Itextsharp processes elements in a group or not.

String filename = DateTime. Now. ToString ("yyyyMMddHHmmss"). ToString () + ". pdf ";
Float w = PageSize. A4.Width;
Float h = PageSize. A4.Height;
Rectangle rect = new Rectangle (0, 0, w, h );
Document document = new Document (rect );
Using writer = Using writer. GetInstance (document, new FileStream (Server. MapPath (filename), FileMode. Create ));

Document. Open ();
Required contentbyte content = writer. DirectContent;
Repeated template = content. CreateTemplate (rect. Width, rect. Height );
PdfGState state = null;
Template. SaveState ();

Template. SetColorFill (Color. RED );
Template. SetColorStroke (Color. GREEN );
Template. SetLineWidth (3 );
State = new PdfGState ();
State. FillOpacity = 0.5f;
State. AlphaIsShape = false;
Template. SetGState (state );
Template. Rectangle (100,100,100,100 );
Template. FillStroke ();
Template. RestoreState ();

Template. SaveState ();
Template. SetColorFill (Color. RED );
Template. SetColorStroke (Color. BLUE );
Template. SetLineWidth (3 );
State = new PdfGState ();
State. FillOpacity = 0.5f;
State. AlphaIsShape = false;
Template. SetGState (state );
Template. Rectangle (150,150,100,100 );
Template. FillStroke ();
Template. RestoreState ();

Template. SaveState ();

// Process the elements in the same group and set the transparency of the Group to 0.5. In this way, when the elements in the group overlap, the image that is drawn later overwrites the image that is first drawn, and no transparency should be set, deepen or affect the colors of overlapping elements
State = new PdfGState ();
State. FillOpacity = 0.5f; // sets the transparency to 0.5.
Template. SetGState (state );
Required template _ template = template. CreateTemplate (rect. Width, rect. Height );

// Set transparent to a group
Transfertransparencygroup group = new transfertransparencygroup ();
Group. Isolated = false; // indicates whether the agent is independent.

_ Template. Group = group;
_ Template. SaveState ();
_ Template. SetColorFill (Color. RED );
_ Template. SetColorStroke (Color. GREEN );
_ Template. SetLineWidth (3 );
_ Template. Rectangle (300,100,100,100 );
_ Template. FillStroke ();
_ Template. RestoreState ();

_ Template. SaveState ();
_ Template. SetColorFill (Color. RED );
_ Template. SetColorStroke (Color. BLUE );
_ Template. SetLineWidth (3 );
_ Template. Rectangle (350,150,100,100 );
_ Template. FillStroke ();
_ Template. RestoreState ();

Template. AddTemplate (_ template, 0, 0 );

Template. RestoreState ();
Content. AddTemplate (template, 1, 0, 0,-1, 0, rect. Height );
Document. Close ();

 

This article is from the explorer blog, please be sure to keep this source http://1906754.blog.51cto.com/1896754/1272926