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Added HiDPI and Overzoom sections

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Martin Tůma 2023-12-10 15:53:19 +01:00 committed by GitHub
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@ -25,6 +25,11 @@ to the functions:
QPixmap pm;
pm.loadFromData(tileData, QByteArray::number(zoom));
```
For a complete code sample see the [pbf2png](https://github.com/tumic0/pbf2png)
conversion utility.
### HiDPI
The plugin supports vector scaling using QImageReader's setScaledSize() method,
so when used like in the following example:
```cpp
@ -34,6 +39,7 @@ reader.read(&image);
```
you will get 1024x1024px tiles with a pixel ratio of 2 (= HiDPI tiles).
### Overzoom
Since version 2.7 tile overzoom is supported. If you set *format* to
`$zoom;$overzoom`:
```cpp
@ -45,9 +51,6 @@ you will get (512<<overzoom)x(512<<overzoom)px tiles with a pixel ratio of 1.
When overzoom is combined with setScaledSize(), the base size is the overzoomed
tile size.
For a sample code see the [pbf2png](https://github.com/tumic0/pbf2png)
conversion utility.
## Styles
The map style is loaded from the
[$AppDataLocation](http://doc.qt.io/qt-5/qstandardpaths.html)/style/style.json