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OSM Buildings
=============
This application shows a map obtained from OpenStreetMap (OSM) servers or a
locally limited data set when the server is unavailable using
:mod:`Qt Quick 3D <PySide6.QtQuick3D>`.
It is a subset of the equivalent C++ demo, which in addition displays
buildings. This functionality requires a special license key, though.
Queue handling
--------------
The application uses a queue to handle concurrent requests to boost up the
loading process of maps and building data.
Fetching and parsing data
-------------------------
A custom request handler class is implemented for fetching the data from the
OSM map servers.
The downloaded ``PNG`` data is sent to a custom ``QQuick3DTextureData`` item to
convert the ``PNG`` format to a texture for map tiles.
The application uses camera position, orientation, zoom level, and tilt to find
the nearest tiles in the view.
Controls
--------
When you run the application, use the following controls for navigation.
+---------+---------------------------+---------+
| | Windows | Android |
+---------+---------------------------+---------+
| Pan | Left mouse button + drag | Drag |
+---------+---------------------------+---------+
| Zoom | Mouse wheel | Pinch |
+---------+---------------------------+---------+
| Rotate | Right mouse button + drag | n/a |
+---------+---------------------------+---------+
Rendering
---------
Every chunk of the map tile consists of a QML model (the 3D geometry) and a
custom material which uses a rectangle as a base to render the tilemap texture.
.. image:: osmbuildings.webp
:align: center
:alt: OSM Buildings Demo
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