From cb0452964e13a9a44d1e688f9f1f8275b15896b5 Mon Sep 17 00:00:00 2001
From: fishbone-git <kevindf@gmail.com>
Date: Tue, 18 Feb 2020 21:28:46 +0100
Subject: [PATCH] bidirectional running lights effect

---
 wled00/FX.cpp | 18 ++++++++++++++++--
 wled00/FX.h   | 11 +++++++----
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/wled00/FX.cpp b/wled00/FX.cpp
index eb043522..bbc63cc4 100644
--- a/wled00/FX.cpp
+++ b/wled00/FX.cpp
@@ -426,13 +426,15 @@ uint16_t WS2812FX::mode_theater_chase_rainbow(void) {
 /*
  * Running lights effect with smooth sine transition base.
  */
-uint16_t WS2812FX::running_base(bool saw) {
+uint16_t WS2812FX::running_base(bool saw, bool dual=false) {
   uint8_t x_scale = SEGMENT.intensity >> 2;
   uint32_t counter = (now * SEGMENT.speed) >> 9;
 
   for(uint16_t i = 0; i < SEGLEN; i++) {
     uint8_t s = 0;
+    uint8_t t = 0;
     uint8_t a = i*x_scale - counter;
+    uint8_t b = (SEGLEN-1-i)*x_scale - counter;
     if (saw) {
       if (a < 16)
       {
@@ -442,12 +444,24 @@ uint16_t WS2812FX::running_base(bool saw) {
       }
     }
     s = sin8(a);
-    setPixelColor(i, color_blend(color_from_palette(i, true, PALETTE_SOLID_WRAP, 0), SEGCOLOR(1), s));
+    t = sin8(b);
+    uint32_t ca = color_blend(color_from_palette(i, true, PALETTE_SOLID_WRAP, 0), SEGCOLOR(1), s);
+    uint32_t cb = color_blend(color_from_palette(i, true, PALETTE_SOLID_WRAP, 2), SEGCOLOR(1), t);
+    uint32_t cl = dual ? color_blend(ca, cb, 127) : ca;
+    setPixelColor(i, cl);
   }
   return FRAMETIME;
 }
 
 
+/*
+ * Running lights in opposite directions.
+ */
+uint16_t WS2812FX::mode_running_dual(void) {
+  return running_base(false, true);
+}
+
+
 /*
  * Running lights effect with smooth sine transition.
  */
diff --git a/wled00/FX.h b/wled00/FX.h
index abfc11d3..1efbb59b 100644
--- a/wled00/FX.h
+++ b/wled00/FX.h
@@ -91,7 +91,7 @@
 #define IS_REVERSE      ((SEGMENT.options & REVERSE )     == REVERSE     )
 #define IS_SELECTED     ((SEGMENT.options & SELECTED)     == SELECTED    )
 
-#define MODE_COUNT  101
+#define MODE_COUNT  102
 
 #define FX_MODE_STATIC                   0
 #define FX_MODE_BLINK                    1
@@ -194,6 +194,7 @@
 #define FX_MODE_PERCENT                 98
 #define FX_MODE_RIPPLE_RAINBOW          99
 #define FX_MODE_HEARTBEAT              100
+#define FX_MODE_RUNNING_DUAL           101
 
 class WS2812FX {
   typedef uint16_t (WS2812FX::*mode_ptr)(void);
@@ -383,6 +384,7 @@ class WS2812FX {
       _mode[FX_MODE_PERCENT]                 = &WS2812FX::mode_percent;
       _mode[FX_MODE_RIPPLE_RAINBOW]          = &WS2812FX::mode_ripple_rainbow;
       _mode[FX_MODE_HEARTBEAT]               = &WS2812FX::mode_heartbeat;
+      _mode[FX_MODE_RUNNING_DUAL]            = &WS2812FX::mode_running_dual;
 
       _brightness = DEFAULT_BRIGHTNESS;
       currentPalette = CRGBPalette16(CRGB::Black);
@@ -568,7 +570,8 @@ class WS2812FX {
       mode_plasma(void),
       mode_percent(void),
       mode_ripple_rainbow(void),
-      mode_heartbeat(void);
+      mode_heartbeat(void),
+      mode_running_dual(void);
       
 
   private:
@@ -607,7 +610,7 @@ class WS2812FX {
       color_wipe(bool, bool),
       scan(bool),
       theater_chase(uint32_t, uint32_t, bool),
-      running_base(bool),
+      running_base(bool,bool),
       larson_scanner(bool),
       sinelon_base(bool,bool),
       dissolve(uint32_t),
@@ -650,7 +653,7 @@ const char JSON_mode_names[] PROGMEM = R"=====([
 "Noise 1","Noise 2","Noise 3","Noise 4","Colortwinkles","Lake","Meteor","Meteor Smooth","Railway","Ripple",
 "Twinklefox","Twinklecat","Halloween Eyes","Solid Pattern","Solid Pattern Tri","Spots","Spots Fade","Glitter","Candle","Fireworks Starburst",
 "Fireworks 1D","Bouncing Balls","Sinelon","Sinelon Dual","Sinelon Rainbow","Popcorn","Drip","Plasma","Percent","Ripple Rainbow",
-"Heartbeat"
+"Heartbeat","Running Dual"
 ])=====";