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how vector maps work Vladimir Agafonkin 24.08.2016 GL
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the new era of interactive cartography
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raster tiles era
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OpenLayers 2
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vector maps era
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MAPS.ME
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GL
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open source
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platform for mobile devices and browsers
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based on open data
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why vector maps?
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smooth zoom and rotation
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perspective view, 3D capabilities
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data-driven styling
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full control over data presentation in real time
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any object on the map can be interactive
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performance: rendering millions of features
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simulation vs cartography?
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visual map editor
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mapbox.com/studio
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video on maps
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less bandwidth
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github.com/mapbox/ mapbox-gl-js (JS) github.com/mapbox/ mapbox-gl-native (C++14) iOS, Android, QT, OSX, Linux, Node
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why WebGL isn’t everywhere yet?
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developing a GL-based platform
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OpenGL — 3D API?
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OpenGL is a low-level 2D API
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OpenGL: a technology for drawing triangles really fast
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vertex shader transforms coordinates
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fragment shader transforms pixel color
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drawing lines
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anti-aliasing
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6 triangles
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vertex attributes
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2 triangles
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line joins & line caps
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drawing polygons
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triangulation
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github.com/mapbox/earcut (JS) github.com/mapbox/earcut.hpp (C++)
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drawing text
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font textures
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unicode-intervals /Arial Regular/0-255.pbf /Arial Regular/256-511.pbf /Arial Regular/512-767.pbf
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SDF signed distance fields
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mapbox/shelf-pack (JS) mapbox/shelf-pack-cpp (C++)
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mapbox/tiny-sdf
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icu4c C + Emscripten = JavaScript coming soon: WebAssembly github.com/mapbox/ mapbox-gl-rtl-text
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loading and processing data
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Protocol Buffers compact binary data serialization format
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/mapbox/pbf (JS) /mapbox/protozero (C++) Protocol Buffers
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3-4 times smaller than JSON (gzip) 6-7 times faster than JSON.parse
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github.com/mapbox/ vector-tile-spec
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placing labels
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github.com/mapbox/grid-index github.com/mourner/rbush
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dynamically loading 3rd-party data on the client
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mapbox/geojson-vt (JS) mapbox/geojson-vt-cpp (C++)
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point clustering
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mapbox/supercluster (JS) mapbox/supercluter-hpp (C++)
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main thread (UI) processing loading data web workers processing loading data processing loading data
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vector style specification
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github.com/mapbox/ mapbox-gl-style-spec
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mapbox.com/studio
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Mapbox GL Native C++11 + Android, iOS, macOS, Qt, Node bindings github.com/mapbox/ mapbox-gl-native
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rendering tests
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mapbox/mapbox-gl-test-suite
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mapbox/pixelmatch (JS) mapbox/pixelmatch-cpp (C++) screenshot comparison with anti-aliasing detection
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AppVeyor
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JS development tools ES6 + Bublé ESLint Tap + Nyc Browserify
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hey, what’s there on the server side?
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