Re: canvas; draw vector then restore overwritten area later

From	Mike Duffy <md_004@videotron.ca>
Newsgroups	comp.lang.javascript
Subject	Re: canvas; draw vector then restore overwritten area later
Date	2015-02-05 20:34 -0500
Organization	None
Message-ID	<mb15ls$509$1@dont-email.me> (permalink)
References	<d9b67bb2-7621-4fcf-ac46-dc41636aefb2@googlegroups.com> <+TKXP$iteozUFw0f@invalid.uk.co.demon.merlyn.invalid> <mascd6$7il$1@dont-email.me> <9M4noTB5m$0UFw8c@invalid.uk.co.demon.merlyn.invalid>

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On Thu, 5 Feb 2015 23:16:09 +0000, Dr J R Stockton wrote:

> That raises two questions.  Does the OP use SVG, and do I use SVG? 

Sorry, it has been a while since I did some SVG graphics, and I
mis-remembered "canvas" as being part of the SVG specification. (i.e. the
area (width & height) specified in the root xml tag).

As you have pointed out, these are 2 distinct graphics methodologies. 

> Someone should suggest to WHATWG that the method strokeStyle should
> accept an argument "xor" for this purpose.

Yes. Also that one argument can be the currently-rendered existing pixel
value. As well as one should be able to explicitely specify the arguments
for the XOR operation.

-- 
http://pages.videotron.com/duffym/index.htm

Thread

canvas; draw vector then restore overwritten area later catebekensail@yahoo.com - 2015-01-31 11:19 -0800
  Re: canvas; draw vector then restore overwritten area later "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2015-01-31 20:36 +0100
  Re: canvas; draw vector then restore overwritten area later Denis McMahon <denismfmcmahon@gmail.com> - 2015-01-31 20:09 +0000
  Re: canvas; draw vector then restore overwritten area later Dr J R Stockton <reply1500@merlyn.demon.co.uk.invalid> - 2015-02-01 20:08 +0000
    Re: canvas; draw vector then restore overwritten area later Mike Duffy <md_004@videotron.ca> - 2015-02-04 00:58 -0500
      Re: canvas; draw vector then restore overwritten area later Dr J R Stockton <reply1500@merlyn.demon.co.uk.invalid> - 2015-02-05 23:16 +0000
        Re: canvas; draw vector then restore overwritten area later Mike Duffy <md_004@videotron.ca> - 2015-02-05 20:34 -0500
        Re: canvas; draw vector then restore overwritten area later "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2015-02-05 20:32 -0800
          Re: canvas; draw vector then restore overwritten area later Mike Duffy <md_004@videotron.ca> - 2015-02-06 00:28 -0500
  Re: canvas; draw vector then restore overwritten area later "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2015-02-01 18:58 -0800

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