added rasterization for space -> tile transform

1 files changed, 15 insertions, 0 deletions

diff --git a/utils/raster.js b/utils/raster.js
new file mode 100644
index 0000000..44f4678
--- /dev/null
+++ b/utils/raster.js
@@ -0,0 +1,15 @@
+// Takes a space object and 'rasterizes' it into an object mapping of 8x16 tiles which may not be filled with empty space
+
+const ms = require('./measurespace');
+const vec = require('./vec');
+
+module.exports = function(space){
+  // just use .subsection
+  let tiles = {};
+  dim = ms(space).map(coord => vec.dot(coord,[1/8, 1/16])).map(tile => vec.elem(tile, [], a => Math.floor(a)));
+  for (let y=dim[0][0]; y<=dim[0][1]; y++) for (let x=dim[1][0]; x<=dim[1][1]; x++){
+    let tile = tileToChar([y,x]);
+    tiles[tile] = space.subsection(tile, vec.add(tile, [8,16]));
+  }
+  return tiles
+}