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Diffstat (limited to 'src/mbgl/map/transform_state.cpp')
-rw-r--r-- | src/mbgl/map/transform_state.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/mbgl/map/transform_state.cpp b/src/mbgl/map/transform_state.cpp index 18d2c24aee..a85b251fb4 100644 --- a/src/mbgl/map/transform_state.cpp +++ b/src/mbgl/map/transform_state.cpp @@ -421,4 +421,17 @@ float TransformState::getCameraToTileDistance(const UnwrappedTileID& tileID) con return projectedCenter[3]; } +float TransformState::maxPitchScaleFactor() const { + if (size.isEmpty()) { + return {}; + } + auto latLng = screenCoordinateToLatLng({ 0, static_cast<float>(getSize().height) }); + mat4 mat = coordinatePointMatrix(getZoom()); + Point<double> pt = Projection::project(latLng, scale) / double(util::tileSize); + vec4 p = {{ pt.x, pt.y, 0, 1 }}; + vec4 topPoint; + matrix::transformMat4(topPoint, p, mat); + return topPoint[3] / getCameraToCenterDistance(); +} + } // namespace mbgl |