Spiral Matrix

# spiral matrix
# Joe, 13/12/2014

import appuifw as A
import graphics as G

class Spiral:
 def gen(self,num):
  if num<=0:
   return []
  matrix=[row[:] for row in [[0]*num]*num]
  row1=0
  row2=num-1
  col1=0
  col2=num-1
  cur=1
  while 1:
   if cur>num*num:
    break
   for c in range(col1,col2+1):
    matrix[row1][c]=cur
    cur+=1
   row1+=1
   for r in range(row1,row2+1):
    matrix[r][col2]=cur
    cur+=1
   col2-=1
   for c in range(col2,col1-1,-1):
    matrix[row2][c]=cur
    cur+=1
   row2-=1
   for r in range(row2,row1-1,-1):
    matrix[r][col1]=cur
    cur+=1
   col1+=1
  return matrix


class Board:
 def __init__(self,matrix):
  self.w,self.h=G.sysinfo.display_pixels()
  self.img=G.Image.new((self.w,self.h))
  self.run=False
  self.mat=matrix
  A.app.screen='full'
  self.c=A.Canvas(redraw_callback=self._redraw)
  A.app.body=self.c
  A.app.exit_key_handler=self.exit

 def exit(self):
  self.run=0 #A.app.set_exit()

 def _redraw(self,rect):
  if self.img:
   self.c.blit(self.img)

 def _tsize(self,text):
  if not isinstance(text,unicode):
   text=unicode(text)
  m=self.img.measure_text(text,font=u'latinplain12')[0]
  w,h=(m[2]-m[0],m[3]-m[1])
  return (w,h)

 def draw(self):
  self.run=True
  px,py=5,5
  pad=1
  width=20
  tx,tdx,title=5,3,u'Spiral Matrix'
  while self.run:
   self.img.clear(0)
   for i in range(len(self.mat)):
    for j in range(len(self.mat[i])):
     dx=px+(j*width)+(j*pad)
     dy=py+(i*width)+(i*pad)
     self.img.rectangle((dx,dy,dx+width,dy+width),fill=(0,255-(self.mat[i][j]*4),0))
     self.img.text((dx+4,dy+15),u'%d' %self.mat[i][j],0xffffff,'legend')

   if (tx+tdx > (self.w-self._tsize(title)[0])) or (tx+tdx < 0):tdx=-tdx
   tx=tx+tdx
   self.img.text((tx,self.h-10),title,0xffffff)
   self._redraw(0)
   A.e32.ao_sleep(1e-04)


sp=Spiral()
matrix=sp.gen(8) # menghasilkan matrix 8x8 (baca: dari sudut kiri atas kekanan berbentuk spiral berakhir di tengah)

board=Board(matrix)
board.draw()