[PD-dev] Canvas and ojb/cnv arguments in .pd

[Hans-Christoph Steiner]

Check out "Pd File Format" at the bottom of this page:

http://puredata.org/docs/developer/

Also, that document is included in the Pd-extended distro.

.hc

On Jan 22, 2006, at 3:40 PM, Dave S wrote:

> Hello All,
>
> I'm trying to determine what arguments are used by PD to create a  
> canvas.
>
> I've determined the following:
>
> A "parent" canvas (i.e. top-level window) has the following arguments:
>
> #N canvas (
> 	0 = top
> 	0 = left
> 	772 = width
> 	532 = height
> 	12 = font-size
> 	)
>
> As in:
> #N canvas 0 0 772 532 12;
>
>
> However, a canvas created as an object inside a window has the  
> following
> arguments:
> #X obj (
> 	0 = top
> 	0 = left
> 	cnv = (
> 		15 = selectable area size
> 		768 = width
> 		22 = height
> 		cnv_heading_S = send name
> 		cnv_heading_R = receive name
> 		All_About_Canvases = title
> 		12 = title-left-offset
> 		12 = title-top-offset
> 		0 = font-face
> 		14 = font-size
> 		-233017 = background-color
> 		-1 = foreground-color
> 		0 = UNKNOWN?????????????????????????
> 		);
>
> As in:
> #X obj 0 0 cnv 15 768 22 cnv_heading_S cnv_heading_R  
> All_About_Canvases 12
> 12 0 14 -233017 -1 0;
>
> I have three questions:
>
> 1.  What is the LAST argument of cnv used for (the "UNKNOWN" one  
> above)? My
> best guess is that it's an integer which indicates Graph on Parent? Or
> perhaps it's an "id" of some kind?)
>
> 2.  What format are the colours?  -1 = black? 1 = white?  What  
> standard is
> this? (it's not hex, it's not RGB)?
>
> 3. By the parenthesis above, you can see that I assume that the "obj"
> structure accepts three arguments (with the THIRD argument being the  
> cnv
> structure). -- is this observation accurate?
>
>
> Thank you.
> Dave Sabine
>
>
>
>
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>

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