Fastled "corner pulse sin8"

//----------------------------------------------
//2015 sprocket2cog CC.
// 8x8 matrix (non serpentine) "corner pulse sketch"
//----------------------------------------------
#include "FastLED.h"
#define DATA_PIN    6
#define CHIPSET     WS2812B
#define COLOR_ORDER GRB
#define NUM_LEDS    64
#define BRIGHTNESS  255
CRGB leds[NUM_LEDS];
int x=0;
void setup() {
   FastLED.addLeds<CHIPSET, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
   LEDS.setBrightness(BRIGHTNESS);
}
void loop() {
   drawPixels();
   FastLED.show();
   x=x+1;
   for (int i = 0 ; i < NUM_LEDS; i++) {
    leds[i] = CRGB::Black;
};
  FastLED.show();
  }
void drawPixels(){
   leds[sin8(x)/32] = CHSV(cos8(x),200,200);
   leds[(sin8(7-x)/32)*8] = CHSV(cos8(x),200,200);
   leds[sin8(7-x)/32] = CHSV(sin8(x),200,200);
   leds[(sin8(x)/32)*8] = CHSV(cos8(x),200,200);
   leds[(sin8(x)/32)*8+7] = CHSV(sin8(x),200,200);
   leds[(sin8(x)/32)+56] = CHSV(cos8(x),200,200);
   leds[(sin8(7-x)/32)*8+7] = CHSV(sin8(x),200,200);
   leds[sin8(7-x)/32+56] = CHSV(sin8(x),200,200);
}