Add new parameter, OFFSET

Arduino/McLighting/McLighting.ino

@@ -256,6 +256,26 @@ void saveConfigCallback () {
   #include "custom_ws2812fx_animations.h" // Add animations in this file
 #endif
 
+#ifdef OFFSET
+void OffsetShow(void) {
+  static uint8_t tmpPixels[NUMLEDS * 4]; // allocate space for a copy of the ADafruit pixel data
+  uint8_t bytesPerPixel = strip->getNumBytes() / strip->getLength(); // 3=RGB, 4=RGBW
+
+  // copy the Adafruit pixel array
+  memcpy(tmpPixels, strip->getPixels(), strip->getNumBytes());
+
+  // offset the data in the Adafruit pixel array
+  memcpy(strip->getPixels() + OFFSET * bytesPerPixel, tmpPixels, (NUMLEDS - OFFSET) * bytesPerPixel);
+  memcpy(strip->getPixels(), tmpPixels + (NUMLEDS - OFFSET) * bytesPerPixel, OFFSET * bytesPerPixel);
+
+  // run the standard Adafruit show() function
+  strip->Adafruit_NeoPixel::show();
+
+  // copy the original pixel data back to the Adafruit pixel array
+  memcpy(strip->getPixels(), tmpPixels, strip->getNumBytes());
+}
+#endif
+
 // function to Initialize the strip
 void initStrip(uint16_t stripSize = WS2812FXStripSettings.stripSize, neoPixelType RGBOrder = WS2812FXStripSettings.RGBOrder, uint8_t pin = WS2812FXStripSettings.pin){
   if (strip) {
@@ -283,6 +303,10 @@ void initStrip(uint16_t stripSize = WS2812FXStripSettings.stripSize, neoPixelTyp
   // on a live circuit...if you must, connect GND first.
 
   strip->init();
+  #ifdef OFFSET
+  strip->setCustomShow(OffsetShow);
+  #endif
+
   #if defined(USE_WS2812FX_DMA) or defined(USE_WS2812FX_UART1) or defined(USE_WS2812FX_UART2)
     initDMA(stripSize);
     strip->setCustomShow(DMA_Show);

Arduino/McLighting/definitions.h

@@ -5,6 +5,8 @@
 // Neopixel
 #define LED_PIN 14       // LED_PIN (14 / D5) where neopixel / WS2811 strip is attached
 #define NUMLEDS 24       // Number of leds in the strip
+//
+//#define OFFSET         // If defined, first led of starting effect like dual scan,scan etc, is traslated of OFFSET number of leds. Not use this in conjuction of USE_WS2812FX_DMA,USE_WS2812FX_UART1 or USE_WS2812FX_UART2 
 //#define LED_TYPE_WS2811  // Uncomment if LED type uses 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
 #define BUILTIN_LED 2    // ESP-12F has the built in LED on GPIO2, see https://github.com/esp8266/Arduino/issues/2192
 #define BUTTON 4         // Input pin (4 / D2) for switching the LED strip on / off, connect this PIN to ground to trigger button.

README.md

@@ -1,5 +1,8 @@
 # McLighting v2 - The ESP8266 based multi-client lighting gadget
 
+This version, add ability to translate starting led of effect by OFFSET number of leds, respect of elettric wire of led strip.
+Thanks to @moose4lord
+
 [![Gitter](https://badges.gitter.im/mclighting/Lobby.svg)](https://gitter.im/mclighting/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [![Build Status](https://travis-ci.com/toblum/McLighting.svg?branch=master)](https://travis-ci.com/toblum/McLighting) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![version](https://img.shields.io/badge/version-v2.2.4-blue.svg)](https://github.com/toblum/McLighting/blob/master/Arduino/McLighting/version.h)
 
 McLighting (the multi-client lighting gadget) is a very cheap internet-controllable lighting solution based on the famous ESP8266 microcontroller and WS2811/2812 led strips. It features among other things a web-interface, a REST-API and a websocket connector.