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# rc.py
class RC():
def __init__(self,nr,nc):
self.nr=nr; self.nc=nc
def inc_r(self,ind):
r,c=self.row_col(ind)
r+=1
if r==self.nr: r=0
if r==(self.nr-1) and c==(self.nc-1): r=0
return self.indx(r,c)
def dec_r(self,ind):
r,c=self.row_col(ind)
r-=1
if r<0: r=self.nr-1
if r==(self.nr-1) and c==(self.nc-1): r=self.nr-2
return self.indx(r,c)
def inc_c(self,ind):
r,c=self.row_col(ind)
c+=1
if c==self.nc: c=0
if r==(self.nr-1) and c==(self.nc-1): c=0
return self.indx(r,c)
def dec_c(self,ind):
r,c=self.row_col(ind)
c-=1
if c<0: c=self.nc-1
if r==(self.nr-1) and c==(self.nc-1): c=self.nc-2
return self.indx(r,c)
def row_col(self,ind):
i=0
for r in range(self.nr):
for c in range(self.nc):
if i==ind: return r,c
i+=1
def indx(self,r,c):
return r*self.nc+c
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