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| {{Upravit}} | | {{freegiswiki|QGIS / Tvorba zásuvného modulu}} |
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| Stránka obsahuje poznámky pro tvorbu vlastního [http://cs.wikipedia.org/wiki/Plugin zásuvného modulu] pro aplikaci [[QGIS]]. Navržený modul má na vstupu dvě vektorové vrstvy - bodovou a polygonovou. Na výstupu vytvoří novou vektorovou vrstvu obsahující pouze body ležící uvnitř polygonů (viz [[Programování s knihovnou OGR#Prostorové predikáty|příklad pro knihovnu OGR]]). Uvedený text čerpá především z [http://download.osgeo.org/qgis/doc/manual/qgis-1.5.0_coding-compilation_guide_en.pdf QGIS Coding and Compilation Guide]. Zdrojové texty najdete [http://geo.fsv.cvut.cz/~landa/vyuka/2010/qgis/sampleplugin/ zde].
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| __TOC__
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| == Minimální kód ==
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| Projekt obsahuje tři soubory:
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| ; Soubor projektu sampleplugin.pro
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| <source lang="cpp">
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| # cesta k adresari se zdrojovymi texty QGISu
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| QGIS_DIR = /opt/src/qgis_trunk
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| TEMPLATE = lib
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| CONFIG = qt
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| QT += xml
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| unix:LIBS += -L/$$QGIS_DIR/lib \
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| -lqgis_core \
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| -lqgis_gui
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| INCLUDEPATH += $$QGIS_DIR/src/ui \
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| $$QGIS_DIR/src/plugins \
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| $$QGIS_DIR/src/gui \
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| $$QGIS_DIR/src/raster \
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| $$QGIS_DIR/src/core \
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| $$QGIS_DIR
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| SOURCES = qgssampleplugin.cpp
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| HEADERS = qgssampleplugin.h
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| DEST = sampleplugin.so
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| DEFINES += GUI_EXPORT= \
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| CORE_EXPORT=
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| </source>
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| ; Hlavičkový soubor pluginu qgssampleplugin.h
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| <source lang="cpp">
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| #ifndef QGSSAMPLEPLUGIN_H
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| #define QGSSAMPLEPLUGIN_H
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| #include "qgisplugin.h"
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| /* Testovaci plugin pro QGIS - prostorove predikaty */
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| class QgsSamplePlugin: public QgisPlugin
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| {
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| public:
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| QgsSamplePlugin(QgisInterface *);
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| ~QgsSamplePlugin();
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| void initGui();
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| void unload();
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| private:
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| QgisInterface *mIface;
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| };
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| #endif // QGSSAMPLEPLUGIN_H
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| </source>
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| ; C++ soubor qgssampleplugin.cpp
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| <source lang="cpp">
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| #include "qgssampleplugin.h"
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| #ifdef WIN32
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| #define QGISEXTERN extern "C" __declspec( dllexport )
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| #else
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| #define QGISEXTERN extern "C"
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| #endif
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| QgsSamplePlugin::QgsSamplePlugin(QgisInterface* iface): mIface(iface)
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| {
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| }
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| QgsSamplePlugin::~QgsSamplePlugin()
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| {
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| }
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| // Zobrazit elementy GUI nastrojove listy a menu pluginu
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| void QgsSamplePlugin::initGui()
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| {
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| }
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| // Odstranit alokovane GUI elementy
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| void QgsSamplePlugin::unload()
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| {
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| }
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| // generator pluginu
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| QGISEXTERN QgisPlugin* classFactory(QgisInterface* iface)
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| {
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| return new QgsSamplePlugin(iface);
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| }
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| QGISEXTERN QString name()
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| {
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| return "Within";
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| }
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| QGISEXTERN QString description()
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| {
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| return "Prostorovy predikat within";
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| }
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| QGISEXTERN QString version()
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| {
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| return "0.00001";
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| }
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| // Typ pluginu (UI nebo MapLayer plugin)
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| QGISEXTERN int type()
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| {
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| return QgisPlugin::UI;
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| }
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| // Odstranit plugin
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| QGISEXTERN void unload(QgisPlugin* theQgsSamplePluginPointer)
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| {
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| delete theQgsSamplePluginPointer;
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| }
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| </source>
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| == Ikonka, tlačítko a menu pluginu ==
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| Modifikujeme [http://doc.qgis.org/head/classQgisInterface.html QgisInterface], přidáme [http://doc.trolltech.com/4.7/qaction.html QAction] se slotem <tt>within()</tt>. Třída <tt>SamplePlugin</tt> bude odvozena z třídy [http://doc.trolltech.com/latest/qobject.html QObject].
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| ; Hlavičkový soubor pluginu qgssampleplugin.h
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| <source lang="cpp">
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| ...
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| #include "qgisplugin.h"
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| #include <QObject>
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| class QAction;
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| /* Testovaci plugin pro QGIS - prostorove predikaty */
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| class QgsSamplePlugin: public QObject, public QgisPlugin
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| {
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| Q_OBJECT // nutne pro pouziti mechanismu signalu a slotu
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| ...
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| private:
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| QgisInterface *mIface;
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| QAction *mAction;
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| private slots:
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| void within();
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| };
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| #endif // QGSSAMPLEPLUGIN_H
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| </source>
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| ; C++ soubor
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| <source lang="cpp">
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| #include "qgssampleplugin.h"
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| #include "qgisinterface.h"
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| #include <QAction>
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| ...
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| QgsSamplePlugin::QgsSamplePlugin(QgisInterface* iface): mIface(iface), mAction(0)
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| {
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| }
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| ...
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| // Zobrazit elementy GUI nastrojove listy a menu pluginu
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| void QgsSamplePlugin::initGui()
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| {
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| mAction = new QAction(tr("&Within"), this);
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| connect(mAction, SIGNAL(activated()), this, SLOT(within()));
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| mIface->addToolBarIcon(mAction);
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| mIface->addPluginToMenu(tr("&Prostorovy predikat"), mAction);
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| }
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| // Odstranit alokovane GUI elementy
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| void QgsSamplePlugin::unload()
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| {
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| mIface->removeToolBarIcon(mAction);
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| mIface->removePluginMenu(tr("&Prostorovy predikat"), mAction);
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| delete mAction;
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| }
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| void QgsSamplePlugin::within()
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| {
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|
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| }
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| ...
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| </source>
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| == Debugovací zprávy ==
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| Logovaní zajišťuje třída [http://doc.qgis.org/head/classQgsLogger.html QgsLogger].
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| <source lang="cpp">
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| #include "qgslogger.h"
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| ...
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| QgsLogger::debug("Layer name: " + layer1->name());
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| </source>
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| == Implementace funkce within() ==
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| == Externí odkazy ==
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| * [http://download.osgeo.org/qgis/doc/manual/qgis-1.5.0_coding-compilation_guide_en.pdf QGIS Coding and Compilation Guide]
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| * [http://doc.qgis.org/head/ QGIS API]
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| * [http://www.qgis.org/wiki/How_to_debug_QGIS_Plugins How to debug QGIS Plugins]
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| {{GFOSS}}
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| {{Programování}}
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| {{C++}}
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