Qt and Envitia (Tenet) MapLink Pro Accelerator toolkit

[martinb0820]

Has anyone used Qt with MapLink Pro's Accelerator toolkit? I would like to see a minimal example of its use with Qt.
Thanks!

[ibecker]

Hi, I know this is an old thread, but I just got this working myself. I found this thread while doing some searching on my own and it was no help.

So, I thought I would reply and show what I did to make MapLink Pro 6.0 work with Qt 4.8.

Firstly, make a custom QWidget class. Then in the widget's constructor, set the following attributes.

setAttribute(Qt::WA_NoBackground, true);
setAttribute(Qt::WA_NoSystemBackground, true);
setAttribute(Qt::WA_PaintOnScreen, true);
setAutoFillBackground(false);
setAttribute(Qt::WA_OpaquePaintEvent, true);

setAttribute(Qt::WA_NoBackground, true);
setAttribute(Qt::WA_NoSystemBackground, true);
setAttribute(Qt::WA_PaintOnScreen, true);
setAutoFillBackground(false);
setAttribute(Qt::WA_OpaquePaintEvent, true);

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You will also need to override the paintEngine function like so:

QPaintEngine* paintEngine() const  //Works in conjunction with WA_PaintOnScreen
{
    return NULL;
}

QPaintEngine* paintEngine() const  //Works in conjunction with WA_PaintOnScreen
{
    return NULL;
}

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Override the paintEvent:

void QMapView::paintEvent(QPaintEvent *)
{    
    if (m_bInitialUpdate)  //Set to true in constructor
    {
        MainWindow* main = static_cast<MainWindow*>(parentWidget()->parentWidget());
        if (main)
        {
            HWND hWnd = (HWND)winId();
            m_drawingSurface = new TSLNTSurface(hWnd, false);
            m_drawingSurface->setOption( TSLOptionDoubleBuffered, true ) ;
            m_drawingSurface->wndResize( 0, 0, rect().width(), rect().height() ) ;
 
            m_drawingSurface->addDataLayer(main->m_dataLayer, "map");
            m_drawingSurface->addDataLayer(main->m_stdDataLayer, "overlay");  //Not needed if you don't want an overlay
            m_drawingSurface->reset(false);
            m_bMapLoaded = true;
            m_drawingSurface->setDataLayerProps( "map" , TSLPropertyBuffered  , 1 ) ;
        }
 
        m_bInitialUpdate = false;
    }
    if (m_drawingSurface)
        m_drawingSurface->drawDU(rect().left(), rect().top(), rect().right(), rect().bottom(), true, true);
}

void QMapView::paintEvent(QPaintEvent *)
{    
    if (m_bInitialUpdate)  //Set to true in constructor
    {
        MainWindow* main = static_cast<MainWindow*>(parentWidget()->parentWidget());
        if (main)
        {
            HWND hWnd = (HWND)winId();
            m_drawingSurface = new TSLNTSurface(hWnd, false);
            m_drawingSurface->setOption( TSLOptionDoubleBuffered, true ) ;
            m_drawingSurface->wndResize( 0, 0, rect().width(), rect().height() ) ;

            m_drawingSurface->addDataLayer(main->m_dataLayer, "map");
            m_drawingSurface->addDataLayer(main->m_stdDataLayer, "overlay");  //Not needed if you don't want an overlay
            m_drawingSurface->reset(false);
            m_bMapLoaded = true;
            m_drawingSurface->setDataLayerProps( "map" , TSLPropertyBuffered  , 1 ) ;
        }

        m_bInitialUpdate = false;
    }
    if (m_drawingSurface)
        m_drawingSurface->drawDU(rect().left(), rect().top(), rect().right(), rect().bottom(), true, true);
}

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In our main window:

TSLErrorStack::clear();
TSLDrawingSurface::loadStandardConfig();
 
QString err(TSLErrorStack::errorString());
if (!err.isNull())
    qDebug(qPrintable(err));
 
m_dataLayer = new TSLMapDataLayer();
QString filename = QFileDialog::getOpenFileName(this, "Open map");  //Get a map to open
m_dataLayer->loadData(filename.toStdString().c_str());
 
err = TSLErrorStack::errorString("Cannot load map\n");
if (!err.isNull())
{
    m_bMapLoaded = false;
    qDebug(qPrintable(err));
}
m_stdDataLayer = new TSLStandardDataLayer();

TSLErrorStack::clear();
TSLDrawingSurface::loadStandardConfig();

QString err(TSLErrorStack::errorString());
if (!err.isNull())
    qDebug(qPrintable(err));

m_dataLayer = new TSLMapDataLayer();
QString filename = QFileDialog::getOpenFileName(this, "Open map");  //Get a map to open
m_dataLayer->loadData(filename.toStdString().c_str());

err = TSLErrorStack::errorString("Cannot load map\n");
if (!err.isNull())
{
    m_bMapLoaded = false;
    qDebug(qPrintable(err));
}
m_stdDataLayer = new TSLStandardDataLayer();

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In the .pro file:

LIBS += -L<MapLinkDirHere>/lib -lMapLink
INCLUDEPATH += <MapLinkDirHere>/include
DEPENDPATH += <MapLinkDirHere>/include

LIBS += -L<MapLinkDirHere>/lib -lMapLink
INCLUDEPATH += <MapLinkDirHere>/include
DEPENDPATH += <MapLinkDirHere>/include

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When I used -lMapLinkd, there we crashes. Using the non-debug library works fine and there still seems to be debug information available.


This should be all you need to get MapLink to draw a map in your custom QWidget. Override methods for mouse events, resize events, keyboard events as you need.


Make sure to include "MapLink.h" where needed!