Hi everyone,
We tried to follow tutorial 1 ("Write a sample mapping application using new
QGIS Canvas API") and tutorial 2 ("Using Map Tools with the QGIS Canvas API" to
create an application based on QGIS librairies (under Windows, Qt4.2, compil
with mingw). We got problems trying to show not one, but two default layers at
start. Indeed, the program does not take layers identified by
"myLayerBaseName", but the first one according to alphabetical order (in
"myLayerPath"). The path "myLayerPath" is the right one, tough. We tried many
changes to that code, but none gave us the answer.
Someone got a cue?
Thanks in advance.
//
// 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>
//
// Std Includes
//
#include <deque.h>
#include <iostream>
int main(int argc, char ** argv)
{
// Start the Application
QgsApplication app(argc, argv, true);
QString myPluginsDir =
"C:\\qgis\\bolduc\\qgis\\qgis-0.8.0-Preview-2-bin-win32\\lib\\qgis";
QString myLayerPath = "data";
QString myLayerBaseName = "test";
QString myProviderName = "ogr";
// Instantiate Provider Registry
QgsProviderRegistry::instance(myPluginsDir);
QgsVectorLayer * mypLayer =
new QgsVectorLayer(myLayerPath, myLayerBaseName, myProviderName);
QgsSingleSymbolRenderer *mypRenderer = new
QgsSingleSymbolRenderer(mypLayer->vectorType());
std::deque<QString> 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.push_back(mypLayer->getLayerID());
mypLayer->setVisible(TRUE);
// Create the Map Canvas
QgsMapCanvas * mypMapCanvas = new QgsMapCanvas(0, 0);
mypMapCanvas->setExtent(mypLayer->extent());
qDebug(mypMapCanvas->extent().stringRep(2));
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();
}
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