I'm building a Qt app with Python where you can point and click at a (google) map and get the coordinates of the location. The map is shown through a QWebView loading a simple HTML page and the user can create markers by clicking. Screenshot of the widget after clicking on the map.
However, I'm having trouble to retrieve the just-clicked location coordinates back to Qt (so that I can use them as variables -- and, for example, show them in the QLineEdits on the topleft corner above, as current location of the marker).
This is the relevant part of the HTML file:
<script type="text/javascript">
var map;
function initialize() {
var local = new google.maps.LatLng(-23.4,-40.3);
var myOptions = {
zoom: 5,
center: local,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
google.maps.event.addListener(map, 'rightclick', function(event) {
placeMarker(event.latLng);
});
}
function placeMarker(location) {
var clickedLocation = new google.maps.LatLng(location);
var marker = new google.maps.Marker({
position: location,
map: map
});
map.setCenter(location);
}
function dummyTxt() {
return 'This works.';
}
</script>
I've been trying with evaluateJavaScript, but was not able to retrieve the coordinates. I tried to created a function to access the position with marker.getPosition(), but with no luck. The dummy below works though..
newplace = QWebView.page().mainFrame().evaluateJavaScript(QString('dummyTxt()'))
>>> print newplace.toString()
This works.
Any suggestions on how to get the coordinates back to Qt?
--
Here is the code that worked for me:
def update_geo(self):
# Capture coordinates of the last marker on the map.
mark = self.map.page().mainFrame().evaluateJavaScript('document.getElementById("markerlocation").value').toString()
# Convert string to list of floats, stripping parentheses.
marker = str(mark).strip('()').split(', ')
decimals = [float(c) for c in marker]
Full source is in veliger.py at http://github.com/nelas/veliger