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| author | Paolo Angelelli <paolo.angelelli@qt.io> | 2019-01-30 20:59:59 +0100 |
|---|---|---|
| committer | Paolo Angelelli <paolo.angelelli@qt.io> | 2019-03-11 12:10:54 +0000 |
| commit | a52dae6a79c1c19ee2391037cfdc6d557381bb88 (patch) | |
| tree | 0308df23ee4097132a8dc34a05ea326bb9adda58 /src/positioning | |
| parent | b1f6028c2aba51b898ce380f7b584ae603a06382 (diff) | |
| download | qtlocation-a52dae6a79c1c19ee2391037cfdc6d557381bb88.tar.gz | |
Introduce Qt.labs.location QtLocationLabs singleton type
This singleton is meant to offer tech-preview map-related API.
It starts with a mapObjectsAt invokable, that can be used to probe
MapObjects at a specific coordinate of a map.
Reference implementation for Q*ObjectQSG, based on QGeoShape::contains,
included.
Change-Id: Ief692eb5a43115ca02d4642c82023d1b2e217400
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
Diffstat (limited to 'src/positioning')
| -rw-r--r-- | src/positioning/qlocationutils_p.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/positioning/qlocationutils_p.h b/src/positioning/qlocationutils_p.h index d9e6524a..e3881f6f 100644 --- a/src/positioning/qlocationutils_p.h +++ b/src/positioning/qlocationutils_p.h @@ -229,7 +229,7 @@ public: return 6371007.2; } - inline static double earthMeanDiameter() + inline static double earthMeanCircumference() { return earthMeanRadius() * 2.0 * M_PI; } @@ -256,6 +256,12 @@ public: return wrapLong(centerLongitude - leftOffset); } + static qreal metersPerPixel(qreal zoomLevel, const QGeoCoordinate &coordinate) + { + const qreal metersPerTile = earthMeanCircumference() * std::cos(radians(coordinate.latitude())) / std::pow(2, zoomLevel); + return metersPerTile / 256.0; + } + /* returns the NMEA sentence type. */ |