[MEI-L] Coordinate system confusion
Daniel Alles
DanielAlles at stud.uni-frankfurt.de
Tue Jul 4 14:48:56 CEST 2017
Dear all,
at the moment, I am a little bit confused about how MEI defines its
coordinate system: It is possible to add the attributes @ulx, @uly,
@lrx and @lry to for example a surface, as written in part 12 of the
Guidelines, which places the origin of the coordinate system in the
upper left corner. All the examples in that part show that behavior,
ulx/uly is always 0/0. This would correspond to the coordinate systems
used in SVG and DOM and (which is what I use for my work) Edirom
Editor. On the other hand it is written in part 22.3, that MEI uses a
coordinate system in which "the y-axis points from bottom up". That
would mean, that ulx/uly could never be 0/0.
So now my questions: Is it sufficient to use the coordinates like in
the examples, with the origin in the upper left corner? Would that
"override" MEIs original coordinate system? If not: Isn't the
possibility to encode areas from top-left to bottom-right corners a
semantic error in MEI, if the coordinate system is pointing from
bottom-left to top-right?
Best,
Daniel
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