Lighting now uses pathing to determine where it can go, but _distance_ to determin strength. Looks way better.

matrix.hpp

@@ -37,6 +37,8 @@ namespace matrix {
   };
 
   struct in_box {
+    size_t from_x;
+    size_t from_y;
     size_t x = 0; // these are set in constructor
     size_t y = 0; // again, no fancy ~ trick needed
     size_t left = 0;
@@ -45,6 +47,7 @@ namespace matrix {
     size_t bottom = 0;
 
     in_box(Matrix &mat, size_t x, size_t y, size_t size);
+    float distance();
     bool next();
     void dump();
   };