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<p>Hi Ticker,</p>
<p><br>
</p>
<p>mkgmap analyses multipolygon relations and cuts inner parts, so correct mp-relations</p>
<p>should not be a problem. I've seen overlapping polygons, e.g. when you chose to render</p>
<p>place=island and also the land polygons created by the sea generator. <br>
</p>
<p>You suggest to write the larger polygon first, but in those cases this would not help.</p>
<p>I think this solution would also not help when polygons partially overlap.<br>
</p>
<p><br>
</p>
<p>Gerd<br>
</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Von:</b> mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap@jagit.co.uk><br>
<b>Gesendet:</b> Samstag, 23. Juli 2016 20:42:02<br>
<b>An:</b> mkgmap-dev@lists.mkgmap.org.uk<br>
<b>Betreff:</b> Re: [mkgmap-dev] Option to output polygons in size order</font>
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<div class="PlainText">Hi<br>
<br>
I'm sure that the order in the map has some effect on the Legend; as I<br>
zoom in or scroll across areas with greenery they appear briefly and<br>
are then cleared, by the island polygon that covers everything, as it<br>
starts drawing the ways...<br>
<br>
Generally, the openStreetMap data order is OK, but I have found<br>
examples where there are lakes, within the same meadow, that occur both<br>
before and after it. Not sure if this is related to multi-polygons, but<br>
if sorting was performed on the individual polygons there wouldn't be<br>
any problem.<br>
<br>
Also it looks like splitter is delaying the British Isles (and other<br>
large) polygons because they occurs on multiple tiles.<br>
<br>
Typ _drawOrder cannot solve the problem when there are nested polygons<br>
with more that one instance of the same type, whereas drawing outer<br>
ones first solves it completely.<br>
<br>
I have seen mention somewhere that areas with the same _draworder are<br>
rendered in file order<br>
<br>
Ticker<br>
<br>
On Sat, 2016-07-23 at 17:17 +0000, Gary Bamford wrote:<br>
> Hi Ticker/Gerd<br>
> <br>
> The draw order does work for the Legend ( it is the device I have ).<br>
> I also came across problems with multiple polygons, the problem can<br>
> be one of several things, not all multi polygons are correct on<br>
> openstreetmap, I cam across one today "fairhaven lake" golf course,<br>
> was hiding, due to draw order, but the problem was, it is contained<br>
> within a polygon for a residential area, so I had to change the data<br>
> on openstreetmap, to make it an inner polygon. when i download the<br>
> new OSM data I expect it to work correctly.<br>
> <br>
> if the polygons are set correctly on openstreetmap, then draw order<br>
> will will as you expect. <br>
> <br>
> Gary<br>
> <br>
> From: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> on behalf<br>
> of Gerd Petermann <GPetermann_muenchen@hotmail.com><br>
> Sent: 23 July 2016 17:05<br>
> To: Development list for mkgmap<br>
> Subject: Re: [mkgmap-dev] Option to output polygons in size order<br>
> <br>
> Hi Ticker,<br>
> <br>
> are you sure that the order matters? I've never heard that theory<br>
> and I would be surprised when that is true.<br>
> The normal way to handle the draw order is to use a typ file, not<br>
> sure<br>
> if this works on your device, but it seems to work well for others.<br>
> <br>
> Gerd<br>
> Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag<br>
> von Ticker Berkin <rwb-mkgmap@jagit.co.uk><br>
> Gesendet: Samstag, 23. Juli 2016 18:45:59<br>
> An: mkgmap development<br>
> Betreff: [mkgmap-dev] Option to output polygons in size order<br>
> <br>
> Hi<br>
> <br>
> I'm using splitter-r437/mkgmap-r3676 to make a map for Etrex Legend<br>
> from british-isles-latest.osm.pbf from geofabric.de.<br>
> <br>
> Using "default" style and not using a TYP file, no land features<br>
> (woods,marsh,green) show because an island polygon for "British<br>
> Isles"<br>
> is rendered near the end, on top of everything else. I guess that the<br>
> Etrex has all area types as the same draworder and renders them in<br>
> file<br>
> order.<br>
> <br>
> I presume I could use TYP / _DrawOrder to change this behaviour<br>
> slightly but I keep finding examples of woods in islands in lakes in<br>
> marsh in islands etc etc, so _DrawOrder can't solve the problem.<br>
> <br>
> What would make everything show correctly would be to output polygons<br>
> in size order, largest to smallest. Could this be done easily? either<br>
> in splitter then --preserve-element-order, or in mkgmap, possibly<br>
> after<br>
> style processing because there will be a lot fewer polygons at this<br>
> point.<br>
> <br>
> Regards<br>
> Ticker Berkin<br>
> <br>
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