[QGIS-Developer] On the fly on MapCanvas

[bachgist at gmail.com]

Dear QGIS-Developer,

I am writing a simple program to display raster data using qgis api C++.

When I open raster data that has different coordinate systems, the
on-the-fly feature does not work on my mapCanvas.

Can someone help me?

This is my code:

OpenGisData::OpenGisData(QWidget *parent)

: QMainWindow(parent)

{

    setupUi(this);

    QWidget* centralWidget = OpenGisDataClass::centralWidget;

    mMapCanvas = new QgsMapCanvas(centralWidget);

    QGridLayout* gridLayout = new QGridLayout;

    gridLayout->addWidget(mMapCanvas);

    centralWidget->setLayout(gridLayout);

    connect(actionOpen, &QAction::triggered, this, &OpenGisData::open);

}

void OpenGisData::open()

{

    QString fileName = QFileDialog::getOpenFileName(this, "Open data",
"D:\\Test");

    if (!fileName.isEmpty())

    {

        QgsRasterLayer* rasterLayer = new QgsRasterLayer(fileName);

        if (rasterLayer && rasterLayer->isValid())

        {

            QList<QgsMapLayer*> layers = mMapCanvas->layers();

            layers.append(rasterLayer);

 

            mMapCanvas->setLayers(layers);

            mMapCanvas->zoomToFullExtent();

        }

    }

}

 

Thank You

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