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1.   An Example of pdf commands sequence and  DJ objects (from 3312-5-4.pdf )

This example is in two parts, one is for drawing, the other is for text. The graph from the drawing commands below is the right most bar in the pdf file, which has a clip path(rectangle). The text below is the name for the left bar chart, "G184AS".


Drawing:

Commands   Description
q
 Push current Graphics(G0) State to Stack
533.182 605.288 6.377 -10.536 re Clip path
W*
n
 End of Clip path
1 1 1 1 K Begin to draw some paths with new Graphics State (G1)
0 J
1.002 w
537.154 606.677 m
530.997 596.014 l
541.493 604.172 m
535.337 593.508 l
527.95 602.266 m
534.107 591.603 l
532.29 604.772 m
538.447 594.108 l
536.63 607.277 m
542.786 596.614 l
S
 Stroke paths with Graphics State (G1: 1111 k, 0 J, 1.0002 w)
Q
 Pop the top Graphics State(G0)  from Stack
533.182 605.288 6.377 -10.536 re Draw rectangle, which is the same as the clip path
S Stroke this rectangle with Graphics State (G0) as the boundary


The DJ objects we get above are 5 DPath objects and 1 DRectangle object.

DPath Objects
 Begin Point
 End Point
 Operation
 Color
 Width
 Horizontal
 Vertical
1st DPath
 537.154 606.677 530.997 596.014 Stroke
 Black
 1.002
 false
 false
2nd DPath
 541.493 604.172 535.337 593.508 Stroke
 Black
 1.002
 false
 false
3rd DPath
 527.95 602.266 534.107 591.603 Stroke
 Black
 1.002
 false
 false
4th DPath
 532.29 604.772 538.447 594.108 Stroke
 Black
 1.002
 false
 false
5th DPath
 536.63 607.277 542.786 596.614 Stroke
 Black
 1.002
 false
 false

                             
DRectangle Object
 Origin Point (left upper)
 Width
 Height Operation
 Graphics States
1st DRectangle
 533.182,  605.288 6.377 10.536 Stroke G0




Text:

Commands
 Description
0 7.763 -7.763 1.65 367.045 521.684 Tm ext Matrix, rotate text following to be vertical 
(G184AS) Tj  Text shown


The DJ object is a DText object:  

DText Object
 Text
 Matrix
 Origin Point
 Length
 Direction
DText
 "G184AS" 0 7.763 -7.763 1.65 367.045 521.684 367.045, 521.684 LENGTH_CHARACTER * character number of "G184AS" vertical




2.    Statistics

Diagram:  3312-5-4.pdf
Statistics:     Number of DPath objects: 660,     Number of DRectangle objs:  15,     Number of DText objects:  48
The code counting the numbers is DiagramCounter.java .


3.  A diagram can be slice-diced

Diagram: 1183-9-5.pdf

There are three data files created from slice-dice code, named  1183-9-5-diagram-0.dat, 1183-9-5-diagram-1.dat, and 1183-9-5-diagram-2.dat respectively, at /proj/bkl/myshao/download/pdf/result/slice-dice-data-files/. But I can't make sure that the three data files are the three parts to be slice-dices, though this file looks easy to be slice-diced easily and reasonablely.





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