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author | Ansis Brammanis <brammanis@gmail.com> | 2015-02-10 12:52:53 -0800 |
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committer | Ansis Brammanis <brammanis@gmail.com> | 2015-02-10 15:21:18 -0800 |
commit | 8e459c2a73e7dcdb4cf660cfe61d5c945d7a2513 (patch) | |
tree | 0f0d699078fbccb17afc49dc0007891fbb402bd1 /src | |
parent | fdcd1b888bf81a2421992b1a01c16606c858f55f (diff) | |
download | qtlocation-mapboxgl-8e459c2a73e7dcdb4cf660cfe61d5c945d7a2513.tar.gz |
improve line label density
Place the first label as close to the beginning of the line as possible.
js: 316ed0bd9bff8cd430ad81d0b6397f396fbce124
Diffstat (limited to 'src')
-rw-r--r-- | src/mbgl/geometry/resample.cpp | 7 | ||||
-rw-r--r-- | src/mbgl/geometry/resample.hpp | 2 | ||||
-rw-r--r-- | src/mbgl/renderer/symbol_bucket.cpp | 19 |
3 files changed, 23 insertions, 5 deletions
diff --git a/src/mbgl/geometry/resample.cpp b/src/mbgl/geometry/resample.cpp index abb3ef1e3c..2fd4a8fd88 100644 --- a/src/mbgl/geometry/resample.cpp +++ b/src/mbgl/geometry/resample.cpp @@ -17,17 +17,18 @@ const std::array<std::vector<float>, 4> minScaleArrays = {{ Anchors resample(const std::vector<Coordinate> &vertices, float spacing, const float /*minScale*/, float maxScale, const float tilePixelRatio, - const int start) { + int offset) { maxScale = std::round(std::fmax(std::fmin(8.0f, maxScale / 2.0f), 1.0f)); spacing *= tilePixelRatio / maxScale; + offset *= tilePixelRatio / maxScale; const size_t index = util::clamp<size_t>(std::floor(std::log(maxScale) / std::log(2)), 0, minScaleArrays.size() - 1); const std::vector<float> &minScales = minScaleArrays[index]; const size_t len = minScales.size(); - float distance = 0.0f; + float distance = spacing - offset;; float markedDistance = 0.0f; - int added = start; + int added = 0; Anchors points; diff --git a/src/mbgl/geometry/resample.hpp b/src/mbgl/geometry/resample.hpp index bcfe4ca53d..febb6360d5 100644 --- a/src/mbgl/geometry/resample.hpp +++ b/src/mbgl/geometry/resample.hpp @@ -7,7 +7,7 @@ namespace mbgl { Anchors resample(const std::vector<Coordinate> &vertices, float spacing, - float minScale, float maxScale, float tilePixelRatio, int start = 0); + float minScale, float maxScale, float tilePixelRatio, int offset); } #endif diff --git a/src/mbgl/renderer/symbol_bucket.cpp b/src/mbgl/renderer/symbol_bucket.cpp index f53bbfa954..9d9636b399 100644 --- a/src/mbgl/renderer/symbol_bucket.cpp +++ b/src/mbgl/renderer/symbol_bucket.cpp @@ -238,9 +238,26 @@ void SymbolBucket::addFeature(const std::vector<Coordinate> &line, const Shaping Anchors anchors; if (properties.placement == PlacementType::Line) { + float textResampleOffset = 0; + float iconResampleOffset = 0; + + if (shaping.size()) { + float minX = std::numeric_limits<float>::infinity(); + float maxX = -std::numeric_limits<float>::infinity(); + for (const auto &glyph : shaping) { + minX = std::min(minX, glyph.x); + maxX = std::max(maxX, glyph.x); + } + const float labelLength = maxX - minX; + textResampleOffset = (labelLength / 2.0 + glyphSize) * fontScale; + } + if (image) { + iconResampleOffset = image.w; + } + // Line labels anchors = resample(line, properties.min_distance, minScale, collision.maxPlacementScale, - collision.tilePixelRatio); + collision.tilePixelRatio, std::max(iconResampleOffset, textResampleOffset)); // Sort anchors by segment so that we can start placement with the // anchors that can be shown at the lowest zoom levels. |