[Interest] How to dynamically add a MapItemView to a Map?
Paolo Angelelli
paolo.angelelli at qt.io
Wed Sep 7 12:24:38 CEST 2016
Thanks for the suggestion, now it's easier not to forget about it :-)
As for the patch i mentioned, that was related to the map center issue
you reported.
Patch being: https://codereview.qt-project.org/168204 (now merged in
5.7)
best,
Paolo
On Tue, 6 Sep 2016 22:53:31 +0530
Kishore J <kitts.mailinglists at gmail.com> wrote:
> Done. https://bugreports.qt.io/browse/QTBUG-55782
>
> Given the limitation, I think my immediate alternative is to create a
> MapItemView like component that is instantiated outside and write
> code in the map that calls addMapItem and removeMapItem on the map as
> and when the list is modified. To the drawing board...
>
> Is the patch for the bug requiring to call addMapItem for each item
> in the MapItemView delegate is due for the next release? i.e. 5.8?
>
> How about the bug relating to the setting the center of the map? Its
> easy to work around but I want to know if it's me doing something
> wrong. --
> Regards,
> Kishore
>
> On Tue, Sep 6, 2016 at 9:25 PM, Paolo Angelelli
> <paolo.angelelli at qt.io> wrote:
>
> > On Tue, 6 Sep 2016 19:04:34 +0530
> > Kishore J <kitts.mailinglists at gmail.com> wrote:
> >
> > > Hi
> > >
> > > I am inching forward with using QML maps in my C++ application.
> > > Now i'm interested in dynamically adding multiple MapItemView
> > > objects to a given map.
> > >
> > >
> > > import QtQuick 2.5
> > > import QtLocation 5.6
> > >
> > > Map {
> > > id: map
> > > objectName: "MyMap"
> > > // zoomLevel: (maximumZoomLevel - minimumZoomLevel)/2
> > > zoomLevel: minimumZoomLevel
> > >
> > > plugin: Plugin {
> > > name: "here"
> > > PluginParameter {name: "here.app_id"; value: "xxxxx"}
> > > PluginParameter {name: "here.token"; value: "xxxxx"}
> > > }
> > > // activeMapType: supportedMapTypes[3]
> > > center {
> > > latitude: 10
> > > longitude: 20
> > > }
> > >
> > > MapCircle {
> > > id: staticCircle
> > > center {
> > > latitude: 5
> > > longitude: 10
> > > }
> > > radius: 500000.0
> > > color: 'yellow'
> > > border.width: 4
> > > border.color: 'yellow'
> > > Component.onCompleted: {
> > > console.debug("Loaded static MapCircle")
> > > console.debug(center + ' radius: ' + radius)
> > > }
> > > Component.onDestruction: {
> > > console.debug("Unloaded static MapCircle")
> > > }
> > > }
> > >
> > > MapItemView {
> > > id: mapitemview
> > > objectName: "MyMapItemView"
> > > model: ListModel {
> > > id: list
> > > ListElement{lat: 10; lon: 20; rad: 800000}
> > > ListElement{lat: 30; lon: 40; rad: 700000}
> > > }
> > > delegate: Component {
> > > id: delegate
> > >
> > > MapCircle {
> > > id: dynmapcircle
> > > center {
> > > latitude: lat;
> > > longitude: lon;
> > > }
> > > radius: 500000.0
> > > color: 'black'
> > > border.width: 4
> > > border.color: 'black'
> > > Component.onCompleted: {
> > > console.count("Loaded a MapCircle")
> > > map.addMapItem(dynmapcircle)
> > > }
> > > }
> > > }
> > >
> > > Component.onCompleted: {
> > > console.debug("Loaded first MapItemView")
> > > console.debug(model.count)
> > > }
> > > Component.onDestruction: {
> > > console.debug("Unloaded first MapItemView")
> > > }
> > > }
> > >
> > > MapItemView {
> > > id: mapitemview2
> > > objectName: "MyMapItemView2"
> > > model: ListModel {
> > > id: list2
> > > ListElement{lat: -10; lon: 20; rad: 800000}
> > > ListElement{lat: -30; lon: 40; rad: 700000}
> > > }
> > > delegate: Component {
> > > id: delegate2
> > >
> > > MapCircle {
> > > id: dynmapcircle2
> > > center {
> > > latitude: lat;
> > > longitude: lon;
> > > }
> > > radius: 500000.0
> > > color: 'blue'
> > > border.width: 4
> > > border.color: 'blue'
> > > Component.onCompleted: {
> > > console.count("Loaded a MapCircle2")
> > > map.addMapItem(dynmapcircle2)
> > > }
> > > }
> > > }
> > >
> > > Component.onCompleted: {
> > > console.debug("Loaded second MapItemView")
> > > }
> > > Component.onDestruction: {
> > > console.debug("Unloaded second MapItemView")
> > > }
> > > }
> > >
> > > Component.onCompleted:{
> > > center.latitude = 10
> > > center.longitude = 20
> > > console.debug('Loaded map ' + map.center)
> > > }
> > > Component.onDestruction:{
> > > console.debug('Unloaded map')
> > > }
> > > }
> > >
> > > Further, i do not understand why i have to call the
> > > map.addMapItem() function for each MapItem. I suspect that, that
> > > is the source of my problem. I am currently able to define a
> > > separate qml file containing the second MapItemView which i
> > > instantiate in C++ and set the map as it's parent but that does
> > > not work.
> > >
> > > Any help would be appreciated.
> > > --
> > > Regards,
> > > Kishore
> > >
> > > PS: I also seem to be facing another issue where the center value
> > > specified in the map initialization does not work and I have to
> > > set the center in the onCompleted() slot. Funnily, it only
> > > considers the Latitude or Longitude value in the initialization
> > > depending on which is first specified!
> >
> > Hi, for the first question, the answer is "you can't".
> > This is a limitation of the current API, and something that might be
> > worthwile extending.
> > So feel free to send a feature request to jira.
> >
> > For the second question, please have a look if the (now merged)
> > patch fixes your bug
> >
> > best,
> > Paolo
> > _______________________________________________
> > Interest mailing list
> > Interest at qt-project.org
> > http://lists.qt-project.org/mailman/listinfo/interest
> >
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