- From: Anthony Grasso <anthony.grasso@cisra.canon.com.au>
- Date: Mon, 23 Mar 2009 16:50:41 +1100
- To: "G. Wade Johnson" <gwadej@anomaly.org>
- CC: www-svg@w3.org
Hi G. Wade, Thank you for your comments on the SVG Transforms specification. The feedback has been placed in our public tracker[1][2] and the SVG Working Group will discuss the comments in the next few telephone conferences. Kind Regards, Anthony Grasso [1] http://www.w3.org/Graphics/SVG/WG/track/issues/2250 [2] http://www.w3.org/Graphics/SVG/WG/track/issues/2251 G. Wade Johnson wrote: > Some quick feedback. > > 1. In section 3. TransformList Extensions, under scale(<sx> [<sy> > [<sz>]]) > > This states "If <sy> and <sz> are not provided, it is assumed to be > equal to <sx>." What is the value of <sz> if <sx> and <sy> are > provided? If all objects are actually 2D, does scaling have any effect > beyond the translation effect due to the Z coordinate scaling? > > 2. In section 3. TransformList Extensions, under > rotate(<rotate-angle> <nx> <ny> <nz> [<cx> <cy> <cz>]) > > An example showing what new construct would be equivalent to the old > rotate might help. (Other than rotateZ( <angle> [<cx> <cy>] )) I guess > I just don't understand the parameters <nx> <ny> <nz>. > > 3. In section 5. Converting a 4x4 to a 3x3 matrix, paragraph 5, "the > eqation is derived" should be "the equation is derived" > > 4. General conceptual feedback > > I see that the viewing plane is defined as z=0, but I don't see any > mention of whether z increases toward the viewer or away from the > viewer. > > Personally, I see increasing z as getting farther from me, but I could > also argue that larger z should be in front of smaller z. Obviously, > this needs to be specified. > > 5. General conceptual feedback > > What is the visual effect of objects that are in front of the viewing > plane? Are they "behind us" or in front of everything? > > ------- > Despite these items, this looks really good to me. (I really want > transform-origin right now.<grin/>) > > G. Wade
Received on Monday, 23 March 2009 05:51:23 UTC