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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 2015-02-06 00:28 -0500
Organization None
Message-ID <mb1jcb$74r$1@dont-email.me> (permalink)
References <d9b67bb2-7621-4fcf-ac46-dc41636aefb2@googlegroups.com> <+TKXP$iteozUFw0f@invalid.uk.co.demon.merlyn.invalid> <mascd6$7il$1@dont-email.me> <9M4noTB5m$0UFw8c@invalid.uk.co.demon.merlyn.invalid> <44234e66-b687-4fb2-859d-a3af02e1fbee@googlegroups.com>

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On Thu, 5 Feb 2015 20:32:34 -0800 (PST), Michael Haufe (TNO) wrote:

> or... take a look at the "globalCompositeOperation" property:
> 
> <https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Compositing>

Goodness. I had no idea that there were so many available drawing
operations.

But for the original poster, it looks like "Clipping paths" described near
the bottom of the page you refernced would do a better job.  (Drawing and
then hiding a particular shape.)

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

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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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