WS2812FX.cpp

/*
  WS2812FX.cpp - Library for WS2812 LED effects.

  Harm Aldick - 2016
  www.aldick.org


  FEATURES
    * A lot of blinken modes and counting
    * WS2812FX can be used as drop-in replacement for Adafruit Neopixel Library

  NOTES
    * Uses the Adafruit Neopixel library. Get it here: 
      https://github.com/adafruit/Adafruit_NeoPixel



  LICENSE

  The MIT License (MIT)

  Copyright (c) 2016  Harm Aldick 

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.


  CHANGELOG

  2016-05-28   Initial beta release
  2016-06-03   Code cleanup, minor improvements, new modes
  2016-06-04   2 new fx, fixed setColor (now also resets _mode_color)
  2017-02-02   added external trigger functionality (e.g. for sound-to-light)
  2017-02-02   removed "blackout" on mode, speed or color-change

*/

#include "Arduino.h"
#include "WS2812FX.h"

#define CALL_MODE(n) (this->*_mode[n])();

void WS2812FX::init() {
  Adafruit_NeoPixel::begin();
  WS2812FX::setBrightness(_brightness);
  Adafruit_NeoPixel::show();
}

void WS2812FX::service() {
  if(_running || _triggered) {
    unsigned long now = millis();

    if(now - _mode_last_call_time > _mode_delay || _triggered) {
      CALL_MODE(_mode_index);
      _counter_mode_call++;
      _mode_last_call_time = now;
      _triggered = false;
    }
  }
}

void WS2812FX::start() {
  _counter_mode_call = 0;
  _counter_mode_step = 0;
  _mode_last_call_time = 0;
  _running = true;
}

void WS2812FX::stop() {
  _running = false;
  strip_off();
}

void WS2812FX::trigger() {
  _triggered = true;
}

void WS2812FX::setMode(uint8_t m) {
  _counter_mode_call = 0;
  _counter_mode_step = 0;
  _mode_last_call_time = 0;
  _mode_index = constrain(m, 0, MODE_COUNT-1);
  _mode_color = _color;
  Adafruit_NeoPixel::setBrightness(_brightness);
  //strip_off();
}

void WS2812FX::setSpeed(uint8_t s) {
  _counter_mode_call = 0;
  _counter_mode_step = 0;
  _mode_last_call_time = 0;
  _speed = constrain(s, SPEED_MIN, SPEED_MAX);
  //strip_off();
}

void WS2812FX::increaseSpeed(uint8_t s) {
  s = constrain(_speed + s, SPEED_MIN, SPEED_MAX);
  setSpeed(s);
}

void WS2812FX::decreaseSpeed(uint8_t s) {
  s = constrain(_speed - s, SPEED_MIN, SPEED_MAX);
  setSpeed(s);
}

void WS2812FX::setColor(uint8_t r, uint8_t g, uint8_t b) {
  setColor(((uint32_t)r << 16) | ((uint32_t)g << 8) | b);
}

void WS2812FX::setColor(uint32_t c) {
  _color = c;
  _counter_mode_call = 0;
  _counter_mode_step = 0;
  _mode_last_call_time = 0;
  _mode_color = _color;
  Adafruit_NeoPixel::setBrightness(_brightness);
  //strip_off();
}

void WS2812FX::setBrightness(uint8_t b) {
  _brightness = constrain(b, BRIGHTNESS_MIN, BRIGHTNESS_MAX);
  Adafruit_NeoPixel::setBrightness(_brightness);
  Adafruit_NeoPixel::show();
}

void WS2812FX::increaseBrightness(uint8_t s) {
  s = constrain(_brightness + s, BRIGHTNESS_MIN, BRIGHTNESS_MAX);
  setBrightness(s);
}

void WS2812FX::decreaseBrightness(uint8_t s) {
  s = constrain(_brightness - s, BRIGHTNESS_MIN, BRIGHTNESS_MAX);
  setBrightness(s);
}

boolean WS2812FX::isRunning() {
  return _running; 
}

uint8_t WS2812FX::getMode(void) {
  return _mode_index;
}

uint8_t WS2812FX::getSpeed(void) {
  return _speed;
}

uint8_t WS2812FX::getBrightness(void) {
  return _brightness;
}

uint8_t WS2812FX::getModeCount(void) {
  return MODE_COUNT;
}

uint32_t WS2812FX::getColor(void) {
  return _color; 
}

const char* WS2812FX::getModeName(uint8_t m) {
  if(m < MODE_COUNT) {
    return _name[m];
  } else {
    return "";
  }
}

/* #####################################################
#
#  Color and Blinken Functions
#
##################################################### */

/*
 * Turns everything off. Doh.
 */
void WS2812FX::strip_off() {
  Adafruit_NeoPixel::clear();
  Adafruit_NeoPixel::show();
}


/*
 * Put a value 0 to 255 in to get a color value.
 * The colours are a transition r -> g -> b -> back to r
 * Inspired by the Adafruit examples.
 */
uint32_t WS2812FX::color_wheel(uint8_t pos) {
  pos = 255 - pos;
  if(pos < 85) {
    return ((uint32_t)(255 - pos * 3) << 16) | ((uint32_t)(0) << 8) | (pos * 3);
  } else if(pos < 170) {
    pos -= 85;
    return ((uint32_t)(0) << 16) | ((uint32_t)(pos * 3) << 8) | (255 - pos * 3);
  } else {
    pos -= 170;
    return ((uint32_t)(pos * 3) << 16) | ((uint32_t)(255 - pos * 3) << 8) | (0);
  }
}


/*
 * Returns a new, random wheel index with a minimum distance of 42 from pos.
 */
uint8_t WS2812FX::get_random_wheel_index(uint8_t pos) {
  uint8_t r = 0;
  uint8_t x = 0;
  uint8_t y = 0;
  uint8_t d = 0;

  while(d < 42) {
    r = random(256);
    x = abs(pos - r);
    y = 255 - x;
    d = min(x, y);
  }

  return r;
}


/*
 * No blinking. Just plain old static light.
 */
void WS2812FX::mode_static(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);
  }
  Adafruit_NeoPixel::show();

  _mode_delay = 50;
}


/*
 * Normal blinking. 50% on/off time.
 */
void WS2812FX::mode_blink(void) {
  if(_counter_mode_call % 2 == 1) {
    for(uint16_t i=0; i < _led_count; i++) {
      Adafruit_NeoPixel::setPixelColor(i, _color);
    }
    Adafruit_NeoPixel::show();
  } else {
    strip_off();
  }

  _mode_delay = 100 + ((1986 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Lights all LEDs after each other up. Then turns them in
 * that order off. Repeat.
 */
void WS2812FX::mode_color_wipe(void) {
  if(_counter_mode_step < _led_count) {
    Adafruit_NeoPixel::setPixelColor(_counter_mode_step, _color);
  } else {
    Adafruit_NeoPixel::setPixelColor(_counter_mode_step - _led_count, 0);
  }
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % (_led_count * 2);

  _mode_delay = 5 + ((50 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Turns all LEDs after each other to a random color.
 * Then starts over with another color.
 */
void WS2812FX::mode_color_wipe_random(void) {
  if(_counter_mode_step == 0) {
    _mode_color = get_random_wheel_index(_mode_color);
  }

  Adafruit_NeoPixel::setPixelColor(_counter_mode_step, color_wheel(_mode_color));
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;

  _mode_delay = 5 + ((50 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Lights all LEDs in one random color up. Then switches them
 * to the next random color.
 */
void WS2812FX::mode_random_color(void) {
  _mode_color = get_random_wheel_index(_mode_color);

  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color_wheel(_mode_color));
  }
  
  Adafruit_NeoPixel::show();
  _mode_delay = 100 + ((5000 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Lights every LED in a random color. Changes one random LED after the other
 * to another random color.
 */
void WS2812FX::mode_single_dynamic(void) {
  if(_counter_mode_call == 0) {
    for(uint16_t i=0; i < _led_count; i++) {
      Adafruit_NeoPixel::setPixelColor(i, color_wheel(random(256)));
    }
  }

  Adafruit_NeoPixel::setPixelColor(random(_led_count), color_wheel(random(256)));
  Adafruit_NeoPixel::show();
  _mode_delay = 10 + ((5000 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Lights every LED in a random color. Changes all LED at the same time
 * to new random colors.
 */
void WS2812FX::mode_multi_dynamic(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color_wheel(random(256)));
  }
  Adafruit_NeoPixel::show();
  _mode_delay = 100 + ((5000 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Does the "standby-breathing" of well known i-Devices. Fixed Speed.
 * Use mode "fade" if you like to have something similar with a different speed.
 */
void WS2812FX::mode_breath(void) {
  //                                      0    1    2   3   4   5   6    7   8   9  10  11   12   13   14   15   16    // step
  uint16_t breath_delay_steps[] =     {   7,   9,  13, 15, 16, 17, 18, 930, 19, 18, 15, 13,   9,   7,   4,   5,  10 }; // magic numbers for breathing LED
  uint8_t breath_brightness_steps[] = { 150, 125, 100, 75, 50, 25, 16,  15, 16, 25, 50, 75, 100, 125, 150, 220, 255 }; // even more magic numbers!

  if(_counter_mode_call == 0) {
    _mode_color = breath_brightness_steps[0] + 1;
  }

  uint8_t breath_brightness = _mode_color; // we use _mode_color to store the brightness

  if(_counter_mode_step < 8) {
    breath_brightness--;
  } else {
    breath_brightness++;
  }

  // update index of current delay when target brightness is reached, start over after the last step
  if(breath_brightness == breath_brightness_steps[_counter_mode_step]) {
    _counter_mode_step = (_counter_mode_step + 1) % (sizeof(breath_brightness_steps)/sizeof(uint8_t));
  }
  
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);           // set all LEDs to selected color
  }
  int b = map(breath_brightness, 0, 255, 0, _brightness);  // keep brightness below brightness set by user
  Adafruit_NeoPixel::setBrightness(b);                     // set new brightness to leds
  Adafruit_NeoPixel::show();

  _mode_color = breath_brightness;                         // we use _mode_color to store the brightness
  _mode_delay = breath_delay_steps[_counter_mode_step];
}


/*
 * Fades the LEDs on and (almost) off again.
 */
void WS2812FX::mode_fade(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);
  }

  int b = _counter_mode_step - 127;
  b = 255 - (abs(b) * 2);
  b = map(b, 0, 255, min(25, _brightness), _brightness);
  Adafruit_NeoPixel::setBrightness(b);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % 256;
  _mode_delay = 5 + ((15 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Runs a single pixel back and forth.
 */
void WS2812FX::mode_scan(void) {
  if(_counter_mode_step > (_led_count*2) - 2) {
    _counter_mode_step = 0;
  }
  _counter_mode_step++;

  int i = _counter_mode_step - (_led_count - 1);
  i = abs(i);

  Adafruit_NeoPixel::clear();
  Adafruit_NeoPixel::setPixelColor(abs(i), _color);
  Adafruit_NeoPixel::show();

  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Runs two pixel back and forth in opposite directions.
 */
void WS2812FX::mode_dual_scan(void) {
  if(_counter_mode_step > (_led_count*2) - 2) {
    _counter_mode_step = 0;
  }
  _counter_mode_step++;

  int i = _counter_mode_step - (_led_count - 1);
  i = abs(i);

  Adafruit_NeoPixel::clear();
  Adafruit_NeoPixel::setPixelColor(i, _color);
  Adafruit_NeoPixel::setPixelColor(_led_count - (i+1), _color);
  Adafruit_NeoPixel::show();

  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Cycles all LEDs at once through a rainbow.
 */
void WS2812FX::mode_rainbow(void) {
  uint32_t color = color_wheel(_counter_mode_step);
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color);
  }
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % 256;

  _mode_delay = 1 + ((50 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Cycles a rainbow over the entire string of LEDs.
 */
void WS2812FX::mode_rainbow_cycle(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color_wheel(((i * 256 / _led_count) + _counter_mode_step) % 256));
  }
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % 256;

  _mode_delay = 1 + ((50 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Theatre-style crawling lights.
 * Inspired by the Adafruit examples.
 */
void WS2812FX::mode_theater_chase(void) {
  uint8_t j = _counter_mode_call % 6;
  if(j % 2 == 0) {
    for(uint16_t i=0; i < _led_count; i=i+3) {
      Adafruit_NeoPixel::setPixelColor(i+(j/2), _color);
    }
    Adafruit_NeoPixel::show();
    _mode_delay = 50 + ((500 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
  } else {
    for(uint16_t i=0; i < _led_count; i=i+3) {
      Adafruit_NeoPixel::setPixelColor(i+(j/2), 0);
    }
    _mode_delay = 1;
  }
}


/*
 * Theatre-style crawling lights with rainbow effect.
 * Inspired by the Adafruit examples.
 */
void WS2812FX::mode_theater_chase_rainbow(void) {
  uint8_t j = _counter_mode_call % 6;
  if(j % 2 == 0) {
    for(uint16_t i=0; i < _led_count; i=i+3) {
      Adafruit_NeoPixel::setPixelColor(i+(j/2), color_wheel((i+_counter_mode_step) % 256));
    }
    Adafruit_NeoPixel::show();
    _mode_delay = 50 + ((500 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
  } else {
    for(uint16_t i=0; i < _led_count; i=i+3) {
      Adafruit_NeoPixel::setPixelColor(i+(j/2), 0);
    }
    _mode_delay = 1;
  }
  _counter_mode_step = (_counter_mode_step + 1) % 256;
}


/*
 * Running lights effect with smooth sine transition.
 */
void WS2812FX::mode_running_lights(void) {
  uint8_t r = ((_color >> 16) & 0xFF);
  uint8_t g = ((_color >> 8) & 0xFF);
  uint8_t b = (_color & 0xFF);

  for(uint16_t i=0; i < _led_count; i++) {
    int s = (sin(i+_counter_mode_call) * 127) + 128;
     Adafruit_NeoPixel::setPixelColor(i, (((uint32_t)(r * s)) / 255), (((uint32_t)(g * s)) / 255), (((uint32_t)(b * s)) / 255));
  }

  Adafruit_NeoPixel::show();

  _mode_delay = 35 + ((350 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Blink several LEDs on, reset, repeat.
 * Inspired by www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/
 */
void WS2812FX::mode_twinkle(void) {
  if(_counter_mode_step == 0) {
    strip_off();
    uint16_t min_leds = max(1, _led_count/5); // make sure, at least one LED is on
    uint16_t max_leds = max(1, _led_count/2); // make sure, at least one LED is on
    _counter_mode_step = random(min_leds, max_leds);
  }

  Adafruit_NeoPixel::setPixelColor(random(_led_count), _mode_color);
  Adafruit_NeoPixel::show();

  _counter_mode_step--;
  _mode_delay = 50 + ((1986 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Blink several LEDs in random colors on, reset, repeat.
 * Inspired by www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/
 */
void WS2812FX::mode_twinkle_random(void) {
  _mode_color = color_wheel(random(256));
  mode_twinkle();
}


/*
 * Blink several LEDs on, fading out.
 */
void WS2812FX::mode_twinkle_fade(void) {

  for(uint16_t i=0; i < _led_count; i++) {
    uint32_t px_rgb = Adafruit_NeoPixel::getPixelColor(i);

    byte px_r = (px_rgb & 0x00FF0000) >> 16;
    byte px_g = (px_rgb & 0x0000FF00) >>  8;
    byte px_b = (px_rgb & 0x000000FF) >>  0;

    // fade out (divide by 2)
    px_r = px_r >> 1;
    px_g = px_g >> 1;
    px_b = px_b >> 1;

    Adafruit_NeoPixel::setPixelColor(i, px_r, px_g, px_b);
  }

  if(random(3) == 0) {
    Adafruit_NeoPixel::setPixelColor(random(_led_count), _mode_color);
  }

  Adafruit_NeoPixel::show();

  _mode_delay = 100 + ((100 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Blink several LEDs in random colors on, fading out.
 */
void WS2812FX::mode_twinkle_fade_random(void) {
  _mode_color = color_wheel(random(256));
  mode_twinkle_fade();
}


/*
 * Blinks one LED at a time.
 * Inspired by www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/
 */
void WS2812FX::mode_sparkle(void) {
  Adafruit_NeoPixel::clear();
  Adafruit_NeoPixel::setPixelColor(random(_led_count),_color);
  Adafruit_NeoPixel::show();
  _mode_delay = 10 + ((200 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * Lights all LEDs in the _color. Flashes single white pixels randomly.
 * Inspired by www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/
 */
void WS2812FX::mode_flash_sparkle(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);
  }

  if(random(10) == 7) {
    Adafruit_NeoPixel::setPixelColor(random(_led_count), 255, 255, 255);
    _mode_delay = 20;
  } else {
    _mode_delay = 20 + ((200 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
  }

  Adafruit_NeoPixel::show();
}


/*
 * Like flash sparkle. With more flash.
 * Inspired by www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/
 */
void WS2812FX::mode_hyper_sparkle(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);
  }

  if(random(10) < 4) {
    for(uint16_t i=0; i < max(1, _led_count/3); i++) {
      Adafruit_NeoPixel::setPixelColor(random(_led_count), 255, 255, 255);
    }
    _mode_delay = 20;
  } else {
    _mode_delay = 15 + ((120 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
  }

  Adafruit_NeoPixel::show();
}


/*
 * Classic Strobe effect.
 */
void WS2812FX::mode_strobe(void) {
  if(_counter_mode_call % 2 == 0) {
    for(uint16_t i=0; i < _led_count; i++) {
      Adafruit_NeoPixel::setPixelColor(i, _color);
    }
    _mode_delay = 20;
  } else {
    for(uint16_t i=0; i < _led_count; i++) {
      Adafruit_NeoPixel::setPixelColor(i, 0);
    }
    _mode_delay = 50 + ((1986 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
  }
  Adafruit_NeoPixel::show();
}


/*
 * Strobe effect with different strobe count and pause, controled by _speed.
 */
void WS2812FX::mode_multi_strobe(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, 0);
  }

  if(_counter_mode_step < (2 * ((_speed / 10) + 1))) {
    if(_counter_mode_step % 2 == 0) {
      for(uint16_t i=0; i < _led_count; i++) {
        Adafruit_NeoPixel::setPixelColor(i, _color);
      }
      _mode_delay = 20;
    } else {
      _mode_delay = 50;
    }

  } else {
    _mode_delay = 100 + ((9 - (_speed % 10)) * 125);
  }

  Adafruit_NeoPixel::show();
  _counter_mode_step = (_counter_mode_step + 1) % ((2 * ((_speed / 10) + 1)) + 1);
}


/*
 * Classic Strobe effect. Cycling through the rainbow.
 */
void WS2812FX::mode_strobe_rainbow(void) {
  if(_counter_mode_call % 2 == 0) {
    for(uint16_t i=0; i < _led_count; i++) {
      Adafruit_NeoPixel::setPixelColor(i, color_wheel(_counter_mode_call % 256));
    }
    _mode_delay = 20;
  } else {
    for(uint16_t i=0; i < _led_count; i++) {
      Adafruit_NeoPixel::setPixelColor(i, 0);
    }
    _mode_delay = 50 + ((1986 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
  }
  Adafruit_NeoPixel::show();
}


/*
 * Classic Blink effect. Cycling through the rainbow.
 */
void WS2812FX::mode_blink_rainbow(void) {
  if(_counter_mode_call % 2 == 1) {
    for(uint16_t i=0; i < _led_count; i++) {
      Adafruit_NeoPixel::setPixelColor(i, color_wheel(_counter_mode_call % 256));
    }
    Adafruit_NeoPixel::show();
  } else {
    strip_off();
  }

  _mode_delay = 100 + ((1986 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}


/*
 * _color running on white.
 */
void WS2812FX::mode_chase_white(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, 255, 255, 255);
  }

  uint16_t n = _counter_mode_step;
  uint16_t m = (_counter_mode_step + 1) % _led_count;
  Adafruit_NeoPixel::setPixelColor(n, _color);
  Adafruit_NeoPixel::setPixelColor(m, _color);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * White running on _color.
 */
void WS2812FX::mode_chase_color(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);
  }

  uint16_t n = _counter_mode_step;
  uint16_t m = (_counter_mode_step + 1) % _led_count;
  Adafruit_NeoPixel::setPixelColor(n, 255, 255, 255);
  Adafruit_NeoPixel::setPixelColor(m, 255, 255, 255);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * White running followed by random color.
 */
void WS2812FX::mode_chase_random(void) {
  if(_counter_mode_step == 0) {
    Adafruit_NeoPixel::setPixelColor(_led_count-1, color_wheel(_mode_color));
    _mode_color = get_random_wheel_index(_mode_color);
  }

  for(uint16_t i=0; i < _counter_mode_step; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color_wheel(_mode_color));
  }

  uint16_t n = _counter_mode_step;
  uint16_t m = (_counter_mode_step + 1) % _led_count;
  Adafruit_NeoPixel::setPixelColor(n, 255, 255, 255);
  Adafruit_NeoPixel::setPixelColor(m, 255, 255, 255);

  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * White running on rainbow.
 */
void WS2812FX::mode_chase_rainbow(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color_wheel(((i * 256 / _led_count) + (_counter_mode_call % 256)) % 256));
  }

  uint16_t n = _counter_mode_step;
  uint16_t m = (_counter_mode_step + 1) % _led_count;
  Adafruit_NeoPixel::setPixelColor(n, 255, 255, 255);
  Adafruit_NeoPixel::setPixelColor(m, 255, 255, 255);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * White flashes running on _color.
 */
void WS2812FX::mode_chase_flash(void) {
  const static uint8_t flash_count = 4;
  uint8_t flash_step = _counter_mode_call % ((flash_count * 2) + 1);

  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);
  }

  if(flash_step < (flash_count * 2)) {
    if(flash_step % 2 == 0) {
      uint16_t n = _counter_mode_step;
      uint16_t m = (_counter_mode_step + 1) % _led_count;
      Adafruit_NeoPixel::setPixelColor(n, 255, 255, 255);
      Adafruit_NeoPixel::setPixelColor(m, 255, 255, 255);
      _mode_delay = 20;
    } else {
      _mode_delay = 30;
    }
  } else {
    _counter_mode_step = (_counter_mode_step + 1) % _led_count;
    _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
  }

  Adafruit_NeoPixel::show();
}


/*
 * White flashes running, followed by random color.
 */
void WS2812FX::mode_chase_flash_random(void) {
  const static uint8_t flash_count = 4;
  uint8_t flash_step = _counter_mode_call % ((flash_count * 2) + 1);

  for(uint16_t i=0; i < _counter_mode_step; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color_wheel(_mode_color));
  }

  if(flash_step < (flash_count * 2)) {
    uint16_t n = _counter_mode_step;
    uint16_t m = (_counter_mode_step + 1) % _led_count;
    if(flash_step % 2 == 0) {
      Adafruit_NeoPixel::setPixelColor(n, 255, 255, 255);
      Adafruit_NeoPixel::setPixelColor(m, 255, 255, 255);
      _mode_delay = 20;
    } else {
      Adafruit_NeoPixel::setPixelColor(n, color_wheel(_mode_color));
      Adafruit_NeoPixel::setPixelColor(m, 0, 0, 0);
      _mode_delay = 30;
    }
  } else {
    _counter_mode_step = (_counter_mode_step + 1) % _led_count;
    _mode_delay = 1 + ((10 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);

    if(_counter_mode_step == 0) {
      _mode_color = get_random_wheel_index(_mode_color);
    }
  }

  Adafruit_NeoPixel::show();
}


/*
 * Rainbow running on white.
 */
void WS2812FX::mode_chase_rainbow_white(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, 255, 255, 255);
  }

  uint16_t n = _counter_mode_step;
  uint16_t m = (_counter_mode_step + 1) % _led_count;
  Adafruit_NeoPixel::setPixelColor(n, color_wheel(((n * 256 / _led_count) + (_counter_mode_call % 256)) % 256));
  Adafruit_NeoPixel::setPixelColor(m, color_wheel(((m * 256 / _led_count) + (_counter_mode_call % 256)) % 256));
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Black running on _color.
 */
void WS2812FX::mode_chase_blackout(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, _color);
  }

  uint16_t n = _counter_mode_step;
  uint16_t m = (_counter_mode_step + 1) % _led_count;
  Adafruit_NeoPixel::setPixelColor(n, 0, 0, 0);
  Adafruit_NeoPixel::setPixelColor(m, 0, 0, 0);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Black running on rainbow.
 */
void WS2812FX::mode_chase_blackout_rainbow(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    Adafruit_NeoPixel::setPixelColor(i, color_wheel(((i * 256 / _led_count) + (_counter_mode_call % 256)) % 256));
  }

  uint16_t n = _counter_mode_step;
  uint16_t m = (_counter_mode_step + 1) % _led_count;
  Adafruit_NeoPixel::setPixelColor(n, 0, 0, 0);
  Adafruit_NeoPixel::setPixelColor(m, 0, 0, 0);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Random color intruduced alternating from start and end of strip.
 */
void WS2812FX::mode_color_sweep_random(void) {
  if(_counter_mode_step == 0 || _counter_mode_step == _led_count) {
    _mode_color = get_random_wheel_index(_mode_color);
  }

  if(_counter_mode_step < _led_count) {
    Adafruit_NeoPixel::setPixelColor(_counter_mode_step, color_wheel(_mode_color));
  } else {
    Adafruit_NeoPixel::setPixelColor((_led_count * 2) - _counter_mode_step - 1, color_wheel(_mode_color));
  }
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % (_led_count * 2);
  _mode_delay = 5 + ((50 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Alternating color/white pixels running.
 */
void WS2812FX::mode_running_color(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    if((i + _counter_mode_step) % 4 < 2) {
      Adafruit_NeoPixel::setPixelColor(i, _mode_color);
    } else {
      Adafruit_NeoPixel::setPixelColor(i, 255, 255, 255);
    }
  }
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % 4;
  _mode_delay = 10 + ((30 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Alternating red/blue pixels running.
 */
void WS2812FX::mode_running_red_blue(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    if((i + _counter_mode_step) % 4 < 2) {
      Adafruit_NeoPixel::setPixelColor(i, 255, 0, 0);
    } else {
      Adafruit_NeoPixel::setPixelColor(i, 0, 0, 255);
    }
  }
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % 4;
  _mode_delay = 100 + ((100 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Random colored pixels running.
 */
void WS2812FX::mode_running_random(void) {
  for(uint16_t i=_led_count-1; i > 0; i--) {
    Adafruit_NeoPixel::setPixelColor(i, Adafruit_NeoPixel::getPixelColor(i-1));
  }

  if(_counter_mode_step == 0) {
    _mode_color = get_random_wheel_index(_mode_color);
    Adafruit_NeoPixel::setPixelColor(0, color_wheel(_mode_color));
  }

  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % 2;

  _mode_delay = 50 + ((50 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * K.I.T.T.
 */
void WS2812FX::mode_larson_scanner(void) {

  for(uint16_t i=0; i < _led_count; i++) {
    uint32_t px_rgb = Adafruit_NeoPixel::getPixelColor(i);

    byte px_r = (px_rgb & 0x00FF0000) >> 16;
    byte px_g = (px_rgb & 0x0000FF00) >>  8;
    byte px_b = (px_rgb & 0x000000FF) >>  0;

    // fade out (divide by 2)
    px_r = px_r >> 1;
    px_g = px_g >> 1;
    px_b = px_b >> 1;

    Adafruit_NeoPixel::setPixelColor(i, px_r, px_g, px_b);
  }

  uint16_t pos = 0;

  if(_counter_mode_step < _led_count) {
    pos = _counter_mode_step;
  } else {
    pos = (_led_count * 2) - _counter_mode_step - 2;
  }

  Adafruit_NeoPixel::setPixelColor(pos, _color);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % ((_led_count * 2) - 2);
  _mode_delay = 10 + ((10 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Fireing comets from one end.
 */
void WS2812FX::mode_comet(void) {

  for(uint16_t i=0; i < _led_count; i++) {
    uint32_t px_rgb = Adafruit_NeoPixel::getPixelColor(i);

    byte px_r = (px_rgb & 0x00FF0000) >> 16;
    byte px_g = (px_rgb & 0x0000FF00) >>  8;
    byte px_b = (px_rgb & 0x000000FF) >>  0;

    // fade out (divide by 2)
    px_r = px_r >> 1;
    px_g = px_g >> 1;
    px_b = px_b >> 1;

    Adafruit_NeoPixel::setPixelColor(i, px_r, px_g, px_b);
  }

  Adafruit_NeoPixel::setPixelColor(_counter_mode_step, _color);
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % _led_count;
  _mode_delay = 10 + ((10 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Firework sparks.
 */
void WS2812FX::mode_fireworks(void) {
  uint32_t px_rgb = 0;
  byte px_r = 0;
  byte px_g = 0;
  byte px_b = 0;

  for(uint16_t i=0; i < _led_count; i++) {
    px_rgb = Adafruit_NeoPixel::getPixelColor(i);

    px_r = (px_rgb & 0x00FF0000) >> 16;
    px_g = (px_rgb & 0x0000FF00) >>  8;
    px_b = (px_rgb & 0x000000FF) >>  0;

    // fade out (divide by 2)
    px_r = px_r >> 1;
    px_g = px_g >> 1;
    px_b = px_b >> 1;

    Adafruit_NeoPixel::setPixelColor(i, px_r, px_g, px_b);
  }

  // first LED has only one neighbour
  px_r = (((Adafruit_NeoPixel::getPixelColor(1) & 0x00FF0000) >> 16) >> 1) + ((Adafruit_NeoPixel::getPixelColor(0) & 0x00FF0000) >> 16);
  px_g = (((Adafruit_NeoPixel::getPixelColor(1) & 0x0000FF00) >>  8) >> 1) + ((Adafruit_NeoPixel::getPixelColor(0) & 0x0000FF00) >>  8);
  px_b = (((Adafruit_NeoPixel::getPixelColor(1) & 0x000000FF) >>  0) >> 1) + ((Adafruit_NeoPixel::getPixelColor(0) & 0x000000FF) >>  0);
  Adafruit_NeoPixel::setPixelColor(0, px_r, px_g, px_b);

  // set brightness(i) = ((brightness(i-1)/2 + brightness(i+1)) / 2) + brightness(i)
  for(uint16_t i=1; i < _led_count-1; i++) {
    px_r = ((
            (((Adafruit_NeoPixel::getPixelColor(i-1) & 0x00FF0000) >> 16) >> 1) +
            (((Adafruit_NeoPixel::getPixelColor(i+1) & 0x00FF0000) >> 16) >> 0) ) >> 1) +
            (((Adafruit_NeoPixel::getPixelColor(i  ) & 0x00FF0000) >> 16) >> 0);

    px_g = ((
            (((Adafruit_NeoPixel::getPixelColor(i-1) & 0x0000FF00) >> 8) >> 1) +
            (((Adafruit_NeoPixel::getPixelColor(i+1) & 0x0000FF00) >> 8) >> 0) ) >> 1) +
            (((Adafruit_NeoPixel::getPixelColor(i  ) & 0x0000FF00) >> 8) >> 0);

    px_b = ((
            (((Adafruit_NeoPixel::getPixelColor(i-1) & 0x000000FF) >> 0) >> 1) +
            (((Adafruit_NeoPixel::getPixelColor(i+1) & 0x000000FF) >> 0) >> 0) ) >> 1) +
            (((Adafruit_NeoPixel::getPixelColor(i  ) & 0x000000FF) >> 0) >> 0);

    Adafruit_NeoPixel::setPixelColor(i, px_r, px_g, px_b);
  }

  // last LED has only one neighbour
  px_r = (((Adafruit_NeoPixel::getPixelColor(_led_count-2) & 0x00FF0000) >> 16) >> 2) + ((Adafruit_NeoPixel::getPixelColor(_led_count-1) & 0x00FF0000) >> 16);
  px_g = (((Adafruit_NeoPixel::getPixelColor(_led_count-2) & 0x0000FF00) >>  8) >> 2) + ((Adafruit_NeoPixel::getPixelColor(_led_count-1) & 0x0000FF00) >>  8);
  px_b = (((Adafruit_NeoPixel::getPixelColor(_led_count-2) & 0x000000FF) >>  0) >> 2) + ((Adafruit_NeoPixel::getPixelColor(_led_count-1) & 0x000000FF) >>  0);
  Adafruit_NeoPixel::setPixelColor(_led_count-1, px_r, px_g, px_b);

  if(!_triggered) {
    for(uint16_t i=0; i<max(1,_led_count/20); i++) {
      if(random(10) == 0) {
        Adafruit_NeoPixel::setPixelColor(random(_led_count), _mode_color);
      }
    }
  } else {
    for(uint16_t i=0; i<max(1,_led_count/10); i++) {
      Adafruit_NeoPixel::setPixelColor(random(_led_count), _mode_color);
    }
  }

  Adafruit_NeoPixel::show();

  _mode_delay = 20 + ((20 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}


/*
 * Random colored firework sparks.
 */
void WS2812FX::mode_fireworks_random(void) {
  _mode_color = color_wheel(random(256));
  mode_fireworks();
}


/*
 * Alternating red/green pixels running.
 */
void WS2812FX::mode_merry_christmas(void) {
  for(uint16_t i=0; i < _led_count; i++) {
    if((i + _counter_mode_step) % 4 < 2) {
      Adafruit_NeoPixel::setPixelColor(i, 255, 0, 0);
    } else {
      Adafruit_NeoPixel::setPixelColor(i, 0, 255, 0);
    }
  }
  Adafruit_NeoPixel::show();

  _counter_mode_step = (_counter_mode_step + 1) % 4;
  _mode_delay = 100 + ((100 * (uint32_t)(SPEED_MAX - _speed)) / _led_count);
}

/*
 * Random flickering.
 */
void WS2812FX::mode_fire_flicker(void) {
   mode_fire_flicker_int(3);
}

/*
 * Random flickering, less intesity.
 */
void WS2812FX::mode_fire_flicker_soft(void) {
   mode_fire_flicker_int(6);
}

void WS2812FX::mode_fire_flicker_int(int rev_intensity)
{
    byte p_r = (_color & 0x00FF0000) >> 16;
    byte p_g = (_color & 0x0000FF00) >>  8;
    byte p_b = (_color & 0x000000FF) >>  0;
    byte flicker_val = max(p_r,max(p_g, p_b))/rev_intensity;
    for(uint16_t i=0; i < _led_count; i++)
    {
      int flicker = random(0,flicker_val);
      int r1 = p_r-flicker;
      int g1 = p_g-flicker;
      int b1 = p_b-flicker;
      if(g1<0) g1=0;
      if(r1<0) r1=0;
      if(b1<0) b1=0;
      Adafruit_NeoPixel::setPixelColor(i,r1,g1, b1);
    }
    Adafruit_NeoPixel::show();
    _mode_delay = 10 + ((500 * (uint32_t)(SPEED_MAX - _speed)) / SPEED_MAX);
}