How to avoid vertical space between blocks containing images

[fopaddict]

My .fo code contains nothing but a sequence of images exactly fitting into page height (because page margins are defined accordingly):

        <fo:block space-before="0mm" space-after="0mm">
                <fo:external-graphic src="url(images/{@picture})" />
        </fo:block>

When printing to the page, FOP 0.94 and 0.95 are inserting 2mm vertical space between each block. Only when I set space-after to -2mm, the output is as I would expect it normally (exactly no gap between images). Is there another way to keep FOP from adding space in general? If not: How do I know how much I have to subtract in order to get zero space?

[Peter Coppens]

Perhaps you find inspiration in

http://www.antennahouse.com/support/qa/QA/2005052701.html

"Because fo:external-graphic is an inline element, it makes line area. The
default height of line area is 1.2em, so you should specify line-height="1"
for the block.

However, even though line-height="1" is specified, a graphic is placed on
top of a baseline and there remains a space under the baseline as a result.
In order to avoid this, you should specify font-size="0pt", too."

Hth

Peter

> From: fopaddict <richard@...>
> Reply-To: <fop-users@...>
> Date: Sun, 8 Nov 2009 01:36:49 -0800 (PST)
> To: <fop-users@...>
> Subject: How to avoid vertical space between blocks containing images
>
>
> My .fo code contains nothing but a sequence of images exactly fitting into
> page height (because page margins are defined accordingly):
>
> <fo:block space-before="0mm" space-after="0mm">
> <fo:external-graphic src="url(images/{@picture})" />
> </fo:block>
>
> When printing to the page, FOP 0.94 and 0.95 are inserting 2mm vertical
> space between each block. Only when I set space-after to -2mm, the output is
> as I would expect it normally (exactly no gap between images). Is there
> another way to keep FOP from adding space in general? If not: How do I know
> how much I have to subtract in order to get zero space?
>
> --
> View this message in context:
> http://old.nabble.com/How-to-avoid-vertical-space-between-blocks-containing-im
> ages-tp26252057p26252057.html
> Sent from the FOP - Users mailing list archive at Nabble.com.
>
>
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> To unsubscribe, e-mail: fop-users-unsubscribe@...
> For additional commands, e-mail: fop-users-help@...
>

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[Pascal Sancho]

Hi list,

This is due to how FOP (and other FO engines) handles half-leading (Cf
REC 1.1 §4.5: line-area [1] and $6.5.2 - fo:block [2])
To avoid blank space between 2 contigous blocks containing only
graphical materials, you should ensure that both line-height and
font-size traits are set to zero.

As line-height initial value is [1.2] (witch means 1.2 * font-size),
setting font-size property to 0pt is sufficient.

[1] http://www.w3.org/TR/2006/REC-xsl11-20061205/#area-line
[2] http://www.w3.org/TR/2006/REC-xsl11-20061205/#fo_block

HTH,

Pascal

Peter Coppens a écrit :

> Perhaps you find inspiration in
> http://www.antennahouse.com/support/qa/QA/2005052701.html
> "Because fo:external-graphic is an inline element, it makes line area. The
> default height of line area is 1.2em, so you should specify line-height="1"
> for the block.
> However, even though line-height="1" is specified, a graphic is placed on
> top of a baseline and there remains a space under the baseline as a result.
> In order to avoid this, you should specify font-size="0pt", too."
> Hth
> Peter
>  
>> From: fopaddict <richard@...>
>>
>> My .fo code contains nothing but a sequence of images exactly fitting into
>> page height (because page margins are defined accordingly):
>> <fo:block space-before="0mm" space-after="0mm">
>> <fo:external-graphic src="url(images/{@picture})" />
>> </fo:block>
>> When printing to the page, FOP 0.94 and 0.95 are inserting 2mm vertical
>> space between each block. Only when I set space-after to -2mm, the output is
>> as I would expect it normally (exactly no gap between images). Is there
>> another way to keep FOP from adding space in general? If not: How do I know
>> how much I have to subtract in order to get zero space?
>>    

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[fopaddict]

Pascal and Peter,
perfect answer, it works for FOP 0.94 and 0.95 with font-size="0".
Regards,
Richard

Pascal Sancho wrote:

Hi list,

This is due to how FOP (and other FO engines) handles half-leading (Cf
REC 1.1 §4.5: line-area [1] and $6.5.2 - fo:block [2])
To avoid blank space between 2 contigous blocks containing only
graphical materials, you should ensure that both line-height and
font-size traits are set to zero.

As line-height initial value is [1.2] (witch means 1.2 * font-size),
setting font-size property to 0pt is sufficient.

[1] http://www.w3.org/TR/2006/REC-xsl11-20061205/#area-line
[2] http://www.w3.org/TR/2006/REC-xsl11-20061205/#fo_block

HTH,

Pascal

Peter Coppens a écrit :
> Perhaps you find inspiration in
> http://www.antennahouse.com/support/qa/QA/2005052701.html
> "Because fo:external-graphic is an inline element, it makes line area. The
> default height of line area is 1.2em, so you should specify line-height="1"
> for the block.
> However, even though line-height="1" is specified, a graphic is placed on
> top of a baseline and there remains a space under the baseline as a result.
> In order to avoid this, you should specify font-size="0pt", too."
> Hth
> Peter
>  
>> From: fopaddict <[e-mail]>
>>
>> My .fo code contains nothing but a sequence of images exactly fitting into
>> page height (because page margins are defined accordingly):
>> <fo:block space-before="0mm" space-after="0mm">
>> <fo:external-graphic src="url(images/{@picture})" />
>> </fo:block>
>> When printing to the page, FOP 0.94 and 0.95 are inserting 2mm vertical
>> space between each block. Only when I set space-after to -2mm, the output is
>> as I would expect it normally (exactly no gap between images). Is there
>> another way to keep FOP from adding space in general? If not: How do I know
>> how much I have to subtract in order to get zero space?
>>    


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[Tobias Anstett [k15t.com]]

Hi,

I have the same problem as Richard. Setting font-size="0" does not
really work for me. Although the space is gone I still have a very
thin border around the pictures. I realized this using a block with
background-color and ebmbedded image. When I use zoom factor above
150% I can see it clearly in my PDFs. I guess this is no FOP issue
because I get the same results in XEP.
I already set any space-* and padding-* values to 0. Any ideas?

Cheers,
Tobias


On Fri, Nov 13, 2009 at 11:19 AM, fopaddict <richard@...> wrote:

>
> Pascal and Peter,
> perfect answer, it works for FOP 0.94 and 0.95 with font-size="0".
> Regards,
> Richard
>
>
> Pascal Sancho wrote:
>>
>> Hi list,
>>
>> This is due to how FOP (and other FO engines) handles half-leading (Cf
>> REC 1.1 §4.5: line-area [1] and $6.5.2 - fo:block [2])
>> To avoid blank space between 2 contigous blocks containing only
>> graphical materials, you should ensure that both line-height and
>> font-size traits are set to zero.
>>
>> As line-height initial value is [1.2] (witch means 1.2 * font-size),
>> setting font-size property to 0pt is sufficient.
>>
>> [1] http://www.w3.org/TR/2006/REC-xsl11-20061205/#area-line
>> [2] http://www.w3.org/TR/2006/REC-xsl11-20061205/#fo_block
>>
>> HTH,
>>
>> Pascal
>>
>> Peter Coppens a écrit :
>>> Perhaps you find inspiration in
>>> http://www.antennahouse.com/support/qa/QA/2005052701.html
>>> "Because fo:external-graphic is an inline element, it makes line area.
>>> The
>>> default height of line area is 1.2em, so you should specify
>>> line-height="1"
>>> for the block.
>>> However, even though line-height="1" is specified, a graphic is placed on
>>> top of a baseline and there remains a space under the baseline as a
>>> result.
>>> In order to avoid this, you should specify font-size="0pt", too."
>>> Hth
>>> Peter
>>>
>>>> From: fopaddict <richard@...>
>>>>
>>>> My .fo code contains nothing but a sequence of images exactly fitting
>>>> into
>>>> page height (because page margins are defined accordingly):
>>>> <fo:block space-before="0mm" space-after="0mm">
>>>> <fo:external-graphic src="url(images/{@picture})" />
>>>> </fo:block>
>>>> When printing to the page, FOP 0.94 and 0.95 are inserting 2mm vertical
>>>> space between each block. Only when I set space-after to -2mm, the
>>>> output is
>>>> as I would expect it normally (exactly no gap between images). Is there
>>>> another way to keep FOP from adding space in general? If not: How do I
>>>> know
>>>> how much I have to subtract in order to get zero space?
>>>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: fop-users-unsubscribe@...
>> For additional commands, e-mail: fop-users-help@...
>>
>>
>>
>
> --
> View this message in context: http://old.nabble.com/How-to-avoid-vertical-space-between-blocks-containing-images-tp26252057p26334354.html
> Sent from the FOP - Users mailing list archive at Nabble.com.
>
>
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[Pascal Sancho]

Hi Tobias,
For further investigation, we need short XSL-FO and an image that
demonstrates what you say.

Possible reason: line-height trait not equal to zero.

The line-height trait value is resolved in different way depending on
how the corresponding property is set (see [1]:
 - when <number> is used, <number> is inherited
 - otherwise, the computed value is inherited.

Here is a short example that explains the difference:

<fo:aaa font-size="10pt" line-height="1.2">
   <!-- line-height trait is 10pt * 1.2 = 12pt -->
   <fo:bbb font-size="0pt">
       <!-- inherited line-height property is 1.2 -->
       <!-- line-height trait is 0pt * 1.2 = 12pt -->
  </fo:bbb>
</fo:aaa>
<fo:aaa font-size="10pt" line-height="120%">
   <!-- line-height trait is 10pt * 120% = 12pt -->
   <fo:bbb font-size="0pt">
       <!-- inherited line-height property is 12pt -->
       <!-- line-height trait is 12pt -->
  </fo:bbb>
</fo:aaa>

You should verify if in your XSL-FO, line-height is not set with other
than <number>.

Pascal

[1] http://www.w3.org/TR/2006/REC-xsl11-20061205/#line-height


Tobias Anstett [k15t.com] a écrit :

> Hi,
>
> I have the same problem as Richard. Setting font-size="0" does not
> really work for me. Although the space is gone I still have a very
> thin border around the pictures. I realized this using a block with
> background-color and ebmbedded image. When I use zoom factor above
> 150% I can see it clearly in my PDFs. I guess this is no FOP issue
> because I get the same results in XEP.
> I already set any space-* and padding-* values to 0. Any ideas?
>
> Cheers,
> Tobias

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