#mapnik log: Friday 22, January 2010

2010 | 01

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02:57:31 <calvino.freenode.net> Topic for #mapnik is: Mapnik - C++/Python Toolkit | Mapnik 0.7.0 released
02:57:31 <calvino.freenode.net> Users on #mapnik: mapniklog ajturner @springmeyer jctull chad_burt rcoup mperry dodobas cmarqu mishok13 twain47 Primer crust tomhughes mapnikbuild Simon- racicot CIA-21 avar nikq dukeku hobu ser
03:11:38 <nikq> Mapnik Trac: Ticket #499 (Graceful recovery if postgres connection is lost) created | http://trac.mapnik.org/ticket/499
03:29:13 <nikq> Mapnik Trac: Ticket #477 (semitransparency support for png256) updated | http://trac.mapnik.org/ticket/477#comment:9
03:32:16 <nikq> Mapnik Trac: Changeset [1587]: my first ever commit to a tag - fixup spelling of 0.7.0 release CHANGELOG | http://trac.mapnik.org/changeset/1587
03:36:50 <nikq> Mapnik Trac: Release0.7.0 edited | http://trac.mapnik.org/wiki/Release0.7.0?version=3
03:38:42 <nikq> Mapnik Trac: Ticket #492 (hanging and/or MemoryError thrown if png icon is not found) closed | http://trac.mapnik.org/ticket/492#comment:1
03:40:23 <nikq> Mapnik Trac: Ticket #428 (Polygons and "the problem of adjacent edges") updated | http://trac.mapnik.org/ticket/428#comment:6
03:56:28 <nikq> Mapnik Trac: Ticket #414 (Use Find_SRID in postgis driver) updated | http://trac.mapnik.org/ticket/414#comment:3
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03:58:50 <nikq> Mapnik Trac: Ticket #456 (Expose an option to allow for the PostGIS extent to be calculated upon  ...) updated | http://trac.mapnik.org/ticket/456#comment:4
03:59:00 <nikq> Mapnik Trac: Ticket #260 (Improve flexibility and reliability of PostGIS SQL/Query handling) updated | http://trac.mapnik.org/ticket/260#comment:19
03:59:10 <nikq> Mapnik Trac: Ticket #428 (Polygons and "the problem of adjacent edges") updated | http://trac.mapnik.org/ticket/428#comment:7
03:59:40 <nikq> Mapnik Trac: Ticket #433 (PostGIS connection is not released when datasource is deleted) updated | http://trac.mapnik.org/ticket/433#comment:4
04:00:01 <nikq> Mapnik Trac: Ticket #466 (Catch up on Changelog before 0.7.0 release) updated | http://trac.mapnik.org/ticket/466#comment:5
04:00:11 <nikq> Mapnik Trac: Ticket #485 (TextSymbolizer vertical_align should have varying default) updated | http://trac.mapnik.org/ticket/485#comment:3
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05:01:30 <nikq> Mapnik Trac: Changeset [1588]: fixup CHANGELOG in trunk | http://trac.mapnik.org/changeset/1588
05:03:11 <nikq> Mapnik Trac: Ticket #489 (Sync CHANGELOG in trunk after tagging 0.7.0) closed | http://trac.mapnik.org/ticket/489#comment:2
05:05:08 <springmeyer> fyi all:
05:05:11 <springmeyer> https://lists.berlios.de/pipermail/mapnik-users/2010-January/002856.html
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09:40:52 <myselfhimself> hi !!
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10:25:19 <dodobas> yello
10:27:30 <myselfhimself> hi !!
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12:58:35 <Dominic244> hey guys"
12:59:15 <Dominic244> someone here who has exoerience wit installing mod_tile
13:01:24 <twain47> maybe.  Seems to be the theme of the moment...
13:01:46 <twain47> Dominic244: What's the problem?
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14:34:29 <myselfhimself_> can you kick "myselfhimself" ?
14:34:43 <myselfhimself_> anyway it'll get disconnected
14:34:52 <myselfhimself_> it's a remainder from my ethernet connection
14:35:30 <myselfhimself_> ok anyway
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16:06:18 <myselfhimself> hey
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17:00:01 <drewby> I am in need of the ability to draw offset lines.  I hear there's a patch floating around for that.
17:00:49 <Ldp__> #180
17:00:50 <nikq> Ticket #180: Parameter for line symbolizer to offset line to one side, http://trac.mapnik.org/ticket/180
17:01:26 <drewby> oh haha, I was looking at that, I didn't see tha patch that was attached at the top
17:01:39 <springmeyer> it needs work to be updated to trunk as I did not have the time to work on it's including in 0.7.0 release
17:01:46 <drewby> I continue to make a fool of myself in this chat, either way thanks
17:01:52 <Ldp__> query springmeyer for the current status. I don't know if the patch cleanly applies anymore
17:02:29 <springmeyer> ya, certainly will not apply cleanly to anything recent
17:02:58 <drewby> I'll see if I can do anything
17:03:00 <springmeyer> and I have an additional one that refactors it and added partial support to the LinePatternSymbolizer that I've yet to share
17:03:16 <Ldp__> springmeyer: is it still on track for 0.8 ?
17:03:22 <myselfhimself> How do I render a Mapnik's bbox around a postgres request, into png tiles which have an alpha channel set to opacity=0 for pixels not filled by any layer ?
17:03:26 <springmeyer> certainly Ldp__
17:04:42 <Ldp__> myselfhimself: <Map background="transparent"> for the last part of your question
17:12:31 <myselfhimself> Ldp__: ok thanks
17:13:11 <myselfhimself> Ldp__: being able to obtain a bbox/extent of a pgsql query in a Layer's datasource is a feature from 0.7 I think
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17:13:18 <myselfhimself> like !bbox!
17:13:21 <myselfhimself> I'll find that
17:13:34 <Ldp__> the bbox is always applied to the query, even in earlier versions
17:13:36 <myselfhimself> is this !bbox! feature also already in mapnik 0.8 ?
17:13:39 <myselfhimself> Ldp__: ok
17:13:58 <Ldp__> myselfhimself: see the 2nd box on http://trac.mapnik.org/wiki/OptimizeRenderingWithPostGIS
17:20:04 <springmeyer> myselfhimself: you will not need to care about using !bbox!, that is only for custom placement if very unique queries
17:20:10 <springmeyer> if/in
17:20:29 <myselfhimself> springmeyer: ok
17:20:40 <myselfhimself> Ldp__: ok I've just read the full page thanks
17:20:44 <myselfhimself> springmeyer: thanks
17:21:12 <Ldp__> there are some new tricks, like the !bbox! you mentioned, that would deserve a spot on that page
17:21:55 <myselfhimself> ok
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17:26:16 <myselfhimself> with mapnik's cpp library (I mean from mod_tile), is that possibly to 1) open an osm.xml file, 2) disable "online" some layers and enable others, 3) run a tile rendering for a specific tile/small bbox ?
17:27:40 <Ldp__> didn't you ask 2) yesterday already, or was that someone else?
17:28:02 <myselfhimself> Ldp__: maybe that was Micka
17:28:04 <Ldp__> if it's not possible, you can open an enhancement ticket
17:28:08 <myselfhimself> ok
17:28:12 <myselfhimself> I have to read the api..
17:28:17 <myselfhimself> api reference
17:28:23 <myselfhimself> Micka is another team member
17:28:38 <myselfhimself> I've been asking questions around this topic anyway today
17:28:39 <Ldp__> 3) you always have to tell mapnik which bbox you want to render
17:29:07 <Ldp__> 1) of course
17:30:08 <myselfhimself> for 2) instead of enabling disabling/layers, I would want instead to rewrite a layer (eg. name="LayerToGetAParticularLevelChangeMyPGSQL")'s pgsql code to filter a specific level
17:30:39 <myselfhimself> that's better for me than generating osmlevel1.xml, osmlevel2.xml etc...
17:30:59 <Ldp__> level=zoom?
17:31:07 <Ldp__> or building level?
17:31:09 <myselfhimself> no level is a floor
17:31:11 <myselfhimself> yes building level
17:31:48 <myselfhimself> for floor / level, the objects to render are different and are filtered by tag level=N, where N is a determined integer
17:31:53 <Ldp__> if you have a level column in your postgis input, what's the problem?
17:32:38 <myselfhimself> there's no problem...
17:32:44 <Ldp__> you're not mapping the Petronas Towers or Burj al-Dubai yet, I presume. How many levels will you handle
17:32:46 <myselfhimself> I can do the pgsql filtering correctly
17:32:59 <myselfhimself> 2 levels (for a prototype for next thursday/friday)
17:33:20 <myselfhimself> I'll have to hack mod_tile...
17:33:22 <Ldp__> so have 2 sets of rules, and filter on level
17:33:30 <myselfhimself> yes
17:33:52 <myselfhimself> 2 sets of rules... or one DataSource code that gets customized online ?
17:34:00 <Ldp__> either way
17:34:23 <Ldp__> I think you can load an XML through the API, and then add more styles/rules/layers on top of that
17:34:34 <Ldp__> but I'm no API expert, springmeyer is
17:34:54 <myselfhimself> yes
17:35:05 <myselfhimself> I'll make an effort and read that api
17:35:06 <Ldp__> so have a base XML, and add the custom stuff at runtime
17:35:15 <myselfhimself> yes that's what's best
17:35:47 <myselfhimself> then I have to design something, an interface between mod_tile and mapnik
17:36:34 <Ldp__> you can talk directly to renderd from your own code, too
17:36:48 <Ldp__> but yeah, renderd will have loaded an XML already
17:36:49 <nikq> Mapnik Trac: LinuxInstallation edited | http://trac.mapnik.org/wiki/LinuxInstallation?version=10
17:37:30 <Ldp__> don't know why you don't write your own code. Seems very hard to do in mod_tile, without extensive customizations
17:38:31 * springmeyer agrees
17:38:38 * myselfhimself : )
17:38:54 <springmeyer> likes like a web application that should be written on top of mapnik python api
17:38:58 <myselfhimself> or I can hack tilecache or tilelite
17:39:07 <springmeyer> no
17:39:18 <springmeyer> both has very specific ideas of request handling
17:39:34 <springmeyer> and intentionally don't look for arbitrary styles to be applied
17:39:57 <springmeyer> because that is much easier handled by your own code to do request handling
17:40:14 <myselfhimself> ok but I want to do caching as well
17:40:19 <myselfhimself> this would spare me that
17:40:39 <springmeyer> caching is pretty simple
17:40:47 <springmeyer> worry about that later
17:42:36 <myselfhimself> at least I'll need style caching, so that I'm not generating level1's style again before rendering upon each level1/somepng.png request
17:43:33 <Ldp__> seems like you're thinking of different branches in the styles, which is an interesting concept
17:46:28 <myselfhimself> the postgresql queries could have dynamic variables like select * from tables where value=[variableIcanSetAsAparameterByMapnikComplementedAPI]
17:49:06 <myselfhimself> and I could style = mapnik.openStyle("osm.xml), level1Style=mapnik.customizeStyle(style,{"variableIcanSetAs...":1})... then myTileLevel1 = mapnik.render(level1Style,bbox)
17:49:41 <myselfhimself> this could be a stupid as C #define doing full find & replace
17:50:45 <drewby> springmeyer, the offset code works like a charm
17:50:55 <drewby> now if only all my roads were pointing in the same direction
17:51:17 <springmeyer> drewby: that is charming, which svn r did you apply to?
17:51:21 <myselfhimself> mapnik uses sax so the api I'm imagining is not easy to implement and should have another form
17:51:43 <drewby> springmeyer: 7.0 release
17:52:01 <springmeyer> ah, well that is a miracle, great
17:52:28 <drewby> springmeyer: I just went through the patch and applied it by hand, it took all of 10 minutes
17:52:35 <springmeyer> the funding for that project kind of ran out abruptly, so glad it works for you
17:52:37 <springmeyer> ah, I see
17:53:08 <Ldp__> may I suggest making a new diff and attaching it to #180? :)
17:53:08 <nikq> Ticket #180: Parameter for line symbolizer to offset line to one side, http://trac.mapnik.org/ticket/180
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18:29:50 <drewby> I can't figure out how to do a diff to send you guys the patch ^^.
18:41:37 <drewby> how to keep it from exploding on sharp angles
18:41:44 <drewby> my postgis function did that too
18:42:41 <springmeyer> hey drewby
18:42:47 <drewby> yeah
18:42:53 <springmeyer> I gather you did not check out from svn?
18:43:10 <drewby> I did
18:43:15 <springmeyer> if not, you can download a fresh 0.7.0 copy..
18:43:16 <springmeyer> oh
18:43:20 <springmeyer> $ svn diff
18:43:20 <springmeyer> ?
18:43:33 <springmeyer> svn diff > your.patch
18:44:30 <drewby> and then attach it to the ticket in trac?
18:44:39 <springmeyer> yes, exactly
18:44:56 <springmeyer> ideally do that command from the base source directory, not a subdirectory
18:46:14 <drewby> I don't think I have the power to comment on tickets
18:46:31 <springmeyer> you should, just have to be logged in
18:46:56 <drewby> oh. needed to refresh
18:46:59 <springmeyer> if its a hassle for you just http://dpaste.com the patch
18:47:01 <springmeyer> ah
18:47:55 <springmeyer> re: "exploding on sharp angles" yes it does not make an attempt to handle blown out offsets
18:48:23 <nikq> Mapnik Trac: offset-0.7.0.patch attached to Ticket #180 | http://trac.mapnik.org/attachment/ticket/180/offset-0.7.0.patch
18:48:29 <springmeyer> I tested the offset functionality in ArcGIS and it also suffered from that problem
18:48:31 <springmeyer> so I figured that could be a later phase item
18:50:02 <drewby> my indenting is screwy or something
18:50:23 <springmeyer> no worries
18:50:50 <drewby> I'm gonna work on the exploding issue
18:50:55 <springmeyer> could be a tabs vs. spaces issue
18:51:01 <springmeyer> drewby: thats awesome
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18:52:21 <springmeyer> hey jctull
18:52:34 <jctull> springmeyer: hi
18:53:00 <springmeyer> I recall your noticing issues in QGIS with display over overlapping dashed lines
18:53:25 <jctull> yes
18:54:22 <springmeyer> not sure if you've tried this.... painting a thin line underneath in the same color as the map background?
18:54:34 <springmeyer> solid thin that is, below the dashed lines
18:55:04 <springmeyer> I did some quick testing and it seems to work decently in Mapnik
18:55:05 <jctull> usually my maps have enough complexity in the base layers that that probably would not work too well
18:55:19 <jctull> I often use topo maps as base information
18:55:20 <springmeyer> ah, good point
18:55:23 <jctull> and hillshades
18:56:13 <jctull> it's a complex problem, I guess, b/c the renderer would have to check for common polygon boundaries in multipolygons and only render those once
18:56:19 <springmeyer> so for that case you'd really need to enforce that the dashed line is only drawn once, or have it be an "erasing stroke" effect
18:56:23 <springmeyer> yep
18:56:40 <springmeyer> or the datatype would have to be topological
18:56:48 <springmeyer> so the renderer truly would only draw one line
18:56:58 <springmeyer> would would be ideal for performance too
18:57:50 <springmeyer> well, my fiddling with the simple use case (which won't work for you) is now in Quantumnik 0.3.1....
18:58:35 <springmeyer> I added it at the same time as adding a fix for keeping the seamless look between polygons
18:58:46 <springmeyer> which was the original issue that got us chatting about this I think
18:59:00 <springmeyer> when it turned out we were thinking about different things :)
18:59:03 <jctull> that's progress, right?
18:59:47 <springmeyer> ya, for sharp/crisp looking stylistic maps with intentionally non-complex colors and lines
18:59:56 <springmeyer> it solves the problem
19:00:03 <jctull> that's good
19:03:32 <springmeyer> although, in my testing I screwed up once and painted a solid color line underneath a dash line that was different that the background of the map
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19:04:14 <springmeyer> and it actually can bring out the dashes nicely, but at that point its in the eye of the beholder of course...
19:04:41 <jctull> So, if you have a common boundary issue, how will this help?
19:05:06 <jctull> The common boundary will be rendered on top of the line beneath, so it will still overdraw itself, right?>
19:05:38 <jctull> I will have to mess around with it and see what it looks like
19:06:30 <springmeyer> not in Mapnik (and I assume in Symbology-ng)...
19:06:55 <springmeyer> it works because the line drawing order goes....
19:07:27 <springmeyer> draw feature (draw solid line, draw dashed line), draw next features (draw solid line...
19:12:37 <springmeyer> jctull: http://dbsgeo.com/tmp/dash_underlay_approach.png
19:13:31 <springmeyer> there is some slight distortion on strait lines but overall its close to the mark i think.
19:13:46 <jctull> I see, using symbology ng with multiple patterns/lines, not duplicate map layers
19:13:55 <springmeyer> exactly
19:14:01 <jctull> hey, you even got my state in the middle ;)
19:14:18 <springmeyer> I centered on burning man
19:14:19 <jctull> I will play with that approach. It would still be a big improvement!
19:14:23 <springmeyer> jk
19:14:24 <jctull> good thinking
19:14:32 <jctull> heh
19:14:47 <jctull> you need to go a little north and west, but you're close
19:15:04 <springmeyer> lets just say that your state looks a like nicer that say the border of Idaho
19:15:31 <springmeyer> for that to look good dashed we'd ne on-the-fly line bezier smoothing
19:16:45 <jctull> get to work ;)
19:17:43 <springmeyer> ha, its already implemented, just needs testing :)
19:17:47 <springmeyer> #332
19:17:47 <nikq> Ticket #332: Rendering curved paths, http://trac.mapnik.org/ticket/332
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19:22:37 <jctull> nice
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20:10:09 <drewby> hahaha, the mapserver sources are ummm....
20:10:34 <drewby> interesting
20:10:35 <springmeyer> huh?
20:10:46 <springmeyer> wrong window? ;)
20:11:14 <drewby> actually I'm'a see how mapserver does offsets cause it works pretty well in mapserver
20:11:22 <drewby> I just can't keep writing mapfiles
20:11:36 <drewby> they get to be thousands of lines of 90% duplicate code
20:11:47 <springmeyer> ah, thats why you are looking, gocha
20:13:29 * springmeyer didn't think mapserver supported anything but simple x,y coordinate offsets...
20:13:36 <springmeyer> eg. shifts
20:13:57 <drewby> no, they have along-line offset
20:14:37 <springmeyer> nice
20:15:30 * springmeyer did search around before starting to code that initial patch and found literally nothing out there
20:15:51 <springmeyer> guess I didn't look hard
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20:16:26 <drewby> it's poorly documented but if you set the why offset to -99 it swtiches to following along the line
20:16:41 <springmeyer> lol
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20:17:32 <springmeyer> by that you mean beside the line?
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20:19:25 <drewby> yeah
20:19:45 <drewby> and I mean y offset not the why offset, darn autocorrect
20:20:20 <springmeyer> :)
20:20:44 <springmeyer> maybe in mapnik we should use that keyword  why=1, ex=-1 :)
20:20:52 <springmeyer> secret feature!
20:22:09 <drewby> hahaha
21:02:58 <myselfhimself> see you thanks for all
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21:18:42 <springmeyer> cmarqu: have you ever noticed that microsoft's map's have very soft, glowing text halos?
21:19:07 <springmeyer> curious if you've ever gotten/tried that amount of glow with mapnik...
21:20:28 <springmeyer> http://ecn.t7.tiles.virtualearth.net/tiles/r02123002133.png?g=401&mkt=en-us&shading=hill&n=z
21:20:30 <nikq> Mapnik Trac: Ticket #500 (Fix PostGIS datasource's schema support) created | http://trac.mapnik.org/ticket/500
21:21:21 <nikq> Mapnik Trac: mapnik-postgis.patch attached to Ticket #500 | http://trac.mapnik.org/attachment/ticket/500/mapnik-postgis.patch
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21:38:31 <nikq> Mapnik Trac: Ticket #500 (Fix PostGIS datasource's schema support) updated | http://trac.mapnik.org/ticket/500#comment:1
21:48:09 <nikq> Mapnik Trac: Ticket #500 (Fix PostGIS datasource's schema support) updated | http://trac.mapnik.org/ticket/500#comment:2
21:50:00 <nikq> Mapnik Trac: Ticket #500 (Fix PostGIS datasource's schema support) updated | http://trac.mapnik.org/ticket/500#comment:3
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22:23:18 <nikq> Mapnik Trac: Ticket #500 (Fix PostGIS datasource's schema support) updated | http://trac.mapnik.org/ticket/500#comment:4
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