/* 
 Adapted from sutaburosu's AA_lines.ino code. Many thanks!
*/

#include <FastLED.h>

#define WIDTH 64
#define HEIGHT 13
#define CANVAS_HEIGHT 64
#define RASTER_SPACING 5
#define NUM_LEDS (WIDTH * HEIGHT)

// CRGB bigCanvas[CANVAS_NUMLEDS + 1];
CRGB leds[NUM_LEDS + 1];

CRGBPalette16 rainbowPalette = {
  0xFF0000, 0x7F0000, 0xAB5500, 0x552A00, 0xABAB00, 0x555500, 0x00FF00, 0x007F00,
  0x00AB55, 0x00552A, 0x0000FF, 0x00007F, 0x5500AB, 0x2A0055, 0xAB0055, 0x55002A
};

CRGBPalette16 greenStripe = {
  0x00FF00, 0x00FF00, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
  0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000
};

CRGBPalette16 yellowStripe = {
  0xFFFF00, 0xFFFF00, 0xFFFF00, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
  0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000
};

CRGBPalette16 fadeFactorPalette = {
  0xFF0000, 0xFF0000, 0xFF0000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
  0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000
};


CRGBPalette16 redStripe = {
  0xFF0000, 0xFF0000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000,
  0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000, 0x000000
};

boolean _twist = false;

void setup() 
{
  FastLED.addLeds<NEOPIXEL, 3>(leds, NUM_LEDS);
  Serial.begin(115200);
  Serial.print(sizeof(CRGB));
}

void loop()
{
    sup(1,148,5,HeatColors_p, LINEARBLEND);
    FastLED.show();
}

uint16_t XY(uint8_t x, uint8_t y) {
  if (x >= WIDTH) return NUM_LEDS;
  if (y >= HEIGHT) return NUM_LEDS;
  return y * WIDTH + x;
}

// With thanks to Steve Dommett; github.com/sutaburosu
void sup(uint8_t rotationSpeed, uint8_t translationSpeed, uint8_t lineWidth, CRGBPalette16 palette, TBlendType blendType) {
  uint32_t yHueDelta ;
  uint32_t xHueDelta ;
  float rotationSpeedFloat = fmap((float)rotationSpeed,(float)0,(float)255,-6.0,6.0); // Between -6 and 6
  int16_t mappedTranslationSpeed = map(translationSpeed,0,255,-2<<12,2<<12); // Between -2^13 - 2^13 (higher is too fast)

  uint32_t ms = millis();

  yHueDelta = (int32_t)sin16((int16_t)round(ms * 1.5 * rotationSpeedFloat)) * lineWidth;
  xHueDelta = (int32_t)cos16((int16_t)round(ms * rotationSpeedFloat)) * lineWidth;
  
  int32_t startHue = ms * mappedTranslationSpeed;
  int32_t lineStartHue = startHue - (CANVAS_HEIGHT + 2) / 2 * yHueDelta;

  for (byte y = 0; y < CANVAS_HEIGHT; y++) {
    uint32_t pixelHue = lineStartHue - (WIDTH + 2) / 2 * xHueDelta;
    uint32_t xhd = xHueDelta;
    lineStartHue += yHueDelta;
    for (byte x = 0; x < WIDTH; x++) {
      if( y % RASTER_SPACING == 0 ) {
        leds[XY(x, y/RASTER_SPACING)] = ColorFromPaletteExtended(palette, pixelHue >> 7, 255, blendType);
      }
      pixelHue += xHueDelta;
    }
  }
}


// from: https://github.com/FastLED/FastLED/pull/202
CRGB ColorFromPaletteExtended(const CRGBPalette16& pal, uint16_t index, uint8_t brightness, TBlendType blendType) {
  // Extract the four most significant bits of the index as a palette index.
  uint8_t index_4bit = (index >> 12);
  // Calculate the 8-bit offset from the palette index.
  uint8_t offset = (uint8_t)(index >> 4);
  // Get the palette entry from the 4-bit index
  const CRGB* entry = &(pal[0]) + index_4bit;
  uint8_t red1   = entry->red;
  uint8_t green1 = entry->green;
  uint8_t blue1  = entry->blue;

  uint8_t blend = offset && (blendType != NOBLEND);
  if (blend) {
    if (index_4bit == 15) {
      entry = &(pal[0]);
    } else {
      entry++;
    }

    // Calculate the scaling factor and scaled values for the lower palette value.
    uint8_t f1 = 255 - offset;
    red1   = scale8_LEAVING_R1_DIRTY(red1,   f1);
    green1 = scale8_LEAVING_R1_DIRTY(green1, f1);
    blue1  = scale8_LEAVING_R1_DIRTY(blue1,  f1);

    // Calculate the scaled values for the neighbouring palette value.
    uint8_t red2   = entry->red;
    uint8_t green2 = entry->green;
    uint8_t blue2  = entry->blue;
    red2   = scale8_LEAVING_R1_DIRTY(red2,   offset);
    green2 = scale8_LEAVING_R1_DIRTY(green2, offset);
    blue2  = scale8_LEAVING_R1_DIRTY(blue2,  offset);
    cleanup_R1();

    // These sums can't overflow, so no qadd8 needed.
    red1   += red2;
    green1 += green2;
    blue1  += blue2;
  }
  if (brightness != 255) {
    // nscale8x3_video(red1, green1, blue1, brightness);
    nscale8x3(red1, green1, blue1, brightness);
  }
  return CRGB(red1, green1, blue1);
}

float fmap(float x, float a, float b, float c, float d)
{
      float f=x/(b-a)*(d-c)+c;
      return f;
}