RE: [cgmo-webcgm] ISSUE: the method name 'setViewPort'

["Galt, Stuart A" <stuart.a.galt@boeing.com>]

setViewBox sounds great to me.

Stuart
 

> -----Original Message-----
> From: Lofton Henderson [mailto:lofton@rockynet.com] 
> Sent: Sunday, April 13, 2008 11:03 AM
> To: CGM Open WebCGM TC
> Subject: [cgmo-webcgm] ISSUE: the method name 'setViewPort'
> 
> Hi all --
> 
> This is not a big technical issue, but I'm a little 
> uncomfortable with the calling the pan-zoom rectangle 
> "viewport".  Reasons:
> 
> 1.) That is the name of a <param> element (sub-element of the <object>
> element) that is being deprecated.  Although it has the same 
> meaning as described for 'viewport' <param>, I think that 
> description is less-than-ideal because...
> 
> 2.) From my past work in ISO graphics standards, "viewport" 
> typically refers to something in *device* (display) 
> coordinate space, which is the mapping target of a window in 
> user space (the latter being VDC or NVDC, in our case).
> 
> 3.) Altho' I find it slightly unclear in some places, SVG 
> seems to use "viewport" in approximately that (#2) way -- it 
> refers to a target mapping rectangle in device/media space.  
> The closest SVG thing to our pan-zoom rectangle seems to be 
> SVG's viewBox attribute.  See [1], especially sections 7.1, 
> 7.2 and 7.7.
> 
> Suggestion:  how about just setPanZoom?  (Alternative:  mimic 
> SVG exactly and call it setViewBox.)
> 
> Thoughts?
> 
> -Lofton.
> 
> At 03:04 PM 3/24/2008 -0700, Galt, Stuart A wrote:
> >Hello,
> >
> >Chapter 1 - no changes
> >Chapter 2 - no changes
> >Chapter 3 - no changes
> >Chapter 4 - no changes
> >
> >Chapter 5
> >
> >In 5.7.5
> >Add to the IDL
> >
> >void              setViewPort (in WebCGMString port);
> >
> >In the methods section add:
> >
> >setViewPort
> >Sets the viewport to the specified rectangle expressed in NVDC units.
> >
> >To set the viewport around two APS you could get the object 
> extent of 
> >both APS and then set the viewport to the new rectangle 
> defined by the 
> >minimum x value, minimum y value, maximum x value, maximum y value.
> >
> >Parameter
> >                 port of type WebCGM String
> >                 The two corner points of a rectangle in NVDC
> >
> >Exceptions
> >No exceptions.
> >
> >chapter 6 - no changes
> >chapter 7 - no changes
> >chapter 8 -
> >
> >add to the WebCGM object methods
> >The WebCGMPicture object has the following methods:
> >...
> >setViewPort(port)
> >         This method has no return value.
> >         The port parameter is of type String.
> >
> >
> >
> >--
> >Stuart Galt
> >SGML Resource Group
> >stuart.a.galt@boeing.com
> >(206) 544-3656
> >
> >
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> 
> 
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