gnkarn

#include "FastLED.h"

// matrix size
uint8_t Width  = 16;
uint8_t Height = 16;
uint8_t CentreX =  (Width / 2) - 1;
uint8_t CentreY = (Height / 2) - 1;

// NUM_LEDS = Width * Height
#define NUM_LEDS      256

gnkarn

// Matrix effect by Jeremy Williams
// Designed for Game Frame
// http://www.ledseq.com

#include <FastLED.h>

// LED setup
#define kMatrixWidth  16
#define kMatrixHeight 16
#define DATA_PIN 2

gnkarn

float speed = 0.3; // speed of the movement along the Lissajous curves
float size = 3;    // amplitude of the curves

for (uint8_t y = 0; y < Height; y++) {
    for (uint8_t x = 0; x < Width; x++) {

      float cx = y + float(size * (sinf (float(speed * 0.003 * float(millis() ))) ) ) - 8;  // the 8 centers the middle on a 16x16
      float cy = x + float(size * (cosf (float(speed * 0.0022 * float(millis()))) ) ) - 8;
      float v = 127 * (1 + sinf ( sqrtf ( ((cx * cx) + (cy * cy)) ) ));
      uint8_t data = v;

gnkarn

CRGB ColorFromPalette12(CRGBPalette16 pal, uint16_t index, uint8_t brightness, TBlendType blendType) {
  //index is a 12-bit number, range 0-4095
  
  //uint8_t hi4 = lsrX4(index);
  //uint8_t lo4 = index & 0x0F;
  uint8_t hi4 = (index & 0x0F00) >> 8; //***shift 8 bits to the right instead of 4
  uint8_t lo8 = index & 0xFF; //***keep right 8 bytes instead of right 4 bytes
  
  // const CRGB* entry = &(pal[0]) + hi4;
  // since hi4 is always 0..15, hi4 * sizeof(CRGB) can be a single-byte value,

gnkarn

/*
A FastLED matrix example:
A simplex noise field fully modulated and controlled by itself
written by
Stefan Petrick 2017
Do with it whatever you like and show your results to the FastLED community
https://plus.google.com/communities/109127054924227823508
*/

#include "FastLED.h"

gnkarn

void noise_noise1() {

  CRGBPalette16 Pal( pit );

/* here is how the palette looks like:
DEFINE_GRADIENT_PALETTE( pit ) {
  0,     3,   3,   3,
  64,   13,   13, 255,  // blue
  128,   3,   3,   3,
  192, 255, 130,   3,   // orange