Qt4.8.6+mingw+Qgis2.4.0基于QGis的二次开发

关于QGis的二次开发，大致看了一下，基本都是在VC+QT的环境下做环境部署，而且QGis的版本非常老，在mingw下直接开发搭建环境的例子少之又少，基于最新的Qgis2.4.0版本做了相应的尝试，并成功搭建相应的环境，大致的配置如下：

由于在搭建的过程之中遇到的问题实在太多，没有一一记录下来，所以在本文中没有做过多的描述，如有疑问可以联系[e-mail]，或者留言

环境搭建

pro文件配置

QT       += core gui xmlgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsTARGET = qgisdemoTEMPLATE = appSOURCES += main.cpp# \    #mainwindow.cpp#INCLUDEPATH += qgis-2.4.0#INCLUDEPATH += qgis-2.4.0\core#INCLUDEPATH += qgis-2.4.0\core\symbology-ng#INCLUDEPATH += qgis-2.4.0\analysis#INCLUDEPATH += qgis-2.4.0\guiINCLUDEPATH += qgis-2.4.0INCLUDEPATH += qgis-2.4.0/coreINCLUDEPATH += qgis-2.4.0/core/symbology-ngINCLUDEPATH += qgis-2.4.0/analysisINCLUDEPATH += qgis-2.4.0/guiFORMS    += mainwindow.uiwin32:CONFIG(release, debug|release): LIBS += -L$$PWD/lib/ -llibqgis_analysiselse:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/lib/ -llibqgis_analysiselse:unix:!macx: LIBS += -L$$PWD/lib/ -llibqgis_analysisINCLUDEPATH += $$PWD/DEPENDPATH += $$PWD/win32:CONFIG(release, debug|release): LIBS += -L$$PWD/lib/ -llibqgis_coreelse:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/lib/ -llibqgis_coreelse:unix:!macx: LIBS += -L$$PWD/lib/ -llibqgis_coreINCLUDEPATH += $$PWD/DEPENDPATH += $$PWD/win32:CONFIG(release, debug|release): LIBS += -L$$PWD/lib/ -llibqgis_guielse:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/lib/ -llibqgis_guielse:unix:!macx: LIBS += -L$$PWD/lib/ -llibqgis_guiINCLUDEPATH += $$PWD/DEPENDPATH += $$PWD/

实例

#include <QApplication>

#include <QString>

#include <QWidget>

#include <qgis.h>

#include <qgsapplication.h>

#include <qgsproviderregistry.h>

#include <qgssinglesymbolrendererv2.h>

#include <qgsmaplayerregistry.h>

#include <qgsvectorlayer.h>

#include <qgsmapcanvas.h>

#include <qgsgeometry.h>

#include "mouseprocess.h"

#include "paintprocess.h"

int main( int argc, char *argv[] )

{

    QgsApplication a( argc, argv ,true);

    //////////////////////////////////////////////////////////////////////////

    //注意这三行代码需要更改路径;

    QString myPluginsDir        ="D:/Qt/workspace/qgis-2.4.0/qgis-2.4.0/build/output/plugins";//插件路径(编译好的qgis文件夹下的plugins文件夹);

    QString myLayerPath1         ="F:/gis/data_1_3/10m_admin_0_countries.shp";//图层路径,必须设置为你电脑里面shp文件的路径,不然打不开数据;

    QString myLayerPath2         ="F:/gis/qgis_sample_data/shapefiles/airports.shp";//图层路径,必须设置为你电脑里面shp文件的路径,不然打不开数据;

    //////////////////////////////////////////////////////////////////////////

    QgsProviderRegistry::instance( myPluginsDir); //初始化插件的目录;

    QgsVectorLayer * mypLayer1 = new QgsVectorLayer( myLayerPath1, "myLayer1", "ogr" ); //初始化矢量图层;

    QgsVectorLayer * mypLayer2 = new QgsVectorLayer( myLayerPath2, "myLayer2", "ogr" ); //初始化矢量图层;

    QgsVectorLayer * mypLayer3 = new QgsVectorLayer(); //初始化矢量图层;

    mypLayer3->setRendererV2(QgsFeatureRendererV2::defaultRenderer(QGis::Point));

    QgsFeatureIterator iter = mypLayer2->getFeatures();

    QgsFeature feature;

    while(iter.nextFeature(feature)){

        QgsGeometry *geo = feature.geometry();

        QgsPoint point = geo->asPoint();

        //qDebug() << point.x() << point.y() << endl;

    }

    for(int index = 0; index < 100; index ++){

        QgsPoint point;

        double xmin = -4.4802e+06;

        double xmax = 4.61512e+06;

        double ymin = 1.43353e+06;

        double ymax = 6.50259e+06;

        point.setX(xmin + (xmax - xmin) * ((double) qrand()) / RAND_MAX);

        point.setY(ymin + (ymax - ymin) * ((double) qrand()) / RAND_MAX);

        QgsFeature feature;

        QgsGeometry *geo = QgsGeometry::fromPoint(point);

        feature.setGeometry(geo);

        mypLayer3->addFeature(feature);

        mypLayer3->updateFeature(feature);

        qDebug() << point.x() << point.y() << endl;

    }

    QList<QgsPoint> ring;

    //-4.4802e+06 4.61512e+06 1.43353e+06 6.50259e+06

    ring.append(QgsPoint(-4.4802e+06, 1.43353e+06));

    ring.append(QgsPoint(4.61512e+06, 6.50259e+06));

    ring.append(QgsPoint(2.61512e+06, 4.50259e+06));

    //mypLayer2->addRing(ring);

    qDebug() << mypLayer2->featureCount() << endl;

    //QgsSingleSymbolRendererV2 *mypRenderer = new QgsSingleSymbolRendererV2( mypLayer->geometryType() );

    QList <QgsMapCanvasLayer> myLayerSet;

    // mypLayer->setRenderer( mypRenderer );

    //mypLayer->setRendererV2(mypRenderer);

    QgsMapLayerRegistry::instance()->addMapLayer( mypLayer1, true );

    QgsMapLayerRegistry::instance()->addMapLayer( mypLayer2, true );

    QgsMapLayerRegistry::instance()->addMapLayer( mypLayer3, true );

    //myLayerSet.append( QgsMapCanvasLayer(mypLayer3, true ) );

    myLayerSet.append( QgsMapCanvasLayer(mypLayer2, true ) );

    //myLayerSet.append( QgsMapCanvasLayer(mypLayer1, true ) );

    QgsRectangle extent = mypLayer2->extent();

    qDebug() << extent.xMinimum() << extent.xMaximum() << extent.yMinimum() << extent.yMaximum() << endl;

    QgsMapCanvas * mypMapCanvas = new QgsMapCanvas( 0, 0 );

    mypMapCanvas->setExtent(mypLayer2->extent() );

    mypMapCanvas->enableAntiAliasing( true);

    mypMapCanvas->setCanvasColor( QColor(255, 255, 255 ) );

    mypMapCanvas->freeze( false );

    mypMapCanvas->setLayerSet( myLayerSet);

    mypMapCanvas->setVisible( true );

    mypMapCanvas->refresh();

    mypMapCanvas->show();

    MouseProcess *mouseProcess = new MouseProcess();

    PaintProcess *paintProcess = new PaintProcess();

    QObject::connect(mypMapCanvas, SIGNAL(xyCoordinates(QgsPoint)), mouseProcess, SLOT(xyCoordinates(QgsPoint)));

    QObject::connect(mypMapCanvas, SIGNAL(renderComplete(QPainter*)), paintProcess, SLOT(renderComplete(QPainter*)));

    return a.exec();

}

运行结果