externalized charToTile component of raster

1 files changed, 3 insertions, 0 deletions

diff --git a/utils/vec.js b/utils/vec.js
index d595989..57104df 100644
--- a/utils/vec.js
+++ b/utils/vec.js
@@ -33,6 +33,9 @@ exports.dot = function(orig,vec){
 exports.tileToChar = function(orig){
   return exports.dot(orig, [8,16]);
 }
+exports.charToTile = function(orig){
+  return exports.elem(exports.dot(orig, [1/8, 1/16]), [], a => Math.floor(a));
+}
 exports.norm = function(orig){
   let sum = orig.reduce( (acc, cur) => acc+cur );
   return exports.dot(orig, 1/sum);