ISSUE: the method name 'setViewPort'

[Lofton Henderson <lofton@rockynet.com>]

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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