RE: fontSize and percentages

Hi Yves,

The draft text for the next edition of the specification, at http://www.w3.org/TR/ttaf1-dfxp/#style-attribute-fontSize includes a note that hopefully answers your question, as well as making clear that when only one length value is specified it applies equally to horizontal and vertical scaling, and is proportional to the cell size when specifed as a percentage.

The answer to your first question is yes, the width is 640/32 * 75% = 15.

Non-proportional scaling is the expected behaviour to allow font sizes that are 2 rows in height and 1 column in width to be denoted.

Nigel

________________________________
From: Nigel Megitt
Sent: 19 August 2013 12:02
To: De Muyter, Yves (Contractor); public-tt@w3.org
Subject: RE: fontSize and percentages

________________________________
From: De Muyter, Yves (Contractor) [Yves.DeMuyter@eu.sony.com]
Sent: 19 August 2013 08:30
To: public-tt@w3.org
Subject: fontSize and percentages

Hello,

I have a question regarding percentages on fontSize and having 1 or 2 values on the tts:fontSize attribute.

Given this example (some unneeded attributes are omitted for readability):

<tt tts:extent="640px 480px" ttp:cellResolution="32 15">
<head>
<layout>
                <region xml:id="r1" tts:fontFamily="monospace"  tts:fontSize="75%">
</layout>
</head>
<body>
                <div region="r1">
                                <p>This is text</p>
                </div>
</body>
</tt>

It means the height of the fontsize is 480/15 * 75% = 24

Does it also mean the width of the fontsize is 640/32 * 75% = 15  ?

Or does it mean we need to use the scaling value of the height and apply that equally to the width to have proportional scaling ? The spec doesnıt clearly say that having a single scaling factor means you need to have proportional scaling, thatıs why Iım hesitating right now for this detail.

Yves De Muyter
Techsoft Centre
Technology and Software Centre Europe (TSCE)

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Received on Monday, 19 August 2013 11:12:08 UTC