//點
void pointxy(unsigned char x,unsigned char y,unsigned char bitdata)
{  unsigned char a1,p;
   Lcd_CurrentX=x;
   Lcd_CurrentY=y;
   lcdpos();
   p=(Lcd_CurrentY%8)&0x7;
   a1=lcdrd()&Mask1[p];
   if(bitdata>0)
      a1|=Mask2[p];
   lcdwd(a1);
}

//線
void linexy(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char bitdata)
{  unsigned char i;
   unsigned int k;
   if(abs(y1-y0)>abs(x1-x0))
   {  if(y1>y0)
      for(i=y0;i<=y1;i++)
      {  if(x1>x0)
         {  k=x1-x0;
            k*=(i-y0);
            k/=y1-y0;
            pointxy(x0+k,i,bitdata);
         }
         else
         {  k=x0-x1;
            k*=(i-y0);
            k/=y1-y0;
            pointxy(x0-k,i,bitdata);
         }
      }
   else
      for(i=y0;i>=y1;i--)
      {  if(x1>x0)
         {  k=x1-x0;
            k*=(y0-i);
            k/=y0-y1;
            pointxy(x0+k,i,bitdata);
         }
         else
         {  k=x0-x1;
            k*=(y0-i);
            k/=y0-y1;
            pointxy(x0-k,i,bitdata);
         }
      }
   }
   else
   {  if(x1>x0)
      for(i=x0;i<=x1;i++)
      {  if(y1==y0) pointxy(i,y0,bitdata);
         else if(y1>y0)
         {  k=y1-y0;
            k*=(i-x0);
            k/=x1-x0;
            pointxy(i,y0+k,bitdata);
         }
         else
         {  k=y0-y1;
            k*=(i-x0);
            k/=x1-x0;
            pointxy(i,y0-k,bitdata);
         }
      }
   else
      for(i=x0;i>=x1;i--)
      {  if(y1==y0) pointxy(i,y0,bitdata);
         else if(y1>y0)
         {  k=y1-y0;
            k*=(x0-i);
            k/=x0-x1;
            pointxy(i,y0+k,bitdata);
         }
         else
         {  k=y0-y1;
            k*=(x0-i);
            k/=x0-x1;
            pointxy(i,y0-k,bitdata);
         }
      }
   }
}

//矩形
void rect(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char bitdata)
{  linexy(x0,y0,x0,y1,bitdata);
   linexy(x0,y0,x1,y0,bitdata);
   linexy(x0,y1,x1,y1,bitdata);
   linexy(x1,y0,x1,y1,bitdata);
}
void rectfill(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char bitdata)
{
  unsigned char   i;
  for(i=y0;i!=y1;i++)
   {
     linexy(x0,i,x1,i,bitdata);
   }
 
}