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Re: About arc command

From: Dirk Schulze <dschulze@adobe.com>
Date: Thu, 10 May 2012 19:24:29 -0700
To: David Dailey <ddailey@zoominternet.net>
CC: 向雅 <fyaoxy@gmail.com>, "www-svg@w3.org" <www-svg@w3.org>
Message-ID: <4CF3A3C0-9ED6-49A7-B71E-B1BD3B83CA25@adobe.com>
I also like the description on MDN with good examples:

https://developer.mozilla.org/en/SVG/Tutorial/Paths


Greetings,
Dirk

On May 11, 2012, at 3:14 AM, David Dailey wrote:

> To be honest, I usually end up trying all four values of the arc-flag and sweep-flag before I remember how they're suppose to work.
> 
> Perhaps the example at http://www.w3.org/Graphics/SVG/IG/resources/svgprimer.html#path_A might help.
> 
> Cheers
> David
> 
> -----Original Message-----
> From: saintofqin@gmail.com [mailto:saintofqin@gmail.com] On Behalf Of ??
> Sent: Thursday, May 10, 2012 8:49 PM
> To: www-svg@w3.org
> Subject: About arc command
> 
> Hi,
> I'm doing a svg style implementation.
> arcing. check out the document, seems some words not so right:) 1, sweep flag:
> I checkout wiki, there is no "positive-angle" speaking. as programmer, I can get,  it just step or delta value >0.
> but other users maybe get it better, if other common word used, f.e, counter(anti)-clockwise, or left(right) handle law.
> IMO, even "ccw" better than sweep.
> 2, implnote F.6.5, step4, eval the included angle, the acos result range from 0-PI, but document stats:
> where θ1 is fixed in the range −360° < Δθ < 360° Indeed, it misguide me.
> Though not use math thing long years, I get back ever feeling at math by bad reviewing the lessons, and send this message.
> 
> BTW I hope my english speaking got.
> If have some problem, I can send message again with more syntaxed thing.
> 
> Regards
> Qinxian
> 
> 
> 
> 
> 

Received on Friday, 11 May 2012 02:25:15 GMT

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