From 07d96b2e10353ac951b40f23e3dae2a80b8f1f85 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Sun, 26 Jan 2020 20:34:26 +0800
Subject: [PATCH] use scad

---
 src/pixel/_impl/_px_gray_impl.scad | 29 +++++++++++++++++++++++++++++
 src/pixel/px_gray.scad             | 29 ++---------------------------
 2 files changed, 31 insertions(+), 27 deletions(-)
 create mode 100644 src/pixel/_impl/_px_gray_impl.scad

diff --git a/src/pixel/_impl/_px_gray_impl.scad b/src/pixel/_impl/_px_gray_impl.scad
new file mode 100644
index 00000000..1da800fb
--- /dev/null
+++ b/src/pixel/_impl/_px_gray_impl.scad
@@ -0,0 +1,29 @@
+function _px_gray_row(r_count, row_bits, width, height, center, invert, normalize) =
+    let(
+        half_w = width / 2,
+        half_h = height / 2,
+        offset_x = center ? 0 : half_w,
+        offset_y = center ? -half_h : 0,
+        level = invert ? 0 : 255,
+        nmal = normalize ? 255 : 1
+    ) 
+    [
+        for(i = 0; i < width; i = i + 1) 
+            if(row_bits[i] != level) 
+                [
+                    [i - half_w + offset_x, r_count + offset_y], 
+                    invert ? row_bits[i] / nmal : (255 - row_bits[i]) / nmal
+                ]
+    ];
+
+function _px_gray_impl(levels, center, invert, normalize) = 
+    let(
+        width = len(levels[0]),
+        height = len(levels),
+        offset_i = height / 2
+    )
+    [
+        for(i = height - 1; i > -1; i = i - 1) 
+        let(row = _px_gray_row(height - i - 1, levels[i], width, height, center, invert, normalize))
+        if(row != []) each row
+    ];
\ No newline at end of file
diff --git a/src/pixel/px_gray.scad b/src/pixel/px_gray.scad
index acb9b701..9f6d7f29 100644
--- a/src/pixel/px_gray.scad
+++ b/src/pixel/px_gray.scad
@@ -8,32 +8,7 @@
 *
 **/ 
 
-function _px_gray_row(r_count, row_bits, width, height, center, invert, normalize) =
-    let(
-        half_w = width / 2,
-        half_h = height / 2,
-        offset_x = center ? 0 : half_w,
-        offset_y = center ? -half_h : 0,
-        level = invert ? 0 : 255,
-        nmal = normalize ? 255 : 1
-    ) 
-    [
-        for(i = 0; i < width; i = i + 1) 
-            if(row_bits[i] != level) 
-                [
-                    [i - half_w + offset_x, r_count + offset_y], 
-                    invert ? row_bits[i] / nmal : (255 - row_bits[i]) / nmal
-                ]
-    ];
+use <pixel/_impl/_px_gray_impl.scad>;
 
 function px_gray(levels, center = false, invert = false, normalize = false) = 
-    let(
-        width = len(levels[0]),
-        height = len(levels),
-        offset_i = height / 2
-    )
-    [
-        for(i = height - 1; i > -1; i = i - 1) 
-        let(row = _px_gray_row(height - i - 1, levels[i], width, height, center, invert, normalize))
-        if(row != []) each row
-    ];
\ No newline at end of file
+    _px_gray_impl(levels, center, invert, normalize);
\ No newline at end of file