                                else message = message + status.ToString();

                            }

                        }

                        else

                        {

                            message = message + "\nThe GetAnnotationSubType() method has failed with the status: " + status.ToString();

                        }

                    }

                }

            }

            else

                message = message + ": the GetAnnotationCount() method has failed with the status: " + status.ToString();

            

            message = message + "\n";

        }

        else

            message = message + "The SelectPage(" + i.ToString() + ") method has failed with the status: " + status.ToString() + "\n";

    }

    MessageBox.Show(message, caption);

}

else

{

    MessageBox.Show("The file can't be loaded.", caption);

}

gdpicturePDF.Dispose();
Example
How to retrieve the opacity and some other properties of all stamp annotation objects within the PDF document. Dim caption As String = "Example: GetAnnotationOpacity" Dim gdpicturePDF As GdPicturePDF = New GdPicturePDF() Dim status As GdPictureStatus = gdpicturePDF.LoadFromFile("test.pdf", False) If status = GdPictureStatus.OK Then Dim message As String = "" Dim pageCount As Integer = gdpicturePDF.GetPageCount() For i As Integer = 1 To pageCount status = gdpicturePDF.SelectPage(i) If status = GdPictureStatus.OK Then message = message + "The page nr." + i.ToString() Dim annotCount As Integer = gdpicturePDF.GetAnnotationCount() status = gdpicturePDF.GetStat() If status = GdPictureStatus.OK Then If annotCount = 0 Then message = message + " does not contain any annotations." Else Dim annotSubType As String = "" Dim color As Color = Color.Black, fillColor As Color = Color.Black Dim opacity As Byte = 0 Dim l As Single = 0, t As Single = 0, w As Single = 0, h As Single = 0 For j As Integer = 0 To annotCount - 1 annotSubType = gdpicturePDF.GetAnnotationSubType(j) If gdpicturePDF.GetStat() = GdPictureStatus.OK Then If annotSubType.Equals("Stamp") Then message = message + vbCrLf + "AnnotID: " + j.ToString() message = message + vbCrLf + " color: " color = gdpicturePDF.GetAnnotationColor(j) status = gdpicturePDF.GetStat() If status = GdPictureStatus.OK Then message = message + color.ToString() Else message = message + status.ToString() message = message + " fill color: " fillColor = gdpicturePDF.GetAnnotationFillColor(j) status = gdpicturePDF.GetStat() If status = GdPictureStatus.OK Then message = message + fillColor.ToString() Else message = message + status.ToString() message = message + " opacity: " opacity = gdpicturePDF.GetAnnotationOpacity(j) status = gdpicturePDF.GetStat() If status = GdPictureStatus.OK Then message = message + opacity.ToString() Else message = message + status.ToString() message = message + " rectangle: " status = gdpicturePDF.GetAnnotationRect(j, l, t, w, h) If status = GdPictureStatus.OK Then message = message + "[" + l.ToString() + "," + t.ToString() + " ; w:" + w.ToString() + " h:" + h.ToString() + "]" Else message = message + status.ToString() End If Else message = message + vbCrLf + "The GetAnnotationSubType() method has failed with the status: " + status.ToString() End If Next End If Else message = message + ": the GetAnnotationCount() method has failed with the status: " + status.ToString() End If message = message + vbCrLf Else message = message + "The SelectPage(" + i.ToString() + ") method has failed with the status: " + status.ToString() + vbCrLf End If Next MessageBox.Show(message, caption) Else MessageBox.Show("The file can't be loaded.", caption) End If gdpicturePDF.Dispose() string caption = "Example: GetAnnotationOpacity"; GdPicturePDF gdpicturePDF = new GdPicturePDF(); GdPictureStatus status = gdpicturePDF.LoadFromFile("test.pdf", false); if (status == GdPictureStatus.OK) { string message = ""; int pageCount = gdpicturePDF.GetPageCount(); for (int i = 1; i <= pageCount; i++) { status = gdpicturePDF.SelectPage(i); if (status == GdPictureStatus.OK) { message = message + "The page nr." + i.ToString(); int annotCount = gdpicturePDF.GetAnnotationCount(); status = gdpicturePDF.GetStat(); if (status == GdPictureStatus.OK) { if (annotCount == 0) { message = message + " does not contain any annotations."; } else { string annotSubType = ""; Color color = Color.Black, fillColor = Color.Black; byte opacity = 0; float l = 0, t = 0, w = 0, h = 0; for (int j = 0; j < annotCount; j++) { annotSubType = gdpicturePDF.GetAnnotationSubType(j); if (gdpicturePDF.GetStat() == GdPictureStatus.OK) { if (annotSubType.Equals("Stamp")) { message = message + "\nAnnotID: " + j.ToString(); message = message + "\n color: "; color = gdpicturePDF.GetAnnotationColor(j); status = gdpicturePDF.GetStat(); if (status == GdPictureStatus.OK) message = message + color; else message = message + status.ToString(); message = message + " fill color: "; fillColor = gdpicturePDF.GetAnnotationFillColor(j); status = gdpicturePDF.GetStat(); if (status == GdPictureStatus.OK) message = message + fillColor; else message = message + status.ToString(); message = message + " opacity: "; opacity = gdpicturePDF.GetAnnotationOpacity(j); status = gdpicturePDF.GetStat(); if (status == GdPictureStatus.OK) message = message + opacity.ToString(); else message = message + status.ToString(); message = message + " rectangle: "; status = gdpicturePDF.GetAnnotationRect(j, ref l, ref t, ref w, ref h); if (status == GdPictureStatus.OK) message = message + "[" + l.ToString() + "," + t.ToString() + " ; w:" + w.ToString() + " h:" + h.ToString() + "]"; else message = message + status.ToString(); } } else { message = message + "\nThe GetAnnotationSubType() method has failed with the status: " + status.ToString(); } } } } else message = message + ": the GetAnnotationCount() method has failed with the status: " + status.ToString(); message = message + "\n"; } else message = message + "The SelectPage(" + i.ToString() + ") method has failed with the status: " + status.ToString() + "\n"; } MessageBox.Show(message, caption); } else { MessageBox.Show("The file can't be loaded.", caption); } gdpicturePDF.Dispose();
See Also

Reference

GdPicturePDF Class
GdPicturePDF Members
GetAnnotationCount Method
GetStat Method
SelectPage Method
GetStat Method
GetAnnotationCount Method
GetAnnotationSubType Method
SetAnnotationOpacity Method