Precise symbol placement is among the issues that are being
addressed in RFC45 (Symbology, Labeling, and Cartography
Improvements)
<URL: http://mapserver.osgeo.org/development/rfc/ms-rfc-45.html>
In RFC45, a new tag called CENTER or ORIGIN is proposed. ANCHORPOINT
is perhaps a better name for it. This tag could be useful to have
available both with the SYMBOL and with the STYLE.
Cite from RFC45:
CENTER/ORIGIN [x y]
Defines the centre of the symbol using decimal pixels (x axis
increasing to the right, y axis increasing downwards).
* Is used for placing a point symbol on the map or on a “decorated” line
* Defines the centre of rotation if an ANGLE is specified for point symbols.
* Default value is the centre of the symbol’s bounding box.
* Applies to TYPE ellipse, vector, pixmap, truetype.
Håvard Tveite
Bob Basques wrote:
All,
I would vote for both the 0,0 anchoring by default and the use of the
ANCHORPOINT function. These things gave me no end of problems when I first
started out with MapServer. Took a while to figure out how to anchor oddly
shaped symbols for example.
bobb
As a side issue, do the positive/negative numbers have a bearing on the
anchor point of the symbol or is that always in the centre of the symbol?
as of now, the symbol is centered on the anchor point. I'd be in favor
of having a way to specify the anchor point, either by fixing it on
0,0 , or by specifying it alongside the symbol, eg ANCHORPOINT 0.3 2
regards,
thomas
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