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| -rw-r--r-- | src/renderer/tilehunt.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/renderer/tilehunt.rs b/src/renderer/tilehunt.rs index f44644b..55b30af 100644 --- a/src/renderer/tilehunt.rs +++ b/src/renderer/tilehunt.rs @@ -1,4 +1,9 @@ //! Actual rendering functions for tile hunts. +//! +//! This renders a tile as "transparent green" if any track passes through it. +//! +//! Note that is version of "tile hunt" is a bit silly, as the tile size changes with the zoom +//! level. For a better version, the "tile hunt size" should be fixed to a given zoom. use color_eyre::eyre::Result; use crossbeam_channel::Sender; use fnv::FnvHashSet; @@ -35,6 +40,9 @@ impl super::Renderer for Renderer { } fn colorize(layer: Self::Prepared, tx: Sender<RenderedTile>) -> Result<()> { + // The tile is hand-crafted to be very small. See + // <https://www.mjt.me.uk/posts/smallest-png/> for a reference, and of course the actual + // PNG specification <http://www.libpng.org/pub/png/spec/1.2/PNG-Contents.html>. static IMAGE_DATA: &[u8] = include_bytes!("tile-marked.png"); for (tile_x, tile_y) in layer { tx.send(RenderedTile { |