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FW: LC Comment - Syncbase events and Progressive Rendering

From: Andrew Sledd <Andrew.Sledd@zoomon.com>
Date: Wed, 24 Nov 2004 11:32:00 +0100
Message-ID: <586AE9F507AF5E4AA45364333D9E2FA2010326BD@sesthsrv02.zoomon.local>
To: <www-svg@w3.org>

Dear SVG WG,
The progressive rendering description and examples do not include presentation of document timing and animation impact. We request that this section be updated to include such information, especially in the case where timelineBegin="onStart".

See the following example

<svg timelineBegin="onStart">
		
		<circle stroke="white" stroke-width="30" fill="none" cx="100" cy="200" r="60">
			<animate id="fadein" attributeName="stroke" attributeType="auto" from="white" to="#666" begin="0" dur="3s" fill="freeze"/>
		</circle>
		
		<rect id="Rect" x="20" y="20" width="180" height="180" fill="#fff">
			<animate id="fadein2" attributeName="fill" attributeType="auto" from="#fff" to="red" begin="fadein.begin" dur="3s" fill="freeze"/>
		</rect>
		
		<circle id="Circle" stroke="white" stroke-width="20" fill="none" cx="200" cy="110" r="80">
			<animate id="fadein3" attributeName="stroke" attributeType="auto" from="white" to="#666" begin="fadein2.begin" dur="3s" fill="freeze"/>
		</circle>
		
</svg>

What is the expected behavior in a progressive rendering situation where the UA renders on each element's startElement and endElement SAX events?

Our interpretation is that only the fadein animation is run as the begin event is raised and rendered before any of the other elements are resolved. So if the background was "white" each of the rect id="Rect" and the circle id="Circle" would be rendered, although they would not be seen because they are white. Their respective child animations would never be run.

Is this correct?

Regards,
ZOOMON
Andrew Sledd
Received on Wednesday, 24 November 2004 13:13:55 UTC

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