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RE: ATAG2 Action: re: encode continuous input

From: Boland Jr., Frederick E. <frederick.boland@nist.gov>
Date: Wed, 3 Mar 2010 08:54:12 -0500
To: Jan Richards <jan.richards@utoronto.ca>
CC: WAI-AUWG List <w3c-wai-au@w3.org>
Message-ID: <D7A0423E5E193F40BE6E94126930C4930796EB703D@MBCLUSTER.xchange.nist.gov>
I think the example is helpful in clarification.  Thanks Jan!
Tim Boland NIST

-----Original Message-----
From: w3c-wai-au-request@w3.org [mailto:w3c-wai-au-request@w3.org] On Behalf Of Jan Richards
Sent: Tuesday, March 02, 2010 10:11 AM
Subject: ATAG2 Action: re: encode continuous input

Hi all (especially Tim who has an action to review this),

My action was to "To flesh out the watercolor example with more details
e.g. frequency and why it is practically hard to do with keyboard" - in
doing this I also added a bit of wording around web content properties:

content (web content)
Information and sensory experience to be communicated to the end user by
means of a user agent, including code or markup that defines the
content's structure, presentation, and interactions. In ATAG 2.0, the
term is primarily used to refer to the output that is produced by the
authoring tool. Content produced by authoring tools may include web
applications, including those that act as web-based authoring tools.
Accessible web content is web content that conforms to a particular
level of WCAG 2.0 (see Relationship to WCAG 2.0 section). Structured web
content is content that includes machine-readable internal structure
(e.g., markup elements), as opposed to unstructured content, such as
raster image formats or plain human language text.
*Web content properties* are the individual pieces of information that
make up the web content (e.g., the attributes and contents of elements,
stylesheet information, etc.). While many web content properties have
discrete values (e.g., a single value for size, color, font, etc.), some
types of web content (especially graphics) may includes properties that
can be said to *encode continuous input* because they incorporate
frequent data samples (e.g., the location, speed, pressure, angle, etc.
of a pointing device) . For example, a freehand line graphic object
might have a "continuous" path property that encodes thousands of
individual x-y location values, but "discrete" properties for setting
the color and thickness of the line. A "watercolor stroke" graphic
object might have multiple "continuous" properties (e.g., path, speed,
pressure) in order to graphically mimic the diffusion effects that occur
when a real paint brush is moved in a similar manner.

Received on Wednesday, 3 March 2010 13:54:52 UTC

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