Add texture bias option

Readme.md

@@ -64,9 +64,15 @@ const maze = generator(8, 4, false);
 // Width == 8, height == 4, maze edges are closed, using random seed 
 const maze = generator(8, 4, true, 123456);
 
-```
+// Width == 8, height == 8, edges are open, default seed 1
+// and texture == 0.9 (very horizontal maze)
+const maze = generator(8, 8, false, 1, 0.9);
 
+// Width == 8, height == 8, edges are open, default seed 1
+// and texture == 0.1 (very vertical maze)
+const maze = generator(8, 8, false, 1, 0.1);
 
+```
 
 _Note: the maze is an array of rows, so to access individual cells by their x/y
 positions, you need to specify the row first.  For example:

src/generate-maze.ts

@@ -112,7 +112,7 @@ function addSetExits(row: Cell[], nextRow: Cell[], random: () => number) {
   });
 }
 
-function generate(width = 8, height = width, closed = true, seed = 1) {
+function generate(width = 8, height = width, closed = true, seed = 1, texture = 0.5) {
   const random = mulberry32(seed);
   const maze = [];
   const r = range(width);
@@ -135,7 +135,7 @@ function generate(width = 8, height = width, closed = true, seed = 1) {
   // All rows except last:
   initial(maze).forEach((row, y) => { // TODO initial temp?
     populateMissingSets(row, random);
-    mergeRandomSetsIn(row, random);
+    mergeRandomSetsIn(row, random, texture);
     addSetExits(row, maze[y + 1], random);
   });