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comp / comp.lang.tcl / canvas pixel commands?

SubjectAuthor
* canvas pixel commands?saito
`* canvas pixel commands?clt.to.davebr
 `- Re: canvas pixel commands?saito

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Subject: canvas pixel commands?
From: saito
Newsgroups: comp.lang.tcl
Organization: A noiseless patient Spider
Date: Wed, 30 Oct 2024 20:40 UTC
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From: saitology9@gmail.com (saito)
Newsgroups: comp.lang.tcl
Subject: canvas pixel commands?
Date: Wed, 30 Oct 2024 16:40:08 -0400
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Does the canvas allow for pixel level access? I am mostly interested in
getting the color at a certain pixel within the canvas.

Subject: canvas pixel commands?
From: clt.to.davebr@dfgh.net
Newsgroups: comp.lang.tcl
Organization: A noiseless patient Spider
Date: Sun, 3 Nov 2024 02:53 UTC
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From: clt.to.davebr@dfgh.net
Newsgroups: comp.lang.tcl
Subject: canvas pixel commands?
Date: Sun, 03 Nov 24 02:53:32 GMT
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>From: saito <saitology9@gmail.com>
>Date: Wed, 30 Oct 2024 16:40:08 -0400
>Subject: canvas pixel commands?

>Does the canvas allow for pixel level access? I am mostly interested in
>getting the color at a certain pixel within the canvas.

The Img package includes img-window that can create a Tk photo image of the canvas window.

More recent Tk's (9.0?) have a canvas subcommand image that creates a Tk photo image of the canvas.

Once you have a Tk photo image, the get subcommand can read any pixel.

Dave B

Subject: Re: canvas pixel commands?
From: saito
Newsgroups: comp.lang.tcl
Organization: A noiseless patient Spider
Date: Sun, 3 Nov 2024 19:04 UTC
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From: saitology9@gmail.com (saito)
Newsgroups: comp.lang.tcl
Subject: Re: canvas pixel commands?
Date: Sun, 3 Nov 2024 14:04:15 -0500
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On 11/2/2024 10:53 PM, clt.to.davebr@dfgh.net wrote:
>
> More recent Tk's (9.0?) have a canvas subcommand image that creates a Tk photo image of the canvas.
>
> Once you have a Tk photo image, the get subcommand can read any pixel.

Thank you.

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