Updated MapnikViewer (markdown)
springmeyer
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MapnikViewer.md
117
MapnikViewer.md
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<!-- Name: MapnikViewer -->
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<!-- Version: 21 -->
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<!-- Last-Modified: 2011/02/07 21:46:12 -->
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<!-- Author: springmeyer -->
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The Mapnik Viewer is a GUI tool for rendering and viewing maps based on Mapnik XML mapfiles.
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It's available under https://github.com/mapnik/mapnik/tree/master/demo/viewer and needs to be compiled after manually modifying the build settings.
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It's available in the `demo/viewer` folder of your mapnik source code. It is not compiled by default, but can be built separately after installing Mapnik.
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----
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[[/images/mapnik_viewer.png]]
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----
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## A Desktop XML Viewer
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1. View tile images on-the-fly.
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2. Debug information on bad config files, points to the erroneous line.
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3. Shows scale and envelope for current view.
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4. Fast zooming and point-based attribute queries.
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5. Export to a variety of formats including tif.
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## Requirements
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* A working Mapnik installation
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@ -27,87 +13,30 @@ It's available under https://github.com/mapnik/mapnik/tree/master/demo/viewer an
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* Qt4 including dev files (for example, see [Qt/Mac Open Source Edition](http://trolltech.com/developer/downloads/qt/mac))
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* Qmake
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## Compiling
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## Building
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1. Modify [viewer.pro](https://github.com/mapnik/mapnik/blob/master/demo/viewer/viewer.pro) to match your system include and lib directories for boost, your mapnik build, unicode, and freetype.
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* Most default installs put the mapnik libs and includes in `usr/local`, thus requiring an include like:
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```sh
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INCLUDEPATH += /usr/local/include/mapnik
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```
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NOTE: these instructions assume you are using Mapnik >= 2.1. Mapnik 2.1 source code includes a `viewer.pro` file that will leverage the `mapnik-config` to get the proper build settings from your Mapnik install.
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* And a lib like:
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```sh
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unix:LIBS += -L/usr/local/lib -lmapnik
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```
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* And to link boost, freetype, and unicode from macports on Mac 10.5, for example, would require:
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```sh
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INCLUDEPATH += /opt/local/include/boost-1_35
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INCLUDEPATH += /opt/local/include/unicode
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INCLUDEPATH += /opt/local/include/freetype2
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INCLUDEPATH += /opt/local/include
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unix:LIBS += -L/opt/local/lib -lfreetype
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```
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* Since Ubuntu 10.04 those settings are enough:
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Run Qmake to generate a makefile:
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```sh
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QMAKE_CXXFLAGS +=' -ansi'
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INCLUDEPATH += /usr/include/freetype2
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LIBS += -lmapnik
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cd ./demo/viewer
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qmake -makefile
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```
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* A patch for Mac OS 10.5 is [attachment:wiki:MapnikViewer:viewer.patch viewable here], and [downloadable here](http://trac.mapnik.org/raw-attachment/wiki/MapnikViewer/viewer.patch)
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2. Modify main.cpp by setting the correct paths to Mapnik's plug-ins and fonts directories
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* https://github.com/mapnik/mapnik/blob/master/demo/viewer/main.cpp#L46
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* On most systems these lines should point to`/usr/local/lib/mapnik/`
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```sh
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datasource_cache::instance()->register_datasources("/usr/local/lib/mapnik/input");
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freetype_engine::register_font("/usr/local/lib/mapnik/fonts/DejaVuSans.ttf");
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freetype_engine::register_font("/usr/local/lib/mapnik/fonts/DejaVuSans-Bold.ttf");
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freetype_engine::register_font("/usr/local/lib/mapnik/fonts/DejaVuSansMono.ttf");
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```
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3. Then run Qmake to generate a makefile
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On Mac OSX the above command may generate an XCode project. To generate a normal Makefile do:
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```sh
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cd mapnik-svn-tree/demo/viewer
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qmake -makefile
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qmake -spec macx-g++
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```
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On Mac OSX the above will generate an Xcodeproject. To generate a normal Makefile do:
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Finally, run Make to build the *viewer.app* or *viewer.exe*
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```sh
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qmake -spec macx-g++
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make
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```
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4. Finally, run Make to build the *viewer.app* or *viewer.exe*
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```sh
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make
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```
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(On OS X, you may need to instead run "open viewer.xcodeproj" to open the project in Apple's XCode environment.)
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* Your make output should be something like:
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```sh
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$ make
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make -f Makefile.Release
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/opt/local/bin/uic forms/about.ui -o ui_about.h
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/opt/local/bin/uic forms/info.ui -o ui_info.h
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/opt/local/bin/uic forms/layer_info.ui -o ui_layer_info.h
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c++ -c -pipe -DDARWIN -Os -Wall -W -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/opt/local/share/qt4/mkspecs/macx-g++ -I. -I/opt/local/include/qt4/QtCore -I/opt/local/include/qt4/QtCore -I/opt/local/include/qt4/QtGui -I/opt/local/include/qt4/QtGui -I/opt/local/include/qt4 -I/usr/local/include/mapnik -I/opt/local/include/boost-1_35 -I/opt/local/include/unicode -I/opt/local/include -I/opt/local/include/freetype2 -I. -Irelease -I. -o release/main.o main.cpp
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[...]
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```
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* If it fails you need to go back to the viewer.pro and set more lib and include paths
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* A successful build will output the ready to run graphical program in that directory.
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On OS X, if a viewer.xcodeproj was built then open the project in Apple's XCode environment and hit "build and run"
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## Usage
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@ -120,12 +49,12 @@ Double click on the resulting application (viewer.app on Mac OS)
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You can also load your XML files when launching the viewer from a terminal:
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```sh
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# On linux this would look like:
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# ./viewer /path/to/your.xml
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# On mac this would look like:
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$ ./viewer.app/Contents/MacOS/viewer /path/to/your.xml
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# or
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$ open -a viewer
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# On linux this would look like:
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./viewer /path/to/your.xml
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# On mac this would look like:
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./viewer.app/Contents/MacOS/viewer /path/to/your.xml
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# or
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open -a viewer
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```
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or
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@ -133,15 +62,3 @@ or
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```sh
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# ./viewer your.xml -1,50,1,52
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```
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or
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```sh
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# ./viewer # (open your.xml from file menu)
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```
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## Further Reading
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Related mailing list discussions:
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* https://lists.berlios.de/pipermail/mapnik-devel/2008-February/000501.html
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