#include<reg51.h>
#define uchar unsigned char
#define SNAKE 20 //?????
#define TIME 500000 //?????????
#define SPEED 71 //??????
sbit keyenable=P3^6; //???????
sbit up=P3^3;
sbit down=P3^1;
sbit right=P3^2;
sbit left=P3^4;
uchar x[SNAKE+1];
uchar y[SNAKE+1];
uchar time,n,i,e; //????????????????????????????????
char addx,addy; //λ???????
void delay(char MS){while(MS--);}
bit knock()//?ж????
{
bit k;
k=0;
if(x[1]>7||y[1]>7)
k=1; //??
for(i=2;i<n;i++)
if((x[1]==x[i])&(y[1]==y[i]))
k=1; //????
return k;
}
void turnkey()//?????????λ????
{
if(keyenable)
{
if(left){addy=0;if(addx!=1)addx=-1; else addx=1;}
if(right){addy=0;if(addx!=-1)addx=1; else addx=-1;}
if(up){addx=0;if(addy!=-1)addy=1; else addy=-1;}
if(down){addx=0;if(addy!=1)addy=-1; else addy=1;}
}
}
uchar mux(uchar temp) //???????
{
if(temp==7) return 128;
if(temp==6) return 64;
if(temp==5) return 32;
if(temp==4) return 16;
if(temp==3) return 8;
if(temp==2) return 4;
if(temp==1) return 2;
if(temp==0) return 1;
return 0;
}
void timer0(uchar k)//???????
{
while(k--)
{
for(i=0;i<SNAKE+1;i++)
{
P2=mux(x[i]);
P1=255-mux(y[i]);
turnkey(); //?????????λ????
delay(TIME); //??????
P2=0x00;P1=0xff;
}
}
}
void main(void)
{
e=SPEED;
P0=0x00;P1=0xff;
P2=0x00;P3=0x00;
while(1)
{
for(i=3;i<SNAKE+1;i++) x[i]=100;
for(i=3;i<SNAKE+1;i++) y[i]=100; //?????
x[0]=4;y[0]=4; //????
n=3; //??? n=-1
x[1]=1;y[1]=0; //???
x[2]=0;y[2]=0; //??β1
addx=0;addy=0; //λ?????
while(1){if(keyenable)break;timer0(1);}
while(1)
{
timer0(e);
if(knock()){e=SPEED;break;} //?ж????
if((x[0]==x[1]+addx)&(y[0]==y[1]+addy)) //???????
{
n++;
if(n==SNAKE+1)
{
n=3;e=e-10;
for(i=3;i<SNAKE+1;i++) x[i]=100;
for(i=3;i<SNAKE+1;i++) y[i]=100;
}
x[0]=x[n-2];
y[0]=y[n-2];
}
for(i=n-1;i>1;i--)
{x[i]=x[i-1];y[i]=y[i-1];}
x[1]=x[2]+addx;
y[1]=y[2]+addy; //???
}
}
} |
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