[QGIS Commit] r9589 - in trunk/code_examples: .
1_hello_world_qgis_style 1_hello_world_qgis_style/cmake_find_rules
svn_qgis at osgeo.org
svn_qgis at osgeo.org
Sat Nov 8 05:47:50 EST 2008
Author: timlinux
Date: 2008-11-08 05:47:50 -0500 (Sat, 08 Nov 2008)
New Revision: 9589
Added:
trunk/code_examples/1_hello_world_qgis_style/
trunk/code_examples/1_hello_world_qgis_style/CMakeLists.txt
trunk/code_examples/1_hello_world_qgis_style/COPYING
trunk/code_examples/1_hello_world_qgis_style/README
trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/
trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGDAL.cmake
trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGEOS.cmake
trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindQGIS.cmake
trunk/code_examples/1_hello_world_qgis_style/main.cpp
trunk/code_examples/1_hello_world_qgis_style/tutorial1.html
Log:
Added tutorial 1 as a cmake project and updated it for QGIS 1.0 API
Added: trunk/code_examples/1_hello_world_qgis_style/CMakeLists.txt
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/CMakeLists.txt (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/CMakeLists.txt 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,113 @@
+PROJECT(timtut1)
+SET(CMAKE_COLOR_MAKEFILE ON)
+# set path to additional CMake modules
+SET(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake_find_rules ${CMAKE_MODULE_PATH})
+FIND_PACKAGE(QGIS REQUIRED)
+IF (NOT QGIS_FOUND)
+ MESSAGE (SEND_ERROR "QGIS dependency was not found!")
+ENDIF (NOT QGIS_FOUND)
+IF (WIN32)
+ # expect that classes are being imported by default
+ # Note: MSVC doesn't like when the macros are quotes
+ # and MSYS doesn't like them unqouted (bacause of braces)
+ # import qgis classes
+ IF (MSVC)
+ ADD_DEFINITIONS("-DGUI_EXPORT=__declspec(dllimport)")
+ ADD_DEFINITIONS("-DCORE_EXPORT=__declspec(dllimport)")
+ ELSE (MSVC)
+ ADD_DEFINITIONS("\"-DGUI_EXPORT=__declspec(dllimport)\"")
+ ADD_DEFINITIONS("\"-DCORE_EXPORT=__declspec(dllimport)\"")
+ ENDIF (MSVC)
+ELSE (WIN32)
+ ADD_DEFINITIONS(-DGUI_EXPORT=)
+ ADD_DEFINITIONS(-DCORE_EXPORT=)
+ENDIF (WIN32)
+
+FIND_PACKAGE(GDAL REQUIRED)
+IF (NOT GDAL_FOUND)
+ MESSAGE (SEND_ERROR "GDAL dependency was not found!")
+ENDIF (NOT GDAL_FOUND)
+
+FIND_PACKAGE(GEOS REQUIRED)
+IF (NOT GEOS_FOUND)
+ MESSAGE (SEND_ERROR "GEOS dependency was not found!")
+ENDIF (NOT GEOS_FOUND)
+
+IF (CMAKE_BUILD_TYPE MATCHES Debug)
+ ADD_DEFINITIONS(-Dtimtut1DEBUG=1)
+ENDIF (CMAKE_BUILD_TYPE MATCHES Debug)
+########################################################
+# Files
+
+SET (timtut1_SRCS
+ main.cpp
+)
+
+# This tut uses no UIs
+SET (timtut1_UIS
+)
+
+# This tut needs no MOC
+SET (timtut1_MOC_HDRS
+)
+
+# This tut uses no resource files
+SET (timtut1_RCCS
+
+)
+
+SET (QT_USE_QT3SUPPORT FALSE)
+SET (QT_USE_QTGUI TRUE)
+SET (QT_USE_QTSQL TRUE)
+SET (QT_USE_QTSVG TRUE)
+SET (QT_USE_QTXML TRUE)
+SET (QT_USE_QTNETWORK TRUE)
+FIND_PACKAGE(Qt4 REQUIRED)
+INCLUDE( ${QT_USE_FILE} )
+########################################################
+# Build
+
+QT4_WRAP_UI (timtut1_UIS_H ${timtut1_UIS})
+
+QT4_WRAP_CPP (timtut1_MOC_SRCS ${timtut1_MOC_HDRS})
+
+QT4_ADD_RESOURCES(timtut1_RCC_SRCS ${timtut1_RCCS})
+
+ADD_EXECUTABLE (timtut1 MODULE ${timtut1_SRCS} ${timtut1_MOC_SRCS} ${timtut1_RCC_SRCS} ${timtut1_UIS_H})
+
+INCLUDE_DIRECTORIES(
+ ${GDAL_INCLUDE_DIR}
+ ${GEOS_INCLUDE_DIR}
+ ${CMAKE_CURRENT_BINARY_DIR}
+ ${QT_INCLUDE_DIR}
+ ${QGIS_INCLUDE_DIR}
+ .
+)
+
+#This is probably no longer needed, but I will leave it in for Win machines for the moment
+IF(QT_QTSQL_FOUND)
+ FIND_LIBRARY(QT_QTSQL_LIBRARY NAMES QtSql QtSql4 PATHS ${QT_LIBRARY_DIR} NO_DEFAULT_PATH)
+ SET(QT_LIBRARIES ${QT_LIBRARIES} ${QT_QTSQL_LIBRARY})
+ENDIF(QT_QTSQL_FOUND)
+
+TARGET_LINK_LIBRARIES(timtut1
+ ${QT_LIBRARIES}
+ ${QGIS_CORE_LIBRARY}
+ ${QGIS_GUI_LIBRARY}
+ ${GEOS_LIBRARY}
+
+ ${GDAL_LIBRARY}
+)
+
+IF (MSVC)
+ # Very important or you get all kinds of odd side
+ #effects like app crash on start up saying qtgui.dll
+ TARGET_LINK_LIBRARIES( timtut1
+ qtmain
+ )
+ENDIF (MSVC)
+
+########################################################
+# Install
+
+
Added: trunk/code_examples/1_hello_world_qgis_style/COPYING
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/COPYING (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/COPYING 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,353 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
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+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
Added: trunk/code_examples/1_hello_world_qgis_style/README
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/README (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/README 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,3 @@
+This tutorial is copyright Tim Sutton, 2006, 2008.
+
+This work is licensed under the GPL version 2 - see COPYING file for more details.
Added: trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGDAL.cmake
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGDAL.cmake (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGDAL.cmake 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,129 @@
+## Once run this will define:
+##
+## GDAL_FOUND = system has GDAL lib
+##
+## GDAL_LIBRARY = full path to the library
+##
+## GDAL_INCLUDE_DIR = where to find headers
+##
+## Magnus Homann
+
+
+IF(WIN32)
+
+ IF (MINGW)
+ FIND_PATH(GDAL_INCLUDE_DIR gdal.h /usr/local/include /usr/include c:/msys/local/include)
+ FIND_LIBRARY(GDAL_LIBRARY NAMES gdal PATHS /usr/local/lib /usr/lib c:/msys/local/lib)
+ ENDIF (MINGW)
+
+ IF (MSVC)
+ FIND_PATH(GDAL_INCLUDE_DIR gdal.h
+ "$ENV{LIB_DIR}/include/gdal"
+ )
+ FIND_LIBRARY(GDAL_LIBRARY NAMES gdal PATHS
+ "$ENV{LIB_DIR}/lib/"
+ )
+
+ # NOTE: under msvc you should add the following to your target link libraries
+ # list as they are required by gdal
+ #odbc32 odbccp32
+
+ ENDIF (MSVC)
+
+
+ELSE(WIN32)
+ IF(UNIX)
+
+ # try to use framework on mac
+ IF (APPLE)
+ SET (GDAL_MAC_PATH /Library/Frameworks/GDAL.framework/unix/bin)
+ ENDIF (APPLE)
+
+ SET(GDAL_CONFIG_PREFER_PATH "$ENV{GDAL_HOME}/bin" CACHE STRING "preferred path to GDAL (gdal-config)")
+ FIND_PROGRAM(GDAL_CONFIG gdal-config
+ ${GDAL_CONFIG_PREFER_PATH}
+ ${GDAL_MAC_PATH}
+ /usr/local/bin/
+ /usr/bin/
+ )
+ # MESSAGE("DBG GDAL_CONFIG ${GDAL_CONFIG}")
+
+ IF (GDAL_CONFIG)
+ # set INCLUDE_DIR to prefix+include
+ EXEC_PROGRAM(${GDAL_CONFIG}
+ ARGS --prefix
+ OUTPUT_VARIABLE GDAL_PREFIX)
+ #SET(GDAL_INCLUDE_DIR ${GDAL_PREFIX}/include CACHE STRING INTERNAL)
+ FIND_PATH(GDAL_INCLUDE_DIR
+ gdal.h
+ ${GDAL_PREFIX}/include/gdal
+ ${GDAL_PREFIX}/include
+ /usr/local/include
+ /usr/include
+ )
+
+ ## extract link dirs for rpath
+ EXEC_PROGRAM(${GDAL_CONFIG}
+ ARGS --libs
+ OUTPUT_VARIABLE GDAL_CONFIG_LIBS )
+
+ ## split off the link dirs (for rpath)
+ ## use regular expression to match wildcard equivalent "-L*<endchar>"
+ ## with <endchar> is a space or a semicolon
+ STRING(REGEX MATCHALL "[-][L]([^ ;])+"
+ GDAL_LINK_DIRECTORIES_WITH_PREFIX
+ "${GDAL_CONFIG_LIBS}" )
+ # MESSAGE("DBG GDAL_LINK_DIRECTORIES_WITH_PREFIX=${GDAL_LINK_DIRECTORIES_WITH_PREFIX}")
+
+ ## remove prefix -L because we need the pure directory for LINK_DIRECTORIES
+
+ IF (GDAL_LINK_DIRECTORIES_WITH_PREFIX)
+ STRING(REGEX REPLACE "[-][L]" "" GDAL_LINK_DIRECTORIES ${GDAL_LINK_DIRECTORIES_WITH_PREFIX} )
+ ENDIF (GDAL_LINK_DIRECTORIES_WITH_PREFIX)
+
+ ## split off the name
+ ## use regular expression to match wildcard equivalent "-l*<endchar>"
+ ## with <endchar> is a space or a semicolon
+ STRING(REGEX MATCHALL "[-][l]([^ ;])+"
+ GDAL_LIB_NAME_WITH_PREFIX
+ "${GDAL_CONFIG_LIBS}" )
+ # MESSAGE("DBG GDAL_LIB_NAME_WITH_PREFIX=${GDAL_LIB_NAME_WITH_PREFIX}")
+
+
+ ## remove prefix -l because we need the pure name
+
+ IF (GDAL_LIB_NAME_WITH_PREFIX)
+ STRING(REGEX REPLACE "[-][l]" "" GDAL_LIB_NAME ${GDAL_LIB_NAME_WITH_PREFIX} )
+ ENDIF (GDAL_LIB_NAME_WITH_PREFIX)
+
+ IF (APPLE)
+ SET(GDAL_LIBRARY ${GDAL_LINK_DIRECTORIES}/lib${GDAL_LIB_NAME}.dylib CACHE STRING INTERNAL)
+ ELSE (APPLE)
+ SET(GDAL_LIBRARY ${GDAL_LINK_DIRECTORIES}/lib${GDAL_LIB_NAME}.so CACHE STRING INTERNAL)
+ ENDIF (APPLE)
+
+ ELSE(GDAL_CONFIG)
+ MESSAGE("FindGDAL.cmake: gdal-config not found. Please set it manually. GDAL_CONFIG=${GDAL_CONFIG}")
+ ENDIF(GDAL_CONFIG)
+
+ ENDIF(UNIX)
+ENDIF(WIN32)
+
+
+IF (GDAL_INCLUDE_DIR AND GDAL_LIBRARY)
+ SET(GDAL_FOUND TRUE)
+ENDIF (GDAL_INCLUDE_DIR AND GDAL_LIBRARY)
+
+IF (GDAL_FOUND)
+
+ IF (NOT GDAL_FIND_QUIETLY)
+ MESSAGE(STATUS "Found GDAL: ${GDAL_LIBRARY}")
+ ENDIF (NOT GDAL_FIND_QUIETLY)
+
+ELSE (GDAL_FOUND)
+
+ MESSAGE(GDAL_INCLUDE_DIR=${GDAL_INCLUDE_DIR})
+ MESSAGE(GDAL_LIBRARY=${GDAL_LIBRARY})
+ MESSAGE(FATAL_ERROR "Could not find GDAL")
+
+ENDIF (GDAL_FOUND)
Added: trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGEOS.cmake
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGEOS.cmake (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindGEOS.cmake 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,45 @@
+
+# CMake module to search for GEOS library
+#
+# If it's found it sets GEOS_FOUND to TRUE
+# and following variables are set:
+# GEOS_INCLUDE_DIR
+# GEOS_LIBRARY
+
+
+FIND_PATH(GEOS_INCLUDE_DIR geos.h
+ /usr/local/include
+ /usr/include
+ #MSVC
+ "$ENV{LIB_DIR}/include"
+ #mingw
+ c:/msys/local/include
+ )
+
+FIND_LIBRARY(GEOS_LIBRARY NAMES geos PATHS
+ /usr/local/lib
+ /usr/lib
+ #MSVC
+ "$ENV{LIB_DIR}/lib"
+ #mingw
+ c:/msys/local/lib
+ )
+
+IF (GEOS_INCLUDE_DIR AND GEOS_LIBRARY)
+ SET(GEOS_FOUND TRUE)
+ENDIF (GEOS_INCLUDE_DIR AND GEOS_LIBRARY)
+
+
+IF (GEOS_FOUND)
+
+ IF (NOT GEOS_FIND_QUIETLY)
+ MESSAGE(STATUS "Found GEOS: ${GEOS_LIBRARY}")
+ ENDIF (NOT GEOS_FIND_QUIETLY)
+
+ELSE (GEOS_FOUND)
+
+ IF (GEOS_FIND_REQUIRED)
+ MESSAGE(FATAL_ERROR "Could not find GEOS")
+ ENDIF (GEOS_FIND_REQUIRED)
+
+ENDIF (GEOS_FOUND)
Added: trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindQGIS.cmake
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindQGIS.cmake (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/cmake_find_rules/FindQGIS.cmake 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,100 @@
+## Once run this will define:
+##
+## QGIS_FOUND = system has QGIS lib
+##
+## QGIS_CORE_LIBRARY = full path to the CORE library
+## QGIS_GUI_LIBRARY = full path to the GUI library
+## QGIS_PLUGIN_DIR = full path to where QGIS plugins are installed
+## QGIS_INCLUDE_DIR = where to find headers
+##
+## Tim Sutton
+
+#MESSAGE("Searching for QGIS")
+IF(WIN32)
+ #MESSAGE("Searching for QGIS in C:/program files/Quantum GIS")
+ IF (MINGW)
+ FIND_PATH(QGIS_PLUGIN_DIR libnortharrowplugin.dll
+ "C:/Program Files/Quantum GIS/plugins"
+ )
+ FIND_PATH(QGIS_INCLUDE_DIR qgsapplication.h
+ "C:/Program Files/Quantum GIS/include"
+ )
+ FIND_LIBRARY(QGIS_CORE_LIBRARY NAMES qgis_core PATHS
+ "C:/Program Files/Quantum GIS/"
+ )
+ FIND_LIBRARY(QGIS_GUI_LIBRARY NAMES qgis_gui PATHS
+ "C:/Program Files/Quantum GIS/"
+ )
+ ENDIF (MINGW)
+
+ IF (MSVC)
+ FIND_PATH(QGIS_PLUGIN_DIR libnortharrowplugin.dll
+ "C:/Program Files/Quantum GIS/lib/qgis"
+ )
+ FIND_PATH(QGIS_INCLUDE_DIR qgsapplication.h
+ "$ENV{LIB_DIR}/include/qgis"
+ )
+ FIND_LIBRARY(QGIS_CORE_LIBRARY NAMES qgis_core PATHS
+ "$ENV{LIB_DIR}/lib/"
+ )
+ FIND_LIBRARY(QGIS_GUI_LIBRARY NAMES qgis_gui PATHS
+ "$ENV{LIB_DIR}/lib/"
+ )
+ ENDIF (MSVC)
+
+ELSE(WIN32)
+ IF(UNIX)
+
+ # try to use bundle on mac
+ IF (APPLE)
+ #MESSAGE("Searching for QGIS in /Applications/QGIS.app/Contents/MacOS")
+ SET (QGIS_MAC_PATH /Applications/QGIS1.0.0.app/Contents/MacOS)
+ SET (QGIS_LIB_DIR ${QGIS_MAC_PATH}/lib)
+ SET (QGIS_PLUGIN_DIR ${QGIS_MAC_PATH}/lib/qgis CACHE STRING INTERNAL)
+ # set INCLUDE_DIR to prefix+include
+ SET(QGIS_INCLUDE_DIR ${QGIS_MAC_PATH}/include/qgis CACHE STRING INTERNAL)
+ ## extract link dirs
+ SET(QGIS_CORE_LIBRARY ${QGIS_LIB_DIR}/libqgis_core.dylib CACHE STRING INTERNAL)
+ SET(QGIS_GUI_LIBRARY ${QGIS_LIB_DIR}/libqgis_gui.dylib CACHE STRING INTERNAL)
+ ELSE (APPLE) # Unix / Linux
+ #MESSAGE("Searching for QGIS in /usr/bin; /usr/local/bin")
+ FIND_PATH(QGIS_PLUGIN_DIR libnortharrowplugin.so
+ /usr/lib/qgis
+ /usr/local/lib/qgis
+ "$ENV{LIB_DIR}/lib/qgis"
+ )
+ FIND_PATH(QGIS_INCLUDE_DIR qgis.h
+ /usr/include/qgis
+ /usr/local/include/qgis
+ "$ENV{LIB_DIR}/include/qgis"
+ )
+ FIND_LIBRARY(QGIS_CORE_LIBRARY NAMES qgis_core PATHS
+ /usr/lib
+ /usr/local/lib
+ "$ENV{LIB_DIR}/lib"
+ )
+ FIND_LIBRARY(QGIS_GUI_LIBRARY NAMES qgis_gui PATHS
+ /usr/lib
+ /usr/local/lib
+ "$ENV{LIB_DIR}/lib"
+ )
+ ENDIF (APPLE)
+ ENDIF(UNIX)
+ENDIF(WIN32)
+
+
+IF (QGIS_INCLUDE_DIR AND QGIS_CORE_LIBRARY AND QGIS_GUI_LIBRARY)
+ SET(QGIS_FOUND TRUE)
+ENDIF (QGIS_INCLUDE_DIR AND QGIS_CORE_LIBRARY AND QGIS_GUI_LIBRARY)
+
+IF (QGIS_FOUND)
+ IF (NOT QGIS_FIND_QUIETLY)
+ MESSAGE(STATUS "Found QGIS Core: ${QGIS_CORE_LIBRARY}")
+ MESSAGE(STATUS "Found QGIS Gui: ${QGIS_GUI_LIBRARY}")
+ MESSAGE(STATUS "Found QGIS Plugins Dir: ${QGIS_PLUGIN_DIR}")
+ ENDIF (NOT QGIS_FIND_QUIETLY)
+ELSE (QGIS_FOUND)
+ IF (QGIS_FIND_REQUIRED)
+ MESSAGE(FATAL_ERROR "Could not find QGIS")
+ ENDIF (QGIS_FIND_REQUIRED)
+ENDIF (QGIS_FOUND)
Added: trunk/code_examples/1_hello_world_qgis_style/main.cpp
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/main.cpp (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/main.cpp 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,63 @@
+//
+// QGIS Includes
+//
+#include <qgsapplication.h>
+#include <qgsproviderregistry.h>
+#include <qgssinglesymbolrenderer.h>
+#include <qgsmaplayerregistry.h>
+#include <qgsvectorlayer.h>
+#include <qgsmapcanvas.h>
+//
+// Qt Includes
+//
+#include <QString>
+#include <QApplication>
+#include <QWidget>
+
+int main(int argc, char ** argv)
+{
+ // Start the Application
+ QgsApplication app(argc, argv, true);
+
+ QString myPluginsDir = "/home/timlinux/apps/lib/qgis";
+ QString myLayerPath = "/home/timlinux/gisdata/brazil/BR_Cidades/";
+ QString myLayerBaseName = "Brasil_Cap";
+ QString myProviderName = "ogr";
+ // Instantiate Provider Registry
+ QgsProviderRegistry::instance(myPluginsDir);
+ // create a maplayer instance
+ QgsVectorLayer * mypLayer =
+ new QgsVectorLayer(myLayerPath, myLayerBaseName, myProviderName);
+ QgsSingleSymbolRenderer *mypRenderer = new QgsSingleSymbolRenderer(mypLayer->geometryType());
+ QList <QgsMapCanvasLayer> myLayerSet;
+ mypLayer->setRenderer(mypRenderer);
+ if (mypLayer->isValid())
+ {
+ qDebug("Layer is valid");
+ }
+ else
+ {
+ qDebug("Layer is NOT valid");
+ }
+
+ // Add the Vector Layer to the Layer Registry
+ QgsMapLayerRegistry::instance()->addMapLayer(mypLayer, TRUE);
+ // Add the Layer to the Layer Set
+ myLayerSet.append(QgsMapCanvasLayer(mypLayer, TRUE));
+
+ // Create the Map Canvas
+ QgsMapCanvas * mypMapCanvas = new QgsMapCanvas(0, 0);
+ mypMapCanvas->setExtent(mypLayer->extent());
+ mypMapCanvas->enableAntiAliasing(true);
+ mypMapCanvas->setCanvasColor(QColor(255, 255, 255));
+ mypMapCanvas->freeze(false);
+ // Set the Map Canvas Layer Set
+ mypMapCanvas->setLayerSet(myLayerSet);
+ mypMapCanvas->setVisible(true);
+ mypMapCanvas->refresh();
+
+ // Start the Application Event Loop
+ return app.exec();
+}
+
+
Added: trunk/code_examples/1_hello_world_qgis_style/tutorial1.html
===================================================================
--- trunk/code_examples/1_hello_world_qgis_style/tutorial1.html (rev 0)
+++ trunk/code_examples/1_hello_world_qgis_style/tutorial1.html 2008-11-08 10:47:50 UTC (rev 9589)
@@ -0,0 +1,139 @@
+<img src="images/tim50x50.png" align="left">Ok so not everyone wants a full blown GIS desktop application. Sometimes you want to just have a widget inside your application that displays a map while the main goal of the application lies elsewhere. Perhaps a database frontend with a map display?
+
+<bold>Updated November 2008 to use cmake build system and the updated QGIS 1.0.0 API. Tim</bold>
+
+<!--break-->
+So lets take a little walk through creating a simple mapping widget. It wont do anything much - just load a shape file and display it in a random colour. But it should give you an idea of the potential for using QGIS as an embedded mapping component. Before I carry on, many thanks to Francis Bolduc who wrote the beginnings of this demo and then came onto IRC today to do some communal debugging of his prototype. Francis kindly agreed to make his work generally available - though I've tweaked it a bit to use shapefiles instead of his original postgis demo.
+
+We start with typical adding the neccessary includes for our app:
+
+<pre>
+//
+// QGIS Includes
+//
+#include <qgsapplication.h>
+#include <qgsproviderregistry.h>
+#include <qgssinglesymbolrenderer.h>
+#include <qgsmaplayerregistry.h>
+#include <qgsvectorlayer.h>
+#include <qgsmapcanvas.h>
+//
+// Qt Includes
+//
+#include <QString>
+#include <QApplication>
+#include <QWidget>
+
+</pre>
+
+We use QgsApplication instead of Qt's QApplication, and get some added benifits of various static methods that can be used to locate library paths and so on.
+
+The provider registry is a singleton that keeps track of vector data provider plugins. It does all the work for you of loading the plugins and so on. The single symbol renderer is the most basic symbology class. It renders points, lines or polygons in a single colour which is chosen at random by default (though you can set it yourself). Every vector layer must have a symbology associated with it.
+
+The map layer registry keeps track of all the layers you are using. The vector layer class inherits from maplayer and extends it to include specialist functionality for vector data.
+
+Finally the mapcanvas is really the nub of the matter. Its the drawable widget that our map will be drawn onto.
+
+Now we can move on to initialising our application....
+
+<pre>
+int main(int argc, char ** argv)
+{
+ // Start the Application
+ QgsApplication app(argc, argv, true);
+
+ QString myPluginsDir = "/home/timlinux/apps/lib/qgis";
+ QString myLayerPath = "/home/timlinux/gisdata/brazil/BR_Cidades/";
+ QString myLayerBaseName = "Brasil_Cap";
+ QString myProviderName = "ogr";
+
+</pre>
+
+So now we have a qgsapplication and we have defined some variables. Since I tested this on the Ubuntu 8.10, I just specified the location of the vector provider plugins as being inside the my development install directory. It would probaby make more sense in general to keep the QGIS libs in one of the standard library search paths on your system (e.g. /usr/lib) but this way will do for now.
+
+The next two variables defined here just point to the shapefile I am going to be using (and you should substitute your own data here).
+
+The provider name is important - it tells qgis which data provider to use to load the file. Typically you will use 'ogr' or 'postgres'.
+
+Now we can go on to actually create our layer object.
+
+<pre>
+ // Instantiate Provider Registry
+ QgsProviderRegistry::instance(myPluginsDir);
+</pre>
+
+First we get the provider registry initialised. Its a singleton class so we use the static instance call and pass it the provider lib search path. As it initialises it will scan this path for provider libs.
+
+Now we go on to create a layer...
+
+<pre>
+ QgsVectorLayer * mypLayer =
+ new QgsVectorLayer(myLayerPath, myLayerBaseName, myProviderName);
+ QgsSingleSymbolRenderer *mypRenderer = new QgsSingleSymbolRenderer(mypLayer->geometryType());
+ QList <QgsMapCanvasLayer> myLayerSet;
+
+ mypLayer->setRenderer(mypRenderer);
+ if (mypLayer->isValid())
+ {
+ qDebug("Layer is valid");
+ }
+ else
+ {
+ qDebug("Layer is NOT valid");
+ }
+
+ // Add the Vector Layer to the Layer Registry
+ QgsMapLayerRegistry::instance()->addMapLayer(mypLayer, TRUE);
+ // Add the Layer to the Layer Set
+ myLayerSet.append(QgsMapCanvasLayer(mypLayer, TRUE));
+
+</pre>
+
+The code is fairly self explanatory here. We create a layer using the variables we defined earlier. Then we assign the layer a renderer. When we create a renderer, we need to specify the geometry type, which do do by asking the vector layer for its geometry type. Next we add the layer to a layerset (which is used by the QgsMapCanvas to keep track of which layers to render and in what order) and to the maplayer registry. Finally we make sure the layer will be visible.
+
+Now we create a map canvas on to which we can draw the layer.
+
+<pre>
+ // Create the Map Canvas
+ QgsMapCanvas * mypMapCanvas = new QgsMapCanvas(0, 0);
+ mypMapCanvas->setExtent(mypLayer->extent());
+ mypMapCanvas->enableAntiAliasing(true);
+ mypMapCanvas->setCanvasColor(QColor(255, 255, 255));
+ mypMapCanvas->freeze(false);
+ // Set the Map Canvas Layer Set
+ mypMapCanvas->setLayerSet(myLayerSet);
+ mypMapCanvas->setVisible(true);
+ mypMapCanvas->refresh();
+
+</pre>
+
+Once again there is nothing particularly tricky here. We create the canvas and then we set its extents to those of our layer. Next we tweak the canvas a bit to draw antialiased vectors. Next we set the background colour, unfreeze the canvas, make it visible and then refresh it.
+
+<pre>
+ // Start the Application Event Loop
+ return app.exec();
+}
+
+</pre>
+
+In the last step we simply start the Qt event loop and we are all done. Easy as 1-2-3 eh?
+
+This example can be checked out of subversion, compiled and run using cmake like this:
+
+<pre>
+svn co https://svn.osgeo.org/qgis/trunk/code_examples/1_hello_world_qgis_style
+cd 1_hello_world_qgis_style
+mkdir build
+#optionally specify where your QGIS is installed (should work on all platforms)
+#if your QGIS is installed to /usr or /usr/local you can leave this next step out
+export LIB_DIR=/home/timlinux/apps
+cmake ..
+make
+./timtut1
+</pre>
+
+When we compile and run it here is what the running app looks like:
+
+<img src="http://blog.qgis.org/files/libqgis_minimal_example.jpg">
+
+Once again many thanks to Francis for prompting this posting.
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