StefanPetrick

/*
Metaballs proof of concept by Stefan Petrick
...very rough 8bit math here...

read more about the concept of isosurfaces and metaballs:
https://www.gamedev.net/articles/programming/graphics/exploring-metaballs-and-isosurfaces-in-2d-r2556

*/

#include "FastLED.h"

StefanPetrick

#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

StefanPetrick

/*

  FastLED Fire 2018 by Stefan Petrick

  The visual effect highly depends on the framerate.
  In the Youtube video it runs at arround 70 fps.
  https://www.youtube.com/watch?v=SWMu-a9pbyk

  The heatmap movement is independend from the framerate.
  The actual scaling operation is not.

StefanPetrick

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;

StefanPetrick

/*
  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"

StefanPetrick

/*
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"

StefanPetrick

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

StefanPetrick

// as showed on youtube
void noise_audio2() {
  read_audio();
  CRGBPalette16 Pal( pit3 ); // the red one
  y[0] += (bands[4] - 10) * 4;
  scale_x[0] = 10000 - (bands[0] * 40);
  scale_y[0] = scale_x[0];
  byte layer = 0;
  for (uint8_t i = 0; i < Width; i++) {
    uint32_t ioffset = scale_x[layer] * (i - CentreX);

StefanPetrick

/*
 * A FastLED example showing how to
 * map a virtual 2d matrix onto a circular led setup
 *
 * limitations: works so far only up to 255 leds
 *
 * written by Stefan Petrick 2016
 */

#include "FastLED.h"

StefanPetrick

#include "FastLED.h"

#define NUM_LEDS 144

// have 3 independent CRGBs - 2 for the sources and one for the output
CRGB leds[NUM_LEDS];
CRGB leds2[NUM_LEDS];
CRGB leds3[NUM_LEDS];

void setup() {