added rasterization for space -> tile transform

2 files changed, 19 insertions, 3 deletions

diff --git a/space.js b/space.js
index d4e4567..d7f68e8 100644
--- a/space.js
+++ b/space.js
@@ -134,10 +134,11 @@ function Space(){
   this.subsection = function(range){ // range is a coordinate pair
     // Similarly excludes this.loc
     newspace = new Space();
-    for (let line=range[0][0]; line<=range[1][0]; line++){
+    for (let line=range[0][0]; line<range[1][0]; line++){
       newspace.data.push([]);
-      for (let chr=range[0][1]; chr<=range[1][1]; chr++){
-        newspace.data[line-range[0][0]].push(this.data[line][chr] || '');
+      let thisline = this.data[line] || [];
+      for (let chr=range[0][1]; chr<range[1][1]; chr++){
+        newspace.data[line-range[0][0]].push(thisline[chr] || '');
       }
     }
     return newspace;
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
+}