sindots

/*
   By: ldirko (on Reddit)

  https://editor.soulmatelights.com/gallery/597-sin-dots

  Minimum width/height of 4.

*/

#include <FastLED.h>

#define LED_PIN  12

const uint8_t matrixWidth  = 16;
const uint8_t matrixHeight = 16;

#define NUM_LEDS (matrixWidth*matrixHeight)
#define matrixSerpentineLayout true

CRGB leds[NUM_LEDS];


void setup() {
  delay(1000);
  Serial.begin(115200);
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(64);
} // setup()



void loop () {

  EVERY_N_MILLIS(23) {
    sindots();
  }
  FastLED.show();

} // loop()


void sindots() {
  fadeToBlackBy(leds, NUM_LEDS, 15);
  byte t1 = millis() / 20;
  byte t2 = sin8(t1) / 4 * 2;
  for (uint16_t i = 0; i < 13; i++) {
    byte x = sin8(t1 + i * 20) * matrixWidth / 256;
    byte y = sin8(t2 + i * 20) * matrixHeight / 256;

    static int maxVal = 0;
    if (XY(x, y) > maxVal) {maxVal = XY(x,y); Serial.println(maxVal); }

    leds[XY(x, y)] = CHSV(i * 255 / 13, 255, 255);
  }
  blur2d(leds, matrixWidth, matrixHeight, 16);
}



uint16_t XY( uint8_t x, uint8_t y) {

  uint16_t i;

  if ( matrixSerpentineLayout == false) {
    i = (y * matrixWidth) + x;
  }

  if ( matrixSerpentineLayout == true) {
    if ( y & 0x01) {
      uint8_t reverseX = (matrixWidth - 1) - x;
      i = (y * matrixWidth) + reverseX;
    } else {
      i = (y * matrixWidth) + x;
    }
  }
  return i;

} // XY()