[mkgmap-dev] Can you set background colour in a TYP file?From Adrian ar2988-os at yahoo.co.uk on Sat Jan 30 21:00:59 GMT 2010
I believe I have a solution for this. The default background colour of a Garmin map is yellow. You would expect to be able to change this by setting the colour of polygon type 0x4b, using a .TYP file. But some Garmin devices refuse to change the background colour. I have done some tests with an etrex Legend HCx, and in addtion to type 0x4b, you cannot change the colour of 0x27, 0x31, 0x52 and 0x010100. (All of these, except 0x52, can be changed in RoadTrip.) But you _can_ change the colour of type 0x010100 on the etrex if you specify it with a bitmap! You can have all pixels the same colour in the bitmap, and you can have different colours for day and night. This is the solution used by the creator of openmtbmap, although he did not explain it. [You always have to list two colours for the bitmap. The openmtbmap bitmaps contain one pixel of the second colour. Perhaps his .TYP compiler insisted that both colours must be used.] This trick does not work with polygon type 0x4b. If you are using --generate-sea=no-mp [as in openmtbmap], you can use type 0x010100 for your land polygons and the problem is solved. I have just learned from "[mkgmap-dev] Commit: r1524: Let the background polygon (type 0x4b) cover the whole map area" that mkgmap draws background polygons of type 0x4b automatically. So we are very close to a solution for those who are not using --generate-sea or who are using --generate-sea=multipolygon. Therefore I have a suggestion - to have an option in mkgmap, either on the command line or as a style rule, for the user to choose the type of the background polygons.
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