From e3ac8d6ba0ae0a7bc93fea88363af4c65b469459 Mon Sep 17 00:00:00 2001
From: Justin Lin <justin.sdk@gmail.com>
Date: Wed, 18 Nov 2020 17:37:24 +0800
Subject: [PATCH] add mz_initialize

---
 src/maze/_impl/_mz_initialize.scad | 39 ++++++++++++++++++++++++++++++
 src/maze/mz_initialize.scad        |  4 +++
 2 files changed, 43 insertions(+)
 create mode 100644 src/maze/_impl/_mz_initialize.scad
 create mode 100644 src/maze/mz_initialize.scad

diff --git a/src/maze/_impl/_mz_initialize.scad b/src/maze/_impl/_mz_initialize.scad
new file mode 100644
index 00000000..4cb3feb1
--- /dev/null
+++ b/src/maze/_impl/_mz_initialize.scad
@@ -0,0 +1,39 @@
+
+use <_mz_comm.scad>;
+
+// create a starting maze for being visited later.
+function _rc_maze(rows, columns) =  [
+    for(y = [1:rows]) 
+        for(x = [1:columns]) 
+            block(
+                x, y, 
+                // all blocks have top and right walls
+                3, 
+                // unvisited
+                false 
+            )
+];
+
+function _mz_mask(mask) = 
+    let(
+        rows = len(mask),
+        columns = len(mask[0])
+    )
+    [
+        for(y = [1:rows])
+            for(x = [1:columns])
+                mask[rows - y][x - 1] == 0 ?
+                    block(
+                        x, y, 						
+                        4, // mask
+                        true // visited
+                    )
+                    :
+                    block(
+                        x, y, 
+                        // all blocks have top and right walls
+                        3, 
+                        // unvisited
+                        false 
+                    )
+    ];
\ No newline at end of file
diff --git a/src/maze/mz_initialize.scad b/src/maze/mz_initialize.scad
new file mode 100644
index 00000000..0d3f3589
--- /dev/null
+++ b/src/maze/mz_initialize.scad
@@ -0,0 +1,4 @@
+use <_impl/_mz_initialize.scad>;
+
+function mz_initialize(row, columns, mask) = 
+    is_undef(mask) ? _rc_maze(rows, columns) : _mz_mask(mask);
\ No newline at end of file