pichiwmap - WebGL WASM Map in Go

Requires a version of Go > 1.11beta1 (recommend build master from source)

An attempt to write a 2D/3D WebAssembly + WebGL "Slippy Map" for OpenStreetMap data (and other tile servers with the same tile structure).

Right this package is very experimental and most rendering logic is proof-of-concept in cmd/sample.

Done

• Basic map rendering sample (cmd/sample)
• Gesture / mouse panning and zooming
• Manual lat/lon/zoom entry
• Animtated keyboard panning
• Abstract the map logic from the rendering logic
  • Push all map logic into the "pichiwmap" package and a "pmwebgl" implementation of the renderer.
  • Make UX friendly (map, err := NewMap("divid"))

TODO

• Handle edge of the decidedly non-flat Earth.
• Implement concurrency protection (single thread != no race conditions :))
• Spike on vector tiles instead of (or in addition to) raster tiles.
• Refinement of cache/loading (on-going)
• Markers, polygons, etc.
• JavaScript hooks to allow non-wasm/go programmers to utilize the map

FUTURE

• 3D Elevation/terrain (this is why I'm using WebGL instead of canvas)
• 3D Tilt controls
• Leverage any future WASM / OpenGL native (non-javascript based) and other integrations
• Much more! (scope is not yet well defined)

Shout-outs

As early as Go+WASM is, I'm already standing on the shoulders of giants.

• Brian Ketelsen for the inspiration to try Go/WASM in the first place and much discussion of implementation
• Richard Musiol for making GopherJS and Go/WASM happen
• WebGL inspiration from https://github.com/stdiopt/gowasm-experiments
• WebGL is implemented with considerable help of WebGL Fundamentals. Particularly Draw Image
• Tile calculations, with the exception of layout ("TileFromCenter"), are a direct port of https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames).
• and more to come...