From 21532c1ef886fa36879173e540cf8330800b1b36 Mon Sep 17 00:00:00 2001
From: Jane Petrovna <jane@j4.pm>
Date: Thu, 12 Nov 2020 04:48:19 -0500
Subject: [PATCH] t

---
 light_manager.py |  2 +-
 pattern.py       | 19 ++++++++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/light_manager.py b/light_manager.py
index 50eb6d0..897c19e 100644
--- a/light_manager.py
+++ b/light_manager.py
@@ -10,7 +10,7 @@ def defaultPattern(n, t, pv):
 
 
 class LightStrip:
-    def __init__(self, data_pin=board.D18, string_length=300, brightness=1, pixel_order=neopixel.GRB, max_changes=5):
+    def __init__(self, data_pin=board.D18, string_length=300, brightness=0.7, pixel_order=neopixel.GRB, max_changes=5):
         self.data_pin = data_pin
 
         self.np = neopixel.NeoPixel(
diff --git a/pattern.py b/pattern.py
index 2a65d73..78ecc3e 100644
--- a/pattern.py
+++ b/pattern.py
@@ -21,7 +21,9 @@ this.values = {
     "g": 0,
     "b": 0,
     "tick": 0,
-    "index": 0
+    "index": 0,
+    "fadeval": 0,
+    "fadeinc": True
 }
 
 
@@ -51,6 +53,20 @@ def mod(target, arg, index):
     return (target % arg, index)
 
 
+def fade(target, arg, index):
+    value = this.values['fadeval']
+    if this.values['fadeinc']:
+        value += 1
+        if value >= arg:
+            this.values['fadeinc'] = False
+    else:
+        value -= 1
+        if value <= 0:
+            this.values['fadeinc'] = True
+    this.values['fadeval'] = value
+    return (value, index)
+
+
 def rand(target, arg, index):
     return (random.randrange(0, 255), index)
 
@@ -110,6 +126,7 @@ this.instructions = {
     "MULTIPLY": mult,
     "DIVIDE": div,
     "MODULO": mod,
+    "FADE": fade,
     "RANDOM": rand,
     "JMP": jmp,
     "JNZ": jnz,