// SPDX-FileCopyrightText: 2017 Mikey Sklar for Adafruit Industries
//
// SPDX-License-Identifier: MIT

#ifdef __AVR__
  #include <avr/power.h>
#endif

#include <Adafruit_NeoPixel.h>

#define PIXEL_PIN    1  // Pin connected to neo pixels
#define PIXEL_COUNT  7  // Count of neo pixels

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

void setup() {

  strip.begin();
  strip.show();

}

// Linear interpolation of y value given min/max x, min/max y, and x position.
float lerp(float x, float x0, float x1, float y0, float y1)
{
  // Clamp x within x0 and x1 bounds.
  x = x > x1 ? x1 : x;
  x = x < x0 ? x0 : x;
  // Calculate linear interpolation of y value.
  return y0 + (y1-y0)*((x-x0)/(x1-x0));
}

// Set all pixels to the specified color.
void fill_pixels(Adafruit_NeoPixel& pixels, uint32_t color)
{
  for (int i=0; i < pixels.numPixels(); ++i) {
    pixels.setPixelColor(i, color);
  }
  strip.show();
}

// Get the color of a pixel within a smooth gradient of two colors.
uint32_t color_gradient(uint8_t start_r, // Starting R,G,B color
                        uint8_t start_g,
                        uint8_t start_b, 
                        uint8_t end_r,   // Ending R,G,B color
                        uint8_t end_g,
                        uint8_t end_b,
                        float pos)       // Position along gradient, should be a value 0 to 1.0
{
  // Interpolate R,G,B values and return them as a color.  
  uint8_t red   = (uint8_t) lerp(pos, 0.0, 1.0, start_r, end_r);
  uint8_t green = (uint8_t) lerp(pos, 0.0, 1.0, start_g, end_g);
  uint8_t blue  = (uint8_t) lerp(pos, 0.0, 1.0, start_b, end_b);
  return Adafruit_NeoPixel::Color(red, green, blue);
}

void animate_gradient_fill(Adafruit_NeoPixel& pixels, // NeoPixel strip/loop/etc.
                           uint8_t start_r,           // Starting R,G,B color
                           uint8_t start_g,
                           uint8_t start_b, 
                           uint8_t end_r,             // Ending R,G,B color
                           uint8_t end_g,
                           uint8_t end_b,
                           int duration_ms)           // Total duration of animation, in milliseconds
{
  unsigned long start = millis();
  // Display start color.
  fill_pixels(pixels, Adafruit_NeoPixel::Color(start_r, start_g, start_b));
  // Main animation loop.
  unsigned long delta = millis() - start;
  while (delta < duration_ms) {
    // Calculate how far along we are in the duration as a position 0...1.0
    float pos = (float)delta / (float)duration_ms;
    // Get the gradient color and fill all the pixels with it.
    uint32_t color = color_gradient(start_r, start_g, start_b, end_r, end_g, end_b, pos);
    fill_pixels(pixels, color);
    // Update delta and repeat.
    delta = millis() - start;
  }
  // Display end color.
  fill_pixels(pixels, Adafruit_NeoPixel::Color(end_r, end_g, end_b));
}
void loop() { 
  
  // Run It:    

  // Nice fade from dim red to full red for 1/2 of a second:
  animate_gradient_fill(strip,         
                      10, 0, 0,
                      255, 0, 0,
                      500);
  // Then fade from full red to dim red for 1/2 a second.
  animate_gradient_fill(strip,         
                      255, 0, 0,
                      10, 0, 0,
                      500);
  //delay(1000); Use this delay if using multiple color fades
  }

// SPDX-FileCopyrightText: 2017 Mikey Sklar for Adafruit Industries
//
// SPDX-License-Identifier: MIT

#ifdef __AVR__
  #include <avr/power.h>
#endif

#include <Adafruit_NeoPixel.h>

#define PIXEL_PIN    1  // Pin connected to neo pixels
#define PIXEL_COUNT  7  // Count of neo pixels

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

void setup() {

  strip.begin();
  strip.show();

}

// Linear interpolation of y value given min/max x, min/max y, and x position.
float lerp(float x, float x0, float x1, float y0, float y1)
{
  // Clamp x within x0 and x1 bounds.
  x = x > x1 ? x1 : x;
  x = x < x0 ? x0 : x;
  // Calculate linear interpolation of y value.
  return y0 + (y1-y0)*((x-x0)/(x1-x0));
}

// Set all pixels to the specified color.
void fill_pixels(Adafruit_NeoPixel& pixels, uint32_t color)
{
  for (int i=0; i < pixels.numPixels(); ++i) {
    pixels.setPixelColor(i, color);
  }
  strip.show();
}

// Get the color of a pixel within a smooth gradient of two colors.
uint32_t color_gradient(uint8_t start_r, // Starting R,G,B color
                        uint8_t start_g,
                        uint8_t start_b, 
                        uint8_t end_r,   // Ending R,G,B color
                        uint8_t end_g,
                        uint8_t end_b,
                        float pos)       // Position along gradient, should be a value 0 to 1.0
{
  // Interpolate R,G,B values and return them as a color.  
  uint8_t red   = (uint8_t) lerp(pos, 0.0, 1.0, start_r, end_r);
  uint8_t green = (uint8_t) lerp(pos, 0.0, 1.0, start_g, end_g);
  uint8_t blue  = (uint8_t) lerp(pos, 0.0, 1.0, start_b, end_b);
  return Adafruit_NeoPixel::Color(red, green, blue);
}

void animate_gradient_fill(Adafruit_NeoPixel& pixels, // NeoPixel strip/loop/etc.
                           uint8_t start_r,           // Starting R,G,B color
                           uint8_t start_g,
                           uint8_t start_b, 
                           uint8_t end_r,             // Ending R,G,B color
                           uint8_t end_g,
                           uint8_t end_b,
                           int duration_ms)           // Total duration of animation, in milliseconds
{
  unsigned long start = millis();
  // Display start color.
  fill_pixels(pixels, Adafruit_NeoPixel::Color(start_r, start_g, start_b));
  // Main animation loop.
  unsigned long delta = millis() - start;
  while (delta < duration_ms) {
    // Calculate how far along we are in the duration as a position 0...1.0
    float pos = (float)delta / (float)duration_ms;
    // Get the gradient color and fill all the pixels with it.
    uint32_t color = color_gradient(start_r, start_g, start_b, end_r, end_g, end_b, pos);
    fill_pixels(pixels, color);
    // Update delta and repeat.
    delta = millis() - start;
  }
  // Display end color.
  fill_pixels(pixels, Adafruit_NeoPixel::Color(end_r, end_g, end_b));
}
void loop() { 
  
  // Run It:    

  // Nice fade from dim red to full red for 1/2 of a second:
  animate_gradient_fill(strip,         
                      10, 0, 0,
                      255, 0, 0,
                      500);
  // Then fade from full red to dim red for 1/2 a second.
  animate_gradient_fill(strip,         
                      255, 0, 0,
                      10, 0, 0,
                      500);
  //delay(1000); Use this delay if using multiple color fades
  }

# SPDX-FileCopyrightText: 2017 Mikey Sklar for Adafruit Industries
#
# SPDX-License-Identifier: MIT

import time

import board
import neopixel

pixpin = board.D1
numpix = 7
wait = .5  # 1/2 second color fade duration

# defaults to RGB|GRB Neopixels
strip = neopixel.NeoPixel(pixpin, numpix, brightness=1, auto_write=False)


# uncomment the following 3 line for RGBW Neopixels
# strip = neopixel.NeoPixel(
# pixpin, numpix, bpp=4, brightness=.3, auto_write=True
# )

# Linear interpolation of y value given min/max x, min/max y, and x position.


def lerp(x, x0, x1, y0, y1):
    # Clamp x within x0 and x1 bounds.
    if x > x1:
        x = x1

    if x < x0:
        x = x0

    # Calculate linear interpolation of y value.
    return y0 + (y1 - y0) * ((x - x0) / (x1 - x0))


# Set all pixels to the specified color.


def fill_pixels(r, g, b):
    for i in range(0, numpix):
        strip[i] = (r, g, b)
        strip.write()


# Get the color of a pixel within a smooth gradient of two colors.
# Starting R,G,B color
# Ending R,G,B color
# Position along gradient, should be a value 0 to 1.0


def color_gradient(start_r, start_g, start_b, end_r, end_g, end_b, pos):
    # Interpolate R,G,B values and return them as a color.
    red = lerp(pos, 0.0, 1.0, start_r, end_r)
    green = lerp(pos, 0.0, 1.0, start_g, end_g)
    blue = lerp(pos, 0.0, 1.0, start_b, end_b)

    return (red, green, blue)


# Starting R,G,B color
# Ending R,G,B color
# Total duration of animation, in milliseconds


def animate_gradient_fill(start_r, start_g, start_b, end_r, end_g, end_b,
                          duration_ms):
    start = time.monotonic()

    # Display start color.
    fill_pixels(start_r, start_g, start_b)

    # Main animation loop.
    delta = time.monotonic() - start

    while delta < duration_ms:
        # Calculate how far along we are in the duration as a position 0...1.0
        pos = delta / duration_ms
        # Get the gradient color and fill all the pixels with it.
        color = color_gradient(start_r, start_g, start_b,
                               end_r, end_g, end_b, pos)
        fill_pixels(int(color[0]), int(color[1]), int(color[2]))
        # Update delta and repeat.
        delta = time.monotonic() - start

    # Display end color.
    fill_pixels(end_r, end_g, end_b)


while True:
    # Run It:

    # Nice fade from dim red to full red for 1/2 of a second:
    animate_gradient_fill(10, 0, 0, 255, 0, 0, wait)

    # Then fade from full red to dim red for 1/2 a second.
    animate_gradient_fill(255, 0, 0, 10, 0, 0, wait)

    # time.sleep(1) # Use this delay if using multiple color fades

# SPDX-FileCopyrightText: 2017 Mikey Sklar for Adafruit Industries
#
# SPDX-License-Identifier: MIT

import time

import board
import neopixel

pixpin = board.D1
numpix = 7
wait = .5  # 1/2 second color fade duration

# defaults to RGB|GRB Neopixels
strip = neopixel.NeoPixel(pixpin, numpix, brightness=1, auto_write=False)


# uncomment the following 3 line for RGBW Neopixels
# strip = neopixel.NeoPixel(
# pixpin, numpix, bpp=4, brightness=.3, auto_write=True
# )

# Linear interpolation of y value given min/max x, min/max y, and x position.


def lerp(x, x0, x1, y0, y1):
    # Clamp x within x0 and x1 bounds.
    if x > x1:
        x = x1

    if x < x0:
        x = x0

    # Calculate linear interpolation of y value.
    return y0 + (y1 - y0) * ((x - x0) / (x1 - x0))


# Set all pixels to the specified color.


def fill_pixels(r, g, b):
    for i in range(0, numpix):
        strip[i] = (r, g, b)
        strip.write()


# Get the color of a pixel within a smooth gradient of two colors.
# Starting R,G,B color
# Ending R,G,B color
# Position along gradient, should be a value 0 to 1.0


def color_gradient(start_r, start_g, start_b, end_r, end_g, end_b, pos):
    # Interpolate R,G,B values and return them as a color.
    red = lerp(pos, 0.0, 1.0, start_r, end_r)
    green = lerp(pos, 0.0, 1.0, start_g, end_g)
    blue = lerp(pos, 0.0, 1.0, start_b, end_b)

    return (red, green, blue)


# Starting R,G,B color
# Ending R,G,B color
# Total duration of animation, in milliseconds


def animate_gradient_fill(start_r, start_g, start_b, end_r, end_g, end_b,
                          duration_ms):
    start = time.monotonic()

    # Display start color.
    fill_pixels(start_r, start_g, start_b)

    # Main animation loop.
    delta = time.monotonic() - start

    while delta < duration_ms:
        # Calculate how far along we are in the duration as a position 0...1.0
        pos = delta / duration_ms
        # Get the gradient color and fill all the pixels with it.
        color = color_gradient(start_r, start_g, start_b,
                               end_r, end_g, end_b, pos)
        fill_pixels(int(color[0]), int(color[1]), int(color[2]))
        # Update delta and repeat.
        delta = time.monotonic() - start

    # Display end color.
    fill_pixels(end_r, end_g, end_b)


while True:
    # Run It:

    # Nice fade from dim red to full red for 1/2 of a second:
    animate_gradient_fill(10, 0, 0, 255, 0, 0, wait)

    # Then fade from full red to dim red for 1/2 a second.
    animate_gradient_fill(255, 0, 0, 10, 0, 0, wait)

    # time.sleep(1) # Use this delay if using multiple color fades