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Posted to fop-dev@xmlgraphics.apache.org by Venkat Reddy <va...@googlemail.com> on 2009/10/01 16:52:23 UTC

Page Overlay (IPO) Extension

Hi,

I want to include X and Y coordinates to the <afp:include-page-overlay> 
definition, something like below....

      <afp:include-page-overlay id="IPO001" name="O1tcgas1" *x="300" 
y="500"*/>

in PageObject.java, the following method will be used when there is an 
overlay referenced in a FO document.
    public void *createIncludePageOverlay*(String name, *int x, int y*, 
int orientation)

where the X and Y coordinates hardcoded as '0' in *DataStream.java*. I 
want to pass these values through the above page overlay definition, Can 
someone tell me, how do I pass these coordinates?

Thanks,
Venkat.

Re: Page Overlay (IPO) Extension

Posted by Venkat Reddy <va...@googlemail.com>.

Hi Jeremias,

Thanks for your help. I have done few changes to the 
AFPPageSetupElement.java, and the offset coordinates are working infact. 
I just want to know more on your other point mentioned in your reply 
'offset coordinates user-friendly'...

There is some code I have found in

    *org.apache.fop.afp.AFPUnitConverter*

, namely the method

    *public int[] mpts2units(float[] srcPts)*

Is this the same method you are suggesting me to use to map the 
user-friendly offset coordinates to get converted into float values?

Thanks,
Venkat.

Jeremias Maerki wrote:
> Venkat,
>
> first of all you probably need to subclass AFPPageSetupElement to add
> support for carrying the offset coordinates. AFPElementMapping would
> then also need to be changed. Then you'd need to move on to
> AFPDocumentHandler.handleExtensionObject where the extension is
> converted into calls into the AFP library.
> DataStream.createIncludePageOverlay would then also need to be extended.
> And so on and on...
>
> I guess one challenge is to make the specification of the offset
> user-friendly. I don't think it's acceptable to expect from the user to
> know what numeric value would need to be specified to get the right
> placing. Maybe you can reuse something from the FO property subsystem to
> parse arbitrary lengths, internally work with millipoints and then
> convert that to the final value.
>
> On 01.10.2009 16:52:23 Venkat Reddy wrote:
>   
>> Hi,
>>
>> I want to include X and Y coordinates to the <afp:include-page-overlay> 
>> definition, something like below....
>>
>>       <afp:include-page-overlay id="IPO001" name="O1tcgas1" *x="300" 
>> y="500"*/>
>>
>> in PageObject.java, the following method will be used when there is an 
>> overlay referenced in a FO document.
>>     public void *createIncludePageOverlay*(String name, *int x, int y*, 
>> int orientation)
>>
>> where the X and Y coordinates hardcoded as '0' in *DataStream.java*. I 
>> want to pass these values through the above page overlay definition, Can 
>> someone tell me, how do I pass these coordinates?
>>
>> Thanks,
>> Venkat.
>>     
>
>
>
>
> Jeremias Maerki
>
>
>

Re: Page Overlay (IPO) Extension

Posted by Jeremias Maerki <de...@jeremias-maerki.ch>.

Venkat,

first of all you probably need to subclass AFPPageSetupElement to add
support for carrying the offset coordinates. AFPElementMapping would
then also need to be changed. Then you'd need to move on to
AFPDocumentHandler.handleExtensionObject where the extension is
converted into calls into the AFP library.
DataStream.createIncludePageOverlay would then also need to be extended.
And so on and on...

I guess one challenge is to make the specification of the offset
user-friendly. I don't think it's acceptable to expect from the user to
know what numeric value would need to be specified to get the right
placing. Maybe you can reuse something from the FO property subsystem to
parse arbitrary lengths, internally work with millipoints and then
convert that to the final value.

On 01.10.2009 16:52:23 Venkat Reddy wrote:
> Hi,
> 
> I want to include X and Y coordinates to the <afp:include-page-overlay> 
> definition, something like below....
> 
>       <afp:include-page-overlay id="IPO001" name="O1tcgas1" *x="300" 
> y="500"*/>
> 
> in PageObject.java, the following method will be used when there is an 
> overlay referenced in a FO document.
>     public void *createIncludePageOverlay*(String name, *int x, int y*, 
> int orientation)
> 
> where the X and Y coordinates hardcoded as '0' in *DataStream.java*. I 
> want to pass these values through the above page overlay definition, Can 
> someone tell me, how do I pass these coordinates?
> 
> Thanks,
> Venkat.

Jeremias Maerki