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Re: Linear gradients, Transforms and angles...

From: David Singer <singer@apple.com>
Date: Tue, 21 Sep 2010 16:21:39 -0700
Cc: Chris Marrin <cmarrin@apple.com>, Simon Fraser <smfr@me.com>, Daniel Glazman <daniel.glazman@disruptive-innovations.com>, "L. DavidBaron" <dbaron@dbaron.org>, "Tab Atkins Jr." <jackalmage@gmail.com>, www-style list <www-style@w3.org>
Message-Id: <52675B56-C328-4F64-8898-BE86582DCF4B@apple.com>
To: Brad Kemper <brad.kemper@gmail.com>

On Sep 21, 2010, at 11:21 , Brad Kemper wrote:

>> And there is a long tradition in mathematics of the positive Y axis going up. But in HTML the Y axis goes down, because of the (western) tradition of reading from top to bottom.
> I don't see how that is relevant to traditions of angle-based linear directions. You can still have 0deg=left-to-right and 90deg=bottom-to-top when y++ progresses downward. .

whoa, the normal expectation is that 0 is the x-axis and that increasing angles move towards the positive Y-axis at 90 degrees (or the appropriate number of radians :-)).

David Singer
Multimedia and Software Standards, Apple Inc.
Received on Tuesday, 21 September 2010 23:22:12 UTC

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