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Leaflet, WebGL and the future of web mapping Vladimir Agafonkin 11.03.15
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Vladimir Agafonkin
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by far the most used open source map library
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creating a web map in 2008
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born against all odds
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no way you could do that
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You’re wasting time
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build an OPENLAYERS wrapper
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born as a protest against bloat, clutter and complexity
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top priorities: simplicity performance
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feature need complexity simplify
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1.0
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0.7 1.0-dev WTF yay!
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Leaflet 1.0 trap, episode 1 of many: flyover animations
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arbitrary animation curve fractional zoom
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fractional zoom: map.setZoom(12.67)
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arbitrary animation curve multi-zoom pyramid tile loading
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fractional zoom rewrite half of Leaflet code
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code refactoring
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CSS transitions: very fast, impossible to control precisely, still buggy
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frame by frame animations: full control, much slower
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significantly degrade Leaflet performance, or introduce confusing limitations, fragility and complexity by having two animation systems?
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sometimes browsers break
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sorry guys
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oh and did I mention Android?
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tweaking leaflet animations
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my map broke in IE7!!!
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tough problems, hard choices, uncertainty, constant stream of issues and support requests, lots of work
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feeling anxiety and guilt and pressure
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open source burnout
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vlad adds a feature to leaflet
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it’s a trap!
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Vlad retreats to his happy place
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RBush
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• rbush • earcut • simpleheat • simplify-js • geojson-vt • pbf • geobuf • suncalc • dead-simple-grid • bullshit.js
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war in ukraine
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father of twin girls
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0.7.3 — 1.0
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sharing the joy of successful refactoring
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animations & usability
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flyover animations
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much better tile loading (smoother, less flickering)
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much better panning inertia
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smoother zoom on iOS Safari
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popup fade out animation
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accessibility improvements
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vectors 2.0
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Use SVG & Canvas on the same map
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put vectors in custom panes
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huge SVG layers performance boost: adding ~3x faster, takes ~2.5 less memory
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huge Canvas layers performance boost: partial redraws, faster mouse events
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Canvas layers now retina-enabled
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solved all problems with MultiPolygon & MultiPolyline: no longer inherited from FeatureGroup
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Polyline & Polygon Centroids
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TileLayer
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TileLayer split into GridLayer & TileLayer
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GridLayer is the new TileLayer.Canvas
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Projections
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No hardcoded projection hacks, all centralized in CRS
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CRS defines everything: how tiles wrap, what are the bounds, distance measure, etc.
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Proj4Leaflet FTW
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Layers
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all layers now inherited from Layer class less code, more consistency, good for plugins
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Custom Pane Management
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ImageOverlay events
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other performance improvements
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much faster Layer construction (delegated DOM events and other optimizations)
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huge FeatureGroup performance boost due to better event propagation mechanism
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much better memory footprint for DOM & Leaflet events
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LatLng construction 8x faster
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obj.off(event, listener) 2x faster
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more stable: less freezes and race conditions
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…and many other bugfixes and improvements
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best of all? it got smaller!
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Uncompressed: 212.80 KB (-2910 bytes) Compressed: 120.17 KB (-2482 bytes) Gzipped: 32.79 KB (+18 bytes) master vs stable
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state of 1.0
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1.0 beta
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VLAD TRIES TO FINISH 1.0
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Leaflet’s neat, but Vlad, wouldn’t it be awesome to have rotation? ^___^
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Mapbox GL
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drawing a line in WebGL
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drawing a line in WebGL is a hard problem
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drawing a polygon in WebGL
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github.com/mapbox/earcut
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drawing a polygon in WebGL is a very hard problem
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drawing text in WebGL
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placing labels in Mapbox GL
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holy f***ing sh*t
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displaying GeoJSON in Mapbox GL
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github.com/mapbox/geojson-vt
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vlad tries to borrow Mapbox GL feature for leaflet
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Vlad, how about adding a WebGL renderer to Leaflet? ^___^
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meant to be simple
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Leaflet will remain the go-to mapping library: dead simple, easy to use, works on all platforms, tons of plugins, huge community, everyone knows it
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meant to be very complex, and push the boundaries of what’s possible Mapbox GL
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opposite sides of spectrum
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excited to be pushing both
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