To traverse the list of changes in the graphics state.
C# C++ Go Java JavaScript Obj-C PHP Python Ruby VB
1 GSChangesIterator gs_itr = reader. GetChangesIterator ();
2 for ( ; gs_itr. HasNext (); gs_itr. Next ())
3 {
4 switch (gs_itr. Current ())
5 {
6 case GState.GStateAttribute.e_transform :
7 // Get transform matrix for this element. Unlike path.GetCTM()
8 // that return full transformation matrix gs.GetTransform() return
9 // only the transformation matrix that was installed for this element.
10 //
11 // gs.GetTransform();
12 break ;
13 case GState.GStateAttribute.e_line_width :
14 // gs.GetLineWidth();
15 break ;
16 case GState.GStateAttribute.e_line_cap :
17 // gs.GetLineCap();
18 break ;
19 case GState.GStateAttribute.e_line_join :
20 // gs.GetLineJoin();
21 break ;
22 case GState.GStateAttribute.e_miter_limit :
23 // gs.GetMiterLimit();
24 break ;
25 case GState.GStateAttribute.e_dash_pattern :
26 {
27 // double[] dashes;
28 // gs.GetDashes(dashes);
29 // gs.GetPhase()
30 break ;
31 }
32 // Etc.
33 }
34 }
1 GSChangesIterator gs_itr = reader. GetChangesIterator ();
2 for (; gs_itr. HasNext (); gs_itr. Next ())
3 {
4 switch (gs_itr. Current ())
5 {
6 case GState :: e_transform :
7 // Get transform matrix for this element. Unlike path.GetCTM()
8 // that return full transformation matrix gs.GetTransform() return
9 // only the transformation matrix that was installed for this element.
10 //
11 // gs.GetTransform();
12 break ;
13 case GState :: e_line_width :
14 // gs.GetLineWidth();
15 break ;
16 case GState :: e_line_cap :
17 // gs.GetLineCap();
18 break ;
19 case GState :: e_line_join :
20 // gs.GetLineJoin();
21 break ;
22 case GState :: e_miter_limit :
23 // gs.GetMiterLimit();
24 break ;
25 case GState :: e_dash_pattern :
26 {
27 // std::vector<double> dashes;
28 // gs.GetDashes(dashes);
29 // gs.GetPhase()
30 }
31 break ;
32 }
33 }
1 gsItr := reader. GetChangesIterator ()
2 for gsItr. HasNext (){
3 if int (gsItr. Current ()) == int (GStateE_transform){
4 // Get transform matrix for this element. Unlike path.GetCTM()
5 // that return full transformation matrix gs.GetTransform() return
6 // only the transformation matrix that was installed for this element.
7 //
8 // gs.GetTransform()
9
10 } else if int (gsItr. Current ()) == int (GStateE_line_width){
11 // gs.GetLineWidth()
12
13 } else if int (gsItr. Current ()) == int (GStateE_line_cap){
14 // gs.GetLineCap()
15
16 } else if int (gsItr. Current ()) == int (GStateE_line_join){
17 // gs.GetLineJoin()
18
19 } else if int (gsItr. Current ()) == int (GStateE_flatness){
20
21 } else if int (gsItr. Current ()) == int (GStateE_miter_limit){
22 // gs.GetMiterLimit()
23
24 } else if int (gsItr. Current ()) == int (GStateE_dash_pattern){
25 // dashes = gs.GetDashes()
26 // gs.GetPhase()
27
28 }
29 gsItr. Next ()
30 }
1 GSChangesIterator gs_itr = reader. getChangesIterator ();
2 while (gs_itr. hasNext ()) {
3 switch (gs_itr. next (). intValue ()) {
4 case GState.e_transform :
5 // Get transform matrix for this element. Unlike path.GetCTM()
6 // that return full transformation matrix gs.GetTransform() return
7 // only the transformation matrix that was installed for this element.
8 //
9 //gs.getTransform();
10 break ;
11 case GState.e_line_width :
12 //gs.getLineWidth();
13 break ;
14 case GState.e_line_cap :
15 //gs.getLineCap();
16 break ;
17 case GState.e_line_join :
18 //gs.getLineJoin();
19 break ;
20 case GState.e_miter_limit :
21 //gs.getMiterLimit();
22 break ;
23 case GState.e_dash_pattern : {
24 //double[] dashes;
25 //dashes=gs.getDashes();
26 //gs.getPhase();
27 }
28 break ;
29 }
30 }
1 async function main () {
2 const reader = await PDFNet.ElementReader. create ();
3 const gs_itr = await reader. getChangesIterator ();
4 for ( ; gs_itr. hasNext (); gs_itr. next ())
5 {
6 switch (gs_itr. current ())
7 {
8 case GState.Attribute.e_transform :
9 // Get transform matrix for this element. Unlike path.GetCTM()
10 // that return full transformation matrix gs.GetTransform() return
11 // only the transformation matrix that was installed for this element.
12 //
13 // await gs.getTransform();
14 break ;
15 case GState.Attribute.e_line_width :
16 // await gs.getLineWidth();
17 break ;
18 case GState.Attribute.e_line_cap :
19 // await gs.getLineCap();
20 break ;
21 case GState.Attribute.e_line_join :
22 // await gs.getLineJoin();
23 break ;
24 case GState.Attribute.e_miter_limit :
25 // await gs.getMiterLimit();
26 break ;
27 case GState.Attribute.e_dash_pattern :
28 {
29 // await gs.GetDashPattern();
30 // await gs.GetPhase();
31 break ;
32 }
33 // Etc.
34 }
35 }
36 }
37 PDFNet. runWithCleanup (main);
1 PTGSChangesIterator * gs_itr = [reader GetChangesIterator ];
2 for (; [gs_itr HasNext ]; [gs_itr Next ])
3 {
4 switch ([gs_itr Current ])
5 {
6 case e_pttransform :
7 // Get transform matrix for this element. Unlike path.GetCTM()
8 // that return full transformation matrix gs.GetTransform() return
9 // only the transformation matrix that was installed for this element.
10 //
11 // gs.GetTransform();
12 break ;
13 case e_ptline_width :
14 // gs.GetLineWidth();
15 break ;
16 case e_ptline_cap :
17 // gs.GetLineCap();
18 break ;
19 case e_ptline_join :
20 // gs.GetLineJoin();
21 break ;
22 case e_ptmiter_limit :
23 // gs.GetMiterLimit();
24 break ;
25 case e_ptdash_pattern :
26 {
27 // std::vector<double> dashes;
28 // gs.GetDashes(dashes);
29 // gs.GetPhase()
30 }
31 break ;
32 default :
33 break ;
34 }
35 }
1 $gs_itr = $reader -> GetChangesIterator ();
2 for (; $gs_itr -> HasNext (); $gs_itr -> Next ())
3 {
4 switch ($gs_itr -> Current ())
5 {
6 case GState :: e_transform :
7 // Get transform matrix for this element. Unlike path.GetCTM()
8 // that return full transformation matrix gs.GetTransform() return
9 // only the transformation matrix that was installed for this element.
10 //
11 // $gs->GetTransform();
12 break ;
13 case GState :: e_line_width :
14 // $gs->GetLineWidth();
15 break ;
16 case GState :: e_line_cap :
17 // $gs->GetLineCap();
18 break ;
19 case GState :: e_line_join :
20 // $gs->GetLineJoin();
21 break ;
22 case GState :: e_miter_limit :
23 // $gs->GetMiterLimit();
24 break ;
25 case GState :: e_dash_pattern :
26 {
27 // $dashes = $gs->GetDashes($dashes);
28 // $gs->GetPhase()
29 }
30 break ;
31 }
32 }
1 gs_itr = reader.GetChangesIterator()
2 while gs_itr.HasNext():
3 if gs_itr.Current() == GState.e_transform:
4 # Get transform matrix for this element. Unlike path.GetCTM()
5 # that return full transformation matrix gs.GetTransform() return
6 # only the transformation matrix that was installed for this element.
7 #
8 # gs.GetTransform()
9 pass
10 elif gs_itr.Current() == GState.e_line_width:
11 # gs.GetLineWidth()
12 pass
13 elif gs_itr.Current() == GState.e_line_cap:
14 # gs.GetLineCap()
15 pass
16 elif gs_itr.Current() == GState.e_line_join:
17 # gs.GetLineJoin()
18 pass
19 elif gs_itr.Current() == GState.e_miter_limit:
20 # gs.GetMiterLimit()
21 pass
22 elif gs_itr.Current() == GState.e_dash_pattern:
23 # dashes = gs.GetDashes()
24 # gs.GetPhase()
25 pass
26 gs_itr.Next()
1 gs_itr = reader. GetChangesIterator
2 while gs_itr. HasNext do
3 case gs_itr. Current
4 when GState :: E_transform
5 # Get transform matrix for this element. Unlike path.GetCTM
6 # that return full transformation matrix gs.GetTransform return
7 # only the transformation matrix that was installed for this element.
8 #
9 # gs.GetTransform
10 when GState :: E_line_width
11 # gs.GetLineWidth
12 when GState :: E_line_cap
13 # gs.GetLineCap
14 when GState :: E_line_join
15 # gs.GetLineJoin
16 when GState :: E_miter_limit
17 # gs.GetMiterLimit
18 when GState :: E_dash_pattern
19 # dashes = gs.GetDashes
20 # gs.GetPhase
21 end
22 gs_itr. Next
23 end
1 Dim gs_itr As GSChangesIterator = reader. GetChangesIterator ()
2 While gs_itr. HasNext ()
3 If gs_itr. Current () = GState.GStateAttribute.e_transform Then
4 ' Get transform matrix for this element. Unlike path.GetCTM()
5 ' that return full transformation matrix gs.GetTransform() return
6 ' only the transformation matrix that was installed for this element.
7 '
8 ' gs.GetTransform()
9 ElseIf gs_itr. Current () = GState.GStateAttribute.e_line_width Then
10 ' gs.GetLineWidth()
11 ElseIf gs_itr. Current () = GState.GStateAttribute.e_line_cap Then
12 ' gs.GetLineCap()
13 ElseIf gs_itr. Current () = GState.GStateAttribute.e_line_join Then
14 ' gs.GetLineJoin()
15 ElseIf gs_itr. Current () = GState.GStateAttribute.e_miter_limit Then
16 ' gs.GetMiterLimit()
17 ElseIf gs_itr. Current () = GState.GStateAttribute.e_dash_pattern Then
18 ' Dim dashes As Double()
19 ' gs.GetDashes(dashes)
20 ' gs.GetPhase()
21 End If
22 gs_itr. Next ()
23 End While
PDF Data Extraction (Images, Text, Paths) - Full Sample download and get started with Server SDK .
After reading an Element using ElementReader.Next(), it is possible to access all graphical attributes of the Element through its graphics state. Some applications are more interested in changes in the graphics state than attribute values. For example, a transition from one Element to another may not involve changes in the graphics state. Or, perhaps, there may be changes only to a couple of attributes. In these cases, it isn't efficient to make memberwise comparisons between the old and current graphics states.
To make this easier and more efficient, Apryse SDK offers an API to enumerate the list of changes between subsequent Elements.
It's also possible to query ElementReader for changes to a specific attribute:
C# C++ Go Java JavaScript Obj-C PHP Python Ruby VB
1 if (reader. IsChanged (GState.GStateAttribute.e_line_width))
2 {
3 // line width was changed.
4 }
1 if reader. IsChanged (GStateE_line_width)
2 {
3 // line width was changed.
4 }
1 if (reader. IsChanged (GState::e_line_width))
2 {
3 // line width was changed.
4 }
1 if (reader. isChanged (GState.e_line_width))
2 {
3 // line width was changed.
4 }
1 if (reader. isChanged (GState.Attribute.e_line_width))
2 {
3 // line width was changed.
4 }
1 if ([reader IsChanged :e_ptline_width])
2 {
3 // line width was changed.
4 }
1 if ( reader -> IsChanged ( GState :: e_line_width ))
2 {
3 // line width was changed.
4 }
1 if reader.IsChanged(GState::e_line_width):
2 # line width was changed.
1 if (reader. IsChanged ( GState :: E_line_width ))
2 # line width was changed.
3 end
1 If reader. IsChanged (GState.GStateAttribute.e_line_width) Then
2 ' line width was changed.
3 End If
Note that the list of modified attributes is accumulated when calling ElementReader.Next(). To clear the list of modified attributes use ElementReader.ClearChangeList() method. A call to ClearChangeList() serves as a marker in the display list from which further changes in the graphics state are tracked.