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Subject: [OASIS Issue Tracker] Updated: (OFFICE-3710) 19.145draw:enhanced-path current point definition unclear.



     [ http://tools.oasis-open.org/issues/browse/OFFICE-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Weir  updated OFFICE-3710:
---------------------------------

          Component/s: Graphics
    Affects Version/s: ODF 1.2 COS 1
                           (was: ODF 1.2)
          Description: 
In the definition for draw:enhanced-path the current point definition seemsto be                                                                                                            
unclear. What is the current Point for first subpath in an enhanced path shape?                                                                                                               
It is important to know for commands like A or W.                                                                                                                                             
When looking at the definition of svg on which draw:enhanced-path is based on one                                                                                                             
can see that at the beginning of a path always a MoveTo command is needed.                                                                                                                    
                                                                                                                                                                                              
However when looking at what implementations are doing we see a different behaviour.                                                                                                          
When working on the implementation one of the Calligra developers noted differences                                                                                                           
in what OOo/MSO are doing to what Calligra is doing. OOo and MSO set the current                                                                                                              
point to the first point in the arc in case of A and W. Calligra uses 0 0. Using B                                                                                                            
and V would make the situation more clear.                                                                                                                                                    
                                                                                                                                                                                              
If one of the behaviours is correct it might be a good idea to improve the wording of                                                                                                         
the spec to make more clear what the correct behaviour is.

  was:
In the definition for draw:enhanced-path the current point definition seames to be                                                                                                            
unclear. What is the current Point for first subpath in an enhanced path shape?                                                                                                               
It is important to know for commands like A or W.                                                                                                                                             
When looking at the definition of svg on which draw:enhanced-path is based on one                                                                                                             
can see that at the beginning of a path always a MoveTo command is needed.                                                                                                                    
                                                                                                                                                                                              
However when looking at what implementations are doing we see a different behaviour.                                                                                                          
When working on the implementation one of the Calligra developers noted differences                                                                                                           
in what OOo/MSO are doing to what Calligra is doing. OOo and MSO set the current                                                                                                              
point to the first point in the arc in case of A and W. Calligra uses 0 0. Using B                                                                                                            
and V would make the situation more clear.                                                                                                                                                    
                                                                                                                                                                                              
If one of the behaviours is correct it might be a good idea to improve the wording of                                                                                                         
the spec to make more clear what the correct behaviour is.


There are two issues that we need to consider:  

1) What is the initial "current point"?

2) What is the new "current point" after each operation?

The SVG spec says explicitly that a path must begin with a Moveto operation:

http://www.w3.org/TR/SVG/paths.html#PathDataMovetoCommands

This ambiguity will go away if we converge on SVG.




> 19.145 draw:enhanced-path current point definition unclear.
> -----------------------------------------------------------
>
>                 Key: OFFICE-3710
>                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-3710
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: Bug
>          Components: Graphics
>    Affects Versions: ODF 1.2 COS 1
>            Reporter: Thorsten Zachmann
>
> In the definition for draw:enhanced-path the current point definition seemsto be                                                                                                            
> unclear. What is the current Point for first subpath in an enhanced path shape?                                                                                                               
> It is important to know for commands like A or W.                                                                                                                                             
> When looking at the definition of svg on which draw:enhanced-path is based on one                                                                                                             
> can see that at the beginning of a path always a MoveTo command is needed.                                                                                                                    
>                                                                                                                                                                                               
> However when looking at what implementations are doing we see a different behaviour.                                                                                                          
> When working on the implementation one of the Calligra developers noted differences                                                                                                           
> in what OOo/MSO are doing to what Calligra is doing. OOo and MSO set the current                                                                                                              
> point to the first point in the arc in case of A and W. Calligra uses 0 0. Using B                                                                                                            
> and V would make the situation more clear.                                                                                                                                                    
>                                                                                                                                                                                               
> If one of the behaviours is correct it might be a good idea to improve the wording of                                                                                                         
> the spec to make more clear what the correct behaviour is.

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