- From: Dirk Schulze <dschulze@adobe.com>
- Date: Thu, 21 Mar 2013 11:59:05 -0700
- To: "Tab Atkins Jr." <jackalmage@gmail.com>
- CC: Rik Cabanier <cabanier@gmail.com>, James Robinson <jamesr@google.com>, Benoit Jacob <jacob.benoit.1@gmail.com>, "public-fx@w3.org" <public-fx@w3.org>
On Mar 21, 2013, at 11:52 AM, "Tab Atkins Jr." <jackalmage@gmail.com> wrote: > On Thu, Mar 21, 2013 at 11:47 AM, Rik Cabanier <cabanier@gmail.com> wrote: >> On Thu, Mar 21, 2013 at 11:36 AM, James Robinson <jamesr@google.com> wrote: >>> On Thu, Mar 21, 2013 at 11:33 AM, Rik Cabanier <cabanier@gmail.com> wrote: >>>> I'll formally object to an exception being thrown here. >>>> >>>> SVG matrix throws an exception and since this is a drop-in replacement, >>>> Matrix needs to throw one too :-( >>> >>> This is a clear example of SVG making a (bad) mistake that we should not >>> inflict on the rest of the web platform. >> >> Are you objecting to any exceptions being thrown? >> There are exceptions in all authors facing APIs. > > No, he objects for the same reason I am - a matrix being singular is > not a particularly exceptional situation A singular matrix does not mean the same as NaN and Inf values in the matrix. However, you need to take a look when you use inverse() for transformation matrices (again, that is the focus here). They are used to transform between coordinate spaces. And then a returning singular matrix does not make sense. Dirk > , and whether an > implementation considers a matrix singular will depend in some cases > on the exact algorithm and FP implementation being used. This is, > thus, a *terrible* example of a place to throw an exception, as > authors won't expect it, and it'll vary between platforms for no > important reason. > > ~TJ >
Received on Thursday, 21 March 2013 18:59:58 UTC