| 1 | #pragma once |
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| 2 | |
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| 3 | #include <mapbox/geojsonvt/clip.hpp> |
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| 4 | #include <mapbox/geojsonvt/types.hpp> |
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| 5 | |
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| 6 | namespace mapbox { |
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| 7 | namespace geojsonvt { |
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| 8 | namespace detail { |
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| 9 | |
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| 10 | inline void shiftCoords(vt_features& features, double offset) { |
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| 11 | for (auto& feature : features) { |
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| 12 | mapbox::geometry::for_each_point(geom&: feature.geometry, |
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| 13 | f: [offset](vt_point& point) { point.x += offset; }); |
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| 14 | feature.bbox.min.x += offset; |
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| 15 | feature.bbox.max.x += offset; |
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| 16 | } |
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| 17 | } |
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| 18 | |
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| 19 | inline vt_features wrap(const vt_features& features, double buffer) { |
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| 20 | // left world copy |
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| 21 | auto left = clip<0>(features, k1: -1 - buffer, k2: buffer, minAll: -1, maxAll: 2); |
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| 22 | // right world copy |
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| 23 | auto right = clip<0>(features, k1: 1 - buffer, k2: 2 + buffer, minAll: -1, maxAll: 2); |
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| 24 | |
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| 25 | if (left.empty() && right.empty()) |
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| 26 | return features; |
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| 27 | |
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| 28 | // center world copy |
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| 29 | auto merged = clip<0>(features, k1: -buffer, k2: 1 + buffer, minAll: -1, maxAll: 2); |
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| 30 | |
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| 31 | if (!left.empty()) { |
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| 32 | // merge left into center |
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| 33 | shiftCoords(features&: left, offset: 1.0); |
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| 34 | merged.insert(position: merged.begin(), first: left.begin(), last: left.end()); |
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| 35 | } |
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| 36 | if (!right.empty()) { |
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| 37 | // merge right into center |
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| 38 | shiftCoords(features&: right, offset: -1.0); |
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| 39 | merged.insert(position: merged.end(), first: right.begin(), last: right.end()); |
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| 40 | } |
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| 41 | return merged; |
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| 42 | } |
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| 43 | |
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| 44 | } // namespace detail |
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| 45 | } // namespace geojsonvt |
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| 46 | } // namespace mapbox |
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| 47 | |
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