The patch adds a new style function called garmin_area().
garmin_area() returns the size of an area in garmin-units ^2. It works for polygons only. Unclosed ways return 0.

Please test it and let me know:
* Do you have a better name?
* What to do with multipolygons? Should garmin_area() return the multipolygon size for all splitted parts of the mp? or: Should it be possible to use garmin_area() in the relations file? In this case it would be possible to add tags to all members which can then be used in the polygons file.
Example:
type=multipolygon & building=yes & garmin_area() > 20000
{ apply
  {
    set mkgmap:bigbuilding=yes;
  }
}

Have fun!
WanMil

Attachment: garmin_area_v1.patch
Description: application/download

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