Map qml : minimumZoomLevel does not block the zoomlevel at low value

Kontiki

When setting a minimumZoomlevel to a QML map, the lower threshold is exceeded.

Here is a simple code based on the minimal map exemple :

Main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

and main.qml

import QtQuick 2.0
import QtQuick.Window 2.0
import QtLocation 5.6
import QtPositioning 5.6

Window {
	width: 1440
	height: 900
	visible: true


	Map {
		anchors.fill: parent
		plugin: Plugin {name: "osm"}
		center: QtPositioning.coordinate(59.91, 10.75) // Oslo
		zoomLevel: 10
		minimumZoomLevel: 6 //This does not block the zoomLevel

		onZoomLevelChanged: {
			console.log("minimumZoomLevel : " + minimumZoomLevel + " - current zoomLevel :" + zoomLevel)
		}
	}
}

The result is here :

qml: minimumZoomLevel : 2.4918530963296748 - current zoomLevel :2.4918530963296748
qml: minimumZoomLevel : 2.4918530963296748 - current zoomLevel :19

So, despite having specified a minimum zoom value of 6, it is overridden and the zoom range goes from 19 to 2.49, instead of 19 to 6.

What is the matter ? Is this a Qt bug or did I misunderstand the way it works ?

Thanks for help.

sierdzio

Looks like a bug, please report it.

Kontiki

Do you confirm the same behavior ?

sierdzio

@Kontiki said in Map qml : minimumZoomLevel does not block the zoomlevel at low value:

Do you confirm the same behavior ?

I haven't tried ;-)

Kontiki

Can you just try it ? And Confirm or not ?
It would be better to get a double check before I raise a Bug.

sierdzio

@Kontiki said in Map qml : minimumZoomLevel does not block the zoomlevel at low value:

Can you just try it ? And Confirm or not ?
It would be better to get a double check before I raise a Bug.

Hm, looks like it works fine on my end (Linux 64 bit, Qt 5.10.0):

qml: minimumZoomLevel : 6 - current zoomLevel :6.280000000000002
qml: minimumZoomLevel : 6 - current zoomLevel :6.160000000000002
qml: minimumZoomLevel : 6 - current zoomLevel :6.040000000000002
qml: minimumZoomLevel : 6 - current zoomLevel :6
qml: minimumZoomLevel : 6 - current zoomLevel :6

I zoom out and it stops at level 6. Then when I zoom back in and out it still upholds the limit.

Kontiki

Thanks for the try.
I am on Windows 7x64 and it does not work correctly... I'm gonna check the behavior on another computer.
No idea where the difference comes from.

Kontiki

Bug raised here : https://bugreports.qt.io/browse/QTBUG-66107

sierdzio

Thanks, I've upvoted it.