symmetry.ino

// draw 2x2 box on 4 x 90 grid
void drawBox(int row, int col, int color) {
  row = row % 4;
  col = col % (ledsPerStrip/2);
  for (int offset = -1; offset <= 0; offset++) {
    for (int x = 0; x <= 1; x++) {
      int actualRow = row * 2 + offset;
      if (actualRow >= 0 && actualRow < 6) {
        pixel(actualRow, col*2 + x, color);          
      }  
    }
  }  
}

// draw a vertical line or column
void drawColumn(int col, int width, int color) {
  col = col % ledsPerStrip;
  for (int columnCount = 0; columnCount < width; columnCount++) {
    for (int row = 0; row < nStrips; row++) {
      pixel(row, col + columnCount, color);
    }
  }
}

void randomBlocks() {
  colorWipe(BLACK);
  int colors[] = {RED, GREEN, BLUE, WHITE};
  for(int step = 0; step < 100000; step++) {
    drawBox(random(4), random(ledsPerStrip/2), colors[random(4)]);
    leds.show();
    delayMicroseconds(2000);
    colorFade(BLACK, 0.95);
  }
}

void alternatingCheckerboard() {
  for(int step = 0; step < 1000000; step++) {
    colorWipe(BLACK);
    for(int i = 0; i < ledsPerStrip/12; i++) {
      drawBox(bounce(step, 4), step + i * 6, (step % 3 == 0) ? WHITE : 0x888888);
    }
    leds.show();
    delayMicroseconds(500000);
  }
}

void test() {
  const int period = 18;
  for(int step = 0; step < 100000; step++) {
    colorWipe(BLACK);
    if ((step / 50) % 2 == 0) {
      periodic(period, bounce(step, 6), step % period, BLUE); 
    } else {
      reflected(period, 0, bounce(step, 6), bounce(step, period), RED);         
    }    
    leds.show();
    delayMicroseconds(100000);
  }
}