Showing the Mouse Position

When data is loaded in the map, we set in input callback to show mouse position:

if (_mapInfo) {

view->setInputCallback(_showMousePosition, this);

}

This callback class calls the showMousePosition method each time an input event occurs in the view:

void _showMousePosition(IlvView* view, IlvEvent& event, IlAny arg)

{

SimpleMapViewer* mapViewer = (SimpleMapViewer*) arg;

mapViewer->showMousePosition(view, event);

}

This method first initializes some buffers to display information:

void

SimpleMapViewer::showMousePosition(IlvView* view, IlvEvent& event)

{

char buf1[12];

char buf2[12];

char label[50];

}

Then, we get the last object that was under the mouse position, and if any, we get the name of this object to display it as a city name:

IlvManager* manager = _mapInfo->getManager();

const char* name = "";

IlvPoint p(event.x(), event.y());

IlvGraphic* g = manager->lastContains(p, view);

if (g && g->getName())

name = g->getName();

Then we use again our IlvMapInfo instance to convert manager coordinates of the mouse back to geographical coordinates:

IlvCoordinate ll;

if (_mapInfo->inverse(event, view, ll) == IlvMaps::NoError())

sprintf(label, "%s %s %s",

IlvMaps::RadianToDMS(buf1, ll.x(), IlFalse),

IlvMaps::RadianToDMS(buf2, ll.y(), IlTrue),

name);

else

sprintf(label, "Unable to invert mouse position");

Then, finally, we set the label into the status bar:

_statusBar->setLabel(label);

_statusBar->reDraw();

Published date: 05/24/2022

Last modified date: 02/24/2022