framework-arduinoteensy-cxx20/libraries/FastLED/examples/NoisePlayground/NoisePlayground.ino

#include <FastLED.h>

#define kMatrixWidth  16
#define kMatrixHeight 16

#define NUM_LEDS (kMatrixWidth * kMatrixHeight)
// Param for different pixel layouts
#define kMatrixSerpentineLayout  true

// led array
CRGB leds[kMatrixWidth * kMatrixHeight];

// x,y, & time values
uint32_t x,y,v_time,hue_time,hxy;

// Play with the values of the variables below and see what kinds of effects they
// have!  More octaves will make things slower.

// how many octaves to use for the brightness and hue functions
uint8_t octaves=1;
uint8_t hue_octaves=3;

// the 'distance' between points on the x and y axis
int xscale=57771;
int yscale=57771;

// the 'distance' between x/y points for the hue noise
int hue_scale=1;

// how fast we move through time & hue noise
int time_speed=1111;
int hue_speed=31;

// adjust these values to move along the x or y axis between frames
int x_speed=331;
int y_speed=1111;

void loop() {
  // fill the led array 2/16-bit noise values
  fill_2dnoise16(LEDS.leds(), kMatrixWidth, kMatrixHeight, kMatrixSerpentineLayout,
                octaves,x,xscale,y,yscale,v_time,
                hue_octaves,hxy,hue_scale,hxy,hue_scale,hue_time, false);

  LEDS.show();

  // adjust the intra-frame time values
  x += x_speed;
  y += y_speed;
  v_time += time_speed;
  hue_time += hue_speed;
  // delay(50);
}


void setup() {
  // initialize the x/y and time values
  random16_set_seed(8934);
  random16_add_entropy(analogRead(3));

  Serial.begin(57600);
  Serial.println("resetting!");

  delay(3000);
  LEDS.addLeds<WS2811,6,GRB>(leds,NUM_LEDS);
  LEDS.setBrightness(96);

  hxy = (uint32_t)((uint32_t)random16() << 16) + (uint32_t)random16();
  x = (uint32_t)((uint32_t)random16() << 16) + (uint32_t)random16();
  y = (uint32_t)((uint32_t)random16() << 16) + (uint32_t)random16();
  v_time = (uint32_t)((uint32_t)random16() << 16) + (uint32_t)random16();
  hue_time = (uint32_t)((uint32_t)random16() << 16) + (uint32_t)random16();

}