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Subject: RE: Re[2]: [cgmo-webcgm] Re:
At 09:56 PM 7/8/2004 +0200, Dieter Weidenbrueck wrote: >[...] > >-----Original Message----- > >From: Benoit Bezaire [mailto:benoit@itedo.com] > >Sent: Thursday, July 08, 2004 9:36 PM > >To: Dieter Weidenbrueck > >Cc: Lofton Henderson; cgmo-webcgm@lists.oasis-open.org > >Subject: Re[2]: [cgmo-webcgm] Re: > > > > > >DW> The coordinate system should be described as follows: > > > >DW> width = resulting mm width of VDC extent > >DW> height = resulting mm height of VDC extent > >Could I please get a pointer to read on how "resulting mm width/height > >of VDC extent" gets computed? > > >From CGM:1999: >"6.4.1 Scaling mode >VDC space may be either an abstract space, which may be mapped to an >arbitrary size on a physical device, or a metric space, which is [...] Long story short, this is how I read it (which I think agrees with Dieter). From the rules of CGM:1999 and WebCGM 1.0, every picture in a valid WebCGM has a VDC Extent with an inherent width in mm (call it W) and height in mm (call it H). When MM cordinates are used in DOM, then they refer to a coordinate space in which the VDC Extent rectangle has lower-left corner (0,0) and upper right corner (W,H). > > > >DW> top left coordinates: width,height (or 100%,100% where applicable) > >What does "or 100%, 100% where applicable" mean, where would it be > >applicable? > >I thought we had discussed to express coordinates of a hotspot either in >mm or in %. I am certainly happy with mm only to keep it simple. I am opposed to eliminating %. -Lofton.
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