File content as of revision 0:b06afbefd350:

#include "mbed.h"
#include "c128x64spi.h"

c128x64spi fstn(PTD2, PTD3, PTD1, PTD0, PTD5, PTA13); // mosi, miso, sclk, cs, rs, reset
Serial pc(USBTX, USBRX);
#define COLOR 1
#define BG_COLOR 0

void Dragon(int x1,int y1,int x2,int y2,int lv)
{
  // pc.printf("Enter Dragon(%d,%d,%d,%d,%d)\r\n", x1, y1, x2, y2, lv);
  int h,x3,y3;
  if (x1 == x2) {
    h = abs(y1 - y2) / 2;
    if (h * lv == 0) {
      fstn.line(x1, y1, x2, y2, COLOR); //ここで(x1,y1)から(x2,y2)まで線を描く
    } else {
      if (y1 < y2) {
        x3 = x1 + h;
        y3 = y1 + h;
      } else {
        x3 = x1 - h;
        y3 = y1 - h;
      }
      Dragon(x1, y1, x3, y3, lv - 1);
      Dragon(x2, y2, x3, y3, lv - 1);
    }
  } else if (y1 == y2) {
    h = abs(x1 - x2) / 2;
    if (h * lv == 0) {
      fstn.line(x1, y1, x2, y2, COLOR);//ここで(x1,y1)から(x2,y2)まで線を描く
    } else {
      if (x1 < x2) {
        x3 = x1 + h;
        y3 = y1 - h;
      } else {
        x3 = x1 - h;
        y3 = y1 + h;
      }
      Dragon(x1,y1,x3,y3,lv - 1);
      Dragon(x2,y2,x3,y3,lv - 1);
    }
  } else {
    if (lv == 0) {
      fstn.line(x1, y1, x2, y2, COLOR);//ここで(x1,y1)から(x2,y2)まで線を描く
    } else if (x1 < x2) {
      if (y1 < y2) {
        Dragon(x1,y1,x2,y1,lv - 1);
        Dragon(x2,y2,x2,y1,lv - 1);
      } else {
        Dragon(x1,y1,x1,y2,lv - 1);
        Dragon(x2,y2,x1,y2,lv - 1);
      }
    } else {
      if (y1 < y2) {
        Dragon(x1,y1,x1,y2,lv - 1);
        Dragon(x2,y2,x1,y2,lv - 1);
      } else {
        Dragon(x1,y1,x2,y1,lv - 1);
        Dragon(x2,y2,x2,y1,lv - 1);
      }
    }
  }
  // pc.printf("Leave Dragon(%d,%d,%d,%d,%d)\r\n", x1, y1, x2, y2, lv);
}

int main() {
  int i, x, y;

  pc.baud(9600);
  pc.printf("start\r\n");
#if 0
  for (y = 0; y < 64; y++)
    for (x = 0; x < 128; x++)
      fstn.pixel(x, y, 1);
  wait(1);    
  for (y = 0; y < 64; y++)
    for (x = 0; x < 128; x++)
      fstn.pixel(x, y, 0);
  wait(1);
  
  fstn.clr(0);
  for (x = 0; x < 64; x++)
    fstn.pixel(x, x, 1);
  wait(1);
  
  fstn.clr(0);
  fstn.hline(0, 127, 32, 1);
  wait(1);
  
  fstn.clr(0);
  fstn.vline(63, 0, 63, 1);
  wait(1);
  
  fstn.clr(0);
  fstn.line(0, 0, 127, 63, 1);
  fstn.line(127, 0, 0, 63, 1);
  wait(1);
#endif  
  // Dragon
  while (1) {
    for (i = 0; i < 12; i++) {
      pc.printf("dragon %d\r\n", i);
      fstn.clr(BG_COLOR);
      Dragon(32, 42, 96, 42, i);
      wait(0.5);
    }
    wait(20);
  }
}